Microwave probe

Details Microwave probe Microwave probe

1988-03-04

1989-05-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 58C, G01N 2204, G01R 2726

Patent

active

048292338

ABSTRACT:
A microwave probe for determining properties of a fluid medium, and particularly for separating measuring dielectric constant and dielectric loss, comprises an insulating substrate metallized on one face, an electrically isolated, ring-shaped, resonant element defined on the opposite face, and shielded means to couple microwaves into and from the element such that the element can undergo a resonance. The resonant frequency depends on the dielectric constant of an adjacent medium, while the Q-factor of the resonance depends on the dielectric loss of the medium. In one method of operation microwaves are coupled into the element to force an oscillation, and the driving frquency is varied to obtain a resonance.

REFERENCES:
patent: 3509456 (1970-04-01), Zurbrick
patent: 3581197 (1971-05-01), Morey
patent: 3750013 (1973-07-01), Rotman
patent: 3942107 (1976-03-01), Gerhard
Chang: "Varactor Tuned Microstrip Ring Resonators"-IEEE Intl. MW Symposium-1986.
Itoh: "A New Method for Measuring Properties of Dielectric Materials Using a Microstrip Cavity".

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