A simple method to design wide-band electronically tunable combline filters

Author

Torregrosa-Penalva, Germán ; López-Risueño, Gustavo ; Alonso, José I.

Author_Institution

Grupo de Microondas y Radar, Univ. Politecnica de Madrid, Spain

Volume

50

Issue

1

fYear

2002

fDate

1/1/2002 12:00:00 AM

Firstpage

172

Lastpage

177

Abstract

A new systematic approach for designing wide-band tunable combline filters is presented. New results on tunable combline filter theory are proposed and explicit design formulas, to obtain the filter design parameters from specifications, are included. These design parameters are: center frequency, resonator electrical length, instantaneous bandwidth, and tuning capacitance. The proposed design technique is used to construct an X-band wide-band microstrip tunable filter from 8 to 12 GHz with commercial GaAs FETs as tuning elements. Parasitic effects and simulation problems are also discussed

Keywords

MESFET circuits; band-pass filters; circuit simulation; circuit tuning; comb filters; microstrip filters; 8 to 12 GHz; GaAs; GaAs FET tuning elements; NE7 1000 MESFET; X-band wide-band microstrip tunable filter; center frequency; filter design parameters; frequency control; instantaneous bandwidth; nonideal effects; parasitic effects; resonator electrical length; simulation problems; systematic approach; tunable combline filter theory; tuning capacitance; wide-band electronically tunable combline filter design; Bandwidth; Design methodology; Filtering theory; Gallium arsenide; Microstrip filters; Parasitic capacitance; Resonant frequency; Resonator filters; Tuning; Wideband;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.981262

Filename

981262