• Title, Summary, Keyword: Wideband antenna

Search Result 405, Processing Time 0.036 seconds

Ferrite-based wideband circularly polarized microstrip antenna design

  • Mashhadi, Mostafa;Komjani, Nader;Rejaei, Behzad;Ghalibafan, Javad
    • ETRI Journal
    • /
    • v.41 no.3
    • /
    • pp.289-297
    • /
    • 2019
  • In this paper, a wideband, circularly polarized patch antenna is proposed that leverages the unidirectional resonant modes of a circular patch mounted on top of a grounded dielectric-ferrite substrate. The proposed antenna is fed via the proximity coupling method and several parasitically coupled patches are placed on a dielectric superstrate to enhance the impedance bandwidth of the antenna. The resonant modes of the structure rotate only in the clockwise or counter clockwise directions. In the frequency range where the effective permeability of the ferrite layer is negative, the resonance frequencies of these modes differ significantly, which produces a large axial ratio (AR) bandwidth. For the proposed antenna, the numerical results show the 10 dB impedance bandwidth to be around 44% and the 3 dB axial ratio bandwidth to be higher than 64%.

Small and Wideband Microstrip Antenna with Eccentric Radiating Structure and Low Impedance Feeding Structure (비동심원 복사구조와 저 임피던스 급전구조를 갖는 소형 광대역 마이크로스트립 안테나)

  • Shin, Ho-Sub
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.10 no.11
    • /
    • pp.1940-1945
    • /
    • 2006
  • The small and wideband annular ring slot antenna with eccentric radiating structure and low impedance feedline is presented. This antenna is analyzed by using substrate with permittivity 4.3 and thickness 1mm. As the measured impedance bandwidth of proposed antenna is $118%(S_{11}{\leq}-10dB)$, its bandwidth is much broader than that of conventional annular ring slot antenna.

Wideband Conformal Antenna for Endoscopic Capsule Application (캡슐 내시경에 응용 가능한 광대역 컨포멀 안테나)

  • Yoo, Hyoungsuk
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.6
    • /
    • pp.923-926
    • /
    • 2017
  • In this study, a novel wideband conformal thin antenna is presented for endoscopic capsule application at the 915 MHz Industrial, Scientific and Medical (ISM) band. The thickness of the antenna is only 0.2 mm which can be wrapped inside a capsule's inner wall. By cutting meandered slots on patch, open end slots on ground and utilizing long arm, the proposed antenna can obtain significant size reduction. The net volume of the proposed antenna including substrate and superstrate is only $37.4mm^3$ ($187mm^2$ surface area). This conformal antenna has shown good performance through simulation and measurement with maximum gain of -23 dBi and wide bandwidth from 137 MHz - 205 MHz depending on different environment. In addition, the effect of internal materials specially metallic battery is discussed briefly.

High-Gain and Wideband Microstrip Antenna Using Glass/Epoxy Composite and Nomex Honeycomb (유리섬유/에폭시 복합재료와 허니컴을 이용한 고성능의 마이크로스트립 안테나 설계)

  • You C.S.;Hwang W.
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • /
    • pp.1-4
    • /
    • 2004
  • In this paper we developed Composite-Smart-Structures(CSS) using sandwich structure composed of Glass/Epoxy laminates and Nomex honeycomb and microstrip antenna. Transmission/reflection theory shows that antenna performances can be improved due to multiple reflection by Glass/Epoxy facesheet, and honeycomb is used for air gap between antenna and facesheet. Stacked radiating patches are used for the wideband. Facesheet and honeycomb thicknesses are selected considering both wideband and high gain. Measured electrical performances show that CSS has wide bandwidth over $10\%$ and higher gain by 3.5dBi than initially designed antenna, and no doubt it has excellent mechanical performances by sandwich effect given by composite laminates and honeycomb core. The CSS concept can be extended to give a useful guide for manufacturers of structural body panels as well as antenna designers, promising innovative future communication technology.

  • PDF

Design of Extremely Wideband Printed Semi-circular-shaped Dipole Antenna (초광대역 인쇄형 반원모양 다이폴 안테나 설계)

  • Yeo, Junho;Lee, Jong-Ig;Park, Jin-Taek
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.17 no.9
    • /
    • pp.2003-2008
    • /
    • 2013
  • In this paper, a design method for a ultra-wideband printed semi-circular-shaped dipole antenna operating in the band of 1-15 GHz is studied. The effects of the gap between the two arms of the semi-circular-shaped dipole and the radius of the semi-circle on the input reflection coefficient and gain characteristics are examined to obtain the optimal design parameters. The optimized printed semi-circular-shaped dipole antenna is fabricated on an FR4 substrate and the experimental results show that the antenna has a desired extremely wideband characteristic with a frequency band of 1-15 GHz (175%) for a VSWR < 2.

Wideband Stacked Microstrip Antenna with Parasitic Patches for 800MHz Band (기생패치를 이용한 800MHz 대역 광대역 적층 마이크로스트립 안테나)

  • Kim, GunKyun;Lee, Jong-Ig;Ko, Jin-hyun;Rhee, Seung-Yeop
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.83-84
    • /
    • 2016
  • A wideband stacked patch antenna with parasitic elements, rectangular and triangle shaped patches, is proposed. Two different shaped parasitic elements are placed in the above of main rectangular microstrip patch antenna in order to achieve wide bandwidth for 860 MHz band. Coupling between the main patch and parasitic patches is realized by thick air gap. The gap and locations of parasitic patches are found to be the main factor of the wideband impedance matching. The proposed antenna is designed on a ground plane with small size of $119mm{\times}109mm$ for application of compact transceivers. And the impedance bandwidth of the antenna should satisfied CDMA band to the 780MHz~890MHz.

  • PDF

On the Degradation of a UWB System Due to a Realistic TX-RX Antenna System

  • Jun, Min-Sik;Oh, Tae-Won
    • ETRI Journal
    • /
    • v.27 no.4
    • /
    • pp.453-456
    • /
    • 2005
  • The ultra-wideband (UWB) signal radiation process in an antenna is different from that of a narrowband signal. In this paper, we study the degradation of the desired signal component according to the antenna structure and location of a receiver in a bipolar time-hopping UWB system. And we propose a receiver structure with an adaptive template waveform generator to compensate for the degradation caused by a realistic TX-RX antenna system.

  • PDF

Design of a Ku-Band Quasi-Yagi Antenna Array Using an Ultra-Wideband Balun (초광대역 발룬을 이용한 Ku 대역 Quasi-Yagi 배열 안테나 설계)

  • Woo, Dong-Sik;Kim, Young-Gon;Cho, Young-Ki;Kim, Kang-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.19 no.2
    • /
    • pp.207-213
    • /
    • 2008
  • A simplified design procedure for quasi-Yagi antenna arrays using an ultra-wideband balun is presented. The proposed antenna design procedure is based on the simple impedance matching among antenna components: i.e., balun, feed, and antenna This new broadband and high gain antenna array is possible due to the ultra-wideband performance of the balun. As design examples, wideband $1\times4$ and $1\times8$ quasi-Yagi antenna arrays are successfully designed and implemented in Ku-band with frequency bandwidths of about 50 % and antenna gains of 9$\sim$10 dBi and 11$\sim$12 dBi, respectively. And the simulated and measured results demonstrate wide bandwidths and good radiation properties. These antenna arrays can be applied to various phased-array and spatial power combining systems.

Ultra-Wideband Tapered Slot Antennas for Millimeter-Wave Systems (밀리미터파 시스템 응용을 위한 초광대역 테이퍼 슬롯 안테나 설계)

  • Woo, Dong-Sik;Kim, Young-Gon;Cho, Young-Ki;Kim, Kang-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.19 no.8
    • /
    • pp.913-919
    • /
    • 2008
  • A new design and its experimental results of a microstrip-fed ultra-wideband tapered slot antenna(TSA) for millimeter-wave systems are presented. By utilizing the ultra-wideband microstrip-to-CPS transition(balun), ultra-wideband characteristics of the inherent TSA are retrieved. Also, the design procedure of the TSA is simplified by performing simple impedance matching between balun and antenna. The proposed TSA is shaped by using the Fermi-Dirac tapering function and corrugated at the outer edge. The implemented antenna demonstrates ultra-wideband performance for frequency ranges from 23 to over 58 GHz with the relatively high and flat antenna gain of 12 to 14 dBi and low sidelobe levels. In addition, a 4-element linear antenna array for phased-array systems and mm-wave sensor applications is also presented.

UWB Circular Loop Antenna with Circular Sectors (원형 섹터를 가진 UWB 원형 루프 안테나)

  • Yeo, Junho;Lee, Jong-Ig
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.18 no.12
    • /
    • pp.2816-2822
    • /
    • 2014
  • In this paper, a wideband loop antenna for UWB applications is studied. The structure of the proposed wideband loop antenna is a circular loop antenna with appended circular sectors to obtain an ultra-wideband characteristic. The circular sectors are used instead of conventional triangular sectors to match with the 50 ohm feed line. Optimal design parameters are obtained by analyzing the effects of the gap between the circular sectors and the radius of the circular loop on the input reflection coefficient and gain characteristics. The optimized wideband loop antenna is fabricated on an FR4 substrate with a dimension of 41 mm by 41 mm. Experiment results show that the proposed antenna has a frequency band of 3.1-11.0 GHz for a VSWR < 2.25, which assures the operation in the UWB band. Measured gain ranges 1.3-5.3 dBi in the UWB band.