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An RF Amplitude Equalizer ; Improved Passband Flatness of a Bandpass Filter
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  • An RF Amplitude Equalizer ; Improved Passband Flatness of a Bandpass Filter
  • An RF Amplitude Equalizer ; Improved Passband Flatness of a Bandpass Filter
저자명
Hwang. Hee-Yong,Jung. -Seong,Yun. Sang-won
간행물명
Journal of the Korea Electromagnetic Engineering Society
권/호정보
2001년|1권 1호|pp.83-87 (5 pages)
발행정보
한국전자파학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

Many communication systems require bandpass filters with sharp skirt frequency characteristics in order to avoid the interferencce, which results in more order in the filter design. However, because of the limited Q values bandpass filters made of small sized ceramic resonators suffer from relatively large ripples at the band edges as the order of the filter increases. In order to compensate the large ripples while maintaining the sharp skirt frequency we propose a new RF amplitude equalizer. The equalizer made of two pole bandpass filter and an amplifier whose amplitude characteristics are the reverse of those of the bandapss filter. At the cellular band 9-pole bandpass filter with 10 MHz bandwidth exhibits 3 dB ripple when 8mm*8mm ceramic coaxial resonators are used. We added the RF equalizer to this filter and the flatness is improved as less than 1 dB.