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Dissertations / Theses on the topic 'Circular polarizer'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Van, den Berg Monique. "Thin linear-to-circular polarizers with enhanced bandwidth." Diss., University of Pretoria, 2018. http://hdl.handle.net/2263/64557.

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Circular polarization is valuable for many electromagnetic radiation applications such as wireless and satellite communication, radars, RFID, global positioning systems, etc. Many efforts have been made to manipulate and control polarization by using linear-to-linear or linear-to-circular transmission or reflection polarization converters. Most of the existing linear-to-circular single-layer polarizers have been found to be narrowband. Some attempts have been made to improve the bandwidth of these polarizers including using multiple layered structures at the expense of a bulkier device. There

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2

Klaren, Jonathan J. (Jonathan James). "Mode-matching analysis for discontinuities in waveguide and application to a waveguide circular polarizer." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36466.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.<br>Includes bibliographical references (leaves 70-71).<br>by Jonathan J. Klaren.<br>M.S.

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Narayan, Chaya. "Study of Optically Active Biological Fluids Using Polarimetric Data Analysis." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1314038487.

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Hong, Qi. "WIDE VIEWING ANGLE LIQUID CRYSTAL DISPLAYS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4042.

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In this dissertation, novel phase compensation technologies are applied to the designs of wide viewing angle and high transmittance liquid crystal displays. First, a design of wide viewing angle liquid crystal displays utilizing crossed linear polarizers is proposed. The designed multi-domain vertical-alignment liquid crystal display predicts superb contrast ratio over wide viewing angles. Next, to increase the bright state transmittance while maintain the high contrast. Finally, to reduce the cost and improve the applicability of the broadband and wide-view circular polarizer, the device conf

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5

Urbaník, Jaroslav. "Bikónická dipólová anténa s kruhovou polarizací." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219968.

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Tato diplomová práce se zabývá teoretickými poznatky a návrhem bikónické antény pracující v kmitočtovém rozsahu 4 až 8 GHz. V rámci práce jsou také popsány způsoby impedančního přizpůsobení a vybrané typy polarizátorů elektromagnetických vln a radioprůzračných krytů. Na základě teoretických poznatků je určena koncepce návrhu bikónické antény a vybrán vhodný polarizátor pro zajištění kruhové polarizace vyzařovaných elektromagnetických vln.

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Lecián, Petr. "Ozařovač parabolické antény v pásmu X." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218634.

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The work addresses the unusual proposal feed for parabolic antenna with circular polariza-tion signal. This is a modified waveguide feed, waveguide polarizer with a septum. Contemporary RHCP and LHCP wave occurs in several applications of microwave commu-nication and measurement system. From this point of view the septum polarizer can be useful. The septum polarizer is a four-port waveguide device. The square waveguide at one end con-stitutes two ports because it can support two orthogonal modes. A stepped septum divides the square waveguide into two standard rectangular waveguides sharing a c

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Edling, Thomas. "Design of circular polarized dual band patch antenna." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-174672.

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At the moment Swedish Transport Administration uses a monitor system that candetect urgent errors as warm ball-bearings and flat wheels etc. with stationarydetectors. To avoid these errors Swedish Transport Administration, UPWIS AB andUppsala University work with a system that will continuously monitoring the train todetect the errors as fast as possible. This will save money in the future for SwedishTransport Administration and all other partners that use the rails.Swedish Transport Administration has already RFID readers beside the rail to detecttrains position. The new monitoring system wil

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8

Parlett, Lucinda Catherine. "Molecules in circularly polarized light." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627330.

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9

Li, Tian-Yi, You-Xuan Zheng, and Yong-Hui Zhou. "Iridium(III) phosphorescent complexes with dual stereogenic centers: single crystal, electronic circular dichroism evidence and circularly polarized luminescence properties." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36123.

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Iridium complexes with a chiral metal center and chiral carbons, Λ/Δ-(dfppy)₂Ir(chty-R) and Λ/Δ-(dfppy)2Ir(chty-S), were synthesized and characterized. These isomers have the same steadystate photophysical properties, and obvious offsets in ECD spectra highlight both the chiral sources. Each enantiomeric couple shows mirror-image CPL bands with a dissymmetry factor in the order of 10ˉ³.

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Lim, Eng G. "Circular polarised microstrip antenna design using segmental methods." Thesis, Northumbria University, 2002. http://nrl.northumbria.ac.uk/1330/.

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Research into the modelling and analysis of microstrip patch antenna have been reported in many studies. These include Transmission Line Modelling, Cavity Modelling, Coplanar Multiport Modelling and Full wave Modelling. Since the electromagnetic field elements are time harmonic, the phasor-form of the Maxwell field equations is used. In this thesis results are presented of the research that has been carried out into the segmental approach for the analysis of the microwave patch antennas. The segmental approach includes the "Segmentation" and the "Desegmentation" methods. In the segmentation me

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Calleau, Antoine. "Broadband circulaly polarized Fabry-Perot antennas for space applications." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S092.

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Les travaux présentés dans cette thèse portent sur la conception de cavités de Fabry-Perot (FP) large bande, en polarisation circulaire. Une cavité compacte créée entre une surface haute impédance (SHI) et une surface sélective en fréquence (SSF) est alimentée par une source polarisée linéairement. La SHI ainsi que la SSF sont toutes deux tensorielles. Il est démontré qu'une telle cavité peut supporter un mode à ondes de fuite hybride, permettant la génération de la polarisation circulaire. La première partie de cette thèse est consacrée à la présentation d'un outil d'analyse numérique basé su

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12

McDonald, Luke Thompson. "Circularly polarised optics in Scarabaeidae." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/26536.

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In nature, both fundamental and sophisticated ecological functionality alike are driven by the display or, conversely, the concealment of colour and visual contrast. Through scientific investigation, the evolutionary genius manifested in numerous light manipulating biological systems has provided many blueprints for innovative photonic devices and other smart materials. The development of innovative bioinspired materials that harness the optical properties exhibited by chiral structures, such as those found in certain Scarabaeidae, offer widespread potential. In this thesis, the species-specif

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Daly, Steven. "Study of the photoionization of chiral molecules using polarized VUV radiation." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594763.

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Tastan, Mehmet. "Analysis And Design Of A Circularly Polarized Microstrip Antenna." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12607868/index.pdf.

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In this study we tried to design a microstrip antenna, to get a suitable radiation pattern for a LEO satellite. Our aim is to get a radiation pattern that has a maximum power which is not in the broadside direction to the antenna surface<br>instead broadside radiation has a relatively lower power density. Maximum power radiation is desired to be at about 30 &ndash<br>50 degrees angle beyond the normal to the antenna surface. We desire circularly polarized radiation. We used two concentric antennas<br>one is a circular patch at the center and the other is an annular ring which is used at the ou

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Abou-Zied, Nour Amro. "Study, design and realization of circular polarized compact antennas : Optimizing performances." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0027.

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Les antennes à polarisation circulaire (CP) sont de plus en plus utilisées dans les systèmes de communications spatiaux et terrestres. Le besoin d’intégration est sans cesse plus important, il est donc nécessaire de proposer, de mettre au point des aériens toujours plus compacts et aux performances (adaptation, rayonnement, gain, efficacité, taux d’ellipticité) optimisées. L’objectif de cette thèse est donc de concevoir des antennes planaires, large bande ou multi-bande, à polarisation circulaire et aux performances optimisées. Afin d’atteindre ces objectifs, le travail a été divisée en plusie

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PARTHASARATHY, KRISHNAN V. "MUTUAL COUPLING IN PATCH ANTENNA ARRAYS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148325728.

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Khoshniat, Ali. "A Linearly and Circularly Polarized Active Integrated Antenna." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/881.

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This thesis work presents a new harmonic suppression technique for microstrip patch antennas. Harmonic suppression in active integrated antennas is known as an effective method to improve the efficiency of amplifiers in transmitter side. In the proposed design, the antenna works as the radiating element and, at the same time, as the tuning load for the amplifier circuit that is directly matched to the antenna. The proposed active antenna architecture is easy to fabricate and is symmetric, so it can be conveniently mass-produced and designed to have circular polarization, which is preferred in

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Golmohamadi, Marcia. "Multi-Polarized Channel Characterization." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1026.

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Machine-to-machine (M2M) communication is becoming an important aspect of warehouse management, remote control, robotics, traffic control, supply chain management, fleet management and telemedicine. M2M is expected to become a significant portion of the Industrial Internet and, more broadly, the Internet of Things (IoT). The environments in which M2M systems are expected to operate may be challenging in terms of radio wave propagation due to their cluttered, multipath nature, which can cause deep signal fades and signal depolarization. Polarization diversity in two dimensions is a well-known t

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Mosser, Maëlle. "Molécules chirales à géométrie hélicoïdale : synthèse et modulation de leurs propriétés spectroscopiques par leur environnement." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN024/document.

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La chiralité est une propriété essentielle des molécules naturelles, intervenant dans de nombreux mécanismes biologiques du vivant. Elle peut être caractérisée grâce à l’activité chiroptique des molécules chirales, à travers le dichroïsme circulaire, le pouvoir rotatoire, la dispersion rotatoire optique ou encore la luminescence polarisée circulairement. Les molécules biaryles et hélicéniques possèdent des propriétés chiroptiques intenses et sont des molécules de choix pour leurs applications dans de nombreux domaines, de la catalyse à l’optoélectronique.Les travaux réalisés au cours de cette

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Lee, Wen-Wen, and 李雯雯. "Optimization of Septum Polarizer Design and Polarizer with Stubs to Improve the Circular-Polarized Radiation of the Horn Antenna." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/09827169636771985787.

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碩士<br>元智大學<br>通訊工程學系<br>96<br>A genetic software program is developed to provide seamless integration among commercial codes for analysis and simulation of electromagnetic problems. Combined with the genetic algorithm, the developed program is able to perform automatic tuning of the structures for optimized design of the polarizers in horn antennas. Numerical results show that proper stub insertions may provide additional freedoms to optimally design the polarizer with a better return loss and a flexible phase tuning, which is particularly useful to compensate the deficiency of a horn antenna

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Shian, Wei-Jiun, and 洗偉峻. "Investigation and Applications of Broadband Circular Polarizer Based on Flakes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01327142576952706462.

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碩士<br>國立聯合大學<br>光電工程學系碩士班<br>103<br>The main purpose of this thesis is to apply the polymer films photo-polymerized by two types of Reactive Mesogen monomers with chirality and unchirality, by changing the concentrations of monomers with chirality, We can control the reflection spectrum of the polymer cholesteric liquid crystal (PCLC). In this work, the spectrometer and polarization optical microscope (POM) were being used to measure the reflectance spectrum and to observe the flakes shape, respectively. The experiment result shows that the central wavelength of the reflection spectrum has blu

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Hsieh, Tzu-Hao, and 謝子皓. "Design of Dual-Band Circularly Polarized Microwave Polarizer." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50940601288038242701.

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碩士<br>國立中央大學<br>電機工程學系<br>101<br>In the thesis, a novel design of dual-band circularly polarized polarizer which can convert linear polarization to circular polarization will be present. The frequency selective surface (FSS) design procedure is based on filter synthesizing equivalent circuit. Filter synthesizing method provides design freedom, including the center frequency, band width, substrate selection and so on. A second order Butterworth dual-band filter design procedure is applied for synthesis of dual-band circularly polarized polarizer. Base on the second order Butterworth dual-band e

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Abdulhadi, A. E. "Analysis and design of single-fed circularly polarized circular microstrip antennas." Thesis, 2007. http://spectrum.library.concordia.ca/975279/1/MR28907.pdf.

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A novel design of a circular microstrip antenna with an additional small circular patch excited by a single feed for achieving a dual band frequency operation with circular polarization (CP) is presented. The implemented dual band circularly polarized antenna has a compact configuration that serves the technology demands requirements in mobile unit systems for smaller volume. Simulation and experimental results show that the 10 dB return-loss impedance bandwidth is better than that of a conventional single circular microstrip patch antenna. In addition, a dual frequency band operation at 2.45

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Huang, Chung-Shao, and 黃仲紹. "Higher-Order Mode Excitation and Circularly Polarized Radiation of CPW-fed Circular Microstrip Antenna." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/81495092823507124363.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>90<br>Higher-order mode excitation and circularly polarized radiation are two important applications of coplanar waveguide (CPW) fed circular microstrip antenna. In this thesis, design and analysis for these applications are presented. The experimental procedure and results are also described in detail. For excitation of higher-order modes, we introduce the capacitive and inductive coupled feeding structures. By tuning the dimensions of coupled slot and the feed position, higher order modes that we expected from circular microstrip antenna can be excited

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鄭至廷. "Circular Polarized Reflectarray Using Helical Element." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/80919640686006626378.

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碩士<br>國立彰化師範大學<br>電子工程學系<br>95<br>In this thesis, the circularly polarized reflectarray designed utilizing the helical antenna as an array element, and we presents the design methods of the circularly polarized reflectarray as an unit cell of reflectarray, and the theorem and technology of phase compensation also presented in the thesis. However, the characteristic of the single element infect the performance of the reflectarray seriously, we design an element in the form of axial mode helical antenna which far field pattern is end fire. In order to enhance the circularly polarized field, we u

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Huang, Jyun-Wei, and 黃俊瑋. "CIRCULARLY POLARIZED REFLECTARRAY." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65063150061453617996.

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碩士<br>大同大學<br>通訊工程研究所<br>93<br>This thesis studies a circularly polarized reflectarray based on a microstrip ring patch as a radiating element. Using microstrip rings for broadband performance combined with variable rotation to achieve the proper phasing between the elements. The ring antennas also have potential advantages of compact size and broader circularly polarized (CP) bandwidth as compared to the patches. In experiments, we build and test two arrays-one is a right-hand circularly polarized array and the other one is a left hand polarization. They are all in a round shape with an 18cm

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Yu, Yi-Chun, and 游逸群. "Wide-band Dielectric Septum Loaded Circular Polarizers." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/15298683243668153771.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>94<br>In this article, a circular polarizer based on dielectric septum loaded waveguide structure is chosen to be implemented because of its simple structure, good accuracy tolerance and easy tuning property. Both the perturbation theory and the 2-D full wave analysis have been used to find the waveguide propagation constant and the difference between the propagation constants of the two fundamental modes, Db. It is found that the Db curve increases with frequency rapidly after passing its minimum. To broaden the bandwidth of the polarizer, longitudinal slots were i

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Tango, Kung-Sheng, and 唐宮聖. "GPS Dual-Band Circular Polarized antenna Design." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p8qpdh.

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碩士<br>元智大學<br>電機工程學系乙組<br>107<br>In this thesis,We study GPS dual-frequency circularly polarized antenna. This thesis has 5 chapters. The first chapter introduces the motivation and purpose of this paper,Generally,the GPS antenna on the market is a single L1 (1575MHz) with other frequency bands (WIFI, 3G/4G/5G, Bluetooth, etc.).If the antenna has dual-frequency GPS circular polarization,it can increase the application and improve the delay through the ionosphere [20]. The second chapter is GPS introduction, positioning method and microstrip line theory. The third chapter is to derive the ante

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Shakeeb, Marwa. "Circularly Polarized Microstrip Antenna." Thesis, 2011. http://spectrum.library.concordia.ca/7119/1/Shakeeb_MASc_S2011.pdf.

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Tzung-Pei, Wu, and 伍宗培. "Circularly Polarized Printed-Aperture Antenna." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/95180950615057269898.

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碩士<br>大同工學院<br>電機工程研究所<br>86<br>In this thesis, a novel circular polarized aperture antenna is presented. This antenna uses a microstrip line to feed a truncated square aperture. A tuning metal strip is placed across the diagonal line of the aperture. The antenna is suitable in circuit integration that can avoid the difficulty of the coaxial line feed connection. A useful software IE3D is adopted to analyze the antenna based on the integral equation obtained through the use of Green's functions and the method of moment to solve the current distribution on the microstrip line and E-field di

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Li, Tzung-Yi, and 李宗益. "Wideband Circularly Polarized Slot Antenna." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19793730472336253370.

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碩士<br>臺灣大學<br>電信工程學研究所<br>98<br>An asymmetrical CPW-fed slot antenna with wideband circular polarization is proposed. The antenna has an asymmetrical feeding for the purpose of interfering with the current distribution on the ground. The antenna geometry is the combination of ground loop and signal loop. Besides, the CPW transmission line is attached with series stubs for impedance matching. By adjusting the parameters properly, a wide circular polarization operation bandwidth has been achieved. Based on the above concept, A wideband circularly polarized antenna fed by a microstripline i

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Wang, Sheng-shian, and 王聖憲. "CPW-FED CIRCULARLY POLARIZED ANTENNAS." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/63736901208201217382.

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碩士<br>大同大學<br>通訊工程研究所<br>96<br>In this thesis, a CPW-fed wideband circularly polarized antenna is proposed to provide wide impedance and axial ratio bandwidths simultaneously. The antenna is designed and implemented for the 3-GHz WiMAX access points. The measured 10-dB return loss bandwidth is 38.5 % (2.75~4.058 GHz), the 3dB axial ratio bandwidth is 22.3 % (3.288~4.111 GHz), and the in-band antenna gains lie in the range of 0.5~6.2 dBic. The measured radiation patterns are shown to be satisfactory across the entire operating band 3.4~3.69 GHz for the IEEE 802.16 group standards. The present

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Wu, Jia-Fent, and 吳嘉峰. "Reconfigurable Circularly-Polarized Microstrip Antennas." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76968067840334439501.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>96<br>This thesis presents the designs for reconfigurable microstrip antenna. Three types of the reconfigurable antenna are studied. The first one is a circularly-polarized (CP) microstrip antenna capable of switching polarisation sense. The microstrip antenna is excited by an open-loop microstrip line through the coupling of a ring slot in the ground plane. The polarisation diversity is achieved by using a pair of pin diodes to reconfigure the flowing path of the current on the open-loop microstrip feed line. The measured results show the 3dB-axial-ratio bandwidth

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林孝承. "Designs of circularly polarized antennas." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/99492762967000289775.

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碩士<br>國立高雄師範大學<br>物理學系<br>95<br>In this thesis, we mainly aims at the circularly polarized antennas. Through analysis and discussion of different antenna designs. Take the circular polarization three conditions of the design bases. In chapter 2 and 3 present two circularly polarized antenna designs. Using an unequal length L-shape coupling microstrip line and cylindrical dielectric resonator to achieve the circularly polarized dielectric resonator antenna. Other design a circular polarized antenna for global positioning system (GPS) by synthesizing two antennas.

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Hung, Wan-Ting, and 洪琬婷. "Circularly-Polarized Beam-Steering Reflectarray." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/55038798171656554403.

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博士<br>國立臺灣大學<br>電信工程學研究所<br>103<br>Three reflectarrays, including a near-field focusing reflectarray, a polarization-agile reflectarray, and a circularly-polarized beam-steering reflectarray, are proposed in this dissertation sequentially. In the first design, instead of designing for far-field radiation, which is common in conventional reflectarray design, we modify the methodology of phase compensation of the reflecting elements so that the reflected waves are in phase and focused at a predetermined focal point, enhancing the associated power density effectively. This design is utilized in t

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CHEN, GUAN-LIN, and 陳冠霖. "Circularly Polarized Monopole Antenna Designs." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/80716486991789568103.

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碩士<br>逢甲大學<br>電機工程學系<br>105<br>This paper studied the circularly polarized RFID reader antenna. The first antenna is a compact circularly polarized monopole antenna. It is fed by a microstrip line. By adjusting the parameters of the left branch and right branch, a circularly polarization with good impedance matching can be obtained. The overall dimension of the first proposed antenna is 60×60×0.8 mm3. The measured 10-dB return loss bandwidth of the antenna is 93.4 MHz (901 – 993.4 MHz, 9.3%), 3-dB axial ratio bandwidth is 12 MHz (916 – 928 MHz, 1.3%), the maximum gain and radiation efficiency

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Huang, Hao-Shiang, and 黃晧翔. "Circularly Polarized Monopole Antenna Designs." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/07486773061579913898.

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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>102<br>In this dissertation, circularly polarized (CP) monopole antenna designs for industrial, scientific and medical (ISM) band are proposed. First, by properly introducing dual strip-sleeves shorting at the ground plane, the antenna design provides the impedance bandwidths (RL≧10 dB) of 270 / 988 MHz and the 3 dB axial-ratio (AR) bandwidth of about 85/710 MHz for 2.4/5.2 GHz wireless local area network (WLAN) applications, respectively. The proposed planar antenna reduces the antenna size by at least 22% since the overall antenna size is only 40 × 40 × 1.6 mm3

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CHEN, BO-SYUN, and 陳伯勳. "Suspended Substrate Broadband Microstrip Antenna with Circular Polarized Properties." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/c6dnuj.

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碩士<br>大葉大學<br>電機工程學系<br>106<br>Abstract—In this paper, we study a circularly polarized microstrip antenna on a suspended substrate with a coplanar capacitive feed and a slot within the rectangular patch. Although microstrip antenna has been widely used in linear polarization, circular polarization (CP) operation may be obtained by modifying the structure of the basic antenna and/or feed. Modifications include adjusting the size of antenna and cutting a slot inside the rectangular patch,and research the uspended substrate, and this structure can be scaled to any frequency that you want to use.

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LIU, TANG-YU, and 劉瑭育. "Circular Polarized Antenna by Mutual Coupling with CPW-fed." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s7g2ep.

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碩士<br>大葉大學<br>電機工程學系<br>106<br>This thesisis a novel design of a circularly polarized coplanar waveguide (CPW) feed antenna for WLAN application. The antenna consists of a CPW feed structure, two square slots on either side of the feed end, and two staggered mutual resonance structures inserted into each square slot. The proposed antenna gives a circular polarization at a center frequency of 2.4 GHz, and the designed antenna size is 30 x 40 mm2. First design the simplest antenna, the length change on the reflection coefficient, find the nearest frequency band, and then narrow it so that th

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Hsaio, Yu-Hao, and 蕭宇皓. "Room Temperature Operated Ultraviolet Circular Polarized Metal-GaN Nanolaser." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/44930746405419229318.

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碩士<br>國立交通大學<br>光電工程研究所<br>105<br>In this thesis, we demonstrate a room temperature operated metal-GaN nanolaser and analysis lasing characteristic and polarization state of it. In the first part, we design our gammadion metal-cavity and use FEM to simulate the electric field mode profile. We then define the left-handed and right-handed gammadion pattern on our undoped GaN by e-beam lithography. We then etch down to GaN layer by ICP and finally we coat Al layer. After fabrication procedure, we use SEM to confirm our device fitting our design. We use micro-photoluminescence system to measure th

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Opie, Marc G. W. "Circular polarization from a circular array of linearly polarized rectangular patches with one end shorted." 1989. http://hdl.handle.net/1993/16950.

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Hsieh, Yu Min, and 謝裕民. "X-band Circularly Polarized Active Antennas." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/71468453663056776120.

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碩士<br>國立交通大學<br>電信研究所<br>85<br>Single, dual and quartet circularly polarized active antennas were designed and fabricated. Thesynchronization between units was reached by using the strongly coupled lines, which was introduced a20 ohm chip resistor in the middle of the line to suppress the undisired modes. The circularly polarized radiation was achieved by using the corner-truncated microstrip patch antenna. Themechanism of the antenna will be dicussed in this thesis. The design of the oscil

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Ma, Shun-Lai, and 馬順來. "Design of Circularly-Polarized Microstrip Antenna." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/06610291145302308844.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>96<br>The designs of circularly-polarized microstrip antennas are investigated in this thesis. The content of the thesis is mainly divided into three parts. In the first part, a conventional single-fed square microstrip antenna with circular polarization (CP) is studied. Several types of the perturbation segments are used to produce the CP radiation, such as using a square patch with a tuning stub or a pair of truncated corners, embedding a cross slot into the radiating patch, and cutting a C-shaped slot on the radiating patch. Their resulting CP performances are nu

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Lin, Yen-Chih, and 林彥鋕. "CPW-Fed Circularly Polarized Monopole Antenna." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/36587086447920777634.

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碩士<br>逢甲大學<br>產業研發碩士班<br>95<br>In this thesis, a CPW-fed circularly polarized monopole antenna has been implemented and investigated. The simulated and measured results of the antennas are detailed and analyzed. First, a new antenna possessing linear polarization and circular polarization for applications of the global positioning system (GPS) and digital communication system (DCS) has been designed. The proposed antenna consists of two parts: a quasi-C-shaped monopole antenna and an inverted L-shaped strip connecting to ground plane. By introducing a gap between the monopole antenna and inver

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Ke, Jhih-Yuan, and 柯智元. "Design of Wideband Circularly Polarized Antennas." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47883280030669303761.

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碩士<br>國立交通大學<br>電信工程系所<br>96<br>This thesis mainly focus on the design and discuss of wideband circularly polarized antennas and dual band antennas for wireless LAN purpose. Furthermore, the results from simulation and experimentation belong to the two kinds of antenna will be analyzed. At first, it would be proposed a concept designing planar wideband antennas in which improving bandwidth by way of adding parasitic elements. In order to achieve orthogonal energy exciting, it employs asymmetric-fed. Truncate a slot in the ground plane corresponding to radiator so as to pull the phase differenc

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Lin, Chan-Yu, and 林展裕. "EBG-Backed Circularly Polarized Aperture Antennas." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/14580996001704391430.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>95<br>This thesis proposed a novel EBG-backed circularly polarized aperture antenna. The basic principle of this antenna is that it uses the open stub of the microstrip of the first layer as the energy source to excite the circular aperture with embedded EBG structure of the second layer. We make the reflection phase differences of orthogonal direction of EBG be 90 deg to achieve circularly polarized antenna goal. The proposed EBG-backed circularly polarized aperture antenna is designed to operate in X- and V-band frequencies. The X-band antenna is fabricated wi

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Huang, Jen-Ting, and 黃任廷. "Isolated, Circularly-Polarized, High Harmonics Generation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f7tyru.

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Wu, Jin-Wei, and 吳俊緯. "Design of Wideband Circularly Polarized Antennas." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/35w485.

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碩士<br>逢甲大學<br>電機工程所<br>94<br>In this thesis, three antenna topologies for wideband applications are designed and studied, including a coplanar waveguide (CPW)-fed two-arm spiral slot antenna, a circularly polarized broadband rectangular multi-loop monopole antenna and a frequency-selective antenna module. The simulated and measured results of the spiral slot antenna, the rectangular multi-loop monopole antenna and the antenna module are analyzed. In the first part, novel designs of a CPW-fed two-arm spiral slot antenna are presented. In order to reduce the whole size, the conventional balun ci

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HUNG, I.-PING, and 洪一平. "STACKED RING-PATCH CIRCULARLY POLARIZED ANTENNA." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/87306844796159687779.

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碩士<br>大同大學<br>通訊工程研究所<br>98<br>In this thesis, a ring-patch circularly polarized antenna is presented. The ring is stacked above the patch and is separated from the patch by an air layer with around 0.1 wavelengths thickness. By controlling relative sizes of the ring and the patch, a wideband circularly polarized wave can be generated. In experiment, the antenna yields a 10dB return loss bandwidth of 15.7%(836-979MHz) and a 3dB axial ratio bandwidth of 7.7%(870-940MHz). the antenna gain is more than 6dBic within the over lapped return loss and axial ratio bandwidth.

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Wu, Min-chi, and 吳岷錡. "GAIN ENHANCEMENT FOR CIRCULARLY POLARIZED ANTENNAS." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/63389646741740414779.

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碩士<br>大同大學<br>通訊工程研究所<br>96<br>In this thesis, a microstrip patch antenna fed by a microstrip line is represented. This microstrip patch antenna is designed at 2.45GHz for wireless local area network (WLAN). The goal of this thesis is to enhance gain of microstrip antenna. An antenna radome is proposed to increase the gain of microstrip patch antenna and there is an air gap which is only 0.1 between two substrates. From simulation and measurement results, the gain of microstrip patch antenna with a radome increases 3.47dBi from 3.1dBi to 6.57dBi, and impedance bandwidth is 80MHz. Field distr

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