Phase sensor for R.F. transmission lines

Details Phase sensor for R.F. transmission lines Phase sensor for R.F. transmission lines

1980-09-11

1982-06-08

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 84, 324126, G01R 2704

Patent

active

043341870

ABSTRACT:
A phase sensing device is described which is useful for indicating the reance condition of a complex load impedance (such as an antenna), with a high degree of accuracy over the frequency range from 3 to 100 MHz. The device uses readily available transmission line and solid state components to provide a .+-. indication of the phase condition of the load; a zero crossing indicates resonance. Such a signal is useful for controlling an automatic turning mechanism that could be used in a tunable antenna. The extremely broadband operation and no physical connection to the main RF line are salient features of the device. The components are a transmission line coupler with a short pick-up wire mounted adjacent to the center conductor, two diodes with like electrodes (cathodes) connected to opposite ends of the pick-up wire, a carbon resistor between the other electrodes of the diodes, and a zero center meter across the resistor.

REFERENCES:
patent: 2442606 (1948-06-01), Korman
patent: 4262246 (1981-04-01), Fujii

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