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Dissertations / Theses on the topic 'APERTURE COUPLED ANTENNA'

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Published: 11 September 2023

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1

Civerolo, Michael Paul. "Aperture Coupled Microstrip Antenna Design and Analysis." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/300.

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A linearly-polarized aperture coupled patch antenna design is characterized and optimized using HFSS antenna simulation software. This thesis focuses on the aperture coupled patch antenna due to the lack of fabrication and tuning documentation for the design of this antenna and its usefulness in arrays and orthogonally polarized communications. The goal of this thesis is to explore dimension effects on aperture coupled antenna performance, to develop a design and tuning procedure, and to describe performance effects through electromagnetic principles. Antenna parameters examined in this study
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2

Zubir, Farid. "Direct integration of push-pull amplifier and aperture coupled antenna." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6454/.

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The work described in this thesis concerns the integration of push-pull class B amplifier and antenna modules. Push-pull class B is well-known with its fruitful advantages of using differential feeding technique, resulting in low distortion, reasonably high efficiency and high output power. Meanwhile, the antenna module in this work is adapted from the aperture-coupled antenna structure due to its degree of freedom to control the variables which provide the best possible topology that could be realised in system on chip or system in package. More generally, the variables allow good coverage of
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3

Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.

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The focus of this dissertation is on the development and circuit modeling of planar series-fed, linear- and circular-polarized microstrip aperture-coupled antennas and N-element arrays operating in C-band. These arrays were designed to be used as part of airborne or land-based frequency-hopped communication systems. One of the main objectives of this work was to maintain a constant beam angle over the frequency band of operation. In order to achieve constant beam pointing versus frequency, an anti-symmetric series-fed approach using lumped-element circuit models was developed. This series feed
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4

Iseri, Kadir. "Analysis Of Dual-polarized Aperture-coupled Microstrip Antennas With H-shaped Slots And Equivalent Circuit Modeling Of H-shaped Slots." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614527/index.pdf.

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This thesis includes the design, production and measurement of a wideband dualpolarized X-band aperture-coupled microstrip patch antenna. The wideband and dual-polarized operation is achieved through the use of H-shaped coupling slots. Therefore, the equivalent circuit modeling of a microstrip line fed H-shaped slot is also studied in this thesis. A step-by-step procedure is followed during the design process of the dual-polarized aperture-coupled microstrip antenna. First, an aperture-coupled microstrip antenna with a single rectangular slot, that exhibits a wideband characteristic for single
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5

Vlasits, Tamas. "Modelling and application of a cross-aperture coupled single feed circularly polarised patch antenna." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245262.

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6

Liu, Lei. "Investigation of aperture coupled microstrip antenna to obtain a high efficient active integrated antenna by using Class F and Inverse Class F power amplifiers." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/21425/.

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In wireless communications and radar systems, there are requirements for high efficiency, small size, low cost, and wide bandwidth of transmitter front –end usage for commercial and also military applications. Active integrated antenna (AIA) could satisfy almost all the requirements. The overall objective of the proposed research is to model, optimise, and design a compact and high efficient AIA using an aperture coupled microstrip antenna (ACMA) by integrating with a power amplifier (PA). Research on ACMA has been focused on the transmissions line (TL) model (TLM) and full wave electromagneti
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7

Okuducu, Yusuf. "Dual Band Microstrip Patch Antenna Structures." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606859/index.pdf.

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Wideband and dual band stacked microstrip patch antennas are investigated for the new wideband and dual band applications in the area of telecommunications. In this thesis, aperture-coupled stacked patch antennas are used to increase the bandwidth of the microstrip patch antenna. By this technique, antennas with 51% bandwidth at 6.1 GHz and 43% bandwidth at 8 GHz satisfying S11&lt<br>-15 dB are designed, manufactured and measured. A dual-band aperture coupled stacked microstrip patch antenna operating at 1.8 GHz with 3.8% bandwidth and at 2.4 GHz with 1.6% bandwidth is designed, produced and m
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8

Bílek, Ondřej. "Flíčkový reflektor s elektronickým řízením směrové charakteristiky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316447.

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The diploma thesis is aimed to design, optimize, produce and subsequently measure the properties of the reflector with the electronic steering direction for the frequency of the 24,125 GHz band ISM. The problem chosen is solved by a group of voltage-controlled varicaps. The reflector consists of a matrix of two rows, each containing 3 cells. The reflector was designed by full-wave software CST Microwave Studio 2015.
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9

Liyakath, Riaz Ahmed. "Reconfigurable Antenna and RF Circuits Using Multi-Layer Stretchable Conductors." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4130.

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The growth of flexible electronics industry has given rise to light-weight, flexible devices which have a wide range of applications such as wearable electronics, flexible sensors, conformal antennas, bio-medical applications, solar cells etc. Though several techniques exist to fabricate flexible devices, the limiting factors have been durability, cost and complexity of the approach. In this research, the focus has been on developing stretchable (flexible) conductors using a multi-layer structure of metal and conductive rubber. The stretchable conductors developed using this approach do not lo
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10

GUGLIANDOLO, GIOVANNI. "Applications of Microwave Resonators to Thermal Metrology." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2849028.

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11

Jacmenovic, Dennis, and dennis_jacman@yahoo com au. "Optimisation of Active Microstrip Patch Antennas." RMIT University. Electrical and Computer Engineering, 2004. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060307.144507.

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This thesis presents a study of impedance optimisation of active microstrip patch antennas to multiple frequency points. A single layered aperture coupled microstrip patch antenna has been optimised to match the source reflection coefficient of a transistor in designing an active antenna. The active aperture coupled microstrip patch antenna was optimised to satisfy Global Positioning System (GPS) frequency specifications. A rudimentary aperture coupled microstrip patch antenna consists of a rectangular antenna element etched on the top surface of two dielectric substrates. The substrates
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12

Filice, Francesco. "Solutions innovantes d'antennes en bande Ku- et Ka- en technologie d’impression 3-D pour la réalisation des réseaux phasés visant des applications 5G et des communications mobiles par satellite." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4023.

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L'utilisation exponentielle d’applications mobiles entraîne une demande en constante croissance pour des débits de données de plus en plus élevés associées à des solutions de télécommunications mobiles à faible coût. Alors que les réseaux 5G en sont encore à leur début, les télécommunications mobiles par satellite (Sat-Com-On-The-Move) peuvent jouer un rôle central dans cette problématique. La bande passante disponible dans les bandes de fréquences Ku- (10,75-14,5 GHz) et Ka- (18-31 GHz) pour ces applications peut être exploitée afin de fournir une connexion internet globale à haut débit et fa
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13

Robinson, Bryan. "Mathematical modelling of aperture coupled patch antennas with multi-layered superstrates." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245239.

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14

Goksu, Mesut. "Analysis Of Slot Coupled Patch Antennas Using Closed Form Green." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610996/index.pdf.

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In this thesis, an analysis technique for the slot coupled patch antennas using MoM in conjunction with the closed form Green&rsquo<br>s functions is presented. Slot coupled patch antennas are fed by a microstrip open stub which is coupled to the patch through an electrically small slot. Current distributions over the microstrip line, slot line and the patch are represented by rooftop basis functions. First, a relatively simple structure, microstrip coupled slot line is investigated using the proposed technique. Then the method is extended to the slot coupled patch antenna geometry. By using t
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15

Kacar, Merve. "Direct Digital Manufacturing of Multi-layer Wideband Ku-band Patch Antennas." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7411.

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Design and performance of fully-printed Ku-band aperture coupled patch antennas fabricated by a direct digital manufacturing (DDM) approach that integrates fused deposition modeling (FDM) of acrylonitrile butadiene styrene (ABS) thermoplastic with in-situ micro-dispensing of conductive silver paste (CB028) are reported. Microstrip line characterizations are performed and demonstrate that misalignment of ABS substrate deposition direction with microstrip line micro-dispensing direction can degrade the effective conductivity up to 60% within the Ku-band, and must be taken int
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16

Nien-An, Kao, and 高念安. "Active Aperture-Coupled Leaky-Wave Antenna." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/86577771140409809941.

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碩士<br>國立交通大學<br>電信工程系<br>87<br>This thesis will investigate the active aperture-coupled leaky-wave antennas and the multi-beam aperture-coupled leaky-wave antenna, including design, fabrication and measurement. To excite the microstrip first higher mode, the aperture-fed structure is utilized and a sequence of covered wire is added in the center of this antenna to suppress the dominant mode. The leaky-wave antenna offers beam-steering capability, high gain and narrow main beam. In addition, the aperture-fed structure reduces the circuit size and offers an excellent shielding between active and
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17

GAO, YI-TAO, and 高易韜. "Series-fed aperture-coupled microstrip antenna array." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/89241900093145098936.

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18

Huang, Chien-Hsiung, and 黃建雄. "PARALLEL APERTURE-COUPLED DUAL-BAND CIRCULARLY POLARIZED ANTENNA." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67838891277471199597.

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碩士<br>大同大學<br>通訊工程研究所<br>99<br>This thesis presents a parallel feed line which couples diamond-shaped slot to ring and cross-slot to patch. The feed line is used to feed the two parts in parallel. Then, the structure can easily be operated as a dual-band circularly polarized antenna to cover both (0.902GHz~0.928GHz and 2.4GHz~2.5GHz) bands. Simulated and measured results indicate that the proposed antenna can achieve good circularly polarized radiation performance.
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19

Lin, Chung-Chu, and 林忠助. "Design of Micromachined Wideband Aperture Coupled Microstrip Patch Antenna." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/02144213947617591218.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>89<br>In this thesis, the characteristics of wide band aperture coupled microstrip patch antennas (MPAs) is studied. First, we conduct the basic theoretical analysis of the aperture coupled MPA. We use the full-wave numerical analysis method that has higher accuracy to understand the whole process of analysis. The purpose is to build up foundation of theoretical analysis for wide band aperture coupled MPA. Then, we design a series of the S-band aperture coupled MPA. The cheaper and more available FR4 PCB substrate is used to layout the element of antenna
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20

Chen, Chin-Yi, and 陳晉毅. "DUAL L-SHAPED APERTURE COUPLED WIDEBAND CIRCULARLY POLARIZED ANTENNA." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90041576368597294826.

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碩士<br>大同大學<br>通訊工程研究所<br>101<br>An aperture-coupled patch antenna is presented. The aperture is composed of two L-shaped-like slots and is proximately-fed by an L-shaped-like strip. The L-shaped-like strip is first coupled to the first slot through its vertical arm , then serially coupled to the second slot through its horizontal arm. The length of the vertical and horizontal arms of the L-shaped strip are found highly correlated to the axial- ratio bandwidth of the antenna. The center frequency in the return-loss plot of the antenna is also influenced by the two lengths. The optimized anten
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21

Majeed, Asmaa H., Abdulkareem S. Abdullah, Fauzi Elmegri, Khalil H. Sayidmarie, Raed A. Abd-Alhameed, and James M. Noras. "Aperture-Coupled Asymmetric Dielectric Resonators Antenna for Wideband Applications." 2014. http://hdl.handle.net/10454/8422.

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yes<br>A compact dielectric resonator antenna (DRA) for wideband applications is proposed. Two cylindrical dielectric resonators which are asymmetrically located with respect to the center of a rectangular coupling aperture are fed through this aperture. By optimizing the design parameters, an impedance bandwidth of about 29%, covering the frequency range from 9.62 GHz to 12.9 GHz, and a gain of 8 dBi are obtained. Design details of the proposed antenna and the results of both simulation and experiment are presented and discussed.
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22

Zebiri, Chemseddine, Mohamed Lashab, D. Sayad, et al. "Offset Aperture-Coupled Double-Cylinder Dielectric Resonator Antenna with Extended Wideband." 2017. http://hdl.handle.net/10454/13087.

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Yes<br>A compact dielectric resonator antenna for ultra-wideband vehicular communication applications is proposed. Two cylindrical dielectric resonators are asymmetrically located with respect to the center of an offset rectangular coupling aperture, through which they are fed. Optimizing the design parameters results in an impedance bandwidth of 21%, covering the range from 5.9 to 7.32 GHz in the lower-band and a 53% relative bandwidth from 8.72 to 15 GHz in the upper-band. The maximum achieved gain is 12 dBi. Design details of the proposed antenna and the results of both simulations and expe
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23

KUMAR, PEEYUSH. "DESIGN AND ANALYSIS OF APERTURE COUPLED ANTENNA WITH DEFECTIVE GROUND." Thesis, 2017. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16095.

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Aperture Coupled Micro-Strip Antenna Design and Analysis A linearly-polarized aperture coupled patch antenna design is characterized and optimized using Agilent ADS antenna simulation software [1]. This thesis focuses on the aperture coupled patch antenna due to the lack of fabrication and tuning documentation for the design of this antenna and its usefulness in arrays and orthogonally polarized communications. The goal of this thesis is to explore dimension effects on aperture coupled antenna performance, to develop a design and tuning procedure, and to describe performance effects through el
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24

Song, Yunpeng. "Radiation pattern of aperture coupled prolate hemispheroidal dielectric resonator antenna." Thesis, 2004. http://spectrum.library.concordia.ca/8393/1/MR04400.pdf.

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A detailed analysis and study of a prolate hemispheroidal dielectric resonator antenna (DRA) excited by a rectangular slot aperture are developed. The method used is based on the dyadic Green's function technique in the spheroidal coordinates. In this work, the dyadic Green's functions pertaining to a magnetic-current source located in a dielectric spheroid is derived and expressed in a form convenient for numerical computations. The dyadic Green's functions are then employed to formulate the electromagnetic fields radiated by the DRA. The electromagnetic far field is expressed analytically in
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25

Chen, Wei-Jen, and 陳威任. "Design of A Two-Dimensional Amplifying Antenna Array Using Multi-Ported Aperture-Coupled Patch Antennas." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43205645809279608852.

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碩士<br>國立交通大學<br>電信工程系<br>90<br>This thesis proposes a novel circuit-fed two-dimensional amplifying array using the multi-ported aperture-coupled patch antennas. Power coupling between the patch and feed circuit is through the apertures etched on the ground plane. This array is formed by reproductively connecting three basic cells, each with a multi-ported aperture-coupled patch antenna and some with one or two amplifiers, in sequence like stacking the LEGO blocks, so that a beam-shaped and high-gain amplifying array can be constructed quite quickly. An X-band 4×3 elements array with uniform
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26

陳柏州. "Design of Aperture Coupled Tri-polarization Antenna and Dual Planar Inverted-F Tri-polarization Antenna." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/64966525199777868040.

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碩士<br>國立交通大學<br>電信工程研究所<br>101<br>A design of aperture coupled tri-polarization antenna is presented in the first part of this thesis. By integrating an aperture coupled-fed antenna and a branch line coupler, the proposed antenna can provide a linear polarization and a pair of orthogonal circular polarizations, realizing the switchable tri-polarization characteristics. Since the phase difference and magnitude from two output ports of the branch line coupler varies by frequency, the polarization characteristic will also be changed. Since the branch line coupler provides two output signals with
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27

Kuan, Hua-Ling, and 關華凌. "Two-Directional Scanning by Using Short Leaky-Wave Antenna Integrated with Aperture Coupled Patch Antenna Phase Array." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50997717880444311222.

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碩士<br>國立交通大學<br>電信工程系<br>89<br>First, we present a two-directional scanning method by using a short leaky-wave antenna (LWA) integrated with aperture coupled patch antenna array on the bottom of the substrate. The aperture coupled patch antenna array is connected to the open end of the leaky-wave antenna. Such design offers another radiation path of the reflected wave and thus suppresses the power of reflected wave. The beam of the patch antenna array on the bottom plane can be steered by tuning individual phase-shifter connected to the patch antenna. The beam of the LWA is dominated by the fr
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28

Reddy, S. P. "A Reconfigurable Aperture Coupled Microstrip Patch Antenna with Beam Steering Capability on Silicon." Thesis, 2012. http://raiith.iith.ac.in/704/1/EE10M10.pdf.

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First reconfigurable antenna came into existence in early 1980s. Reconfigurable antennas provide various functions in operating frequency, polarization & radiation patterns since it can be used to avoid noise sources, improve system gain & security [1]. Reconfiguring the Frequency is the major issue & lot of recent work has been done on frequency reconfigurability A Barium Strontium Titanate (BST) based reconfigurable Aperture-coupled patch antenna on high resistivity silicon substrates with beam steering capability using PIN doides has been proposed in this paper. For low dielectric co
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29

Majeed, Asmaa H., Abdulkareem S. Abdullah, Fauzi Elmegri, Khalil H. Sayidmarie, Raed A. Abd-Alhameed, and James M. Noras. "Dual Segment S-Shaped Aperture-Coupled Cylindrical Dielectric Resonator Antenna for X-Band Applications." 2015. http://hdl.handle.net/10454/7885.

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yes<br>A new low-cost dual-segmented dielectric resonator (DR) antenna design is proposed for wideband applications in the X-band region. Two DRs coupled to an S-shaped slot introduce interesting features. The antenna performance was characterized in terms of the reflection coefficient, gain, and radiation pattern, and detailed simulation studies indicate excellent antenna performance from 7.66 GHz to 11.2 GHz (37.5% fractional bandwidth) with a maximum gain of 6.0 dBi at 10.6 GHz while the fabricated prototype has a matched bandwidth from 7.8 GHz to 11.85 GHz (41% fractional bandwidth) and ma
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30

Kim, David G. "Design of Stripline-Fed Dual Polarization Aperture-Coupled Stacked Microstrip Patch Phased Array Antenna for Wideband Application." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8567.

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Recent days, antennas play an important role in wireless communication system. Microstrip patch antennas are well known to have positive features for cost-effective, low profile and broadband. This type of antenna can be used in wide range of applications such as in wireless communications, radar systems, and satellites. Inhibiting characteristics of single patch antenna with low gain and narrow band leads to the research area to have array configuration. Beam steering antennas are the ideal solution for various systems such as traffic control and collision avoidance radar systems. The goal of
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31

洪天富. "Study of Aperture-coupled Stack Antenna with Minkowski island-based Fractal Patch for Circular Polarization Operation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/15203252048070565967.

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博士<br>逢甲大學<br>電機與通訊工程博士學位學程<br>102<br>The dissertation presents fractal theories, experiments and antenna design for Minkowski-island-based (MIB) fractal patch and complementary Minkowski-island-based (CMIB) fractal patch. Two antennas are discussed in this dissertation. The first antenna is a compact single-feed stack antenna consisting of a MIB fractal patch with perturbation element for circular polarization (CP) application, also proves the MIB fractal which can reduce antenna&;#39;s area. The second antenna is a single-feed stack antenna consisting of a complementary MIB (CMIB) fractal pa
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32

Chen, Rui-Hung, and 陳叡宏. "Aperture-coupled Microstrip Antennas." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/16893397530408364206.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>95<br>This thesis presents the designs of an aperture-coupled microstrip antenna with switchable polarization. Two orthogonal modes of the microstrip antenna can be excited by a series microstrip-line-feed configuration through the coupling of a ring slot in the ground plane. For the ring-slot-coupled microstrip antenna, the antenna can radiate linear (LP) or circular polarization (CP) with good performances by selecting a proper length of the open stub in the feed line. In addition, the LP radiation also can be excited through the coupling of an open-ring slot inst
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33

Chang, Sung-Hsien, and 張嵩賢. "Wide-Band Aperture-Coupled Microstrip Antennas." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/55325333498767240667.

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碩士<br>國立交通大學<br>電信研究所<br>82<br>This thesis presents two approaches to increase the antenna's bandwidth of conventional aperture coupled microstrip antenna structure. One is coplanar patches with one aperture coupled to microstrip line, the other is series-fed patches with apertures coupled to microstrip line. Both configurations are analyzed using an integral equation technique solved in spectral domain with the Galerkin method of moments. New numerically efficient methods are applied to ex
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34

Herscovici, Naftali I. "Analysis of aperture coupled microstrip transmission lines and antennas." 1992. https://scholarworks.umass.edu/dissertations/AAI9305839.

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The main subject of this work is the modular design of multilayer printed arrays. The need for a multilayer feeding network is evident in large arrays with a large number of power dividers or phase shifters. Due to space considerations the spurious coupling between the network and the radiating elements, or between different parts of the network itself, can be significant enough to degrade performance. In addition, corporate feed network radiation can affect the sidelobe and cross-polarization characteristics of the array. The use of a multilayer feed network located in a different plane than
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35

Chabi, Mhamed. "Modelling and analysis of aperture coupled cylindrical dielectric resonator antennas." 1995. http://hdl.handle.net/1993/18791.

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36

Chang, Wei-Chun. "Investigation of waveguide-fed, slot and aperture-coupled-patch antennas." 2001. https://scholarworks.umass.edu/dissertations/AAI3012121.

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Waveguide-fed, slot and aperture-coupled patch arrays suitable for a radiometer operating at K-band have been studied. Using such antennas, an electrical scanned thinned array radiometer (ESTAR) operating at 18.7 GHz can be built with dual linear-polarization and conical-scan capability. Green's functions involving spatial and spectral domain variables have been derived and used to obtain the current on the patches and the coupling apertures. Computer simulation code using triangular basis functions are developed to analyze slot-patch radiating elements. The simulation is verified with empiric
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37

Chang, Chun-Chuan, and 張鈞全. "A Design of Aperture-Coupled Microstrip Antennas with Low Cross-Polarization." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39298894366760812886.

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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 thesis first presents the performances of microstrip patch antennas excited by the aperture-coupling feed that is composed of a T-shaped microstrip feed line and an annular-ring slot. Because the annular-ring slot is designed at a full-wavelength resonant mode, a broad impedance bandwidth can be obtained by combing the resonant modes of the coupling slot and radiating patch; moreover, a low cross polarization is also observed, especially around the direction with maximum gain. Several prototypes of the proposed aperture-coupled microstrip antennas with dif
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38

Lin, Dah-Yah, and 林大業. "The design of dual-polarization aperture coupled microstrip antennas and the mircowave switch." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/57907036162996911636.

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碩士<br>國立中央大學<br>通訊工程研究所<br>93<br>In the thesis, two types of designs of dual-polarized aperture-coupled microstrip antennas are proposed. In the first design, the bandwidth (for VSWR<2) is increased to at least 2 times of single patch antenna, while the isolation between two ports for different polarization remain the same. In the second design, the performance of both bandwidth and isolation are improved. The thesis also discusses the design theorem and set up the design flow graph of antenna. Finally a single-pole single-throw (SPST) switch is developed for dual-polarized system.
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39

Lin, Jyun-ming, and 林俊鳴. "NEW FEED STRUCTURES FOR THE BROADBAND AND DUAL BAND APERTURE-COUPLED CIRCULARLY POLARIZED ANTENNAS." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/59357370002358608505.

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博士<br>大同大學<br>通訊工程研究所<br>100<br>Three circularly polarized antennas are designed in this dissertation. The first one is operated on a wide bandwidth (2.42 GHz–2.64 GHz); the second and the third one are dual-band (centred at 0.9 GHz and 2.45 GHz) antennas. For the wideband antenna, a novel aperture-coupled ring-antenna is presented. The antenna is fed by a microstrip line through a unique aperture coupling configuration. The aperture contains a square slot ring with four short branch slots protruding toward the center of the ring. It is studied that the axial-ratio bandwidth of 8.7% centered
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