Analysis of Dual-Band Bandpass Filters with Improved Stopband Rejection

• Main Authors: Chin-HaoKuo, 郭晉豪
• Other Authors: Chih-Ming Tsai
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/90946472099175097959

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 103 === A modified algorithm is proposed in this study to solve the problem of the current syntheses that the ripple levels of both passbands do not match while most realized dual-band filters do have same ripples. The stopband rejection of filters may be compromised because of these uncontrolled ripples. Furthermore, such modification allows stopband responses could be more conveniently compared. Also a structure which could exactly introduce extra transmission zeros is presented. Several rejection diagrams of dual-band filters are generated to help designers to assess the stopband responses at the start of their synthesis procedures.