Title :
Design of a switchable selectivity bandpass filter based on diode-loaded resonators
Author :
Pu-Hua Deng ; Yu-Ta Chen ; Ren-Chuan Liu ; Shih-Fong Chao ; Li-Chi Dai
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Kaohsiung, Kaohsiung, Taiwan
Abstract :
This study utilizes coupled-line feed structure and diode-loaded resonators to realize a switchable selectivity microstrip bandpass filter. The different selectivity in the proposed circuit is controlled by switching between a second-order filter and a fifth-order filter. Because the feed line near input or output port is shared by the two filters designed at the same center frequency, the diode-loaded resonator in each filter is arranged near input or output feed line to avoid loading effect on each operating mode while switching the proposed circuit. An implemented switchable selectivity filter with high isolation to desired blocking circuit is successfully validated in this paper.
Keywords :
band-pass filters; microstrip filters; resonator filters; blocking circuit; center frequency; coupled-line feed structure; diode-loaded resonators; fifth-order filter; input feed line; input port; loading effect; operating mode; output feed line; output port; second-order filter; switchable selectivity bandpass filter; switchable selectivity filter; switchable selectivity microstrip bandpass filter; Band-pass filters; Chebyshev approximation; Filtering theory; Microwave filters; Resonator filters; Switches; Switching circuits; Bandpass filter; high isolation; selectivity; switchable;
Conference_Titel :
Microwave Conference (EuMC), 2013 European
Conference_Location :
Nuremberg
