• Title/Summary/Keyword: Microstrip Antennas

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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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    • 2002.11a
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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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Design and Fabrication of Microstrip Patch Antenna for GPS (GPS용 마이크로스트립 패치 안테나 설계 및 제작)

  • 이은진;강부식;홍성욱;김홍수
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.183-186
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    • 2002
  • In this paper, a microstrip Patch antenna with the T-shaped slits, which are employed to reduce the patch size. is proposed for GPS In order to analyze characteristics of the antennas are defined green function of the moment method. The microstrip Patch antenna and microstrip Patch with the T-shaped slits are fabricated. The numerical result of return loss and -10d13 bandwidth are compared with measured results.

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New Radiating Edges-Coupling (REC) Model for the Gap Between Two Rectangular Microstrip Patch Antennas (구형 마이크로스트립 안테나의 간격에 대한 새로운 Radiating Edges-Coupling(REC) 모델)

  • Hong, Jae-Pyo;Cho, Young-Ki;Son, Hyon
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.2
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    • pp.56-65
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    • 1989
  • In this paper, a new model is presented which characterizs the coupling of the radiating edges between two rectangular microstrip patch antennas. This model, namely Radiating Edges-Coupling (REC) model, is derived from the equivalent circuit of the slitted parallel-plate waveguide filled with homogeneous dielectric. Applying the REC model to two coupled rectangular microstrip patch antennas, we obtain numerical S-parameter values of |$S_{11}$| and |$S_{12}$|for the various coupling separations, $S_e$=0.5, 1.0, 1.5, and 2.0mm. Theoretical results are in fairly good agreement with experimental results.

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Satellite Communication Microstrip 8X2 Away Antenna for TX / RX Dual Operation at Ku-band (Ku 대역 위성통신 송수신 겸용 마이크로스트립 8X2 배열 안테나)

  • 윤재승;전순익;최재익;채종석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.574-581
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    • 2002
  • Microstrip $8{ imes}2$ sub-array antennas for a extension to active phased array antennas are designed, fabricated and measured for TX/RX dual operation in satellite communication and a reception of satellite broadcasting. For the frequency range from 11.7 to 12.75 GHz for RX and from 14 to 14.5 GHz for TX, two orthogonal linear polarizations of ${pm}45^{\circ}$ are used to transmit and receive simultaneously with one radiator. They adopt dual resonance between two patches for wideband characteristics in RX band and show isolation characteristics over 20 dB. An electrical beam tilt of $30^{\circ}$ is achieved and a tapered power distribution, narrow element spacing are used for the purpose of low side-lobe characteristics.

Low Profile Dual Feeding Microstrip Antenna with High Isolation (높은 격리도를 갖는 Low Profile 이중급전 마이크로스트립 안테나)

  • 김형락;권종훈;윤영중;윤재승;전순익
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.7
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    • pp.709-715
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    • 2002
  • In this paper, a novel low profile dual feeding microstrip antennas with microstrip and H-shaped aperture feeding are proposed to achieve high isolation and easy feeding, and the validity of the proposed antennas is demonstrated experimentally. In the proposed single and 1$\times$4 array antenna, the measured isolations are less than -49 dB and -48 dB, impedance bandwidths are 4 % at 12.5 GHz and 2.1 % at 14.25 GHz for the VSWR<1.5 in both antennas and maximum gains are 8.25 dBi and 14.2 dBi.

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.

Development of a Wideband EPR Spectrometer with Microstrip and Loop Antennas

  • Ponomaryov, A.N.;Choi, K.Y.;Suh, B.J.;Jang, Z.H.
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.178-182
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    • 2013
  • We have developed a new non-conventional electron paramagnetic resonance (EPR) spectrometer, in which no resonant cavity was used. We previously demonstrated a wide frequency range operation of an EPR spectrometer using two loop antennas, one for a microwave transmission and the other for signal detection [1]. In contrast to Ref. [1], the utilization of a microstrip antenna as a transmitter enhanced a capability of wide-band operation. The replacement of conventional capacitors with varactor diodes makes resonance condition easily reproducible without any mechanical action during tuning and matching procedure since the capacitance of the diodes is controlled electronically. The operation of the new EPR spectrometer was tested by measuring a signal of 1,1-diphenil-2-picrylhydrazyl (DPPH) sample in the frequency range of 0.8-2.5 GHz.

A Design of 3-Dimension Microstrip Antennas with Wide Bandwidth (광대역 3차원 마이크로스트립 안테나의 설계)

  • 오희태;조민규;김형동
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.5
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    • pp.727-737
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    • 1999
  • Printed microstrip antennas are known to have limitations in terms of bandwidth and efficiency all imposed by the presence of the dielectric substrate. In this paper, to overcome these limitations, rather than using a superstrate geometry, the printed circuit is etched out of metal and supported in "strategic points" by(metallic or nonmetallic) post. The main motivation for this work was to obtain the wide bandwidth microstrip antennal which exhibits a higher efficiency than conventional ones. In this paper, to increase the bandwidth, patch sizes, electrical thickness and impedance matching are considered.

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H-Plane Coupling Between Rectangular Microstrip antennas (구형 마이크로스트립 안테나의 H-Plane 상호결합)

  • Ko, Ji-Whan;Cho, Young-Ki;Son, Hyon
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.22 no.6
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    • pp.46-52
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    • 1985
  • A theoretical study of mutual coupling effects between two H-plane coupled microstrip patch antennas is presented. The radiation resistance and slot capacitance of a single micro-strip patch are calculated. To investigate the mutual coupling effects, the even and odd mode characteristic impedance and effective dielectric constants are obtained using the coupled microstrip line model. The S-parameter matrix elements 511,512 are used to study the mutual coupling e(facts in S-band frequency ranges for various patch spacings. Theoretical results and measurements are in good agreement.

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Design of Planar-Type Modified Folded Loop Antennas

  • Park, Sung-Il
    • Journal of information and communication convergence engineering
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    • v.8 no.5
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    • pp.489-492
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    • 2010
  • This paper proposes the planar-type modified monopole antennas of loop structure. This antenna has an opened center of a conventional closed loop structure with an inside-folded terminal of the loop microstrip line. The size of the proposed antenna was minimized by folding the end of the loop. Also, the reactance value has been minimized by increasing capacitances between the coupled microstrip line. Therefore the proposed antenna has been compacted to about 20% from a conventional loop antenna and has increased its efficiency. The proposed antennas have an omni-directional pattern, the antenna gain was 3.67 [dBi] and the bandwidth was 900 MHz (2.6~3.56 GHz) with VSWR$\leq$2 from the simulated and the measured results. The frequency utilization coefficient was 29.9%. These properties could satisfy the S-DMB band.