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Quartz Filter Crystals with Low Inductance

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1 Author(s)
Vormer, J.J. ; Radio Laboratory, the Netherlands Postal Telegraph and Telephone service, The Hague, the Netherlands

By exciting a harmonic of the Y′ wave in a -18.5°-rotated X-cut quartz plate, the electrodes of the elementary halfwave sections being electrically connected in parallel, and by choosing for each half-wave section the ratio ls′/ly′> 1, an appreciable reduction in inductance can be obtained; e.g., tenfold or more. With regard to disturbing frequencies, it will be useful to choose this ratio in the neighborhood of 1.8.

Published in:

Proceedings of the IRE  (Volume:36 ,  Issue: 6 )