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A Miniature Variable Capacitor

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2 Author(s)
A. Biggar ; Harry Diamond Lab., U. S. Army Materiel Command ; R. Shoemaker

A two-section variable capacitor of novel design has been developed for use as a tuning element in a microelectronic superheterodyne receiver. The device consists of a ganged oscillator and RF section, both contained in a metallic cylinder 0.25 in. in diameter and 1.125 in. in length. Each section of this capacitor comprises: (1) an electrically grounded conductive screw, (2) a threaded insulating sleeve into which the screw fits, and (3) a conducting material surrounding the sleeve. In a typical capacitor, the capacitance of one section was variable between 0.75 and 8.0 pf and of the other section between 1.5 and 12.0 pf, the Q ranged from 224 at 10 megacycles to 190 at 20 megacycles, and capacitances remained within 1 percent of the set values over the temperature range -60 to + 80°C.

Published in:

IEEE Transactions on Component Parts  (Volume:11 ,  Issue: 2 )