• Title/Summary/Keyword: Microstrip Antenna

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A Corner-Fed Microstrip Circular Antenna with Switchable Polarization

  • Sung, Young-Je
    • ETRI Journal
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    • v.30 no.5
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    • pp.718-722
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    • 2008
  • In this paper, a design for a novel microstrip antenna with circular polarization diversity is proposed and experimentally investigated. This antenna is excited by a microstrip line, which is located at the corner of a circular patch. The polarization state can be switched electrically by setting a diode to on or off. The novel structure we describe here enables the optimization of the input match for both polarizations. From the measured result, good axial ratios are observed at the operating frequencies.

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Radiation Admittance Calculation of the Rectangular Microstrip Antenna (구형 마이크로스트립 안테나의 복사어드미턴스 계산)

  • Hong, Jae-Pyo;Cho, Young-Ki;Son, Hyon
    • Proceedings of the KIEE Conference
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    • pp.430-432
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    • 1988
  • Radiation admittance of the rectangular microstrip antenna is calculated by using equivalent ${\pi}$-network parameters of the slit in the wall of the parallel plate waveguide filled with homogeneous dielectric. Using equivalent transmission line model, return loss is calculated and compared with experimental result. Calculated values for the return loss show good agreement with experimental values.

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Numerical Analysis of a Microstrip Antenna by 3-dimensional FMM (3차원 FMM을 이용한 마이크로스트립 안테나의 특성 해석)

  • Oh, Jae-Hyun;Jeon, Sang-Bong;Ahn, Chang-Hoi
    • Proceedings of the KIEE Conference
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    • pp.268-269
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    • 2007
  • In this paper, we develop 3-dimensional FMM using the RWG basis function to simulate the plat-type antenna and reduce the computing time. To examine the efficiency of FMM algorithm, a scattering by a simple PEC plane is analysed and the correct current distribution is obtained. This 3-dimensional FMM is applied to analysis a microstrip antenna and shows good performance.

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Aperture Coupled Microstrip Antenna Design . Using Genetic Algorithms (유전자 알고리즘을 이용한 개구결합 마이크로스트립 안테나 설계)

  • 서호진;김흥수
    • Proceedings of the IEEK Conference
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    • pp.207-210
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    • 1999
  • In this paper, aperture coupled microstrip antenna which has a larger bandwidth was designed using genetic algorithms. The genetic algorithms encodes each parameters which are the width, length of patch and the width, length of slot, into binary sequences, called a gen. Genetic algorithms searches a optimal gen to design a larger bandwidth. Simulation results are compared with Pozar's results.

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Near field Analysis of HTS Microstrip Antenna using Finte Element Method (유한요소법을 이용한 고온초전도 마이크로스트립 안테나 주변 저.자장 해석)

  • 정동철;박성진;허원일;한병성;구할본
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.324-327
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    • 1995
  • In this research, FEM solution to analysis near field of high Tc superconductor microstrip antenna is presented. This method uses the interpolation function with vector edge triangular element. The advantage of this element is elimination of spurious solutions which are attributed to the lack of enforcement of the divergence condition. The solutions of this method will be used to have a good fundamental data for next reaserch about analysis of HTS microstrip array antenna etc.

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A Small Microstrip Patch Antenna (소형 마이크로 스트립 패치안테나)

  • 장순범;박동국
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.246-249
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    • 2002
  • In this paper, a rectangular patch antenna is miniaturized by changing tile middle of patch into narrow microstrip line except the edges of the patch where the fringing field occurs. Miniaturizing rate, gain, radiation patterns of suggested antennas were compared with general square microstrip antenna by using simulator Ensemble. As a result, it reduces the size of antenna by 30% and improves the characteristic of X pol as a advantage while it reduces gain and bandwidth.

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Switchable Frequency of an Equilateral Triangular Microstrip Antenna with PIN Diodes (PIN 다이오드를 이용한 정삼각형 마이크로스트립 안테나의 동작 주파수 변환)

  • 김보연;성영제;김영식
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.11
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    • pp.1090-1099
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    • 2004
  • In this paper a novel design of equilateral-triangular microstrip antenna using PIN diode fur switching the resonant frequency is presented and experimentally studied. The proposed antenna has changed the resonant frequency by length of spur-lines on the patch, and PIN diodes are utilized to switch the spur-line on and off. The shape of the spur-line is changed according to the on and off states of PIN diode and the equilateral triangular microstrip antenna has different resonant frequencies in accordance with them. The resonant frequency is 1.22 GHz with off states since the surface currents flow the periphery of T shape spur-lines, while the resonant frequency is 1.82 GHz with on states since the surface currents are little effect with the conventional equilateral triangular microstrip antenna. The radiation pattern of the proposed antenna has a good linear polarization with the cross polarization of -20 dB both with on and off states.

Bandwidth Improvement of Circularly Polarized Microstrip Antenna for an UHF RFID Portable Reader (휴대용 UHF RFID 리더기용 원편파 마이크로스트립 안테나의 대역폭 개선)

  • Kim, Sang-Gi;Choi, Ik-Guen
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.4
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    • pp.404-410
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    • 2008
  • In this paper, circular polarized microstrip antenna with a conducted hollow cylinder-typed via around the coaxial probe is proposed to enhance the bandwidth of an RFID portable reader microstrip antenna. An antenna of thickness of 6.4 mm and size of $84{\times}84\;mm$ is manufactured with FR4 substrate and its 10 dB return loss bandwidth is measured to be 92 MHz, which is about three times large than the same size's microstrip antenna without hollow cylindrical via. The measured antenna gain and the axial ratio at each are $0.01{\sim}1.825\;dB$ and $2.3{\sim}8.2\;dB$ within 10 dB return loss bandwidth, respectively.

Design of Microstrip Antenna to Tune Resonant Frequency with Voltage Control (공진 주파수 전압 제어 마이크로스트립 안테나 설계)

  • Kim, Young-Ro;Woo, Jong-Myung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.8
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    • pp.688-693
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    • 2009
  • In this paper, a half wave-length microstrip antenna was proposed to be able to continuously tune the resonant frequency in the stated area of UHF ISM band. By loading varactor diodes at both edges of the half wavelength antenna, where the electric field is the strongest, and varying the voltage in order to tune the electrical resonance length continuously, it is possible to automatically recover the resonant frequency and input impedance shifted by surrounding environment. When the microstrip antenna(center resonant frequency: 425 MHB) was tested, by adjusting the each voltages of varactor diodes from DC 0.6 to BC 3.0 volts, the resonant frequency under 20 dB return loss was varied 385 to 465 MHz. The peak gain was -0.2 dBd and return loss -10 dB bandwidth was 3.3 MHz(0.8 %).

Miniaturization of Microstrip Antenna using Iris (Iris를 이용한 마이크로스트립 안테나의 소형화)

  • Seo Jeong-Sik;Woo Jong-Myung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.10
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    • pp.922-930
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    • 2004
  • In this paper, the 3-dimensional microstrip antenna, where the lis is attached near the patch, on the pound and both patch and ground in zigzag, is designed and fabricated to miniaturize size of antenna. The path of surface current and permittivity in patch are increased because of attached Iris near the patch, on the pound and patch and found. In particula., the maximum size reduction effect among the three-type of $79.1\%$(17 mm$\times$90 mm) was presented in zigzag-type compared with the rectangular microstrip patch antenna(MPA) with a height of 9 mm at the resonant frequency of 1.575 GHz. The gain showed -1.15 dBd, -10 dB bandwidth showed 6.2$\%$(98 MHz), and HPBW of E-plane showed $154^{\circ}$. As that result we could confirm that the 3-dimensional structure with attached Irises is the proper form for the miniaturization of microstrip antenna.