Electronically switchable and tunable coplanar waveguide-slotline band-pass filters

Author

Shu, Yong-Hui ; Navarro, Julio A. ; Chang, Kai

Author_Institution

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

Volume

39

Issue

3

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

548

Lastpage

554

Abstract

A coplanar waveguide (CPW)-slotline bandpass filter is described. The circuit allows planar integration of active and passive semiconductor devices both in series and in shunt. A microstrip-to-slotline transition designed to test the filter is also described. Two of the transitions exhibit an insertion loss of less than 1.0 dB over the 2.0-4.0-GHz range. A three-section CPW-slotline bandpass filter demonstrates an insertion loss of less than 0.2 dB over the passband centered at 2.9 GHz. A three-section CPW-slotline switchable bandpass filter integrated with three p-i-n diodes is discussed. It has a 0.7-dB insertion loss in the passband when the p-i-n diodes are off and a 25.0-dB isolation across the entire band when the p-i-n diodes are on. A three-section CPW-slotline varactor-tunable filter integrated with three varactor diodes is presented, showing a 2.0-dB insertion loss and over 20% electronic tuning range. Simple transmission line circuit models are used to optimize the design

Keywords

band-pass filters; microwave filters; p-i-n diodes; passive filters; tuning; varactors; 0.2 to 2 dB; 2 to 4 GHz; band-pass filters; coplanar waveguide; insertion loss; p-i-n diodes; planar integration; tunable coplanar waveguide-slotline; varactor diodes; varactor-tunable filter; Band pass filters; Circuit testing; Coplanar waveguides; Insertion loss; Microstrip filters; P-i-n diodes; Passband; Semiconductor devices; Semiconductor waveguides; Tunable circuits and devices;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.75299

Filename

75299