Millimeter-wave liquid-crystal-based tunable bandpass filter

Author

Yazdanpanahi, Mani ; Mirshekar-Syahkal, Dariush

Author_Institution

Sch. of Comput. Sci. & Electron. Eng., Univ. of Essex, Colchester, UK

fYear

2012

Firstpage

139

Lastpage

142

Abstract

For the first time, a tunable parallel-coupled microstrip lines filter based on nematic liquid crystals (LC) substrate for applications at mm-wave frequencies is presented. This 33 GHz filter has three-poles, about 10% bandwidth (3.3 GHz) and a tunability range of 2 GHz over bias voltages 0 to 10 V. Theoretical and experimental responses of the filter are in good agreement. The insertion loss of the filter is about 4.5 dB, but this is mainly due to the microstrip line to CPW transitions used for measurement of the filter by a probe-station.

Keywords

UHF filters; band-pass filters; coplanar waveguides; coupled circuits; liquid crystal devices; microstrip filters; microstrip transitions; microwave filters; millimetre wave filters; nematic liquid crystals; CPW transition; bandwidth 3.3 GHz; frequency 2 GHz; frequency 33 GHz; insertion loss; microstrip line transition; millimeter-wave liquid-crystal-based tunable bandpass filter; mmwave frequency; nematic LC substrate; nematic liquid crystal substrate; probe-station filter measurement; tunable parallel-coupled microstrip lines filter; voltage 0 V to 10 V; Band pass filters; Dielectrics; Liquid crystals; Microstrip filters; Microwave filters; Resonator filters; Substrates; Coupling; filter; liquid crystal (LC); mm-wave frequencies;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium (RWS), 2012 IEEE

Conference_Location

Santa Clara, CA

ISSN

2164-2958

Print_ISBN

978-1-4577-1153-4

Type

conf

DOI

10.1109/RWS.2012.6175306

Filename

6175306