• Title, Summary, Keyword: microstrip antenna

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Design and Implementation of Koch curve Microstrip Patch Antenna for Antenna Miniaturization (안테나 소형화를 위한 koch curve 마이크로스트립 패치 안테나 설계 및 구현)

  • Kim, Sun-Woong;Lim, Dong-Seob;Kim, Young-Gon;Choi, Dong-You
    • Journal of Information Technology Services
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    • v.12 no.3
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    • pp.323-330
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    • 2013
  • In this paper, miniaturized patch antenna operating at ISM band has been designed by applying the fractal technique. Various type of antenna structure, microstrip patch antenna and koch curve microstrip patch antenna has been proposed and simulated using Ansoft HFSS (High Frequency Structure Simulator). The area of microstrip patch antenna and koch microstrip patch antenna is 1,058 $mm^2$, and 891 $mm^2$ respectively, showing the size reduction ratio of 16%. The finally made koch curve microstrip patch antenna resonates at 2.45GHz with return loss of 22.69dB, VSWR of 1.2142, and antenna radiation gain of 3.26dBi.

A study on microstrip antenna using PVDF (PVDF를 이용한 마이크로스트립 안테나에 관한 연구)

  • Kang, Hyun-Il;Song, Joon-Tae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.224-225
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    • 2005
  • The microstrip patch antenna with PVDF (poly vinylidene fluoride) substrate, were experimentally studied at frequency 6 GHz. During the design of the essential elements of microstrip antenna, EM simulation tool Ensemble V 7.0 is used. We observed the resonant frequency by DC appled electric field in a microstrip patch antenna. This research has been made as an electronically tunable microstrip antenna, taking advantage of the voltage control dielectric substrate and piezoelectric properties substrate. We discuss the effect of substrates, electric field and piezoelectric phenomena in the PVDF microstrip antenna. The antenna frequency can be changed by varying the applied dc voltage. In this paper, we propose, a new technique to agile frequency of the microstrip antenna by using the PVDF piezoelectric substrate.

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The Wide-band Two-element Microstrip Slot Array Antenna with the Cross-shaped Feedline

  • Shin, Ho-Sub;Kim, Nam;Jang, Yong-Woong
    • Proceedings of the IEEK Conference
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    • pp.163-166
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    • 2000
  • The design, numerical simulation, and an experimental implementation of two-element cross-shaped microstrip line-fed printed slot array antenna for IMT-2000 at the 2.0 GHz band is presented in this paper. The proposed antenna with relative permittivity 4.3 and thickness 1.0mm is analyzed by the Finite-Difference Time-Domain (FDTD) method. It was shown that the measured 2.0 VSWR bandwidth of one-element microstrip slot antenna is from 1.42 GHz to 2.69 GHz, which is approximately 61.8% and that of two-element microstrip slot array antenna is from 1.42 GHz to 2.56 GHz, which is approximately 57.3% And it was shown that the measured gain of one-element microstrip slot antenna is 2.75 dBi and that of two-element microstrip slot antenna is 4.75 dEi. The antennas were fabricated and tested. The measured results are in good agreements with the FDTD results.

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A Study on a Capacitively Coupled Microstrip Array Antenna (용량성 결합 마이크로스트립 배열 안테나에 대한 연구)

  • Lee, Jong-Ig;Yeo, Junho;Baek, Woon-Seok
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.63-64
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    • 2015
  • In this paper, a microstrip array antenna capacitively coupled to a microstrip line is studied. The array antenna consists of uniformly spaced rectangular microstrip patches arranged close to a feeding microstrip line on a grounded dielectric substrate. The effects of various parameters, such as strip width and length, distance between adjacent patches, gap between strip patches and microstrip feed line, on the antenna performance were examined. By properly adjusting geometrical parameters, the array suitable for a high gain antenna for use in a frequency band centered at 12.5 GHz was designed.

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Design and Fabrication of Microstrip Patch Antenna with T-shaped Slits for GPS (T형 슬릿을 갖는 GPS 수신용 마이크로스트립 패치 안테나 설계 및 제작)

  • Lee Eun-Jin;Lee Kwoun-Ig;Kim Heung-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.5
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    • pp.169-175
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    • 2006
  • In this paper, a microstrip patch antenna with the T-shaped slits is designed and fabricated for GPS. The resonant frequency of the microstrip patch antenna with the slits is lower than that of a microstrip patch antenna without the slits so it can be reduced the size of patch. In order to calculate resonant frequency of the microstrip patch antenna with the slits, the resonant frequency formulas are derived from the surface current distribution on microstrip patch antenna. Using the Ensemble 6.0 simulation tool, the accuracy of approximate equations is verified. The microstrip patch antenna with the slits is designed by using these equations. The size of the designed antenna with T-shaped slits can be reduced to 29% compared with that without the slits. The microstrip patch antenna with slits have a very narrow bandwidth. In order to improve the narrow bandwidth of microstrip patch antennas with the slits, a microstrip patch antenna with rectangular slot is proposed. As the result of the measurements, the resonant frequency of the proposed microstrip patch antenna with the T-shaped slits is 1.575GHz and the bandwidth is about 50MHz.

A Pair Dipole Antenna with Double Tapered Microstrip Balun for Wireless Communications

  • Lee, Hyeonjin
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1081-1085
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    • 2015
  • In this paper a printed pair dipole antenna with double tapered microstrip balun for wireless communications is proposed. The proposed antenna consists of a pair arm of different sizes that is branched microstrip line and microstrip line with the ground plane on opposite side of the dielectric substrate plane. The proposed antenna is matched between the ground plane to the microstrip line by double tapered microstrip balun. This antenna obtains multi-band radiation frequency band. The impedance bandwidths for a reflection coefficient of VSWR ≤ 2 are about 1.01 GHz (2.35~3.336 GHz), 1.56 GHz (4.7~6.26 GHz) and 1.15GHz (6.85~8.0[GHz]). Additionally, the measurement peak gain is about 3.6 dBi. The proposed antenna is able to support wireless communication applications.

The Design of Rectangular Microstrip Patch Antenna Using The Ring Feed Line (링 급전선로를 이용한 Rectangular Microtrip Patch Antenna 설계)

  • 고영혁;양규식;이종악
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.5
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    • pp.435-441
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    • 1989
  • The three rectangular microstrip patch antenna of Resonant length, lambda/2 or , between two slot is designed by using the ring feed line, and the radiation pattern characteristic is showen. In case of the antenna of resonant length lambda/2 the radation pattern is shown at each antenna element, in the antenna of resonant length it is shown among patch antenna element.

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Effect of Adjustable Antenna Substrate Thickness on Aperture-Coupled Microstrip Antenna

  • Somsongkul, T.;Lorpichian, A.;Janchitrapongvej, K.;Anantrasirichai, N.;Wakabayashi, T.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1664-1667
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    • 2003
  • Aperture-coupled microstrip antenna is one type of microstrip antennas. This type of antenna has bandwidth wider than simple microstrip antenna. Herein, we use two substrates, that have the same dielectric constant 2.47 (PTFE-quartz) in which upper substrate is a rectangular patch. The microstrip patch is fed by a microstrip line which is printed on lower substrate, through an aperture or slot in the common ground plane of patch and microstrip feed. This antenna is analyzed by using Finite Difference Time Domain (FDTD) method the specific design frequency 10 GHz and match impedance is 50 ohms. The simulation results of its characteristics are input impedance, return loss, VSWR and radiation patterns respectively.

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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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Broadband polarimetric Microstrip Antennas for Space-borne SAR

  • Hong, Lei;Qunying, Zhang;Guang, Fu
    • Proceedings of the KSRS Conference
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    • pp.465-470
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    • 2002
  • A novel phased array antenna system for space-borne polarimetric SAR is proposed and completed in this paper.The antenna system assures polarimetric and multi-mode capability of SAR. It has broadband, high polarization isolation and high port to port isolation. The antenna system is composed of broadband polarimetric microstrip antenna, T/R modules and multifunction beam controller nit. The polarimetric microstrip antenna has more than 100MHz bandwidth at L-band with -30dB polarization isolation and high port to port isolation. The microstrip element and T/R module's structure and characteristics, the subarray's performances measuring results are presented in detail in this paper. A design scheme on beam controller of the phased array antenna is also proposed and completed, which is based on Digital Signal Processing (DSP) chip -TMS320F206. This beam controller unit has small size and high reliability compared with general beam controller. In addition, the multifunction beam controller unit can acquire and then send the T/R module's working states to detection system in real time.

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