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Microwave active filters based on coupled negative resistance method

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2 Author(s)
Chi-Yang Chang ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA ; Itoh, T.

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

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:38 ,  Issue: 12 )

Date of Publication:

Dec 1990

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