• Title, Summary, Keyword: Circular Array Dipole Antenna

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Design for Circularly Polarized Microstrip Cross Dipole Array Antenna by Electromagnetic Coupled Technique (전자기적 결합을 이용한 원편파 크로스-다이폴 마이크로스트립 어레이 안테나의 설계)

  • 민경식;임정남;김동철;임학규
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.369-373
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    • 2000
  • This paper describes a design for microstrip EMC cross dipole array antenna with circular polarization. To realize the wide bandwidth and circular polarization, the electromagnetic-coupled cross dipole is used. To obtain the uniform aperture illumination, offset technique for array is adopted. In 20-element array design, the calculated axial ratio and gain are about 0.1 dB and 9.9 dBi at 12GHz, respectively. The frequency characteristics of a fabricated 20-element array antenna are measured. The calculated results agree well with the measured ones.

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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.

Characteristics of Radiation Pattern and Power Gain for Circular Array Dipole Antennas (원형 배열 다이폴 안테나의 방사 지향성 및 이득 특성)

  • 이종녕;양규식;김기채
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.3
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    • pp.253-259
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    • 2003
  • This paper presents the basic characteristics of a 5 element dipole array antenna which has a four parastic element and one driving element at the center of the circular array. The coupled integral equations for the unknown current distributions on dipole elements are derived and solved by applying Galerkin's method of moments. The numerical results show that the highest power gain of 7.8 dBi is obtained at radius of d = 0.3lλ when two short circuited parastic element neighbors. In order to verify the theoretical analysis, the radiation pattern is compared with Preston's results.

A Multi-Channel Correlative Vector Direction Finding System Using Active Dipole Antenna Array for Mobile Direction Finding Applications

  • Choi, Jun-Ho;Park, Cheol-Sun;Nah, Sun-Phil;Jang, Won
    • Journal of electromagnetic engineering and science
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    • v.7 no.4
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    • pp.161-168
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    • 2007
  • A fast correlative vector direction finding(CVDF) system using active dipole antenna array for mobile direction finding(DF) applications is presented. To develop the CVDF system, the main elements such as active dipole antenna, multi-channel direction finder, and search receiver are designed and analyzed. The active antenna is designed as composite structure to improve the filed strength sensitivity over the wide frequency range, and the multi-channel direction finder and search receiver are designed using DDS-based PLL with settling time of below 35 us to achieve short signal processing time. This system provides the capabilities of the high DF sensitivity over the wide frequency range and allows for high probability of intercept and accurate angle of arrival(AOA) estimation for agile signals. The design and performance analysis according to the external noise and modulation schemes of the CVDF system with five-element circular array are presented in detail.

Design for the Circularly Polarized Microstrip Cross Dipole Array Antenna by Electromagnetic Coupled Technique (전자기 결합기법을 이용한 원편파 마이크로스트립 크로스 다이폴 어레이 안테나의 설계)

  • 민경식;임정남
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.1
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    • pp.50-57
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    • 2001
  • This paper describes a design for the circularly polarized microstrip EMC cross dipole array antenna with the wide bandwidth. To realize the characteristics of wide bandwidth and circular polarization, the electromagnetic-coupled cross dipole element is proposed. The optimum design parameters of a circularly polarized EMC cross dipole element are calculated by the FDTD and the Ensemble. To obtain the uniform aperture illumination of electric field in an array, offset technique that the cross dipole elements are alternatively arranged on center of the microstrip feed line is adopted. In 20-element array design, the calculated axial ratio and gain are about 0.1dB and 9.9 dBi at 12 GHz, respectively, The frequency characteristics of a fabricated 20-element array antenna are measured. The calculated results agree well with the measured ones.

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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.

An Experimental Study on Shaping Flat-Topped Element Patterns of a Multi-layered Disk Array Structure Excited by Cross-Dipole Elements (교차 다이폴 소자 여기에 의한 다층 원형 도체 배열 구조의 구형 빔 패턴 형성에 관한 실험적 연구)

  • 엄순영;박한규
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.7
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    • pp.712-720
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    • 2003
  • In this paper, a multi-layered metallic disk array structure(MDAS) excited by cross-dipole elements was proposed for efficiently shaping of flat-topped element patterns(FTEP) with circular polarization. The MDAS excited by cross-dipole elements has advantages to decrease in volume and weight of an overall array antenna and so, it is appropriate for the FTEP applications of a ralativlely low frequency band. In order to verify the effectness of this structure, the MDAS breadboard operated at X-band(7.9 ∼ 8.4 GHz) was fabricated, and its design parameters were experimentally optimized on the basis of the previous design experience. The experimental results were shown that the MDAS could shape good FTEPs of ${\pm}$20$^{\circ}$beam width at least within a 6.1 % frequency band.

The study of improving the performance of lower direction finding ability due to the interfered phase difference of circular array Antennas (원형배열안테나의 위상간섭에 의한 방향탐지 성능저하 개선연구)

  • Chung, Jae-Woo;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.535-539
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    • 2010
  • This paper include to study DoA(Direction of Arrival) for radio collection and monitoring system. The direction finding calculated by applying the CVDF (Correlation Vector Direction Finding) algorithm for the five circular dipole antenna over V / UHF band. To improve the accuracy of direction finding by applying CVDF algorithm needs to obtain ideal phase difference each antennas. However, a circular array antenna phase difference pattern may be distorted on a specific frequency band or to particular direction. The effect of installing each array antennas circularly and the effect of the interference of center pole (located in the center of a circular array antenna mount) may make the distortion of phase pattern. If you use an active antenna instead of passive antenna to obtain good sensitivity, you would measure the more distortion. This paper propose how to change combination of antennas to measure the phase in real-time and how to use antenna beam patterns for minimizing the degradation phenomena at applying simple CVDF algorithm and increasing the direction finding capability.

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Gain Characteristics of Circular array dipole Antenna with Beam steering (지향성 절환 원형 배열 다이폴 안테나의 이득 특성)

  • 최규락;김기채
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.394-397
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    • 1998
  • 본 논문에서는 중심에 급전 소자를 갖는 원형 배열다이폴 안테나의 이득 특성을 검토하고 있다. 중심 안테나 소자의 길이와 급전 안테나를 적절히 선택하여 무 급전 소자의 유도 전류에 의한 안테나의 지향성 및 이득 특성을 변화시킬 수 있도록 반경과 중심 안테나의 길이를 적절히 선택하고 있다. 수치계산 결과, 원형 배열의 반경과 중심 안테나의 길이를 적절히 선택하므로서 고 이득의 특성을 얻을 수 있었다.

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Design of a High Gain Circularly-Polarized Yagi Array Antenna for RFID Measurement Systems (RFID 측정 시스템을 위한 고이득 원편파 야기 배열안테나 설계)

  • Chae, Yoon-Kyoung;Li, Shu;Shen, Ai-Ling;Li, Jiong-Chen;Ahn, Bireng-Chearl
    • 한국정보기술학회논문지
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    • v.15 no.4
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    • pp.63-72
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    • 2017
  • In this paper, a high-gain circularly-polarized Yagi array antenna is designed for implementing a UHF RFID measurement system. The proposed antenna consists of a common square reflector, four Yagi elements and a feed network. A single Yagi element consists of a common square reflector, a folded dipole fed by electromagnetic coupling with a strip line, and 11 directors. The circularly-polarized wave is obtained by installing four Yagi elements at $90^{\circ}$ intervals on the common square reflector and by providing sequentially $90^{\circ}$ phase delays. The directors are fastened on the aluminum mast by bolting to obtain mechanical firmness. The feed network consists of three commercial $90^{\circ}$ hybrid coupler and one $90^{\circ}$ phase delay line for realizing circularly-polarized waves. The optimal designed antenna is fabricated and measured for verifying its performances. The fabricated antenna has shown that it has a reflection coefficient of less than -15dB, a circular polarized gain of greater than of 15dBic, a half power beamwidth around $30^{\circ}$ and an axial ratio of less than 1dB.