• 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.

• Journal of the Korean Institute of Telematics and Electronics
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• v.27 no.11
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• pp.25-31
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• 1990

We analyze the spherical-rectangular patch microstrip resonator with conformal surface by the cavity model and derive the formulas to calculate resonant frequency in the consideration of effective dielectric constant in order to minimize the errors of resonant frequency due to the fringing fields. A transmission type spherical-rectangular patch microstrip resonator operating at 3GHz, for example, is designed and fabricated on Epsilam-10 substate. Measuring data of resonant frequency and return loss are 2.985 GHz and -44.4dB respectively. Those well agreed with theoretical values.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.4
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• pp.817-821
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• 2001

In this paper, we design a microstrip patch antenna using 3-dimensional microstrip transition with the VSWR 1.3 over the PCS band (1.75 -1.87 GHz). We study experimentally the effect of the antenna parameters on antenna input impedance. And using the proposed antenna, we fabricate a polarization diversity any antenna and discuss the possibility of antenna for PCS base station.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.74-75
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• 2016

Various types of microstrip antennas can be used for many applications in wireless communication systems. In this paper, we studied a design method for a broadband dual-fed stacked microstrip patch antenna. The impedance bandwidth is improved by adjusting the sizes of main radiating patch and parasitic patch, the distance between the patches, the length of inset feed line, etc. The antenna is designed by simulation for an operation in the frequency range of 2.3-2.7 GHz, and the antenna characteristics such as return loss, gain, radiation patterns are examined.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.2 s.54
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• pp.22-31
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• 2005

최근 무선통신 시스템의 소형화로 인해 안테나의 소형화가 요구되고 있다. 안테나의 소형화 방법에는 여러 가지가 있지만 이득과 효율을 고려할 때 고유전율의 유전체를 사용하기보다는 안테나 자체의 구조적 변형을 통해 안테나를 소형화하는 것이 더 효과적이다. 따라서, 본 논고에서는 마이크로스트립 안테나의 2차원 구조 변형과 3차원으로 화장된 구조변형에 의한 안테나의 소형화 방법에 대한 연구 결과에 대해 기술하였다. 2차적 구조 변형 방법에는 패치를 구부리거나 slit을 넣는 방법을 사용하여 그 크기를 축소시켰으나 소형화에 한계가 있었다. 그래서, 마이크로스트립 안테나의 패치와 접지면 사이의 공간을 활용하는 perturbation 효과를 바탕으로 3차원의 corrugation, iris, folded 구조를 이용하여 더욱 소형화된 안테나를 설계하였다. 또한, 2차원 구조의 소형화 방법에 3차원으로 확장한 구조를 서로 결합하여 안테나를 더욱 소형화 할 수 있었다. 이에 마이크로스트립 안테나의 소형화 방법과 그에 따라 설계·제작한 안테나에 대해 소개하고자 한다.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.285-289
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• 2002

In this paper, microstrip line-probe feeding patch array antenna with center frequency 5.8㎓ is designed and manufactured. The microstrip line - probe feeding structure has broadband characteristic and be able to modify the array structure for improving antenna gain. In this result, microstrip line-probe feeding patch array antenna has 17.6% bandwidth and 8㏈i antenna gain, respectively.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.7B
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• pp.875-879
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• 2001

마이크로스트립 패치안테나의 대역을 증가시키는 방법이 꾸준히 연구되고 있다. 본 연구에서는 구형 패치 구조에 기생 소자를 더한 형태로 구형 패치 외부에 바(bar)와 밴드(band) 모양의 기생소자를 설치하여 프린징 효과를 최소화 하고자 하였으며, 이로 인한 안테나 효율의 향상과 대역폭을 증가를 시키고자 하였으며, 또한 기생소자의 폭과 방사안테나의 간격을 조절하여 대역폭과 임피던스정합 특성의 변화를 해석하였다. 이를 이용하여 LMDS통신 주파수 대역인 24.6GHz∼28.5GHz에서 공진 대역을 갖도록 설계하였다. 정재파비 2.0 이하를 기준으로 기존의 패치안테나의 중심주파수에 대한 대역 이용율이 수 %인데 반하여, 본 연구에서 제시한 밴드를 설치한 구조의 경우 12.92%로 증가함을 알 수 있고, 또한 본 연구에서 제시한 외부 밴드를 갖는 구조가 급전선로와 패치 안테나와의 정합특성이 월등함을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.12
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• pp.139-145
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• 2008

In this paper, a microstrip surface wave antenna(SWA) with a frequency selective surface structure(FSS) is designed and measured. A microstrip SWA has many advantages such as low profile, low weight, easy fabrication, and compatibility with monolithic microwave integrated circuits(MMIC). In addition, it has demonstrated monopole like beam patterns. The microstrip SWA consists of two parts : a center-fed modified microstrip patch to excite surface wave, and a periodic patches to support the propagation of the surface waves. To obtain wide bandwidth, the ring type parasitic element is inserted and the circular patch is selected for the unit element in FSS structure. Experimental results show that the microstrip SWA has monopole like beam patterns at 5.9GHz. Impedance bandwidth and gain is 12% and 5.6dBi.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.3
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• pp.171-175
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• 2013

In this paper was The dielectric constant of 4.4 and thickness of 0.6mm FR-4 substrate were implanted including the L-Slot in microstrip patch antenna to design a microstrip patch antenna for LTE. The proposed antenna is $180{\times}180$ compact and $46{\times}36$ lightweight compared to existing antenna and This antenna can be used as transmission ommidirectional radiation pattern of propagation was compared to the input return loss than -10dB (VSWR 2:1) to allow communication from the resonant frequency band.

• 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.