Microwave active filters based on coupled negative resistance method

Chi-Yang Chang*, Tatsuo Itoh

*Corresponding author for this work

Research output: Contribution to journalConference article

87 Scopus citations


A novel coupled negative resistance method for building a microwave active bandpass filter is introduced. Based on this method, four microstrip line end-coupled filters were built. Two are fixed-frequency one-pole and two-pole filters, and two are tunable one-pole and two-pole filters. In order to broaden the bandwidth of the end-coupled filter, a modified end-coupled structure is proposed. Using the modified structure, an active filter with a bandwidth up to 7.5% was built. All of the filters show significant passband performance improvement. Specifically, the passband bandwidth was broadened by a factor of 5 to 20.

Original languageEnglish
Pages (from-to)1879-1884
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
StatePublished - 1 Dec 1990
Event1990 IEEE MTT-S International Microwave Symposium - Dallas, TX, USA
Duration: 8 May 199010 May 1990

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