• Title/Summary/Keyword: Parasitic Antenna

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Electromagnetic Coupling Mechanism in the Aperture-Coupled and Feedline Gap-Coupled Microstrip Patch Antenna (Aperture와 Feedline Gap 결합으로 급전되는 마이크로스트립 패치 안테나의 전자기 결합 메커니즘)

  • Kim, Jong-Kyu;Yoon, Lee-Geun;Cho, Young-Ki
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.38 no.1
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    • pp.27-33
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    • 2001
  • This article describes an observation that the aperture coupling mechanisms in the aperture coupled microstrip antenna can be divided into two categories, cavity and parasitic types, depending on the separation between the microstrip patch and the ground plane. The similar phenomenon was observed in the relatively simple gap coupled microstrip antenna. The specific characteristics between two coupling mechanisms is discussed.

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The performance of a wireless LAN using SPA antenna beamforming (상용 무선랜 기반 SPA 안테나 빔포밍 성능 분석)

  • Cho, Seong-chul;Oh, Jeong-hoon;Choi, Hak-keun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.821-823
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    • 2015
  • In this paper, we investigate the SPA(Switched Parasitic Antenna), which is novel method of electronic beam steering. We analyzed the performance of the monopole SPA with one central active element surrounded by 4 parasitic elements. And we evaluate the performance of a wireless LAN using SPA antenna beamforming.

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Parametric Study of Slow Wave Structure for Gain Enhancement and Sidelobe Suppression (이득 증가와 부엽 억제를 위한 저속파 구조의 설계변수에 대한 연구)

  • Park, Se-Been;Kang, Nyoung-Hak;Eom, Soon-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.12
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    • pp.1059-1068
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    • 2016
  • This paper proposes slow wave structure(SWS) utilized to increase antenna gain of printed dipole antenna(PDA) and to suppress sidelobe level simultaneously, and makes sure of electrical characteristics of the antenna according to parameter variations of components of the slow wave structure. The printed slow wave structure which is composed of a dielectric substrate and a metal rods array is located on excited direction of the PDA, affecting the radiation pattern and its intensity. Parasitic elements of the metal rods are arrayed in narrow consistent gap and have a tendency to gradually decrease in length. In this paper, array interval, element length, and taper angle are selected as the parameter of the parasitic element that effects radiation characteristics. Magnitude and phase distribution of the electrical field are observed and analyzed for each parameter variations. On the basis of these results, while the radiation pattern is analyzed, array methods of parasitic elements of the SWS for high gain characteristics are provided. The proposed antenna is designed to be operated at the Wifi band(5.15~5.85 GHz), and parameters of the parasitic element are optimized to maximize antenna gain and suppress sidelobe. Simulated and measured results of the fabricated antenna show that it has wide bandwidth, high efficiency, high gain, and low sidelobe level.

A Study on Compound Technique for Increasing the Bandwidth of Microstrip Antennas using the Paralle Coupled Lines (평행 결합 선로를 이용한 복합 광대역 기법 적용 마이크로스트립 안테나에 관한 연구)

  • 김정일;한만군;윤영중
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.5
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    • pp.713-721
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    • 2001
  • In this paper, parasitic patches gap-coupled microstrip antenna and stacked microstrip patch antenna combined with parallel coupled lines, which are a kind of wideband impedance matching network, are proposed to get the wider bandwidth. The iterative method using a distributed network is proposed to design the parallel coupled lines as a wideband impedance matching network. Measurements show that the proposed antennas provide wider bandwidths ~1.6 times and ~1.5 times those of conventional parasitic gap-coupled microstrip patch antenna and stacked microstrip patch antenna. In addition, measured radiation patterns show no serious variation of radiation patterns though the parallel coupled lines is added. The antenna gain is, however, lowered about 1 dB and 0.5 dB by the coupling loss in the parallel coupled lines.

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A Broadband Microstrip Array Antenna for PCS/IMT-2000 Base-Station (PCS/IMT-2000 기지국용 광대역 마이크로스트립 배열 안테나)

  • 김태우;최재훈
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.11B
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    • pp.1620-1627
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    • 2001
  • In this paper, a broadband microstrip antenna for PCS and IMT-2000 service is designed. To obtain the broadband characteristics of an antenna, we utilized the multi-layered structure composed of two foam material layers, parasitic element and aperture coupled feeding network. The broadband characteristic is obtained by changing the size of parasitic element and the height of foam materials. In addition to that, the usage of metal layer at the distance of λ/4 from feed-line, back radiation is reduced. The bandwidth of a single element for VSWR less than 1.3 is about 550MHz. The bandwidth of a designed 1$\times$4 array antenna for VSWR less than 1.3 is about 460MHz. The gain of a designed array antenna is about 11.15∼12.15dBi and the front-to-back ratio is about 30dB.

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Analysis of the Rectangular Microstrip Antenna with Parasitic Elements Considering the Mutual Coupling Characteristics (상호결합 특성이 고려된 기생소자를 갖는 구형 마이크로스트립 안테나 해석)

  • Son, Geon-Ho;Yun, Li-Ho;Hong, Jae-Pyo;Cho, Young-Ki;Son, Hyon
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.12
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    • pp.12-17
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    • 1991
  • In this paper, E-plane gap-coupled rectangular microstrip antennas with parasitic elements are analyzed. The mutual coupling between the radiating edges is represented as the voltage-dependent current source. The gap coupling between the patch and parasitic element is characterized with the REC(Radiating Edges-Coupling) model, and the conventional transmission line model is used to obtain the equivalent circuit of the antenna. The return loss of the rectangular microstrip antennas with short-and open-circuit parasitic elements are calculated and compared with the measured values. The theoretical values including the mutual coupling are more in agreement with the measured values than the calculated values without the mutual coupling.

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ESPAR(Electronically Steerable Parasitic Array Radiator) Antenna Composed of Uniplanar Yagi Dipole and Two Parasitic Dipoles (단일면 야기 다이폴과 두 기생 다이폴로 구성된 전자 빔 조향 기생 배열 안테나)

  • Ju, Sang-Ho;Choi, Ik-Guen
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.12
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    • pp.1410-1415
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    • 2008
  • This paper proposes an small electronically steerable parasitic array radiator composed of a uniplanar dipole as a feeding element and two dipoles as parasitic elements. The fabricated antenna shows by measurement the $3.3{\sim}4.3\;dB$ gain between $-100{\sim}1000$ azimuth range in the dipole vertical plane and -10 dB return loss within $5.4{\sim}5.9\;GHz$, which includes $5.725{\sim}5.825\;GHz$ UNII band.

Design of Broadband Microstrip Antenna for 2.5GHz with Inverted Parasite Patch and the Proximity Stub (근접 스터브와 뒤집힌 기생 패치를 이용한 2.5GHz용 광대역 마이크로스트립 안테나의 설계)

  • Cho, Ki-Ryang;Kim, Dae-Ik;Kim, Gun-Kyun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.3
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    • pp.467-474
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    • 2019
  • In this paper, we studied a method for a broadband stacked patch antenna structure which is widely used for bandwidth improvement. The characteristics according to the distance between the two patches were analyzed and the impedance matching was optimized by connecting parallel open stubs to the main patch feed line. The shunt matching stub is inserted underneath the parasitic patch and so it does not require additional space, which enables the proposed antenna structure to be advantageous in miniaturizing antenna. The effects of the various parameters on the antenna performance are examined, and we introduced the design procedure for the proposed antenna to operate in the frequency range of 2.3~2.7GHz. Experimental results show that the bandwidth of the proposed antenna is about 480MHz with 2.27~2.75GHz bandwidth. And the antenna gain was 5.8dBi at 2.3GHz and 7.8dBi at 2.6GHz within the bandwidth.

7×7 MIMO System Using Extended 13-Element ESPAR Antenna (확장 13-Element EPSAR 안테나를 사용한 7×7 MIMO 시스템)

  • Bok, Junyeong;Lee, Seung Hwan;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39A no.2
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    • pp.69-76
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    • 2014
  • Multiple-input and multiple-output (MIMO) technique is used in many communication fields in order to increase the channel capacity. However, this MIMO system has difficulty of miniaturization of antenna size due to the multiple RF chains Also, multiple RF chain raises some problems which increase power consumption at RF circuit and degrade the system performance due to the interference between RF chains. Because of these reasons, beamspace MIMO (BS-MIMO) technique with only single RF chain was proposed for MIMO transmission. This BS-MIMO system basically uses electronically steerable parasitic array radiator (ESPAR) antenna. Existing ESPAR antenna has a 5-element structure. So, it is possible to do only $3{\times}3$ MIMO transmission. Therefore, in order to extend BS-MIMO dimension, extension of ESPAR antenna structure is essential. In this paper, we show that BS-MIMO dimension can be increased according to the extension of structure of the ESPAR antenna, as in the conventional MIMO techniques. For example, we show that it is possible to design the $7{\times}7$ BS-MIMO transmissions with the 13-element ESPAR antenna. Also, when the number of parasitic elements of ESPAR antenna increases by two elements, MIMO dimension is expanded by 1.

Ultra-wideband Antipodal Vivaldi Antenna with H-shaped Parasitic Patches (에이치(H)자 형태의 기생패치를 가진 초광대역 안티포달 비발디 안테나)

  • Jung, Dongkeun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.9
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    • pp.1642-1648
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    • 2017
  • Ultra-wideband antennas are desired for several applications including satellite communications, radars, remote sensing system, telescopes, and microwave imaging systems. There are many types of wideband antenna structures, but the tapered slot Vivaldi antenna is advantageous in terms of cost, weight, scan angle capabilities, end-fire radiation, and ease of feeding and system integration. In this paper, a modified antipodal Vivaldi antenna is presented. A novel AVA with H-shaped parasitic patches has the capacity to improve the radiation characteristics in the whole operation frequencies. A prototype of the modified antenna with RT/duroid 5880 substrate of a relative dielectric constant (${\epsilon}_r$) of 2.2, and a thickness of 31mil is fabricated and experimentally studied as well. It measures a ${\mid}S_{11}{\mid}$ of less than -10dB and gain of 9-12dBi over 7.8-52.5GHz which shows reasonable agreement with the simulated one.