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1
Jonsson, Johan. "Ökadproduktivitet i en manuell produktion : - en fallstudie på AMB Industri AB." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-64759.
Full textAbstract:
Detta examensarbete har studerat hur produktionsplaneringen av en manuell produktion/montering kan bli produktivare. Genom empiriskt material från fallföretaget och insamlade av relevant teori presenteras idéer om hur detta kan göras. Två viktiga slutsatser från detta arbete är att företag bör planera sin manuella produktion/montering längre tid i förväg och därmed möjliggöra för fler förutbestämda planeringsregler, det vill säga vilka produkter som produceras/monteras när. Dessa slutsatser har dragits utifrån aktuell och relevant teori om produktionsplanering av manuell produktion. Fokus i arbetet har dock legat på att testa om ett införande av ett Walking Workers Assembly Line - system (WWAL) i den manuella produktionen påverkar produktiviteten. För att testa hur införandet av WWAL påverkar produktiviteten har det i arbetet gjorts ett experiment i en manuell produktions-/monteringslinje, experimentet har bedrivits i flertalet veckor för att säkerställa resultaten. Resultaten från experimentet visar att införandet av ett WWAL-system påverkade produktiviteten positivt, totalt sett. Däremot visade experimentet att olika delar av den manuella produktionen påverkades på olika sätt, i en del av linjen påverkades produktiviteten positivt med cirka 40 procent och i en annan del negativt med cirka 9 procent. Dessa skillnader kan bland annat förklaras av att det uppstod ett så kallat rabbit chase i den ena delen, men inte i den andra. Vidare visar experimentets resultat att kostnaderna för att införa WWAL var noll, vilket står i strid med aktuell relevant teori. Teorin antyder också att det kan vara svårt att lyckas med WWAL när det gäller komplexa produkter, detta motsäges av experimentet som har gjort på en relativt komplex medicinteknisk produkt. Arbetet kommer också fram till slutsatsen att det kan vara viktigare att införa WWAL än att jobba med Lean till 100 procent, denna slutsats bygger till stor del på att införandet av WWAL var kostnadsfritt.
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Carlisle, Jennifer (Jennifer Nicole). "Tavarua : a mobile telemedicine system using WWAN striping." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40524.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references (p. 69-78).
Tavarua is a platform designed to support mobile telemedicine systems over wireless wide area networks, WWANs. It utilizes network striping and other complementary techniques to send uni-directional near real time video and audio data streams from a imobile node to a stationary location. The key technical challenge is transmitting high-bandwidth, loss-sensitive data over multiple low-bandwidth, lossy channels. We overcome these challenges using dynamic adjustment of the encoding parameters and a novel video encoding technique (grid encoding) that minimizes the impact of packet losses. Using five WWAN interfaces, our system reliably and consistently transmits audio and diagnostic quality video, with median PSNR values that range from 33.716dB to 36.670dB, with near real-time latencies. We present a study of the characteristic behavior of WWANs, and a description of our system architecture based in part on the lessons gleaned from that study. Through a set of experiments where we transmit video and audio data from a moving vehicle we evaluate the system, focusing on consistency, reliability, and the quality of the audio and video streams. These experiments demonstrate that we can transmit high quality video and audio in varying conditions and even in the presence of hardware failures.
by Jennifer Carlisle.
S.M.
3
Owolabi, Emmanuel Olusegun, and Vivien Ibironke Ibiyemi. "COEXISTENCE OF WLAN AND WWAN IN A NOTEBOOK." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3702.
Full textAbstract:
A modern notebook can be equipped with several devices of wireless network access technologies, such as Wireless Local Area Network (WLAN), Wireles Wide Area Network (WWAN), Wireless Personal Area Network (WPAN), and radio based navigation systems, such as GNSS (Global Navigation Satellite System). Future mobile devices will have different radio technologies such as Long Term Evolution (LTE), Wideband Code Division Multiple Access (WCDMA) and WLAN transceivers co-existing on the same module that enables such a device to connect to the different radio technologies. With these radio technologies present in the same device, care must be taken to minimize the interference between them. In this master thesis, we analyze the co-existence of WLAN in the 2.4GHz ISM band, GSM 1800MHz/900MHz, and WCDMA FDD in the 800MHz and 2.1GHz band when they are embedded in a notebook. Different coexistence scenarios have been considered during this work, with focus on realistic power levels for the victim system as well as the aggressor system, and the actual antenna coupling measured for different notebooks. These measurements and the realistic power levels computed are results that will be a factor to consider when designing WLAN/WWAN coexistence module. This work is divided into seven major parts. Chapter 1 is an introduction to coexistence, and a description of the different radio access technologies considered. Chapter 2 is the state of the art. This is a brief discussion of previous related work on coexistence. v “ThesisReport” — 2011/6/22 — 13:43 — page vi — #6 Chapter 3 is the problem statement definition describing the research problems and hypothesis. Chapter 4 describes the measurement plan, devices and parameters considered in developing the test environment and the different measurement scenarios. Chapter 5 presents the measurement setup and procedures undertaken in achieving the measurement. Chapter 6 is the result analysis. Chapter 7 presents conclusion and future work.En modern bärbar dator kan utrustas med flera enheter för trådlös nätverksåtkomst teknik, såsom Wireless Local Area Network (WLAN), Trådlöst Wide Area Network (WWAN), Wireless Personal Area Network (WPAN) och radiobaserade navigationssystem, till exempel GNSS (Global Navigation Satellite System). Framtida mobila enheter kommer har olika radiotekniker som Long Term Evolution (LTE), Wideband Code Division Multiple Access (WCDMA) och WLAN transceivers samexisterande på samma modul som möjliggör en sådan anordning att ansluta till olika radiotekniker. Med dessa radioteknik som finns i samma enhet, man måste vidtas för att minimera störningarna mellan dem. I detta mästare Avhandlingen analyserar vi samexistensen av WLAN i 2,4 GHz ISM band, GSM 1800MHz/900MHz och WCDMA FDD i 800MHz och 2,1 GHz-bandet när de är inbäddade i en anteckningsbok. Olika samexistens scenarier har övervägas under detta arbete, med fokus på realistiska effektnivåer för offret systemet samt angriparen systemet, och det faktiska antennanslutning mäts för olika bärbara datorer. Dessa mätningar och realistiska makten beräknade nivåer resultat som kommer att vara en faktor att beakta när man utformar WLAN / WWAN samexistens modul.
Emmanuel O. Owolabi: +46 73 72 484 53, +234 805 618 2123. Vivien I. Ibiyemi: +46 73 65 943 76.
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Kou, Tzuyung Doug. "Watchful Waiting Active Surveillance in Prostate Cancer Patients a Population-Based Study Using the SEER-Medicare Linked Database." Cleveland, Ohio : Case Western Reserve University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1207309899.
Full textAbstract:
Thesis (Ph.D.)--Case Western Reserve University, 2008Title from PDF (viewed on 26 May 2009) Includes abstract Department of Epidemiology and Biostatistics Includes bibliographical references [and appendices] Available online via the OhioLINK ETD Center
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Franceschinelli, Daniella Arruda. "Estudo comparativo dos aspectos de segurança em redes WWAN, WLAN e WPAN." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276381.
Full textAbstract:
Orientador : Ricardo DahabDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação
Made available in DSpace on 2018-08-03T22:41:04Z (GMT). No. of bitstreams: 1 Franceschinelli_DaniellaArruda_M.pdf: 3740509 bytes, checksum: ea2dbca5dbed86af342ac84113f5ae52 (MD5) Previous issue date: 2003
Resumo: o surgimento e as evoluções das tecnologias wireless proporcionaram maior interesse pela mobilidade, que contribuíram no avanço da comunicação móvel. A crescente utilização das redes sem fios, por um lado, gerou novos negócios nos serviços de comunicação pessoal, mas por outro, trouxe novos problemas relacionados à segurança, tais como a maior exposição dos meios de transmissão e maior complexidade nos processos de autenticação. Este trabalho apresenta inicialmente uma visão geral dos sistemas de redes sem fios GSM, 802.11 e Bluetooth, destacando suas arquiteturas, componentes, funcionalidades e beneficios. Esta apresentação inicial serve como base para discutir os aspectos de segurança nessas redes sem fios e compará-Ios com outras tecnologias existentes no mercado, especialmente quanto aos requisitos de autenticação, confidencialidade, disponibilidade e privacidade
Abstract: The constant evolution 01 wireless technologies have prompted an increasing interest lor mobile computing in general, which in turn have contributed to advancements in mobile communication. If, on one side, wireless networks opened the possibilities for personal service businesses, they also exposed a whole new range 01 serious security issues such as greater exposure 01 the communication media and more complex, and thus more error prone, authentication procedures. This work presents, initially, a broad overview of wireless network systems, specifically GSM, 802.11 and Bluetooth, highlighting its architectures, components, functionalities and positive aspects. This overview is then used as a basis for discussing their security aspects and lor comparing them with other technologies available in the market, specially with regard to authentication, confidentiality and availability
Mestrado
Engenharia de Computação
Mestre em Computação
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Westberg, Jonas. "Faraday modulation spectroscopy : Theoretical description and experimental realization for detection of nitric oxide." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-68649.
Full textAbstract:
Faraday modulation spectroscopy (FAMOS) is a laser-based spectroscopic dispersion technique for detection of paramagnetic molecules in gas phase. This thesis presents both a new theoretical description of FAMOS and experimental results from the ultra-violet (UV) as well as the mid-infrared (MIR) regions. The theoretical description, which is given in terms of the integrated linestrength and Fourier coefficients of modulated dispersion and absorption lineshape functions, facilitates the description and the use of the technique considerably. It serves as an extension to the existing FAMOS model that thereby incorporates also the effects of lineshape asymmetries primarily originating from polarization imperfections. It is shown how the Fourier coefficients of modulated Lorentzian lineshape functions, applicable to the case with fully collisionally broadened transitions, can be expressed in terms of analytical functions. For the cases where also Doppler broadening needs to be included, resulting in lineshapes of Voigt type, the lineshape functions can be swiftly evaluated (orders of magnitude faster than previous procedures) by a newly developed method for rapid calculation of modulated Voigt lineshapes (the WWA-method). All this makes real-time curve fitting to FAMOS spectra feasible. Two experimental configurations for sensitive detection of nitric oxide (NO) by the FAMOS technique are considered and their optimum conditions are determined. The two configurations target transitions originating from the overlapping Q22(21=2) and QR12(21=2) transitions in the ultra-violet (UV) region (227nm) and the Q3=2(3=2)-transition in the fundamental rotational-vibrational band in the mid-infrared (MIR) region (5.33 µm). It is shown that the implementations of FAMOS in the UV- and MIR-region can provide detection limits in the low ppb range, which opens up the possibility for applications where high detection sensitivities of NO is required.
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PÉREZ, ROJAS ERIKA. "MEMORIA DE EXPERIENCIA LABORAL EN LA EMPRESA WWPL MÉXICO S.A DE C.V EN LAS INSTALACIONES DEL ISEM HOSPITAL GENERAL “DR. FERNANDO QUIROZ GUTIERREZ” VALLE DE CHALCO." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2018. http://hdl.handle.net/20.500.11799/94687.
Full textAbstract:
El Licenciado en Nutrición es un profesional capaz de brindar atención
nutriológica a individuos sanos, en riesgo o enfermos, así como a grupos de los
diferentes sectores de la sociedad; de administrar servicios y programas de
alimentación y nutrición; de proponer, innovar y mejorar la calidad nutrimental y
sanitaria de productos alimenticios.
Capaz de integrar, generar y aplicar conocimientos, habilidades y actitudes que
permiten su desempeño en los campos profesionales básicos: nutrición clínica,
nutrición poblacional, servicios de alimentos, tecnología alimentaria y otros
campos transversales como: investigación, educación, administración y
consultoría aplicando métodos, técnicas y tecnologías propias de la nutriología
y ciencias afines.
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Stenbom, Håkan. "Optimization of Remote ServiceSolution for large installations : Wireless LAN and WAN for ABB Robotics." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12083.
Full textAbstract:
This report describes a thesis work carried out at ABB Robotics in Västerås. The objective of this thesis is to find technologies and equipments for wireless data transfer suitable for the present and future needs of ABB Robotics Remote Service for large installations in industrial environments. ABB Robotics has a Remote Service solution to securely gather information from robots, manage alarms and potentially execute remote commands by ABB Robotics. This solution consists of an intelligent Service Box plugged to the robot. This Service Box is also connected through GPRS or directly through Internet to create a secure VPN connection to a central Remote Service server. The Remote Service Box is well suited for small customers with 1-10 robots with plug and play installation, but show limitations at a larger scale of deployment due to equipment costs, network and installation complexity. A new Service Box is planned that will accommodate future added functionality to Remote Service. This Service Box will require new network solutions as the added functionality is depending on a higher bandwidth than the GPRS networks can deliver. I have surveyed most existing wireless networking technologies and analyzed them withrespect to function, cost and availability which provide a knowledge base that makes it possible to find suitable solutions. When the most suitable technologies are identified a survey was performed to find equipments that meet the requirements at the lowest cost. A new hierarchical network topology is proposed that will lead to cost savings by replacing multiple WAN connections in the present solution with a network switch and single WAN connection to Internet. As manufacturers of network equipments for industrial environments are relatively few, alternative solutions were also investigated in order to find the most cost effective solutions. The proposed network topology together with the data from the surveys lead to recommendations on using Wi-Fi in the wireless LAN and a 3G mobile network for the WAN connection to Internet, as well as recommendations on alternative network equipments that potentially can lead to substantial savings when the new network solutions are implemented.
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Chen, Chun-ta, and 陳俊達. "Planar Antenna Design for LTE/WWAN Application." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58200768212190324619.
Full textAbstract:
碩士國立中央大學
通訊工程學系在職專班
101
In this thesis, a planar miniaturized antenna(83mm x 10mm) which covered eight bands of Long-term Evolution(LTE700 / 2300 / 2500) and Wireless Wide Area Network(GSM850 / GSM900 / DCS1800 / PCS1900 / UMTS2100) for embedded application in the Laptop and Tablet PCs is presented. Nowadays, the trend of Laptop and Tablet PC products design are slim and light-based, therefore, the proposed antenna in this thesis is base on a planar antenna structure and using a gap-coupled structure in the loop antenna to achieve the miniaturization antenna demand. The proposed antenna can be realized by mature printed circuit board technology easily since its structure is very simple, and do not need additional assembly and processing which means the antenna characteristics have a high degree of consistency and production cost advantages for mass production. For the low-band portion(LTE700 / GSM850 / GSM900) of antenna, the proposed antenna was using a gap-coupled structure for increasing antenna bandwidth and two parasitic strips for tuning the antenna matching as well. For the high-band portion(DCS1800 / PCS1900 / UMTS2100 / LTE2300 / LTE2500) of antenna, the proposed antenna was added two parasitic strips for tuning the high-band matching to achieve up to 1 GHz bandwidth demand. Detailed antenna designs and measured results are introduced in this thesis.
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HSIAO, YU-NI, and 蕭優霓. "Designs of LTE/WWAN antennas for smartphones." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xeq7yf.
Full text
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Lee, Li-chun, and 李麗君. "Internal Printed WWAN Antennas for Laptop Computer." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/z8e7m3.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
97
Two novel internal WWAN antennas having multi-band operation capability and suitable to be embedded in the laptop computers are proposed. The first antenna is a penta-band printed monopole slot antenna, which can cover GSM850/900/1800/1900/UMTS operation. The second antenna is a penta-band printed dual-loop antenna. The antenna can cover GSM850/900/1800/1900/UMTS operation and occupies a small size. The effects of the environment and the user’s hand on the internal laptop computer antenna are also studied. Take the first antenna as an example; the obtained results show that the effects of the internal environment of the laptop computer are mostly on the antenna’s impedance matching, which however can be improved by adjusting the parameters of the antenna. On the other hand, since the user’s hands are lossy materials, a decrease in the antenna’s radiation efficiency is observed when the user’s hand is in the vicinity of the internal antenna.
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Kuo, Che-Yang, and 郭哲仰. "Compact Slot Antennas for LTE/WWAN Operations." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/38440251845695202827.
Full textAbstract:
碩士國立高雄師範大學
光電與通訊工程學系
99
Two novel designs of open slot antenna for application in LTE/WWAN operations are presented in this thesis. The first proposed antenna is composed of three open slots and a dual-branch microstrip feedline. Through proper selection of the parameters of the dual-branch microstrip feedline, multiple resonant modes for the three open slots can be effectively excited, and two wide operating bandwidths are abtained for the antenna. The lower band covers from 698~979 MHz for LTE700/GSM850/900 operation, and the upper band covers from 1706~2209 MHz for GSM1800/1900/UMTS operation. The second proposed antenna consists of a T-like open slot and a microstrip feedline with a tuning patch. The proposed antenna utilizes two paths of the T-like open slot to generate multiple resonant modes, which is helpful to achieve the multi-band operation. By properly adjusting the location and size of the tuning patch, the proposed antenna can operate at two wide bands to cover the required LTE/WWAN bandwidths (704~960 and 1710~2690 MHz).
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Cheng, Hsu-yang, and 程旭煬. "A Compact Antenna for LTE/WWAN Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/70049027884967544736.
Full textAbstract:
碩士國立臺南大學
電機工程學系碩士班
100
In this thesis, an internal mobile antenna operating in LTE700/LTE2300/LTE2500 and WWAN (GSM850/ GSM900/ GSM1800/ GSM1900/ UMTS) is presented. The proposed monopole antenna ground portion is to be grounded to the system ground plane of the device for practical applications. For the requirement of multi-band, it adds parasitic folded branches to increase resonating current paths. The size of the proposed PIFA and the ground plane are 38 mm × 22 mm × 5.8mm and 43 mm × 22 mm. Moreover, the antenna has a nearly omni-directional radiation pattern and a reasonable peak gain of 1.7dBi to 4.2dBi by the simulation results. To attain the wide bandwidth of low frequency from 830 MHz frequency band can be effectively integrated in PIFA antenna. By embedding a chip inductor into the PIFA antenna, whose resonant mode is generated between the circuit and the monopole circuit. By using the reactance feed, the monopole antenna can be well incorporated into the antenna structure. The proposed antenna was fabricated on a FR4 substrate, the overall size of the antenna is 75 × 22 × 5.8 mm3. The measured results of return loss and the radiation patterns of each frequency bands were presented and appeared to have good agreement with the simulation results.
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I-WeiTseng and 曾義偉. "“WPAN/WLAN/WMAN/WWAN”Antenna Design for Notebook." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/79380997496776629030.
Full textAbstract:
碩士國立成功大學
電機工程學系專班
98
In this thesis, a variety of WPAN/WALN/WMAN/WWAN antennas for the thin-type notebooks have been proposed, These antennas contain WLAN (Wireless Local Area Network), WWAN (Wireless wide Area Network) and UWB (Ultra-Wideband) antenna design; and all of these antennas are different with the general traditional designs by the three dimensional PIFA (Planar Inverted F Antenna) for notebook, in this thesis, we use antenna can be applied to the thin-type notebook in the future at the same time, the price will be lower.
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Huang, Yuan-Jie, and 黃沅絜. "LTE/WWAN Antenna Design for Portable Devices Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/35046312541866614075.
Full textAbstract:
碩士國立中央大學
電機工程研究所碩士在職專班
100
In the thesis, internal WWAN (Wireless Wide Area Network) and LTE (Long Term Evolution) antennas having eight-band operation capability and suitable to be embedded in the portable devices are proposed. First, a modified structure of monopole antenna is used to produce two resonance frequencies at 0.821 GHz and 1.762 GHz, which are able to contain tri-band GSM850/GSM900/DCS1800 operation. Then, the half-wavelength parasitic path adjacent to the monopole antenna results resonance frequency at 2.352 GHz, which coverage PCS1900/UMTS2100/LTE2300/LTE2500 operation. Finally, by using a plate (High 3mm) and printed circuit board (PCB) combination of antenna, it improves impedance bandwidth and covers the LTE700 band. The monopole antenna of a simple structure and being easy to construct with low cost, is presented. It can cover eight bands, including three LTE bands of LTE/700/2300/2500 and five WWAN bands of GSM850/900/DCS1800/PCS1900/UMTS operation, and occupy a compact volume of 60 × 17 × 3 mm3. Detailed antenna designs and experimental results are presented and discussed.
19
Hong, yan-ming, and 洪彥銘. "Antenna Design LTE/WWAN of Mobile Handset Applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/67739132491839139328.
Full textAbstract:
碩士國立中央大學
通訊工程學系在職專班
102
. For the high-band portion(DCS1800 / PCS1900 / UMTS2100 / LTE2300 / LTE2500) of antenna, the proposed antenna was added trace attached on low band for tuning the high-band matching to achieve up to 1 GHz bandwidth demand. Detailed antenna designs and measured results are introduced in this thesis. This thesis mainly studies the long term evolution (LTE700/2300/2500) and wireless wideband network (GSM850/GSM900/DCS1800/PCS1900/UMTS2100) of handheld devices. Referring the size of mobile phone in the market, defining the overall space at 55mm x120mm, and further considering the workability of assembly in real use, the antenna size is defined at 55mm x 10mm x 4.5mm in this design. Due to the market trend of the mobile phone, the size is preferred to be light and thin. The design of the film antenna in this thesis is based on the printed circuit FPCB stick on the plastic material for the application of the mature skill and capacity of producing printed circuit FPCB. In order to complete the design of combination of the antenna and plastic from the huge market demand, this kind of antenna make itself high yield rate and quality consistence. In this antenna design at low frequencies (LTE700/GSM850/GSM900), it is to useλ/4 monopole which connected to the ground to generate parasitic trace; a wideband at lower frequencies. For high frequencies (DCS1800/PCS1900/UMTS2100/ LTE2300/LTE2500), it is to add partial current at 2 traces of low frequencies for the purpose of increasing 1 GHz which is required at high frequencies. Antenna design, simulation analysis, and practical test data will be will be given in each chapter.
20
Huang, Yong-Hao, and 黃永豪. "Design of WWAN Antenna for Laptop Computer Applications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69834922647468181191.
Full textAbstract:
碩士國立高雄應用科技大學
光電與通訊研究所
99
As technology advances and wireless network popularity, antenna design have to bear with the pace of the times. This study mainly designs the wireless wide area network (WWAN) antenna for Laptop Computer and tablet PCs, improving the external antenna design in USB dongle. The WWAN antenna can built in the mobile communications device with SIM card, then it could be surf the internet at anytime. In this thesis, three different structures of antenna design were proposed, which were a compact and simple structure. The proposed antenna operate at GSM 850/900, DCS/PCS/UMTS, WLAN and WiMAX bands, which have good antenna gain and radiation efficiency. All the proposed antenna are suitable for embedding in the Laptop computer.
21
Wei, Wan-Jhu, and 魏婉竹. "LTE/WWAN Planar Loop Antenna for Tablet Computer." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/19724271080865936572.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
99
In this thesis, an LTE/WWAN planar loop antenna for tablet computer with a compact size of 75 × 12 mm2 is presented. The planar loop antenna comprises a printed loop strip and a patch monopole encircled therein. By embedding a printed distributed inductor in the loop strip, whose effect is similar to a chip inductor, a parallel resonant mode is generated owing to the contributed inductance of the distributed inductor and the contributed capacitance of the coupling between the loop strip and the patch monopole. The parallel resonant mode leads to increase input resistance of the 0.5-wavelength loop mode at the high-frequency tail and a zero reactance nearby the original resonance of the 0.5-wavelength loop mode, thereby resulting in a dual-resonance excitation to greatly enhance the bandwidth of the antenna’s lower band for the LTE700/GSM850/900 operation. In addition, the patch monopole, which performs not only as a coupling feed but also an efficient radiator, provides a 0.25-wavelength resonant mode to combine with a higher-order resonant mode contributed by the printed loop strip to form the antenna’s upper band to cover the GSM1800/1900/UMTS/LTE2300/2500 operation. Further, the required distance between the antenna and the testing flat phantom to meet the 1-g body SAR requirement of 1.6 W/kg is discussed. A comparison of the body SAR value of the planar loop antenna and the bent loop antenna is also discussed.
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Chen, Meng-Ting, and 陳孟廷. "LTE/WWAN Loop Antennas for Tablet Communication Devices." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4fe83g.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
102
The techniques for bandwidth enhancement of loop antennas in the tablet communication devices are proposed. For LTE/WWAN operation and the demand of small-size and low-profile antennas, the proposed techniques widen the bandwidth of the lower band with very slight or almost no effects on the wide bandwidth of the higher band. The first proposed antenna is formed by integrating an inductive coupled branch strip to a loop antenna. The integration of the two structures makes the proposed antenna cover two wide operating bands with an occupied area of 10 ∗ 34.5 mm2. In the second proposed antenna, based on using a high-pass matching circuit to cause an additional mode generated in the lower band, the proposed antenna can meet the bandwidth requirement of LTE/WWAN operations with a size of 10 ∗ 30 ∗ 3 mm3. In order to achieve a lower profile of the antenna, a couple-fed loop antenna is applied in the third proposed design. By adding a high-pass matching circuit, an additional resonance can be created to widen the bandwidth of the lower band. The proposed antenna can cover 698~960 MHz and 1710~2690 MHz bands for a lower-profile antenna with a size of 8 ∗ 40 ∗ 3 mm3. Owing to loop antenna structure and the used matching circuits, the three proposed antennas can in general independently widen the bandwidth of the lower band without affecting the high-band bandwidth. Because of the small size and low profile, the proposed antennas are very suitable for narrow-frame communication devices. Details of the matching circuit techniques and their operating principle are analyzed. The proposed techniques provide a method of bandwidth enhancement without increasing the antenna volume occupied for achieving the LTE/WWAN operation in the 698~960/1710~2690 MHz bands.
23
Tian, Qi-Hui, and 田麒暉. "Broadband Mobile Communication Antennas for LTE/WWAN Applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8mfsre.
Full textAbstract:
碩士國立高雄應用科技大學
電子工程系碩士班
103
In this thesis, three kinds of low profile and broadband planar monopole antennas are proposed for application to the LTE700/2300/2500 bands and wireless wide area network (WWAN) operation in the GSM850/900/DCS1800/PCS1900/UMTS bands. The first design uses a radiated monopole and extended strip line from the ground plane to produce a multimode operation for mobile phone application. The second design combines the modified monopole with shorted parasitic element to form a radiating structure. The third design utilizes the coupling effect between the modified G-shaped monopole and shorted meander to achieve a multiband operation and compact size. Above both designs are suitable for tablet computer application. The measured results show that the proposed antennas can apply in the LTE/WWAN bands.
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謝維庭. "Multiband Antenna for WWAN/LTE Mobile Phone Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fzfmb3.
Full textAbstract:
碩士逢甲大學
通訊工程學系
106
This thesis focuses on multi-band antennas for handheld devices including smart phones and tablet computer. There are three antennas proposed in this research. The main structures of the antennas are monopole antenna and slot antenna. The first antenna is a multi-band antenna for smart phone. It can provide LTE 700/2300/2500 (698~787, 2300~2400, 2500~2690 MHz), GSM 850/900/1800/1900 (824~894, 890~960, 1710~1880, 1850~1990 MHz), UMTS 2100 (1920~2170 MHz) and WLAN 2400 (2400~2488 MHz). The antenna consists of three branches monopole antenna and a shorting strip with a matching capacitor. In order to reduce the overall antenna size, a 3-dimensional structure is designed. The volume of the proposed antenna is 70×8×3
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Cho, Liang, and 卓良. "Reconfigurable Antenna Design for LTE and WWAN Applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/15460980345462790681.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
103
This thesis contains two parts. First part is to investigate switched-beam antennas for the indoor base station(femtocell). By using those antennas, various functions in femtocell applications can be achieved, for instance, smart home control and indoor position tracking. Considering the overall size and functionality, a design of the reconfigurable circuit controlling four antennas to turn on or off is proposed. The antenna system consists of the circuits and cross-dipoles. This system has three kinds of patterns, including directional, omni-directional and bi-directional. Antenna radiation efficiency is above 50% in those cases. The second part is to design LTE and WWAN frequency reconfigurable narrow frame antenna for a tablet. The size of the antenna is 40 x 5 x 5 mm3. By employing a parasitic element extended from the ground plane and a tunable pin diode, an operation band can be achieved in the lower band. The higher band is excited from meander lines and parasitic elements. With measurements, good matching and radiation performance characteristics are validated in seven-band WWAN and LTE.
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Wu, Chao-hsu, and 吳朝旭. "LTE/WWAN Antenna Design for Laptop Computer Applications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/28715824458525460429.
Full textAbstract:
碩士國立中央大學
電機工程研究所碩士在職專班
99
In this thesis, Internal WWAN (Wireless Wide Area Network) and LTE (Long Term Evolution) antennas having eight-band operation capability and suitable to be embedded in the laptop computers are proposed. At first, a modified monopole antenna is uesd to produce four resonance frequencies 0.94GHz、1.67GHz、2.035GHz and 2.41GHz. The penta-band DCS1800/PCS1900/UMTS/LTE2300/LTE2500 operation is covered in this design. Then, with the monopole antenna and a quarter-wavelength parasitic path, we can have dual-resonance in the low band and improve impedance bandwidth, resulting a broadband coverage for the tri-band LTE700/GSM850/900 operation. Finally, a novel metal-plate and printed circuit board (PCB) combo of WWAN antenna, having a simple structure and being easy to construct with low cost, is presented. It can cover eight bands, including three LTE bands of LTE/700/2300/2500 and five WWAN bands of GSM850/900/DCS1800/PCS1900/UMTS operation, and occupy a compact volume of 65 × 14 × 2.3 mm3. Detailed antenna designs and experimental results are presented and discussed.
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WU, PO-WEI, and 吳柏緯. "LTE/WWAN Open Slot Antennas for Laptop Computers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/91406574604639517249.
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Liu, IHan, and 劉倚函. "Isolation Design of MIMO Antenna for LTE/WWAN Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/08918823730089212362.
Full textAbstract:
碩士正修科技大學
電子工程研究所
100
This thesis presents novel techniques for isolation enhancement between two closely packed antennas. The first design operates in Long Term Evolution (LTE) 2500 MHz. The element of the proposed Multiple-Input Multiple-Output (MIMO) antenna consists of a polygonal loop and an L-shaped ground plane. Due to the two coupling-currents, which are caused by radiation emission and conduction emission and which are 180° out of phase, field cancellation clearly reduces mutual coupling between the closely packed antenna elements. The second design mainly consists of an inverted L-shaped metal microstrip line and a branch ground. This design operated in bands of LTE700/WWAN quad-band. The extended portion of antenna ground lengthens the resonance path at lower frequency,which introduces a compact antenna structure and increases the space between two closed antennas. The simulative study and experimental study are carried out to verify the performances of the proposed MIMO antennas.
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Liu, Ying-chieh, and 劉穎潔. "LTE/WWAN and LTE MIMO Antennas for Ultrabook Computers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/99460511261335588972.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
100
In this thesis, WWAN/LTE and LTE MIMO antennas for ultrabook computers are presented. The MIMO antenna system comprises an eight-band LTE/WWAN antenna and a three-band LTE antenna. The bandwidth of the eight-band LTE/WWAN antenna is enhanced by using an embedded parallel resonant circuit, which can result in dual-resonance excitation of the lowest resonant mode of the antenna. The bandwidth of the antenna’s lower band can hence cover the LTE700/GSM850/900 operation. A design technique of improving the isolation of the MIMO antenna system is also presented. The isolation enhancement is obtained by embedding a 0.5-wavelength slot in the conductive supporting plate of the upper cover of the ultrabook computer. The embedded slot can attract the excited surface currents in the conductive supporting plate and decrease the coupling between the MIMO antennas through the coupling of the surface currents. The isolation between the MIMO antennas can hence be enhanced. Moreover, this technique will not lead to decreased radiation efficiency and impedance matching of the MIMO antennas, which is attractive for practical applications.
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CHEN, SHU-CHUAN, and 陳淑娟. "LTE/WWAN Ground Antenna for Slim Mobile Communication Devices." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/01452552987594993068.
Full textAbstract:
博士國立中山大學
電機工程學系研究所
100
In this dissertation, novel printed multiband antennas for slim mobile communication devices are presented. The design techniques on achieving decreased antenna size and enhanced operating bandwidth in different shaped system ground planes with the antennas printed thereon are proposed. At first, a WWAN antenna integrated with a U-shaped ground plane is presented. Two techniques are applied to achieve WWAN operation with a small antenna size. The first technique is to embed load a proper chip inductor at a proper position in the shorted strip monopole of the antenna. The second one is to use a band-stop matching circuit disposed on the main circuit board of the handset. For the second and third antenna designs, owing to the C-shaped ground plane, much enhanced operating bandwidth for their lower band can be obtained. The second antenna design can cover the LTE/WWAN eight-band operation without increasing the size of the antenna by using a reconfigurable circuit element. The third antenna design integrated with a battery element and a metal midplate for practical application to help reduce the thickness and enhance the robustness of handset. The antenna can cover seven-band LTE/WWAN operation with good radiation characteristics and occupy a small size of 35 x 8 mm2. Finally, the simulated SAR and HAC results are analyzed for bio-compatibility consideration.
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Hsieh, Yi-ting, and 謝沂廷. "LTE/WWAN Ground Antenna for Slim Handheld Communication Devices." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/62247081697887238230.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
101
In this thesis, a ground antenna is presented for applications in slim handheld communication devices to cover LTE/WWAN operation. The antenna has a very small size, yet can provide two wide operating bands with the aid of a wideband matching circuit. By combining the design concept of switchable or reconfigurable antennas, it is promising for the proposed antenna to have two feeds connected to respective switch elements (for example, a PIN diode) to independently control the antenna’s low-band and high-band operation. One embodiment of the proposed antenna can cover the GSM1800/1900/UMTS/LTE2300/2500 (1710~2690 MHz) bands when operated in the high band, and can cover the GSM850/900 (824 ~960 MHz) bands when operated in the low band. The antenna occupies a size of 10 x 20 mm2 only. Such a small antenna can be considered to combine with the device system ground plane to form an asymmetric dipole structure, and hence can be treated as a ground antenna structure. In addition to analyze the antenna structure and the obtained radiation of the antenna characteristics, an antenna array formed using the proposed antenna is also tested. The SAR and HAC of near-field effects of the antenna on human body are also studied.
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Chang, Yu-wei, and 張育維. "Internal LTE/WWAN Handset Antenna Integrated with USB Connector." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/07674763734237738315.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
99
An internal eight-band LTE/WWAN handset antenna integrated with a USB connector is presented. The proposed antenna comprises an antenna ground which faces a protruded ground extended from the main ground of the handset to accommodate a USB connector. The antenna ground is used as a shorting portion to short-circuit the antenna to ground such that the coupling between the antenna ground and the protruded ground is effectively suppressed. In this case, the proposed antenna can be integrated with a USB connector mounted on the protruded ground, leading to compact integration of the antenna inside the handset. Good radiation characteristics of the antenna are also obtained, and the proposed antenna occupies 60 × 12 × 4.8 mm3 (about 3.4 cm3) only. Effects of the user’s head and hand on the proposed antenna are studied, and the simulated SAR and HAC results are also analyzed in this thesis.
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Chen, Yi-Xiu, and 陳貽修. "LTE/WWAN Antennas for Tablet and Laptop Computer Applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/12390368082966032897.
Full textAbstract:
碩士國立高雄師範大學
光電與通訊工程學系
102
ABSTRACT In this thesis, two small-size LTE/WWAN antennas are proposed for laptop and tablet computer applications, respectively. The first proposed antenna is embedded in laptop computers and has a low-profile characteristic whose height has only 8 mm. An active switch chip is used to control the lower band of the antenna, and thereby the demanding LTE/WWAN operating bandwidths (704 ~ 960 MHz, 1710 ~ 2690 MHz) can be achieved. The second proposed antenna is applied to tablet computers, and it is composed of a monopole antenna and two feeds. The two feeds are used to excite the operating modes of the lower and higher bands, respectively. By adding a matching circuit to each feed, two wide bandwidths for the lower and higher bands can be achieved, and cover the required LTE/WWAN eight-band operating bandwidths.
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李哲宇. "Compact Size Uniplanar Antennas Design for LTE/WWAN Operation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/5q47e9.
Full textAbstract:
碩士逢甲大學
電機工程學系
102
This thesis focuses on compact size uniplanar antennas design for LTE/WWAN operation. In this thesis, two compact size uniplanar antenna structures were proposed, and the main design principle for these two proposed antennas was the use of coupling feed mechanism. Because of their compact size characteristic, the two proposed antennas can be inserted into any mobile devices with limited spaces. The first antenna design was composed of three structures, namely, feeding strip, parasitic shorted strip, and LC matching strip. Here, five resonant modes were excited via the feeding strip and parasitic shorted strip, and good impedance matching was achieved by tuning the printed LC matching strip. The overall size of the first proposed antenna was 68 × 12 × 0.8 mm3. Further investigation has also shown that adjusting the length and width of the first proposed antenna by ± 20% do not affect all operating bands of interest. The second antenna design was composed of a T-shaped feeding strip, parasitic shorted strip,and a step tuning stub. Compared with the first proposed antenna design, this second proposed antenna was designed to rely on only four resonant modes to cover the entire LTE/WWAN operation band, and it has also demonstrated a smaller size of 50 × 15 × 0.8 mm3. . Further investigation has shown that adjusting the length and width of the second proposed antenna by ± 30% do not affect all operating bands of interest.
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Hsu, Hung-Hsun, and 許弘勳. "Design of MIMO Antenna LTE/WWAN/WLAN Mobile Communication." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6hbr56.
Full textAbstract:
碩士國立臺北科技大學
電腦與通訊研究所
102
A simple multiple-input-multiple-output antenna for Long-term evolution / Wireless wide area network / Wireless local area network operation in mobile communication devices is proposed. The proposed antenna performs four resonance modes covering nine bands of wireless standards including GSM850/GSM900/GSM1800/GSM1900/UMTS/LTE2300/802.11n/LTE2500/802.11ac. In geometry, the antenna simple consists of a ㄈ-shaped monopole, two U-shaped, strip structures and a L-shaped structure. The ㄈ-shaped monopole exhibits the resonance frequencies at 0.8 GHz. With good impedance matching in medium band by added U-shaped and strip to the antenna. Adding L-shaped to the antenna can improve the impedance matching in higher band. In addition, isolation of MIMO antenna is improved by use slot to change current distribution. The isolation improved 18% in low band and 14.7% in middle band, low envelope correlation coefficient ＜0.1. The experimental results are verified by simulation. The antenna exhibits simple structure, easy production, low-cost for the applications in LTE/WWAN/WLAN communication.
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HUANG, CHIH-CHIA, and 黃智佳. "Eight-Band LTE/WWAN Antenna Integrated with Ground Plane." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/ur3tdu.
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LI, CHENG-YEN, and 李政諺. "LTE/WWAN antenna design for metal-casing smartphone application." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a43v95.
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LI, YEN-TING, and 李彥廷. "Design of small LTE/WWAN antenna with matching circuit." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/77560072135729775987.
Full textAbstract:
碩士國立高雄師範大學
光電與通訊工程學系
105
In this thesis, two designs of small LTE/WWAN antenna with matching circuit are presented. The first proposed antenna is composed of two inverted-L antenna. One inverted-L antenna operated at high frequencies, and used coupling feed to stimulate other one to operate at low frequencies. By using a high-pass π-type matching circuit integrated within the antenna, the bandwidth of the lower and higher band for the proposed antenna can be enhanced. The second proposed antenna comprises of a dualbranch bent monopole. A high-pass π-type matching circuit integrated within the antenna is also used to broaden the bandwidth of the lower and higher band. Two proposed antennas can generate two wideband for the WWAN/LTE operation to cover the LTE700/GSM850/900 bands (698 ~ 960 MHz) and GSM1800/1900/UMTS/LTE2300/2500 bands (1710 ~ 2690 MHz). Both of the proposed antennas has advantages of a small size and a simple structure.
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Chen, Ya-Chun, and 陳雅純. "LTE/WWAN Slot Antenna Designs for Applications in Laptop Computers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/96545679760239921395.
Full textAbstract:
碩士高雄師範大學
光電與通訊工程學系
98
Two compact antenna designs for applications in LTE/WWAN wireless communication systems are presented in this thesis. The first proposed antenna is composed of a rectangular open slot and a rectangular tuning patch. The open slot is operated at a quarter-wavelength resonant structure and has the advantage of antenna size reduction, compared to the conventional half-wavelength slot antenna. By properly choosing the size of the open slot and adjusting the location and size of the tuning patch, the proposed antenna can operate in the 630~990 MHz and 1490~2900 MHz frequency ranges and covers the required LTE/WWAN bandwidths. The second antenna is proposed for providing a very wide impedance wideband, and consists of a semi-elliptic open slot, a semi-elliptic tuning patch, and a slit. With the proper dimensions of the open slot, the tuning patch, and the slit chosen, the impedance bandwidth for the proposed second antenna reaches about 638~2490 MHz (about 114%) and almost covers the LTE and WWAN operating bandwidths.
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Liao, Chi-yu, and 廖啟佑. "Multiband Monopole Antenna Designs for LTE / WWAN Smart Mobile Devices." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/23445142893031832700.
Full textAbstract:
碩士國立中央大學
通訊工程學系在職專班
101
In this thesis we will propose the design of the monopole antenna for the applications of the wireless WAN and long-term evolution of eight frequency operation band. The proposed antenna is also suitable for embedded in smart mobile devices. First, a modified structure of monopole antenna results in the resonance frequencies of 0.92 GHz and 1.8 GHz. Then, good impedance matching in medium band is obtained by adding a tapered strip to the antenna. Also, adding a extra path to the antenna creates resonance at 2.64 GHz. It can improve the impedance matching in medium and high frequency band. Finally, we can use the parallel inductance、series capacitor to adjust impedance matching at the low frequencies. The proposed multi-band monopole antenna has achieved good impedance matching in the low, medium and high frequency bands. The multi-band monopole antenna can be operated in the eight operating frequency bands of the LTE700, LTE2300, LTE2500, GSM800, GSM900, DCS1800, PCS1900 and UMTS. In conclusion, we have designed a antenna that is of simple structure, easy production, low-cost and can be applied to of LTE/WWAN. The antenna size is only 19 × 40 × 0.8 mm3 . The details of the antenna design methods and experimental data will be described and discuss in this thesis.
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Chang, Hsuan-Jui, and 張軒瑞. "LTE/WWAN Low-profile Planar Antenna for Tablet Communication Device." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/05739210336682972285.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
101
In this thesis, two low-profile planar LTE/WWAN antennas for tablet communication devices are presented. The first antenna is disposed around a ground corner, and the antenna size is 57.5 x 6.5 x 0.8 mm3 only. By embedding an opening in a loop strip, it can be transformed into a dual-branch monopole antenna. By aided with a matching circuit, the antenna can provide two wide operation bands with a planar, low-profile structure, making it promising for applications in modern slim tablet communication devices with a narrow frame. The proposed antenna applied to form a two-antenna array is also studied. A second low-profile planar antenna to be employed along an edge of the tablet device system ground plane is also presented. The second antenna is also a loop strip having an opening, sized 55 x 10 x 0.8 mm3. In the second structure, the opening and the feeding point of the antenna are arranged to be at the same edge of loop strip, which allows the antenna to have two wide operating bands with a low-profile structure because the proposed structure can decrease the coupling between the antenna and nearby ground plane. Both the two antennas in this thesis can cover the 704~960 and 1710~2690 MHz bands for the LTE/WWAN operation.
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Weng, Tseng-Wei, and 翁增蔚. "Triple-Wideband LTE/WWAN Combined-type Antennas for Tablet Devices." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/fs935s.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
102
In this thesis, novel combined-type antennas having three wide operating bands (698~960 MHz, 1710~2690 MHz, and 3400~3800 MHz) to cover the LTE/WWAN operation for tablet devices are presented. In the first design, the antenna uses a main structure thereof to provide a wide middle wideband of 1710~2690 MHz. Then, by combining an inductively coupled low-band branch strip with the main structure, the antenna can cover the desired lower wideband of 698~960 MHz. By further simply adding a short branch strip, the desired higher wideband of 3400~3800 MHz can be obtained. The antenna can achieve triple-wideband LTE/WWAN operation and occupy a small size of 10 ∗ 45 mm2 with a uniplanar structure. The second antenna design uses a main structure to provide an ultra-wideband of 1710~3800 MHz to cover the desired middle wideband and higher bandwidth. Then the desired lower wideband is achieved by applying the technique used in the first antenna with a high-pass matching circuit. The occupied clearance region of the second antenna is greatly decreased to 10 ∗ 35 mm2 only. The third antenna design uses a simple monopole structure integrating an internal low-pass matching circuit to cover the desired middle wideband and decrease the clearance region needed. In addition, by applying the previously presented techniques, the desired lower wideband can be generated. For the desired higher wideband, it is achieved by simply adding a short branch strip. Furthermore, the third antenna can be disposed in a smaller clearance region of 10 ∗ 30 mm2 with good radiation characteristics.
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LAI, TUNG-YU, and 賴東佑. "Design of LTE/WWAN small antennas for wireless communication device." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/37s7km.
Full textAbstract:
碩士南臺科技大學
電子工程系
105
This thesis proposes three designs of small antennas applied for LTE/WWAN systems. The first design is a USB dongle antenna for penta-band applications; the second design is a hybrid Loop/PIFA antenna for small and medium wireless communication devices; the last design is a Slot/Loop antenna for laptop computer products. In the first design, a monopole antenna is designed for LTE/UMTS/WLAN applications and used in USB dongle. The antenna is printed on a 1.6 mm thick of double-sided FR4 substrate. The overall dimension of the design is 60 mm × 12 mm, and the antenna section is 20 mm × 12 mm. The design structure uses the coupling between the paths to achieve the desired frequency band. The lower operating band is a combination of two lower resonant frequencies induced by the longest path on both sides of folding and bending of metal arm. The bandwidth at higher frequency is formed by the ground resonance mode and higher order modes of path on front side of the substrate. In the second design, a Hybrid Loop/PIFA antenna is developed for LTE/WLAN applications. The antenna is printed on a 1.6 mm thick of double-sided FR4 substrate. The overall dimension of the design is 45 mm × 10 mm, and the antenna portion is 15 mm × 10 mm. The design excites two different resonance modes. Hybrid antenna uses the loop structure of the coupling path on both sides, and the PIFA structure extends path from the through-hole. In higher frequency matching, the parallel inductor makes the fifth mode be matched to achieve WLAN 5.2 and WLAN 5.8 applications. In the third design, a Slot/Loop antenna is designed for LTE/UMTS/GSM applications. The antenna is printed on a 1.6 mm thick of single-sided FR4 substrate. The overall dimension of the antenna is 20 mm × 10 mm. Loop antenna excites periodic modes in the hinge slot of laptop computer. In lower frequency matching, the series capacitor effectively excites broad dual-band operation.
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CHIU, YU-CHIEH, and 邱昱潔. "Design of LTE/WWAN Mobile Phone Antennas on Metallic Frame." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/r22usb.
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Chen, Chia-Hung, and 陳佳鴻. "LTE/WWAN Antenna Designs with Matching Circuits for Tablet Computers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/04588154733486125656.
Full textAbstract:
碩士國立高雄師範大學
光電與通訊工程學系
104
LTE/WWAN Antenna Designs with Matching Circuits for Tablet Computers Students：Chia-Hung Chen Advisor：Horng-Dean Chen Department of Optoelectronics & Communication Engineering National Kaohsiung Normal University ABSTRACT This thesis proposes two LTE/WWAN antennas for applications in tablet computers. The first proposed antenna is composed of a dual-branch bent monopole. By using a high-pass π-type matching circuit integrated within the antenna, the bandwidth of the lower band for the proposed antenna can be enhanced. The second proposed antenna comprises of a folded dual-branch monopole antenna and an inverted-L coupling feed. A band-stop matching circuit integrated within the antenna is used to broaden the bandwidth of the lower band. Both of the proposed antennas can generate two wide bands for the WWAN/LTE operation to cover the LTE700/GSM850/900 bands (704 ~ 960 MHz) and GSM1800/1900/UMTS/LTE2300/2500 bands (1710 ~ 2690 MHz). The measured antenna efficiency of the first proposed antenna is about 37-75% for the lower band and about 40-65% for the upper band. As for the second proposed antenna, the measured antenna efficiency is about 40-65% for the lower band and about 47-81% for the upper band. The obtained antenna efficiencies are acceptable for tablet computer applications.
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Lu, Shih-Yu, and 呂世宇. "Design of Small Antenna for 4G LTE/WWAN Mobile Devices." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38535633750204008911.
Full textAbstract:
碩士國立中央大學
電機工程學系
104
This thesis mainly discusses the designs of 4G LTE multi-band antenna for the applications of the smart mobile devices. The idea of LTE multi-band antenna design is improved by the basic theory of monopole antenna. First, by adjusting the geometry of the monopole antenna, replacing the effect of the coupling feed by the chip capacitors, and replacing the antenna resonance path by the chip inductors, the overall area of the antenna is reduced. When designing the lower frequency (LTE 700 / GSM 850 / GSM 900), it is found that the generation of the single resonant frequency of the monopole antenna is not sufficient to achieve the desired system specification. When designing the higher frequency (GSM 1800/GSM 1900/UMTS 2100/ LTE 2300/LTE 2500), by adding a loop and a bending branch on the main resonance path of the higher frequency, the required 1 GHz bandwidth is achieved. In this thesis, the LTE antenna operates at five frequencies of 0.73 GHz, 0.91 GHz, 2.03 GHz, 2.25 GHz, and 2.66 GHz, which covering LTE 700 (698~787 MHz), GSM 850 (824~894 MHz), GSM 900 (880~960 MHz), GSM 1800 (1.71~1.88 GHz), GSM 1900 (1.85~1.99 GHz), UMTS 2100 (1.92~2.17 GHz), LTE 2300 (2.3~2.4 GHz), and LTE 2500 (2.5~2.69 GHz) with sufficient -6 dB bandwidths. The LTE antenna is designed on the FR4 circuit board with thickness of 1 mm, and area of the antenna is 24 x 16 x 1 mm3. Detailed antenna designs and experimental results are presented in the thesis.
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Hsiao, Yu-Ming, and 蕭又銘. "Multiband Antenna for LTE/WWAN/WLAN Mobile Handheld Device Application." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/64999029046127450572.
Full textAbstract:
碩士逢甲大學
通訊工程學系
104
This study focuses on compact multiband antennas, which can be used in smart phones and tablet computers. There are three different types presented in this research. Basically, the main structures of these antennas are an inverted-L monopole, a multi-branch monopole, and using a matching circuit with SMD inductor and capacitor. The first antenna can be applied in smart phones. It consists of an inverted-L feeding strip which is coupled to two folded shorting strips, one of them utilizing a three-dimensional bending structure. With this combination the design can not only reduce the antenna’s size but also reach the design requirements in lower band as well. As a result, this antenna only occupies 50×12×3 〖mm〗^3 and is fabricated on a 0.8 mm thick FR4 substrate, with a relative permittivity of 4.4 and a loss tangent 0.02. Its operating frequencies can cover LTE700/2300/2500 (704~787, 2300~2400, 2500~2690 MHz), GSM850/900 (824~894, 890~960 MHz), DCS (1710~1880 MHz), and WLAN2400 (2400~2488 MHz) bands. The second one is a multiband antenna also for smart phone. It can provide multiband operations in LTE700/2300/2500 (704~787, 2300~2400, 2500~2690 MHz), DCS (1710~1880 MHz), PCS (1850~1990 MHz), UMTS2100 (1920~2170 MHz) and WLAN2400 (2400~2488 MHz) bands. The antenna is formed by a multi-branch monopole coupled to a folded shorting strip, which is designed into a stereoscopic structure. This arrangement can not only reduce its size but also enhance the bandwidth of lower bands. It has a size of 55×11×3 〖mm〗^3, and is fabricated on a FR4 substrate, with a thickness of 0.8 mm, a relative permittivity of 4.4 and a 0.02 loss tangent. Similarly, both the first and the second designs can be applied in the 3G and 4G smart phones to provide the voice and internet/Wi-Fi services. The third one is a dual-wideband monopole antenna used in tablet computers for LTE operation. It is designed to cover operating frequencies of LTE700/900/2300/2500 (704 ~ 787, 885 ~ 960, 2300 ~ 2400, 2500 ~ 2690 MHz) and WLAN (2400 ~ 2488 MHz). By connecting a 9.1nH SMD chip inductor, it can decrease its required length. In addition, this antenna’s operating bands can be modified by adjusting the matching circuit’s SMD components to achieve the design requirement of lower band. Consequently, its advantages are simple structure, easy fabrication, small size, as well as easily integrated with the other elements in a thin tablet. The overall volume of this antenna is only 30×11×4 〖mm〗^3 with a ground copper plate of 0.2mm thickness, and an area of 150×200 〖mm〗^2. All three designs can not only supply the service to cover the current popular LTE bands but also acquire the advantages of low costs and thin shapes. They are suitable in modern devices for wireless mobile communications.
48
HAO-YING, CHANG, and 張浩穎. "LTE/WWAN多頻單極天線設計." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99571351419947687527.
Full textAbstract:
碩士國防大學理工學院
電子工程碩士班
104
In this thesis, a kind of wide-band antenna that covers 8 operating bands in a hand-held device is presented. The antenna design is based on Monopole antenna type, which uses couping feed method to expand antenna band-width to meet 8 operating bands in LTE/ WWAN hand-held device. The Monoploe antenna type used trace to feed for tuning matching and the plate and printed circuit board (FR4-PCB) of antenna. The Monopole antenna bandwidth is improved in the low, medium and high frequency ranges. The radiators were designed to meet LTE/ WWAN operating bands (LTE700,GSM850,GSM900,DCS1800,PCS1900,UMTS,LTE2300
49
Chen, Chih-Ming, and 陳志銘. "LTE/WWAN, UWB antenna design and analysis of IPEX connector." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/35276576182422823868.
Full textAbstract:
碩士明志科技大學
電機工程系碩士班
102
In the thesis, a coupled-fed monopole antenna, a planar hexagon-shaped monopole and a high-speed transition circuit board have been proposed. Firstly, the coupled-fed monopole antenna with 60(W)×15(L) mm2, covering about 0.69-0.99 and 1.45-2.94 GHz, is designed. The antenna integrates with a protruded ground plane, which is extended from the main ground plane of the mobile handset to accommodate a empty space in right side, and make one separated shorted-strip and muti-branch monopole get closer as a coupling feed and a radiator as well. The main resonant circuit provides for the higher band of 1.7-2.7 GHz and the shorted strip for the lower band of 0.7-0.96 GHz. As for the ground plane is able to balance the impedance of the antenna. In addition, the SAR (Specific absorption rate) value are also analyzed by SEMCAD X, and below the limit of SAR for 1-g human tissue of 1.6 W/kg. Secondly, the hexagon-shaped monopole with a dimension of 24(W)×30(L) mm2, covering about 3-15GHz, is printed on a double-layer1.6mm-thick FR4 substrate. The antenna designis fed by a microstrip line and suitable for UWB (3.1-10.6 GHz) antenna application. By using a gap between hexagon-shaped radiator and non-symmetric ground plane, it can generate multiple resonances to achieve the requirement of ultrawideband. Examining the both antennas are mentioned above, the simulated and measured results are obtained by using Ansoft HFSS software and network analyzer Angilent E8362B respectively reach good agreements. Based on the return loss, the former is suitable for DCS/PCS/UMTS, Bluetooth, WiMAX, LTE band applications and the latter is able to mount on UWB system, respectively. On the other side, one type terminator which is applied in high-speed connectors has also been proposed. The characteristic impedace and other electrical properties of the terminator are analyzed by HFSS and CST (Computer simulator technology) softwares. Accrounding to mearsurement method of standard EIA-364, good agreements between the simulated and measured results are obtained. The feature of the terminator can comply with the standard and be able to mount on any commercial electronic products.
50
Liu, Huan-Wen, and 劉煥文. "Design of LTE/WWAN Multi–frequency Antennas for Handheld Devices." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/30389992961366993383.
Full textAbstract:
碩士逢甲大學
通訊工程學系
103
There are three different antennas have proposed in this thesis. The main design concept of the antennas is applying a monopole as a direct feed and coupling feed structure, and using a SMD inductor to reduce antenna size. The first antenna is a small-size smart phone antenna with two wide operating band to cover the Long Term Evolution (LTE) and Wireless Wide Area Network (WWAN) operation in 704~960-MHz, and 1710~2690 MHz bands, respectively. The antenna has a stereoscopic structure and easy to fabricate on a thin FR4 substrate with a size of 125×15×3 mm3. The antenna is formed by a coupling feed with an inverted-F-shaped branch. The path of the inverted-F-shaped branch coupling feed to a C-shaped radiation arm, then through a meander line to the ground is to excite the low frequency band. The antenna has a size of 15×35.5×3mm3, and is fed by 50 Ω SMA connector. The second antenna is a low-profile, small size stereoscopic LTE/WWAN antenna suitable for slim tablet computer application. The antenna is formed by a F-shaped feeding strip, a coupling-fed shorting strip and folded branch strip connected with a chip inductor of 22nH. Owing to the high inductive reactance provided by the chip inductor, the fold branch strip has small effect on the antenna performances. Feeding strip and coupled-fed shorted strip can provide the operating band of 1710~2690MHz. At lower frequencies, the chip inductor can decrease the antenna’s required length, and the coupling feed couples to the shorting strip can greatly widen the bandwidth of the excited resonant mode such that the antenna can cover a low-band operation of 704~960 MHz The overall volume of the antenna is 10x40x4mm3. The size of the ground plane is 150×200 mm2, which one is copper constructed on a copper plate with a thickness of 0.2mm. This antenna is fed by a 50Ω coaxial cable. Finally, a MIMO antenna comprising a main antenna for LTE700 /2300 /2500), DCS 1800, PCS 1900, UMTS 2100, and WLAN 2400 operation and an auxiliary antenna to combine with the main antenna for LTE700/2300/2500 MIMO operation in the mobile phone is proposed. Both of them are disposed on the top edge of the handset and separated by a slot and a stub which improve this antenna’s isolation. Main antenna and auxiliary antenna have the same size in no-ground regions of 14×28×4mm3, and all of the MIMO antenna size is 114×65×4mm3. The main antenna covers the 704~787/1710~2690 MHz bands for LTE/WWAN operation, and the auxiliary antenna covers 704~787/2000~2690 MHz bands for LTE operation.