Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.967178
