• Title/Summary/Keyword: 원형 배열안테나

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Analysis of the radome cavity-backed circular microstrip array antenna with triangular grid (Radome이 올려진 triangular grid의 cavity-backed 원형 마이크로스트립 배열 안테나 해석에 관한 연구)

  • 박경빈;정영배;최동혁;박성욱;문영찬
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.389-393
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    • 2000
  • 마이크로스트립 안테나는 다양한 장점에 의해 배열 안테나로서 각광을 받고 있다. 하지만 표면 전파에 의한 음영각 발생 및 이에 따른 조향각이 제한된다는 단점을 가지고 있다. 본 논문은 이러한 문제점들을 해결하기 위하여 radome이 올려진 cavity-backed 단일 방사 소자들을 showed array 구조론 통해 해결하는데 초점을 두었으며, 알고리즘에 대한 설명과 본 구조를 이용하여 실제 성능의 개선을 가져 올 수 있음을 보이고자 한다.

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Characteristics of Circular Polarization of Microstrip Patch Antenna Based on the Sierpinski Fractal Equilaterial Triangular (Sierpinski 프랙탈 삼각형에 기초한 마이크로스트립 패치 안테나의 원형 편파 특성)

  • 심재륜
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.234-237
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    • 2002
  • A microstrip patch antenna with circular polarization based on the Sierpinski fractal is composed of 3 equilaterial triangular Polarization by sequentially rotation techniques. The characteristics of a $1\times3$ antenna array from Sierpinski geometry an investigated, i.e. port isolation and AR(axial Ratio).

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Spatial Spectrum Estimation of Incident Signal Via Measured Array Manifold (측정 Array Manifold를 적용한 입사 신호의 공간 스펙트럼 추정)

  • 강흥용;이성윤;김영수;김창주;박한규
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.3
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    • pp.223-230
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    • 2004
  • A method for measuring array manifold which is the array antenna response of incident signal is presented. Array manifold measurement procedure by the presented method is explained for UCA(Uniform Circular Array), and spatial spectrum of 300 ㎒ tone signal incident on UCA is estimated by MUSIC algorithm in which spatial spectrum peak is searched with measured array manifold. Spatial spectrum estimation using array manifold measured by the proposed method shows superior performance to calculated array manifold.

Satellite Communication Microstrip Antenna for Tx/Rx Dual Operation at X-Band (X 대역 위성통신 송/수신 겸용 마이크로스트립 안테나)

  • Kim, Kun-Woo;Lee, Sung-Jae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.2
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    • pp.164-171
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    • 2014
  • Transmit(Tx)/Receive(Rx) dual band operation microstrip array for X-band satellite communications are designed, fabricated, and measured in this paper. The microstrip array antenna has Right Handed Circular Polarization(RHCP) for Tx band and Left Hand Circular Polarization(LHCP) for Rx band. Two stacked patches are used for wideband characteristics and corner-truncated square patches are adopted for a circular polarization. To enhance bandwidth characteristics of a circular polarization, $2{\times}2$ sequential rotation array are applied. From the measured result, $8{\times}12$ microstrip array antennas have a good agreement with those of the simulation. Therefore the array antennas are applicable to military satellite communication antennas.

4-Element Circular Array Dipole Antennas with Beam Steering (지향성 절환 4소자 원형 배열 타이폴 안테나)

  • 이종녕;양규식;김기채
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.4
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    • pp.386-392
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    • 2002
  • This paper presents a basic characteristics of 4-element circular array dipole antennas for 4-sector beam steering. The coupled integral equations for the unknown current distributions on dipole elements are derived and solved by applying Galerkin's method of moments. The parasitic elements have been used to increase the directional gain and the beam is steered electronically either by sswitching between the parasitic elements or switching the position of the active element. The parasitic elements are switched short-circuited or open-circuited as required to steer a directional beam. In order to verify the theoretical analysis, the radiation pattern was compared with experiments.

Gain Enhancement of a Circularly-Polarized Patch Antenna with a Double-Layered Superstrate for Wireless LAN (무선 LAN용 원형편파 패치안테나에 이중 적층 상부덮개를 적용한 이득 향상)

  • Lee, Sangrok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.12
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    • pp.2427-2433
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    • 2015
  • A high-gain circularly-polarized patch antenna with a double-layered superstrate is proposed operating at a wireless LAN frequency. A superstrate has an array of metallic periodic unit cells and is located above the patch antenna with an air-gap. The designed antenna has a high gain of over 9.59dBi, which is the gain enhancement of 6.48dB compared to the patch antenna without superstrate. And it has a low axial ratio of under 3dB, so that it maintains the circular polarization of the patch antenna. The optimum air-gap height at the superstrate of $4{\times}4$ arrays is 25mm, which is equivalent to about $0.2{\lambda}$ at the frequency of 2.45GHz. We confirmed that the double-layered stacking of a superstrate increases the effective aperture size and hence it leads to enhance a gain of the patch antenna.

Performance analysis of DoA estimation algorithm using a circular array antenna (원형 배열 안테나의 DoA 추정 알고리즘 성능 분석)

  • Lim, Seung-Gag;Kang, Dae-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.2
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    • pp.395-400
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    • 2008
  • This paper relates to the performance analysis of DoA estimation algorithm in 2-dimensional circular array antenna for the receiving of GPS signal which is used for the performance improvement by elimination of jammer signal. By performing the spatial filtering after the DoA estimation in array antenna, the quality of receiving signal can improve by the nulling of jammer signal from the undesired direction and the forming of beam from the desired direction. In this paper, the MUSIC and MinNorm algorithm used for DoA estimation were applied after fixing the angle and power of jammer signal in 4 element and 7 element circular array antenna. In order to performance analysis, the estimation result and estimation error were computed by computer simulation. As a result, the MUSIC and MinNorm were fairly good in azimuth and elevation angle estimation of DoA in case of good signal to noise ratio and the MUSIC has better performance compared to MinNorm in case of poor signal to noise ratio.

A Series Feeding Cross-Aperture Coupled Microstrip Antenna for Improving Axial Ratio Bandwidth of Circular Polarization (원형편파의 축비 대역폭 개선을 위한 직렬 급전 십자개구 결합 마이크로스트립 안테나)

  • 김형락;윤영중
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.4
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    • pp.393-400
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    • 2002
  • In this paper, a novel series feeding cross-aperture coupled microstrip antenna with the effect of hybrid feeding is proposed and demonstrated experimentally to improve narrow axial ratio bandwidth of cross-aperture coupled antenna with single feeding among the various methods for generating circular polarization. The validity of a proposed series feeding cross-aperture coupled microstrip antenna is shown by comparing experimental results between the reported and the proposed microstrip antenna, and 2${\times}$2 array microstrip antenna based on the proposed single microstrip antenna used sequential rotation technique to accomplish broader axial ratio bandwidth. In the proposed single and 2${\times}$2 array microstrip antenna, the measured axial ratio bandwidths are 110 ㎒(4.6%) and 420 ㎒(17.5%), maximum gains are 8.2 ㏈i and 12.5 ㏈i, 3 dB gain bandwidths are above 400 ㎒(16.7%), and impedance bandwidths for the VSWR<1.5 are 240 ㎒(10%) and 500 ㎒(20.8%), respectively.

Design of V/UHF band Small Dipole Circular Array Active Antenna (V/UHF대역 소형다이폴 원형배열 능동안테나 설계)

  • Ko, Ji-Hwan;Lee, Cheol-Soo;Kim, Kang-Uk;Cho, Young-Ki
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.1
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    • pp.6-16
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    • 2009
  • For the application to the direction finding(DF) antenna for V/UHF bands, circular active array composed of 9 dipole element has been investigate. For miniaturization of the overall size array, the element has been chosen to be of the top-hat dipole type. For the broadband operation over 20-1300MHz, some number of pin diodes have been inserted in each arms of each dipole element. By employing this type of each element dipole, the effective dipole length can be increased or decreased according as the inserted pin diodes is on or off. The active array antenna has been design to be directly connected to the balanced push full amplifier such that the amplifier may play a role as a balloon and may improve the sensitivity as a receiver as well. The active array antenna has been designed and fabricated. Some experimental results have been presented in comparison with simulated results.

Enhanced Resolution of Spatially Close Incoherent Sources using Virtually Expanded Arrays (가상 확장된 배열 안테나를 이용한 근접 입사신호의 분해능 향상 기법)

  • Kim, Young-Su;Kang, Heung-Yong;Kim, Chang-Joo
    • Journal of Advanced Navigation Technology
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    • v.6 no.3
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    • pp.181-187
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    • 2002
  • In this paper, we propose a resolution enhancement method for estimating direction-of-arrival(DOA) of narrowband incoherent signals incident on a general array. The resolution of DOA algorithm is dependent on the aperture size of antenna array. But it is very impractical to increase the physical size of antenna array in real environment. We propose the method that improves resolution performance by virtually expanding the sensor spacing of original antenna array and then averaging the spatial spectrum of each virtual array which has a different aperture size. Superior resolution capabilities achieved with this method are shown by simulation results in comparison with the standard MUSIC for incoherent signals incident on a uniform circular array.

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