Title :
An investigation of performance enhancement for tunable microstrip filter
Author :
Ni, Jia ; Tang, Wenxing ; Hao, Zhang-Cheng ; Hong, Jiasheng
Author_Institution :
Dept. of Electr., Electron. & Comput. Eng., Heriot-Watt Univ. Riccarton, Edinburgh, UK
Abstract :
This paper reports an investigation of performance enhancement for electronically tunable microstrip filter. Based on the effects of lossy components on passband response of a bandpass filter, a new concept to improve the performance (passband flatness and selectivity) is proposed. Unlike other techniques published, this new concept results in nonuniform Q distribution by loading lumped elements to reduce the unloaded Q of the resonator. As examples, fixed and tunable microstrip combline filters with narrow band are simulated and fabricated to validate the proposed concept.
Keywords :
band-pass filters; comb filters; microstrip filters; resonator filters; band-passfilter; fixed microstrip combline filters; lumped elements; nonuniform Q distribution; passband response; resonator filter; tunable microstrip combline filters; Band pass filters; Filtering theory; Microstrip filters; Microwave filters; Passband; Resonator filters; Filter predistortion; lossy circuit; nonuniform Q distribution; tunable microstrip filter;
Conference_Titel :
Microwave Conference (EuMC), 2011 41st European
Conference_Location :
Manchester
Print_ISBN :
978-1-61284-235-6
