• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.7
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• pp.567-575
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• 2014

This paper suggests an installation procedure of a smart skin prototype into an aircraft, flight demonstration test procedures and test results. Four communication and navigation antennas are embedded into one Conformal Load-bearing Antenna Structure(CLAS). Log periodic patch type antenna was designed as a multi-band antenna to cover four antenna frequency bands. The requirements of CLAS were verified by ground tests before aircraft installation. A CLAS speed-brake was installed into KT-1 aircraft and performances of dual antennas were verified as multi-antenna tests on the ground. Electromagnetic compatibility tests were conducted to check compatibility between the CLAS and all existing equipments. Flight demonstration tests were conducted by one sortie of flight test for one antenna. The activeness and continuity of communication and navigation signal during the flight, null area of antenna signal along the circling flight were monitored. The embedded antennas worked better than expected during four sorties of flight tests.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.3
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• pp.508-512
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• 2007

In this paper, a novel wideband crossed planar monopole antenna with the double resonance characteristics is proposed. The proposed monopole antenna consists of a wideband crossed planar monopole antenna and L-shaped slits. In order to generate double resonance characteristics on the proposed monopole antenna, the length of L-shaped slit on the antenna surface is obtained from the quarter-wavelength of the second resonance frequency The double resonance characteristics of the proposed antenna can be easily designed by the control of length of L shaped slit at an interesting frequency. The proposed antenna having an omnidirectional radiation pattern and a high gain over the double resonance frequency bands, respectively, is suitable for mobile multiband antenna.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.542-545
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• 2003

An microstrip array antenna is designed based on the Sierpinski equilateral triangular patch. The Sierpinski geometry is composed of 3 equilateral triangular patch and is easy to generate a circular polarization by sequential rotation array techniques. This 1${\times}$3 Sierpinski equilateral triangular patch antenna is extended to 8${\times}$8 array antenna for satellite broadcasting receptions.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2001.11a
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• pp.82-85
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• 2001

본 논문에서는 S밴드(2-4 GHz)와 C밴드(4-8 GHz)에서 사용가능한 비동심원 복사구조와 저임피던스 급전구조를 갖는 광대역 원형 링슬롯 안테나를 제안하였다. 본 안테나는 유전율 4.3, 두께 1mm의 기판을 대상으로 해석되었다. 재안된 안테나의 계산된 임피던스 대역폭은 122%(S$_{11}$$\leq$-10 dB)이므로 기존의 원형 링슬롯 안테나보다 훨씬 광대역이다. 또한 주요 설계변수들을 변화시켰을 때 변경되는 안테나의 특성을 연구함으로써 최적화설계에 도움이 되도록 하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.11
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• pp.1940-1945
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• 2006

The small and wideband annular ring slot antenna with eccentric radiating structure and low impedance feedline is presented. This antenna is analyzed by using substrate with permittivity 4.3 and thickness 1mm. As the measured impedance bandwidth of proposed antenna is $118%(S_{11}{\leq}-10dB)$, its bandwidth is much broader than that of conventional annular ring slot antenna.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.576-579
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• 2007

마이크로스트립으로 급전되는 슬롯 안테나를 소형화하기 위해 폴디드 슬롯과 T형 마이크로스트립 선로로 구성된 안테나 구조를 제안하였다. 전형적인 마이크로스트립으로 급전된 슬롯 안테나와 성능(안테나 크기, 슬롯 길이, 대역폭 등)을 비교하였으며, T형 마이크로스트립선로를 이용한 급전선로의 임피던스정합 방법에 대하여 설명하였다. 제안된 구조로 유전제기판상에 2.45GHz 대역 WLAN용 안테나를 설계 및 제작하였으며 특성 실험(반사손실, 부사패턴)을 통해 연구의 타당성을 확인하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.163.2-163.2
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• 2013

플라즈마 시뮬레이션을 이용하여 디스플레이 공정용 안테나 유도 결합 플라즈마 시스템에서의 플라즈마 변수들에 대한 공간분포를 살펴 보았다. 디스플레이 공정용 챔버 규격은 8세대, 안테나의 turn수는 4turn을 기본으로 하여 안테나 코일의 분할을 각각 4개 분할, 9개 분할로 구분하여 시뮬레이션을 진행한 결과 안테나 배치의 차이에 의한 플라즈마 밀도, 온도, 전위차의 공간분포의 균일도의 차이를 확인 할 수 있었다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.3
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• pp.233-238
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• 2013

In this paper, a novel diversity and directivity mode-switchable planar antenna array is proposed. For the diversity mode, four elements are unfolded on the plane and high isolation can be achieved. On the other hand, the antenna function is changed to the directivity mode when they are folded and stacked. Each element works such as a stacked Yagi-Uda antenna with high directivity. Especially, the curved feed line as well as the hybrid feeding method is used to improve performances. The simulation results agree well with measurement results and it is successfully demonstrated that two modes are properly working at 2.4 GHz.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.4
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• pp.25-30
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• 2010

Our new metamaterial structure patch antenna improves the gain of ordinary metamaterial patch antenna. The structure of new metamaterial cover is made by removing central $7{\times}7$ lattices out of $9{\times}9$ lattices. Also, the metamaterial covers can be easily fabricated using ordinary substrates. Measurement results of a patch antenna, a metamaterial patch antenna and our proposed metamaterial patch antenna show that the gain of the proposed metamaterial patch antenna is about 3dB higher than that of the ordinary metamaterial patch antenna.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.8
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• pp.119-124
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• 2004

In this paper, we are designed and fabricated circular polarization microstrip patch antenna of 5［GH］z bandwidth for the wireless LAN and the ISM. We are proposed new structure that removed the section which intersected at a right angle and were composed to four separated slots. The antenna of proposed structure could solve parasitic elements from intersected in a right angle and weak coupling efficiency from asymmetry between feed line and a slot. The proposed cross slots antenna is easily impedance matching and increased impedance bandwidth. Also this is increased efficiency and a bandwidth of antenna and reduce back lobe of radiation pattern. We designed 2${\times}$2 array antenna of 5［GHz］ band. It took impedance bandwidth 280［MHz］(VSWR < 1.5) and gam 12.5［dBi］