Design of tunable ferroelectric filters with a constant fractional band width

Author

Vendik, I. ; Vendik, O. ; Pleskachev, V. ; Svishchev, A. ; Wordenweber, R.

Author_Institution

Electrotech. Univ., St. Petersburg, Russia

Volume

3

fYear

2001

fDate

20-24 May 2001

Firstpage

1461

Abstract

The main principle of design of tunable ferroelectric filters with a constant fractional band width in the tuning range are discussed. Lumped ferroelectric capacitors are used as the tunable components of the microstrip filter. The limitation of the filter performance is determined by the commutation quality factor of the ferroelectric varactor. The influence of the loss factor of the ferroelectric capacitor is analyzed. The 3-pole 1% fractional band pass filter with a 3 band width tuning range without a degradation of the characteristics is designed.

Keywords

Q-factor; UHF filters; band-pass filters; circuit tuning; ferroelectric capacitors; linear network synthesis; losses; microstrip filters; passive filters; varactors; bandpass filter; commutation quality factor; constant fractional bandwidth; ferroelectric varactor; filter performance; loss factor; lumped ferroelectric capacitors; microstrip filter; narrow-band filters; tunable capacitors; tunable ferroelectric filters; Band pass filters; Breakdown voltage; Capacitors; Degradation; Equations; Ferroelectric materials; Frequency; Prototypes; Q factor; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2001 IEEE MTT-S International

Conference_Location

Phoenix, AZ, USA

ISSN

0149-645X

Print_ISBN

0-7803-6538-0

Type

conf

DOI

10.1109/MWSYM.2001.967178

Filename

967178