• Title/Summary/Keyword: Microstrip Antennas

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Fabrication of 24 GHz 3-Beam Scan Antenna for ACC Applications (자동 주행 차량을 위한 24 GHz 3-Beam Scan 안테나의 제작)

  • 원영진;이영주;공영균;김영수
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2002.11a
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    • pp.263-267
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    • 2002
  • For driver's convenience, the ACC (Adaptive Cruise Control) requires a system which controls the vehicle to keep the distance among the automobiles constant. This paper describes the microstrip array antennas designed to operate at 24 GHz, and used as a direction indicator of moving vehicles. $8{\times}2$ transmit away antenna with wide beamwidth, $8{\times}4$ receive center array antenna, and two $8{\times}8$ receive array antennas with narrow beamwidth were designed. The measured result shows that the designed array antennas arc suitable fur detecting 3 directions of the vehicle when the scan angle is within the restricted area.

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The Characteristic of L-shape and Triangular Slot Antenna

  • Narkcharoen, K.;Charkrit, P.;Anantrasirichai, N.;Wakabayashi, T.
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1680-1683
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    • 2003
  • To describe the performance of an antenna, some parameters are necessary. Some of the parameters are interrelate and not all of them must be specified for complete description of antenna performance. The parameters in characteristics of printed antenna for this analysis are radiation pattern, input impedance, VSWR, S parameter and electromagnetic field. In this paper we will consider two shaped of slot antennas one is triangular slot antenna and other is L - shape slot antenna for compare the radiation pattern, return loss, and VSWR. Two slot antennas are designed to have a resonant frequency at 10 GHz. The microstrip line is designed to be 50 ohms in order to match the measurement system, it has the substrate of the thickness = 1.52 mm and dielectric constant (${\varepsilon}_r$) 2.17. The problem space in the FDTD analysis are $60{\times}123{\times}100$ cells for L-shape slot antenna and $50{\times}171{\times}120$ cells for triangular slot antenna with the cell dimensions ${\Delta}x=0.152\;mm.$, ${\Delta}y={\Delta}z=0.15\;mm.$

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Effect of Finite Substrate Plane on the Radiation Characteristics of Microstrip Patch Antennas (기판의 크기가 마이크로스트립 패치 안테나의 방사특성에 미치는 효과)

  • Kim, Sang-Woo;Kim, Tae-Young;Kim, Boo-Gyoun;Shin, Jong-Dug;Kim, Se-Yun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.11
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    • pp.33-41
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    • 2007
  • Effect of finite substrate plane on the radiation characteristics of microstrip patch antennas is investigated. The variation of the characteristics of the radiation pattern due to the change of the length of a substrate is much larger than that due to the change of the width of a substrate. As the thickness of a substrate increases, the characteristics of the radiation pattern reveal more sensitive for the change of the size of a substrate.

Optimum Design of T-shaped Microstrip-line-fed Slot Antennas (T-모양 급전선을 갖는 마이크로스트립 슬롯 안테나의 최적 설계방법에 관한 연구)

  • 김권일;서영훈;박익모
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.4
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    • pp.562-569
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    • 2001
  • This paper presents the optimum design method for T-shaped microstrip-line-fed slot antennas on various substrates. Since the impedance bandwidth of the antenna depends highly on the vertical offset position and the length of horizontal strip conductor, we derived the formulas regarding these design parameters to get the maximum bandwidth. The formulas can compute the offset position and the length of horizontal strip conductor for any given substrate parameters. We compared the results obtained by using these design formulas and the one obtained by the simulation for each slot width, and it showed very good agreement.

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A Multiresolution Wavelet Scattering Analysis of Microstrip Patch antennas (마이크로스트립 패치 안테나의 다중 분해능 웨이블릿 산란해석법)

  • 강병용;주세훈;빈영부;김형훈;김형동
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.9 no.5
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    • pp.640-647
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    • 1998
  • Microstrip patch antennas are analyzed by a multiresolution wavelet method. The spectral Green's dyad of the structure is obtained and its joint spatial-spectral domain representations are presented. Based on the joint spatial-spectral domain representation, we show that the spectral-domain wavelets are useful in the analysis of this problem. We obtain the matrix equations of the integral equations of this Green's dyad by using the method of moment(MoM), and efficiently solve the problem using the spectral domain wavelet transform concepts in conjuction with the conjugate gradient method. The results for a single-layered square patch are compared with those of conventional MoM and CG-FFT.

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An Analysis of the Hybrid Finite Element Method for Scattering and Radiation by Microstrip Patch Antennas and Arrays Residing in a Cavity in a Ground Plane (접지평면상의 공간에 위치한 마이크로스트립 페치 단일 안테나와 배열 안테나에 의한 산란과 복 사에 관한 혼합유한요소법 해석)

  • 안중수;박동희;권희훈
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.12
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    • pp.2468-2478
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    • 1994
  • A hybrid finite element method is presented for a characterization of scattering an radiation properties of microstrip patch and arrays residing in a cavity recessed in a ground plane. The technique combines the finite element and boundary integral methods to formulate a system for the solution of fields at the aperture and the scattering field and radar cross sections at free space. By virture of the finite element method, the proposed technique is applicable to patch antennas and arrays residing on or embeded in a layered dielectric loss/lossless substrate and is also capable of treating various feed configuration. Several numerical results are presented demonstrating the validity, efficiency and capability of the technique.

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Design for Linearly Polarized Microstrip Antenna using Electromagnetic-Coupled Dipoles (전자기결합 다이폴을 이용한 직선편파 마이크로스트립 안테나의 설계)

  • 민경식;장철순
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1057-1066
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    • 2001
  • This paper describes a design for linear polarization antenna using the EMCD (electromagnetically coupled dipole). The analysis and the design of model antennas are conducted by FDTD method. Vertical and horizontal linear polarizations are easily obtained by variation of dipole position. In 1-element antenna design, mutual coupling between microstrip feed line and radiator is considered. Design parameters of each 1-element antenna with vertical and horizontal polarization are used for array design. Radiation power and main beam tilting angle can be controlled by the offset and the distance between radiating elements in an array, respectively. 5-element array antennas are fabricated and measured to prove the design validity. The results of FDTD simulation and measurement show the reasonable agreement.

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Spatially Combined V-Band MMIC Coupled Oscillator Array in Waveguide (도파관 내에서 공간적으로 결합된 V-Band MMIC 결합 발진기 Array)

  • 최우열;김홍득;강경태;임정화;권영우
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.8
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    • pp.783-789
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    • 2002
  • In this paper, V-band MMIC coupled oscillator arrays are presented. In the proposed array, two push-pull patch antennas are synchronized by using strong electromagnetic coupling between two antennas. As a result, total size of the array is reduced and the array can be integrated in a single chip. To verify proposed array concept, two 1$\times$2 arrays are designed and fabricated using standard 0.15 um gate length pHEMT MMIC process. The circuits are mounted in an oversized waveguide and measured. The first array shows 0.5 dBm at 56.372 GHz and the second one has an output of 5.85 dBm at 60.147 GHz.

Design of Miniaturized Microstrip Patch Antennas Using Non-Foster Circuits for Compact Controlled Reception Pattern Antenna Array

  • Ha, Sang-Gyu;Cho, Jeahoon;Jung, Kyung-Young
    • Journal of electromagnetic engineering and science
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    • v.17 no.2
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    • pp.108-110
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    • 2017
  • The global positioning system (GPS) is a useful system in civilian and military applications. However, because of the weak signal, GPS receivers are vulnerable to interference caused by unwanted signals or intentional jammers. To alleviate this issue, a controlled reception pattern antenna (CRPA) array can be employed to adaptively place radiation pattern nulls toward the direction of the signal interference. The performance of the CRPA array improves as the number of antenna elements increases. Therefore, antenna miniaturization is highly desirable for CRPA applications. We designed a compact CRPA array based on seven electrically miniaturized microstrip patch antennas (MPAs) on a 5-inch ground platform. We used a non-Foster matching circuit to match efficiently miniaturized MPAs on an FR-4 substrate. Experimental results show that the non-Foster matching circuit significantly improves such elements of antenna performance as return loss and antenna gain. In addition, we confirmed that the mutual coupling of the proposed CRPA array is less than -45 dB.

Design of Planar Microstrip Antenna at UHF ISM band for the Safety Communication of Life at Sea (해상인명 구조통신을 위한 UHF ISM 대역 평판형 마이크로스트립 안테나 설계)

  • Lee, In-Gon;Hong, Ic-Pyo
    • Journal of IKEEE
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    • v.16 no.1
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    • pp.62-68
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    • 2012
  • The planar microstrip antenna for the safety communication of life at sea is designed and manufactured to effectively receive the emergency wireless signal from the transmitter on the life vest. The proposed microstrip antenna in this paper is easy to make, light weight and cheap compared to other antennas because of printed antenna fabrication. To overcome the narrow bandwidth, large size and low gain characteristics of microstrip antenna, we use the IDMA(Identical Dual Patch Microstrip Antenna with Air-Gap) structure. The proposed antenna was fabricated with the use of 1.6mm FR4 and measured with the 28.7MHz(6.6%) of bandwidth and 3.04dBi of gain at the frequency of 426MHz. To validate the proposed antenna, we experimented the possible distance range at sea using the commercial UHF transceiver module and obtained over 5km distance for stable communication. This antenna can be widely applied to application of the UHF wireless mobile communication.