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Dielectric Potentiometers

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1 Author(s)
Pihl, G.E. ; Technology Instrument Corp., Acton, Mass.

The term "dielectric potentiometer" is used to designate a new type of controllable voltage divider employing a lossy liquid dielectric as the impedance medium. With proper design, the dielectric potentiometer may be operated over an extremely wide frequency range with a flat amplitude response and zero phase shift. Unlike conventional wire-wound and film type controls, the new device is readily capable of being perfectly compensated for broadband operation when operated into either resistive or capacitive loading, or a parallel combination of both. Other advantages include infinite resolution, long life, and adaptability to specific nonlinear requirements. Probable advantages such as a low noise figure and the capability of operation at high rotational speeds have yet to be experimentally investigated. Examples of designs for particular applications are given.

Published in:

Proceedings of the IRE  (Volume:42 ,  Issue: 12 )