High-Q tuned active bandpass filter for wireless application

Author

Kapilevich, Boris ; Lukjanets, Roman

Author_Institution

Siberia State Univ. of Telecommun. & Inf., Novosibirsk, Russia

fYear

2000

fDate

2000

Firstpage

227

Lastpage

230

Abstract

The paper presents a novel high-Q microwave tuned active bandpass filter using varactor diodes for tuning and a BJT to compensate for losses. The experimental filter with stepped resonator circuits and special coupling elements have been fabricated and tested demonstrating a good agreement with the circuit model predictions. Tuning range of 400 MHz for the active filter is achieved with the centre frequency of 1.6 GHz. A 3 dB bandwidth of 50 MHz is obtained and passband gain is typically 0.5-1.0 dB in the whole tuning range

Keywords

active filters; band-pass filters; circuit tuning; microstrip filters; microstrip resonators; microwave filters; microwave receivers; mobile radio; varactors; 0.5 to 1 dB; 1.6 GHz; 50 MHz; circuit model predictions; high-Q tuned active bandpass filter; loss compensation; microstrip tuned resonator; microwave filter; stepped resonator circuits; varactor diodes; wideband BJT amplifier; wireless application; Active filters; Band pass filters; Circuit optimization; Circuit testing; Coupling circuits; Diodes; Microwave filters; Resonator filters; Tuning; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Instrument Engineering Proceedings, 2000. APEIE-2000. Volume 1. 2000 5th International Conference on Actual Problems of

Conference_Location

Novosibirsk

Print_ISBN

0-7803-5903-8

Type

conf

DOI

10.1109/APEIE.2000.913128

Filename

913128