Title :
Quartz Filter Crystals with Low Inductance
Author_Institution :
Radio Laboratory, the Netherlands Postal Telegraph and Telephone service, The Hague, the Netherlands
fDate :
6/1/1948 12:00:00 AM
Abstract :
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.
Keywords :
Arm; Band pass filters; Bandwidth; Capacitance; Crystals; Electrodes; Frequency; Inductance; Power harmonic filters; Telephony;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1948.226274
