Variable Bandpass Filters Using Varactor Diodes

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1981 English Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Microwave Theory and Techniques, volume 29, pages 363-363 (issn: 0018-9480,

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Authors: S. Toyoda;

doi: 10.1109/tmtt.1981.1130358

Variable Bandpass Filters Using Varactor Diodes

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Abstract

A rectangular waveguide type variable bandpass filter for the 4-GHz bandpass has been proposed and tested. The bandpass width varies from 260 MHz to 1.02 GHz for a filter using varactor diodes. Two microstrip variable bandpass filters for the 6-GHz and 4-GHz bands are also proposed and tested. The passband width varies from 310 MHz to1.24 GHz for a varactor-diode coupled filter, and it varies from 380 MHz to 2.18 GHz for a filter which is composed of low-pass and high pass filters connected in cascade. The center frequency of the three filters can be changed arbitrarily.

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