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Dissertations / Theses on the topic 'Multiband and wideband antenna'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Mello, Rafael Gonçalves Licursi de. "Active and passive metasurfaces : methodology for the design of a low profile, beam-steerable, multiband, and wideband antenna." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT025.

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Les métasurfaces sont des matériaux artificiels qui peuvent être combinés avec des éléments micro-ondes traditionnels dans des solutions révolutionnaires. Les recherches sur l'utilisation des métasurfaces dans les rôles de réflecteur et/ou de superstrat d'antenne se sont considérablement intensifiées à partir du début des années 2020, en raison de leurs fonctionnalités innovantes alignées avec les dernières tendances en Télécommunications. Dans cette thèse, des méthodologies pour l'utilisation de métasurfaces passives et actives dans la conception d'antennes sont présentées. Une première métho

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2

Benomar, Ahmed. "Etude des Antennes à Résonateurs Diélectriques. : Application aux Réseaux de Télécommunications." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0025/document.

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Un développement technologique rapide dans le domaine de télécommunication, qu'il s'agisse de la téléphonie mobile, des réseaux sans fils, de la télévision par satellites, ou des applications radar (civiles ou militaires)...etc. est observé. Cet essor considérable a engendré d'énormes besoins et entraîne une évolution technologique majeure au niveau des antennes. Ces dernières doivent faire face aux différentes exigences, à savoir l'augmentation du gain, l'élargissement de la bande passante… et aux différents problèmes existant, à savoir le coût, l’encombrement…etc. Notre objectif est donc de

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Yousuf, Muhammad Amir. "Parametric Modeling of small terminals and Multiband or Ultra wideband Antennas." Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/63/48/66/PDF/Parametric_Modeling_of_UWB_antennas.pdf.

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Depuis le lancement systèmes des communications d'ultra large bande (ULB) en courtes distances les facteurs comme la miniaturisation d'appareil et haut débit créer des grands défis pour les concepteurs d'antennes. Une façon de faire le travail de conception facile est du modéliser statistiquement la variabilité de comportement de rayonnement de l'antenne en fonction de sa géométrie. Tel effort est également utile pour la meilleure utilisation du canal de communication si on combine le modèle d'antenne avec ça. Cette thèse est une tentative vers la modélisation statistique des antennes ULB. Le

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4

Muscat, Adrian. "The design of planar low gain, wideband and multiband antennas employing optimisation techniques." Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271716.

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5

Saleem, Rashid. "Towards an end-to-end multiband OFDM system analysis." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/towards-an-endtoend-multiband-ofdm-system-analysis(e711f32f-1ac6-4b48-8f4e-58309c0482d3).html.

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Ultra Wideband (UWB) communication has recently drawn considerable attention from academia and industry. This is mainly owing to the ultra high speeds and cognitive features it could offer. The employability of UWB in numerous areas including but not limited to Wireless Personal Area Networks, WPAN's, Body Area Networks, BAN's, radar and medical imaging etc. has opened several avenues of research and development. However, still there is a disagreement on the standardization of UWB. Two contesting radios for UWB are Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) and DS-UWB (Dire

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6

Yurduseven, Okan. "Integration of microwave antennas with solar PV for multiband and wideband mobile, WLAN and WiMAX applications." Thesis, Northumbria University, 2014. http://nrl.northumbria.ac.uk/17466/.

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The primary goal of this research is to investigate the existing photovoltaic antenna integration techniques and develop a new solar antenna integration topology in order to address the drawbacks of these techniques. With the increasing demands for low-profile antennas and a growing move towards the microgeneration of electricity, primarily by photovoltaics, photovoltaic antennas are of increasing importance with a growing amount of research in this area being developed. At present there are a number of designs for photovoltaic antennas which could be divided into two distinct categories. The

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7

Garrido, Lopez David. "Low-Profile Multiband and Flush-Mountable Wideband Antennas for HF/VHF and K/Ka Band Applications." Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245047.

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<p> This thesis introduces several novel antenna systems with extended performance capabilities achieved by either enabling multiple operation bands or by widening the bandwidth. Proposed theoretical concepts are successfully tested through simulations and experiments with excellent agreement are demonstrated. The designs developed in this thesis research are low-profile or flush mountable, enabling simple platform integration.</p><p> In the HF/VHF bands, the development of a novel low-profile multiband antenna for vehicular applications is presented. Specifically, an inverted-F antenna is u

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8

A, Rahim Mohamad Kamal. "Wideband active antenna." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404129.

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Adaniya, Hana L. "Wideband active antenna cancellation." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/47896.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (leaf 91).<br>There exists a simultaneous transmit and receive antenna system where the transmitted signal is creating wideband interference of the receiver. To resolve this interference problem, the isolation between the transmit antenna and the receive antenna must be increased. This thesis analyzes and discusses various strategies for antenna isolation and demonstrates the feasibility of an adaptive filtering approach on active signal ca

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10

Plaivech, Prachaya. "Wideband Antenna Over Ground Plane." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515450.

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11

Lourens, Jako. "A wideband monopole antenna design." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80026.

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Thesis (MScEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The successful operation of a man-pack VHF jamming system requires a compact and efficient antenna operating over a wide bandwidth. The design of such an antenna is the focus of this thesis. The antenna should be of a practical size for a portable system and it must radiate energy efficiently across a frequency bandwidth in excess of a decade. A practical „target‟ specification of such an antenna has been drawn up based on the performance of a commercially available system. Several possible antenna topologies, each with a v

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Seko, Murilo Hiroaki. "Antenas planares de micro-ondas multibandas para terminais móveis de sistemas de comunicação sem fio." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-31072013-002544/.

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Neste trabalho, foram desenvolvidas antenas planares de micro-ondas multibandas para aplicação em terminais móveis de sistemas de comunicação sem fio. Foi realizado um estudo sobre antenas planares de micro-ondas, com ênfase em técnicas de projeto que possibilitam a operação das mesmas em bandas largas e em múltiplas bandas. A partir dos conhecimentos adquiridos com esse estudo, foram propostas configurações de antenas para terminais móveis de sistemas atuais de telefonia móvel, de WLAN e de WPAN, sistemas esses que têm experimentado nos últimos anos uma grande popularização mundial. Por meio

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Lai, Hau Wah. "Wideband meandering probe-fed patch antenna /." access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b19887383a.pdf.

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Thesis (Ph. D.)--City University of Hong Kong, 2005.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 144-153).

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14

Powell, Johnna 1980. "Antenna design for ultra wideband radio." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28542.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, June 2004.<br>"May 2004."<br>Includes bibliographical references (p. 108-109).<br>The recent allocation of the 3.1-10.6 GHz spectrum by the Federal Communications Commission (FCC) for Ultra Wideband (UWB) radio applications has presented a myriad of exciting opportunities and challenges for design in the communications arena, including antenna design. Ultra Wideband Radio requires operating bandwidths up to greater than 100% of the center frequency. Successful transmission and reception

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15

Licul, Stanislav. "Ultra-Wideband Antenna Characterization and Modeling." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29487.

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A new methodology is presented for characterizing an antenna system both in the time and frequency domain with one set of parameters using a singularity expansion method representation. A minimal set of parameter modeling antenna systems using the Matrix-Pencil method has been demonstrated. It has been shown that it is possible to obtain frequency-domain patterns from pole/residue models of antenna realized effective length. Thus, a pole/residue model of the antenna realized effective length presents a complete description in both the time and frequency domains. Once such a model is available,

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16

Huynh, Minh-Chau. "Wideband Compact Antennas for Wireless Communication Applications." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29853.

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Recent technologies enable wireless communication devices to become physically smaller in size. Antenna size is obviously a major factor that limits miniaturization. In the past few years, new designs of low-profile antennas for handheld wireless devices have been developed. The major drawback of many low-profile antenna designs is their narrow impedance bandwidth. Furthermore, the market trend of personal wireless devices is moving toward a universal system that can be used anywhere and rapid expansion of the wireless communication industry has created a need for connectivity among various wi

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17

Smith, Christopher Brian. "Wideband dual-linear polarized microstrip patch antenna." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3162.

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18

Lai, Kin-Yue Albert. "A novel antenna for ultra-wideband applications /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487685204967095.

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19

Gemio, Valero Joan. "Multiband and Silicon Integrated Antennas for Wireless Sensor Networks." Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/79096.

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Les tecnologies sense fils han provocat una important revolució en el món de les xarxes i serveis de telecomunicació. Han apareguts nous sistemes com els telèfons mòbils d'última generació o les xarxes LAN sense fils que han estat acceptats amb entusiasme per la població. En particular, l'ús de xarxes de sensors (per controlar la temperatura, per a detectar places lliures d'aparcament, etc.) està creixent ràpidament . Aquesta tesi es centra en el disseny d'antenes per a xarxes de sensors distribuïts. En concret s'analitza un sistema on els sensors remots estan connectats a una unitat central

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Alsawaha, Hamad Waled. "Synthesis of Ultra-Wideband Array Antennas." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54553.

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Acquisition of ultra-wideband signals by means of array antennas requires essentially frequency-independent radiation characteristics over the entire bandwidth of the signal in order to avoid distortions. Factors contributing to bandwidth limitation of arrays include array factor, radiation characteristics of the array element, and inter-element mutual coupling. Strictly speaking, distortion-free transmission or reception of ultra-wideband signals can be maintained if the magnitude of the radiated field of the array remains constant while its phase varies linearly with frequency over the bandw

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21

Choi, Tin Chau. "An ultra-wideband magnetic-electric dipole antenna and a shielded slot antenna." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ38622.pdf.

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22

Salehi, Mohsen. "Time-varying Small Antennas for Wideband Applications." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/25435.

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A desirable goal in wireless communication systems is to achieve a high-rate data transmission through electrically small antennas. However, the overall transmission bandwidth is limited by the antenna size. As a well-known physical limitation, maximum achievable bandwidth of a small antenna is governed by the fundamental limit which defines a lower bound on the antenna quality factor. This limit is a function of electrical size of the antenna and therefore, as the antenna shrinks in size the bandwidth decreases as well. This dissertation presents a new technique to decouple the impedance band

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23

Shapoury, Alireza. "Ultra wideband antenna array processing under spatial aliasing." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1495.

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24

Adamiak, David V. "Transient field visualization for ultra--wideband antenna design." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374319.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1999.<br>"December 1999". Thesis advisor(s): Michael A. Morgan. Includes bibliographical references (p. 89). Also Available online.

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Karlsson, Magnus. "Ultra-wideband Antenna and Radio Front-end Systems." Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10338.

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The number of wireless communication applications increase steadily, leading to the competition for currently allocated frequency bands. Pressure on authorities around the world to permit communications in higher and wider frequency ranges to achieve higher wireless capacity than those existed in the past has resulted in several new specifications. The federal communication commission (FCC) in USA has unleashed the band 3.1-10.6 GHz for ultra-wideband radio (UWB) communications. The release has triggered a worldwide interest for UWB. Other regulatory instances throughout the world have issued

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Cheng, Shuo-peng, and 鄭碩鵬. "A Reconfigurable Multiband Monopole MIMO Antenna with Wideband Sensing Capability for Cognitive Radio." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04928024500876707688.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>103<br>Recently, radio spectrum is in high demand as the usage of the spectrum increases day by day at an enormous rate; there is a need to find a solution to efficiently utilize these insufficient resources. Cognitive radio is a huge step towards this goal. Cognitive radio has become a promising technology thanks to its inherent spectrum sensing capability and frequency-agile radio functions for efficient spectrum utilization. In order to achieve a cognitive radio antenna system, we have to design a frequency reconfigurable antenna and a wideband sensing antenna.

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Sie, Bing-Yan, and 謝秉諺. "The Research of Microstrip Antenna of Wideband and Inverted F Antenna of Multibands for Mobile Phones Applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99721918014394501882.

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碩士<br>崑山科技大學<br>電腦與通訊研究所<br>103<br>We present a novel antenna of wideband and omnidirectional characteristics. This antenna fed by a microstrip line and tuned by a little “T” matching network generating three resonant frequency points to construct 2-6 GHz wide bandwidth. This antenna can be applied to the applications of 802.11b/g/n/a/p/h and WiMax. This printed antenna etched on a double-sided FR4 board, the top of the FR4 board is the radiator contains a circle and a rectangle metal components, the bottom is a feeding microstrip line and a little “T” matching network. This FR4 board of 1mm

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Srivastava, Prateek. "MULTIBAND TRIANGULAR PATCH ANTENNA." Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14330.

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In telecommunication, there are several types of microstrip antennas (also known as printed antennas) the most common of which is the microstrip patch antenna or patch antenna. A patch antenna is a narrowband, wide-beam antenna. Microstrip antennas are relatively inexpensive to manufacture and design because of the simple 2- dimensional physical geometry. They are usually employed at UHF and higher frequencies because the size of the antenna is directly tied to the wavelength at the resonant frequency. A single patch antenna provides a maximum directive gain of around 6-9 dB. It is relat

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KUO, Chun-Yi, and 郭俊逸. "Design of Multiband Planar Antenna." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/94193761606288531922.

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YUEH, WANG CHUNG, and 王忠嶽. "Multiband Antenna Simulation and Design." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/34012930120670476862.

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碩士<br>大葉大學<br>電信工程學系碩士在職專班<br>97<br>This thesis presents the design of two printed dipole antennas. These two antennas were developed to produce multiple resonant bands so as to support multi-standard wireless-communication products, such as laptop computers, personal digital assistances (PDAs), and mobile wireless networking devices. These standards include GSM 900 MHz (Global System for Mobile Communications; 870-960 MHz), DCS 1800 MHz (Digital Communication System; 1710-1880 MHz), PHS 1900 MHz (Personal Handy-Phone System; 1890-1915 MHz), WCDMA 2100 MHz (Wideband Code-Division Multiple Acce

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Chen, Wen-Wang, and 陳文旺. "Design of Multiband Operation Antenna." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58373468536045029929.

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碩士<br>高苑科技大學<br>電子工程研究所<br>98<br>The paper presents study of multi-band monopole antenna, which utilize simulation software Ansoft HFSS 10 to measure the antenna return loss which under -10dB with Smith chart and coincidence to the standard of range, and the multiband ( DVB、 GSM、GPS、DCS、PCS、Bluetooth、WLAN and WiMAX ) are contained and applied. The monopole antenna uses slot、meanderings、parasitic antenna、loop、reflecting board and “ PIFA ”, those techniques attempted to encourage each band effectively. Due to the design of antenna on the base, some slots are used the impedances of loops to compe

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Siao, Sin-long, and 蕭新朧. "Miniaturized GPS chip antenna and multiband monopole antenna." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09486805850704632333.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>97<br>For future communication systems, to simultaneously meet various requirements such as low profile, compact size, light weight and easy fabrication, the dimension consideration of antenna design is a very critical part. The radiation performance of the antenna also directly affects the received signal and communication quality. Therefore this thesis proposes a miniature GPS antenna to be built in the mobile phone, PDA and smart phone for obtaining the satellite signals. A commercial EM solver, HFSS has been utilized to design prototype and investigate the perfor

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FAN, CHIH-WEI, and 范智偉. "Design of Multiband Coplanar slot antenna." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/63944947429000173611.

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碩士<br>明新科技大學<br>電機工程系碩士班<br>104<br>Coplanar slot antennas with three different shapes of radiator, comb, flag and polygon are designed in this thesis. Changing the element of comb radiator, the suitable size parameters are obtained from simulation. The simulated results are used to produce containing WLAN and LTE frequency bands antenna. Changing ground area of coplanar flag type radiator slot antenna is used to shift the impedance bandwidth to lower frequency. It can also be used to produce containing WLAN and LTE frequency bands antenna. Changing the bevel of polygonal radiator is used to ge

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Chao, Chun-heng, and 趙君恒. "Study of multiband slot antenna designs." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/2gzp58.

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碩士<br>逢甲大學<br>電機工程所<br>100<br>The thesis focuses on the design of slot antennas. Here, two slot antennas were proposed with different fed-techniques that allow the antennas to operate at different applications. A microstrip-fed slot antenna design for WLAN（2.4/5.2/5.8 GHz）application was initially proposed. In order to achieve dual-band operation, three slots were embedded into the ground plane that located beneath the microstrip feed-line. Two of the loaded slots were of step-impedance (SI) designs, and the third one was an inverted L-shaped slot. The proposed antenna exhibited 10-dB bandwidt

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TIAN, CHANG-FU, and 田章甫. "Design of Multiband Planar Dipole Antenna." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9tuy5f.

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碩士<br>明新科技大學<br>電機工程系碩士班<br>105<br>In this thesis, FR4 substrate and IE3D software are used to design multi-band antennas, including comb shaped with rectangular arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands, comb shaped with needle arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands, comb shaped with unequal rectangular arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands , and comb shaped slot antenna which can be applied to 0.7GHz 0.9GHz and 1.8GH frequency bands. In

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Hsieh, Yuan-pu, and 謝沅圃. "Multiband CPW-fed slot antenna design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10018352714300872868.

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碩士<br>逢甲大學<br>電機工程所<br>98<br>The thesis focuses on the design of slot antennas and proposes a series of coplanar slot antennas with different structures by using a variety of design methods to meet different applicable frequencies. First, the thesis proposed a dualband coplanar triangle ring slot antenna. The lower band (2.34-2.8 GHz) is excited by the triangular ring slot and capacitive load, while the higher frequency band is excited by two T-slots embedded in the triangular radiation element, and its wide impedance bandwidth (5.15-6.9 GHz) is also due to the capacitive load. This novel ante

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Zeng, Jian-Hong, and 曾建弘. "Design of Multiband Planar MIMO Antenna." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/23593305021202076714.

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碩士<br>龍華科技大學<br>電子工程系碩士班<br>102<br>This thesis presents a compact multiband planar MIMO antenna that covers the standards of the Global System for Mobile (GSM), Long Term Evolution (LTE) and Ultra-Wideband (UWB). The MIMO antenna contains two printed back-to-back multiband monopole elements with a closed distance of one-tenth wavelength of 900MHz. The element in the MIMO antenna is structured by merging an UWB antenna and a parasitic multi-loaded winding line monopole that is capable of providing the broadband coverage for the standards of the GSM, LTE and UWB. The size of the antenna element

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Chen, Zhi-Ying, and 陳智穎. "Design of Printed Multiband LTE Antenna." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u79ves.

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碩士<br>元智大學<br>通訊工程學系<br>106<br>With the rapid development of cellular communication and higher quality demands by the customers, the communication system has evolved to the fourth generation. Supporting multiple frequency bands in different regions becomes a must for the modern smart phone. In this thesis, a multiband printed antenna for Long-Term-Evolution(LTE) is presented. The proposed antenna is based on a ultra-wide band (UWB) planar triangular monopole antenna (PTMA) and have a volume of 60×100×1.6〖mm〗^3. The size of a PTMA is first enlarged to cover the target LTE multiple bands and a m

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YU, JIA-YI, and 余家一. "Designs on Multiband Antenna for LTE Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02510455459107705088.

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碩士<br>明新科技大學<br>電機工程系碩士班<br>104<br>In this thesis, coplanar waveguide feed and symmetrical ground are used to design the antenna. Chapter 3 and chapter 4 are themed with miniaturization, broadband and multi-band. Chapter 5 is focused on designing the antenna’s operating frequency bands which cover LTE 0.7/0.9/1.8/2.6GHz and WLAN 4.9GHz bands. In chapter 3, the radiator’s notch size parameter L5, the ground size parameters L2 and W2, and height of needle-shaped radiator H are changed to design the antenna which peak gain are 1.41dBi, 2.93dBi, 3.30dBi, 3.19dBi, 1.99dBi, 3.72dBi, 6.28dBi and 4.15

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Pan, Po-Yu, and 潘柏宇. "Study of Multiband Monopole Antenna for LTE." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3jrg8n.

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碩士<br>義守大學<br>電機工程學系<br>102<br>Antenna device needs to be able to send and receive signals in wireless network communications. As technology advances, Mobile band from the early GSM 900/1800 (2G) and now widely used cellphone multimedia transmission UMTS 2100 (3G) and is developing LTE 700/900/1800/2600 (4G). This paper presents the multiband antennas applicable for LTE, this antenna have three- frequency band, the main design principles combined with G-type monopole antenna and L-type monopole antenna, with two different shapes monopole excitation frequency to complete. First, use of G-type m

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Chien, Shih Chieh, and 簡世杰. "Wideband and Multiband Millime-ter-Wave Front-End Circuits." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/45488008294814444352.

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碩士<br>國立清華大學<br>電機工程學系<br>103<br>With the high demands of the high-speed point-to-point communications and real time multimedia streaming, increasing communication standards are proposed at the millimeter-wave band. Fully integrated wideband and multi-band voltage-controlled oscillators (VCOs), low-noise amplifiers (LNAs) and power amplifiers (PAs) have gained momentum in the past few years. However, the designs of the wideband and multi-band front-end circuits are complicated and challenging in order to achieve high performance on the specifications such as the phase noise of the VCO, the noi

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Lee, Meng-Che, and 李孟哲. "A Novel Method for Multiband Filtering Antenna Design." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/n72zq3.

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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>Filtering antenna is a single component which integrated bandpass filter and antenna in one module to achieve miniaturization and improve performance of microwave front ends. Most of the filtering antenna literatures operate in single band because the method they use is too difficult to design in multiband, especially in wideband. The integration approach they use is to substitute the last resonator and the load impedance of the bandpass filter with an antenna. As there is no literature about triple-band filtering antenna, it is a good topic for worthy discuss

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Chen, Weichuan, and 陳韋銓. "Design of Compound Multiband Antenna for Portable Devices." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65785114206860943501.

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碩士<br>明志科技大學<br>電子工程研究所<br>100<br>In this thesis, we have proposed a compound multiband antenna design for portable devices. The designs are composed of different monopole antenna models to composition small size, simple structure, multi-band operation of the monopole antenna for the mobile devices and USB dongle. The advantages of the proposed antennas overcome the problem of insufficient bandwidth and meet the radiation efficiency of the industry standards. The used designs of compound multiband antennas can cover the wide-band operation of GSM850/900/1800/1900/UMTS and ISM/WiMAX, respective

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Wang, Tai-Ming, and 汪泰名. "The Study in Multiband Elliptical-truncated Microstrip Antenna." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/72692904210775834297.

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碩士<br>中華技術學院<br>飛機系統工程研究所<br>96<br>In this thesis, a multiband elliptical patch microstrip antenna that have simple structure and was analyzed and optimized by using the IE3D software is proposed. The proposed antenna uses elliptical metal patch and coupling feed line on the FR4 printed board, in addition to increasing frequencies of antenna and improving whole performance by using shorting ping. It operates at GSM (880–960 MHz)、DCS (1710–1880 MHz)、PCS(1880–1990 MHz)、UMTS (1900–2170 MHz)、WiBro (2300–2390MHz)、Bluetooth (2.4–2.48 GHz).

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YANG, YI-YUNG, and 楊義勇. "Multiband antenna designs for applications in smart watches." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/58834346466725631023.

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碩士<br>國立高雄師範大學<br>光電與通訊工程學系<br>104<br>Three novel designs of the multiband antenna designs for applications in smart watches are presented in this thesis. The first proposed antenna has a simple open slot structure excited by a microstrip feedline. The achieved impedance bandwidths of the proposed antenna can cover the Bluetooth/Wi-Fi 2.4 GHz band (2400 ~ 2484 MHz). For the spacing 2 mm between the antenna and wrist, the antenna efficiency is 25% ~ 29%. The second proposed antenna consists of an open slot, a tuning slot and a two-branch microstrip feedline integrated with a chip capacitor. The

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Chan, Chao-Kai, and 詹兆凱. "A Coupling Slot Multiband Antenna for Mobile Phones." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65325308419270386965.

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碩士<br>國立交通大學<br>電信工程系所<br>97<br>A novel internal multiband slot antenna for mobile phone applications is presented. The antenna consists of two L-shaped slots of different lengths cut at the edge of the system ground and added a parasitic strip. It is shown that with a proper design, the two L-shaped slots can generate the operating bandwidths by coupling effect. And the parasitic strip is electromagnetically coupled and excited by the slot to generate the WLAN band. Hence, three elements can separately control the operating frequencies of the three excited resonant modes, which generate the t

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Wang, Yi-Shiang, and 王奕翔. "Planar Multiband Antenna Designs for Tablet Computer Application." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58632872871716047666.

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碩士<br>國立高雄海洋科技大學<br>電訊工程研究所<br>101<br>In this dissertation, two internal multiband antenna designs for tablet computer devices are proposed. First, by adding an internal printed loop as the LC matching circuit, the antenna design provides the impedance bandwidths of 262/1610 MHz for the application of LTE/WWAN system. The proposed uniplanar antenna reduces the antenna size by at least 30% since the overall antenna size is only 40 × 15 × 0.8 mm3. Meanwhile, the measured peak gains and antenna efficiencies are about 2.81/4.79 dBi and 79/87 %, respectively. Next, the second antenna design propose

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Gu, Jiun-Peng, and 辜駿鵬. "An LTE smart mobile antenna with multiband operation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/36566617569139439907.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>101<br>Two kinds of LTE smart mobile antenna with multiband operation are proposed to work in the bands of LTE, GSM, DCS, PCS, PHS, UMTS, Bluetooth, and WLAN. The initial design consists of a three-dimensional meandering monopole antenna constructed on the extended region of the PCB to reduce the space and also acting as the main radiator operating in the bands of LTE, DCS, and PCS, PHS, and UMTS. Subsequently, by adjusting the coupling between the monopole antenna and the shorted stub, the GSM band is added and the impedance matching in the band of LTE is improved.

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Wan, Yu-Chang, and 萬育章. "LTE Multiband Antenna Design for Wireless Network Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7nrv6y.

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碩士<br>國立臺北科技大學<br>電子工程系<br>106<br>To adapt the trend for the 4G LTE ( 4 Generation Long Term Evolution), this research paper is going to present the antenna for supporting 4G multi-band. Its applied on the wireless router and makes the channel selection more flexible with the WiSprys RF-MEMS technology. Eventually, to execute a system of the MIMO and adjust the high isolation. In this case, antenna is made by the techniques of the FR4 PCB. To meet the requirement from the different telecommunication operators, the author uses CPW-fed Monopole antenna which can apply the LTE Band 28/8/3/7. The

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謝維庭. "Multiband Antenna for WWAN/LTE Mobile Phone Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fzfmb3.

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碩士<br>逢甲大學<br>通訊工程學系<br>106<br>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 wit

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