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

fYear

2013

fDate

6-10 Oct. 2013

Firstpage

1199

Lastpage

1202

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference (EuMC), 2013 European

Conference_Location

Nuremberg

Type

conf

Filename

6686878