• Title/Summary/Keyword: Microstrip antennas

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Triangular Microstrip Antenna with T-type Slot (T형 Slot을 삽입한 삼각형 안테나)

  • Park, Byoung-Woo;Shin, Hye-Jung
    • The Journal of the Korea Contents Association
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    • v.7 no.7
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    • pp.24-30
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    • 2007
  • This paper observed characteristics of a triangular microstrip patch antenna with T-slot. When a narrow horizontal slot or vertical slot is embedded in a triangular microstrip antenna, we investigated variations of dual resonant frequency according to slot lengths and then we could make a triangular microstrip antenna with T-type slot suitable to a very low dielectric substrate. The proposed antennas used a dielectric substrate which has relative dielectric constant ${\epsilon}_r=3.38$ and a height of 8 [mils] (=0.2032mm) and antenna characteristics of horizontal or vertical slot antennas are compared by a ensemble 8.0 simulator. Theoretical and experimental results of manufactured antennas are compared.

Design of Patch Antennas using FEM (유한요소법을 이용한 패치안테나의 설계에 관한 연구)

  • 한재봉;황재호
    • Journal of Korea Society of Industrial Information Systems
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    • v.9 no.2
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    • pp.74-80
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    • 2004
  • This paper presents analysis and design for Microstrip antennas using FEM (Finite Element Method). For the miniaturization of the antennas, dielectric substrate (ε/sub r/=4.6) and rectangular patch structure are used. The proposed Microstrip antennas are simulated using commercial simulator (HFSS). The results of the simulation are presented and compared with characteristics of each array type. Especial, the proposed antennas can be applied to the design of various communication systems for 2.4 GHz band.

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A Small Microstrip Patch Antenna (소형 마이크로스트립 패치 안테나)

  • 장순범;박동국
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.4
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    • pp.351-355
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    • 2003
  • In this paper, rectangular patch antenna is miniaturized by changing the middle of patch into narrow microstrip line except the edges of the patch where the fringing field occurs. Miniaturized rate, gain, bandwidth, radiation pattern of suggested antennas were compared with general square and rectangular microstrip antennas by using simulator Ensemble. As a result, it reduces the dimension of antenna by 44 % and improves the characteristic of x-pol by 40 dB as an advantage when compare with square microstrip antenna while it reduces bandwidth.

The Design of a K-Band 4$\times$4 Microstrip Patch Array Antennas with High Directitvity (고지향성 구현을 갖는 K-밴드 4$\times$4 마이크로스트립 패치 어레이 안테나의 설계)

  • Lee, Ha-Young;Kim, Hyeong-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.1
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    • pp.161-166
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    • 2007
  • In this paper, two 4$\times$4 rectangular patch array antennas operating at 20 GHz are implemented for the satellite communication. The sixteen patch antennas and microstrip feeding line are printed on a single-layered substrate. The design goal is to achieve high directivity and gain by optimizing design parameters through permutations in element spacing. The spacing between the array elements is chosen to be 0.736$\lambda$. Numerical simulation results indicate that the HPBW(Half-Power Beam Width) of the 4$\times$4 patch array antenna is 18.78 degrees in the E-plane and 18.48 degrees in the H-plane with a gain of 17.18 dBi. Numerical simulations of a 4$\times$4 recessed patch array antenna yield a HPBW of 18.71 degrees in the E-plane and 17.82 degrees in the H-plane with a gain of 19.43 dBi.

A Study on the Radiation Characteristics of Microstrip Array Antennas on the Nonplanar Surface (곡면에서의 마이크로스트립 어레이 안테나의 복사 특성에 관한 연구)

  • 구연건;이정수;고광태
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.2
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    • pp.121-136
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    • 1989
  • In this paper, an attempt has been made to analyze the theoretically and verify experimentally the effect of curvature on the radiation characteristics of microstrip array antennas mounted conformally on the concave surface and the convex surface of the cylindrical body. The analysis of single element microstrip antenna is made by using the analysis method of Transmission Line Model. The theory of array antennas is established by application of the method of transformed coordinates, in which the translation and the ratation about each single element arrayed two-demensionally on the nonplanar surface are under consideration, and it is investigated by computation of the synthetic electric field strength in the far zone. In addition, various radiation characteristics, such as return loss, resonant frequency, radiation pattern, half-power, beamwidth, gain, are measrued and compared with the theroetical values according to the variation of curvature, by designing and building 4-element array microstrip antenna operating at 10 GHz, and microstrip feed lines. As predicted in theroy, it is verified that radiation pattern of antennas mounted on the concave and the convex surfaces alike broadens as the radius of curvature decreases. And for the curved surfaces, aggrement between computed values of the total synthetic radiation power pattern by the method of transformed coordinates and measured valuse is good. Besides, it is found that resonant frequency, input impedance and gain are hardly affected by the radius of curvature.

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An Analysis of Arbitrarily Shaped Microstrip Antennas Using Transmission - Line Matrix Representation and Moment Methods (전송선로의 매트릭스 표현법과 모멘트법을 이용한 임의 형태를 갖는 마이크로스트립 안테나의 해석)

  • 조원서;김정기
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.2 no.2
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    • pp.11-18
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    • 1991
  • In this paper, the analysis of arbitrarily shaped microstrip antennas is described. The analysis method is based on the transmission - line matrix representation for the interior problem and the moment method for the problem along the peripheries of the patch. Using this method, the input impedance and other antenna parameters are calculated and compared with experimental results for a circular and an equilateral triangular microstrip antenna. For all of the results, theoretical and expreimental results are in good agreement and the validity of the method is confirmed. This analysis can also be used to analyze microstrip antennas with shorting pins.

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The Analysis of Arbitrarily Shaped Microstrip Patch Antennas using the MPIE (MPIE를 이용한 임의의 형상을 갖는 마이크로스트립 패치 안테나의 해석)

  • 정대호;김태원;김정기
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.8
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    • pp.1059-1068
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    • 1993
  • We will put the emphasis on the analysis of arbitrarily shaped microstrip antennas. The most general and rigorous treatment of microstrip antennas is given by the electric field integral equation(EFIE), usally formulated in the spectral domain. In this paper, we use a modification of EFIE, called the mixed potential integral equation(MPIE) , and we solve it in the space domain. This technique uses Green's functions associated with the scalar and vector potential which are calculated by using stratified media theory and are expressed as Sommerfeld integrals. The integral equation is solved by a moment's method using rooftop subsectional basis function. Thus, microstrip patches of any shape can be analysed at any frequency and for any substrate. Numerical results for a rectangular patch and for a L-shaped patch are given and compared with measured values.

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A Study on the Feed Network for Microstrip Array Antenna (마이크로스트립 배열 안테나의 급전 방식에 관한 연구)

  • 안계선;안우영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.9
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    • pp.1739-1747
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    • 1994
  • This study is concerned with a feeding method of microstrip patch antennas with different widths as feeding elements in order to obtain the appropriate radiation patterns of nonuniform array antennas. We analyze a microstrip patch antenna based on the transmission line model and derive that the ratio of current is equal to that of the input impedances of array antenna elements in case that the feed-line length between elements of array antenna is equal to the integer times of $\lambda_g$. We measure the radiation patterns of the nonuniform microstrip patch array antenna with 6 and 9 elements. The patterns measured are well agreed with the theoritically calculated patterns. Thus, this result can be utilized in the implementation of a feed network in nonuniform array antennas.

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A Study on Wideband Microstrip Array Antennas Using the Parallel Coupled Lines (펑행 결합 선로를 이용한 광대역 마이크로스트립 배열 안테나에 관한 연구)

  • 김정일;한만군;윤영중
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.12B
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    • pp.1724-1732
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    • 2001
  • In this paper, a technique for increasing the bandwidth of microstrip array antennas using the parallel coupled lines on a single layer is presented. Four types of wideband microstrip array antenna are designed and the characteristics of each type are analyzed. In addition, an iterative method using a distributed network is proposed to design the parallel coupled lines as a wideband impedance matching network. Measurements show that the proposed antennas provide wider bandwidths ∼1.7 times those of conventional microstirp array antennas, while the sizes of proposed antennal are the same as that of a conventional array. And low cross-polarization level can be obtained through symmetrical locations of the parallel coupled lines section

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