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.
|Number of pages||6|
|Journal||IEEE Transactions on Microwave Theory and Techniques|
|State||Published - 1 Dec 1990|
|Event||1990 IEEE MTT-S International Microwave Symposium - Dallas, TX, USA|
Duration: 8 May 1990 → 10 May 1990