Theoretical and experimental investigation of novel varactor-tuned switchable microstrip ring resonator circuits

Author

Martin, T. Scott ; Wang, Fuchen ; Chang, Kai

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

36

Issue

12

fYear

1988

Firstpage

1733

Lastpage

1739

Abstract

A microstrip ring resonator circuit loaded with two p-i-n diodes has been developed for use as a switchable filter. By replacing one p-i-n diode with a varactor diode, the switchable filter can be made electronically tunable. Isolation exceeding 20 dB with 9% tuning bandwidth was demonstrated. An analysis based on transmission line theory was used to model both circuits. The analysis includes the effects of diode parasitics, coupling gaps, dispersion, and mounting-gap capacitance. The experimental results agree very well with the theoretical calculation.<>

Keywords

distributed parameter networks; equivalent circuits; linear network analysis; microwave filters; p-i-n diodes; passive filters; resonators; solid-state microwave circuits; strip line components; switched filters; transmission line theory; tuning; varactors; PIN diode loading; band-pass filters; band-reject type; coupling gaps; diode parasitics; dispersion; electronically tunable; microstrip ring resonator circuits; microwave filters; mounting-gap capacitance; p-i-n diodes; switchable filter; transmission line theory; varactor diode tuning; Bandwidth; Circuit optimization; Microstrip filters; Microstrip resonators; Optical ring resonators; P-i-n diodes; Resonator filters; Switching circuits; Tunable circuits and devices; Varactors;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.17407

Filename

17407