• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.265-269
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• 2005

In this paper shows the Designed active antenna for wireless LAN that is consisted of 5.5GHz band local LNA and Microstrip Patch Antenna. LNA improved noise special quality using NEC company's NE3210S01 and Microstrip Patch Antenna designed to have omnidirectional characteristic. Designed Microstrip Patch Antenna expressed omnidirectional characteristic special quality having gains of about 8.3dBi. LNA gains 15dB, noise index showed special quality under 1 dB.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.12A
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• pp.1183-1187
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• 2005

In this paper, a weathercock-shaped microstrip patch antenna for application in 5.25GHz band wireless LAN is designed and fabricated. To obtain sufficient bandwidth in VSWR<2, the T-slot is inserted on the patch, the coaxial probe source is used. The measured result of fabricated antenna obtained 350MHz or about $7.62\%$ bandwidth in VSWR<2 referenced to the center frequency, the gain of 5.25${\~}$6.70dBi. The experimental 3-dB beam width is shown to be broad across the pass band in azimuth and elevation at $80.32^{\circ}$ and $83.88^{\circ}$, in several.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2001.11a
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• pp.29-35
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• 2001

Combline 구조를 가진 마이크로 스트립 라인 또는 스트립 라인 필터를 내장한 기능형 PCB를 제작하였다. 저 비용 구현 및 이동성과 휴대성을 강조하기 위해 기존의 세라믹 대신 FR4와 에폭시를 유전체로 사용하는 저가형 다층 회로 기판의 도체 층에 집적화 하였다. Combline의 각 끝단에 커패시터를 부하함으로써 전기적 길이를 확장하였고 전체적인 크기를 감소시킴으로서 적당한 필터 특성을 얻을 수 있었다. 구현된 Embedded PCB는 마이크로파 대역에서 사용 가능하며 특히 Bluetooth 나 Wireless LAN과 같은 ISM 대역을 사용하는 무선통신소자로서 사용 가능하다.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2003.11a
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• pp.226-229
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• 2003

본 논문은 Wireless LAN 주파수 대역$(5725\~5825\;MHz)$에서의 다차원패턴기술(Photonic Band Gap : PBG)을 이용한 Yagi-Uda 안테나와 결합하여 광대역 마이크로스트립 패치 안테나를 구현 하였으며, PBG Cell을 이용한 안테나와 이용하지 않은 안테나를 비교 분석하였다. PBG 구조를 적용한 안테나에서의 대역폭이 약 30 MHz 정도 더 넓게 나왔으며, 안테나의 이득은 -1dB정도 더 낮게 나왔는데 이는 Ground 면에 2차원적인 PBG Cell을 적용한 효과 때문으로 분석된다.

• Journal of the Microelectronics and Packaging Society
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• v.4 no.2
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• pp.79-83
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• 1997

본 연구에서는 휴대용 전화기 및 무선 LAN 의 핵심부품인 RF-Switch Module의 초소형화 설계기술, 표면실장기술, 고주파설계기술, 소형화 SMD기술, Test 기술 및 RF-Switch Module 활용기술 등을 개발하였으며 RF-Switch Module의 설계기반 마련 및 대외 경쟁력 있는 RF-Switch Module의 초소형화 기술을 확보하였다.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.06a
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• pp.196-197
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• 2004

• Journal of Advanced Navigation Technology
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• v.10 no.4
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• pp.326-332
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• 2006

In this study, the antenna was proposed for the omni-directional characteristic in horizontal plane. Therefore we proposed $1{\times}4$ microstrip patch array on cylindrical surface for studying microstrip patch antennas. This antenna is designed for 2.45GHz ISM band and applications. This antenna can be applied to the base station of wireless microphone and access point of wireless LAN. The length and width of the patch antenna and the width of the feed line were calculated by using the theory of microstrip patch antenna, by using the both the 2.5D and 3D EM simulators the optimized antenna characteristics are obtained. From result of measured, antenna's impedance of coaxial waveguide port was 51.915-j3.688 ${\Omega}$, the return loss was -31dB and VSWR was 1.081.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.133-136
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• 2008

In this paper, the parallel coupled line(PCL) band-pass filter satisfying IEEE 802.11a (a:$5.15{\sim}5.25$, b:$5.25{\sim}5.35$, c:$5.725{\sim}5.875$ [GHz]) has been designed for 5[GHz]band W-Lan RX-System applications. The designed PCL Band-Pass filter is of advantage to make a design formula that is small, light and approximate accuracy. It choose a microstrip plane figure because it is possible that a multiplicity of resonator was designed. It was shown that bandwidth was 14% from 5.15GHz to 5.92GHz at the -3dB designed filter. As a result, it is enough to use the designed filter at W-LAN RX-system of the 5GHz band.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.9 no.4
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• pp.153-156
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• 1984

A local area network(LAN) controller is designed according to non-persistent CSMA protocols. By meas of a buffer register, a microcomputer interfaces with the LAN controller. To keep bus utilization near the optimal efficiencies, the transmission intervals are adjusted as a function of $2^n$. A message in the form of a packet consisting of 128bytes is transitted to the bus. The maximum transmission rate of 19.2Kbps is obtained at layer 1.

• 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］