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ElectroComponent Science and Technology
Volume 9 (1981), Issue 2, Pages 115-124
http://dx.doi.org/10.1155/APEC.9.115

The Influence of Filter Parameters on the Response of Ceramic Filters Operating in the Thickness-Twist Mode

Department of Electrical Engineering, University of Oulu, Oulu, Finland

Received 3 July 1980; Accepted 12 November 1980

Copyright © 1981 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Starting with common equivalent circuits, computer programs have been designed to enable the calculation of filter responses from the parameters of the ceramic material and the dimensions of the electrodes. By varying the parameter values their effect on the filter response is shown. To test the calculated results a number of test filters have been made and their responses measured. The filter responses have behaved as predicted by the calculations. It has been possible to calculate the response of thickness-twist mode filters with a centre frequency in the range 1 to 5 MHz, a bandwidth of 1 to 10%, a load impedance of 100 to 600 Ω and a comparatively linear phase response.