• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.2
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• pp.99-108
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• 2018

This paper presents a design study of a solid state power oscillator to replace the conventional magnetron. The operational conditions of a single-stage 300 W LDMOS power amplifier were fully characterized. The power module consisted of two amplifiers connected in parallel. A delay-line feedback loop was designed for self-oscillation. A phase shifter was inserted in the delay-line feedback loop for adjusting the round-trip phase. Experiments performed using the power oscillator showed an output power of 800 W and a DC-RF conversion efficiency of 58 % at 2.327 GHz. The measured results were in good agreement with those predicted by numerical simulations.

• Journal of Broadcast Engineering
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• v.8 no.2
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• pp.116-125
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• 2003

In this paper, we introduce a newly developed DSP module and Software which Is applicable to DTV-OCR and is designed to cancel the interference signal. In general, RF repeater has problems of system oscillation and signal Quality degradation due to feedback interference signal coming from transmit antenna. In this paper, we demonstrate newly developed DSP HW and SW module for cancelling the interference signal by investigating the field data measured through a RF repeater. Also, the structure and signal processing method for non-regenerative repeater system based on the newly developed DSP HW and SW module is illustrated as well.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2002.11a
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• pp.165-168
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• 2002

Accurate circuit simulation models for embedded RF passive components in LTCC provide a way to efficiently design high performance RF modules. Particularly, consideration of unavoidable parasitic components is required certainly. In this study, the parasitic components which is appeared from 3-D structure is considered.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.2
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• pp.178-182
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• 2011

A FSK receiver RF block has been developed for Dubaisat-1 Low Earth Orbit satellite. The receiver has Doppler tracking function which compensate frequency shift on uplink channel for commanding the satellite. It consist of LNA, downconverter and IF module. The IF module has Doppler tracking circuitry which sweep and lock on to input signal. It satisfies the requirement of the Dubaisat-1 in mass, power consumption, tracking speed and BER performance.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.2
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• pp.154-161
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• 2011

This paper presents a compact integrated transceiver module for 2.4 GHz band applications using Low Temperature Co-fired Ceramic(LTCC) technology. The implemented transceiver module is divided into an RF Front-End Module (FEM) part and a transceiver IC chip part. The RF FEM part except an SPDT switch and DC block capacitors is fully embedded in the LTCC substrate. The fabricated RF FEM has 8 pattern layers and it occupies less than $3.3\;mm{\times}5.2\;mm{\times}0.4\;mm$. The measured results of the implemented RF FEM are in good agreement with the simulated results. The transceiver IC chip part consists of signal line, power line and transceiver IC for 2.4 GHz band communication system. The fabricated transceiver module has 9 layers including three inner grounds and it occupies less than $12\;mm{\times}8.0\;mm{\times}1.1\;mm$. The implemented transceiver module provides an output power of 18.1 dBm and a sensitivity of -85 dBm.

• Journal of Navigation and Port Research
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• v.26 no.4
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• pp.419-426
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• 2002

The conventional RTK-GPS technique has many problems which are permission using RF wireless modem, influence of geographic obstacle using radio wave, frequency interference, finiteness of frequency resources. To solve these problems, in this paper, we designed the DGPS correction message transmission system as a method to substitute the RF wireless modem of RTK-DGPS receiver. Then the interface module was designed and implemented for linkage of GPS receiver and mobile phone. As a result worked differential surveying using receiving correction message using RS-232C and communication control, users of mobile station were worked differential surveying correction between mobile phones. Interface module system was received the same result of precision which was compared RF wireless modem system.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.118-118
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• 2003

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.526-528
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• 2004

본 논문은 센서 네트워크 환경에서 사용자 센싱을 통한 입력장치인 MGlove (Multiple-sensing Clove)의 구현에 대해 기술한다. 본 입력장치는 버튼 없이 2축 가속 센서, 2축 자기 센서, 포토 다이오드의 세 가지 종류의 센서를 사용하여 사용자의 손동작을 통해 입력을 감지하고 RF 모듈을 이용하여 무선으로 통신 가능하다. 구현한 MGlove는 유비 쿼터스 센서 네트워크 환경을 위한 입력 장치로 context-aware input device로의 발전 가능성이 있으며, 센서 추적 기법을 통해 사용자의 자세, 위치, 방향에 관계없이 입력 가능하고 RF모듈을 통해 먼 거리에서도 조작이 가능한 특징을 가진다.

• Journal of the Microelectronics and Packaging Society
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• v.2 no.2
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• pp.19-30
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• 1995

일반적으로 마이크로 웨이브 영역에 사용되는 마이크로스트립 전송로는 후막 전도 선을 이용하여 RF 모듈을 구현할수 있으나 선폭의 고해상도가 전체 특성에 큰 영향을 미치 므로 고정도의 박막을 이용한 RF 모듈이 많이 개발되고 있다. 따라서 본 논고에서는 박막 제조기술을 이용하여 마이크로 웨이브 하이브리드의 한 종류인 WILKINSON 전력 분배기 를 개발하였고 공정 변수를 최적화함으로써 고특성 고신회성의 전력 분배기를 구현할 수 있 었다. 먼저 전도선의 두께의 영향을 고찰하였으며 제조 공정에 있어 GROUND 방법 /HOUSING 형상을 개선함으로써 용이하게 전력 분배기를 제조하였다. 마지막으로 MIL 규 격에 따른 전력분배기의 신뢰성 시험 항목을 제시하였고 이에 따라 정격 전력을 계산, 측정 하였다.

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.101-104
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• 2011

본 논문에서는 FOB Key Smart Key System module 간의 원할한 통신을 위한 실차 테스트를 하였으며, 실차 테스트를 위한 데모 모듈레이션 구성은 물론 각 모듈간의 통신상태및 최적의 통신 상태를 위한 3차원 그리드 형태의 실험준비를 하였고 최적의 감도를 얻기위한 수천번의 실차 테스트를 실시하였다.