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ElectroComponent Science and Technology
Volume 3, Issue 1, Pages 43-49

Wide Band Monolithic Crystal Filters Using Lithium Tantalate

Allen Clark Research Centre, The Plessey Company Limited, Caswell, Towcester, Northants, UK

Received 1 December 1975

Copyright © 1976 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.


The construction and performance of wide bandwidth monolithic crystal filters is demonstrated using single crystal lithium tantalate. Important steps in the fabrication of the filter and the necessary design criteria are discussed. The Bechmann conditions for single mode energy trapping and the inter-resonator coupling relationships are given. Using the data reported, filters operating at third harmonic frequencies (approximately 50 MHz) have been constructed with bandwidths up to 0.75%.