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Anti-Phase IMD 선형화 기술을 이용한 W-CDMA 30 W 대전력 증폭기
강원태,도지훈,장정석,홍의석,Kang, Won-Tae,Do, Ji-Hoon,Chang, Jeong-Seok,Hong, Ui-Seok 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7
본 논문에서는 구동단의 IMD 특성을 종단의 IMD 특성과 반대의 값을 갖도록 하는 anti-phase IMD 정합 기법을 이용하여 대전력 증폭기의 선형성을 개선하였으며, 이의 설계 과정을 나타내었다. W-CDMA 4FA 입력 신호시 평균 출력 전력 30 W에서 ACLR -55 dBc@5 MHz offset을 얻었으며, 최대 전력 이득을 얻기 위한 최적 정합시와 측정 결과를 비교시, 약 12 dBc 이상 개선되었다. 또한, 평균 출력 전력 50 W에서도 상용 제품 규격을 만족함을 보였다. This paper shows how the ACLR of power amplifier can be reduced by using Anti-phase IMD linearization technique which generate anti-phase IMD in the driver stage compare to output stage's IMD. And design process proposed. From the experimental result of W-CDMA 4FA input signal, this amplifier has ACLR -55 dBc@5 MHz offset at 30 watts average power. Compare to optimum matching technique to get maximum power gain, this technique has been improved ACLR by 12 dBc. Also this amplifier meets 50 watts average output power amplifier specification in domestic market.
원형실린더를 이용한 Magnus 효과 추진 장치의 설계 및 제작
윤정호(Jung Ho Yoon),강원태(Won Tae Kang),김대호(Dae Ho Kim),박기현(Ki Hyun Park),신병록(Byeong Rog Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Recently oil prices are rising day by day, and the costs of energies are extremely expensive. Because of this situation, in this project, one of the fundamental natural resources, wind power, is taken into account to make a driving force instead of generating the force with petroleum energies. Magnus effect caused by the rotating circular cylinder is applied to design and make a wind propulsion system The principle of Magnus effect is to get a driving force by pressure differences on the surface of rotating circular cylinder in the wind. As the results fluid dynamic force toward low pressure from high pressure is occurred. Through this project we could get more knowledge of fluid dynamics such as Bernoulli equation and the theory of Magnus effect. This knowledge and experience will be pretty useful in a design of devices working with a green energy in future and now.