Microwave noise measuring apparatus

Details Microwave noise measuring apparatus Microwave noise measuring apparatus

1986-08-19

1987-12-22

Tubbesing, T. H.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 83Q, 342174, G01R 2316, G01S 740

Patent

active

047148730

ABSTRACT:
Apparatus for measuring the phase noise content of a microwave signal source (10) includes a microwave cavity (22) resonant at a fixed frequency, signal generating means (23) operable to generate a frequency representing the difference between the source frequency and that of the resonant cavity, and mixing means (20) for combining the outputs of the source and the signal generating means. The output from the resonant cavity (22) is applied to a phase detector (15) together with a portion of the output of the mixing means (20) and the output of the phase detector (15) represents the phase noise content of the output of the microwave source (10). The signal generating means (23) includes a voltage-controlled oscillator the frequency of which is controlled by an output from the phase detector means (15) so as to maintain the output of the mixing means (20) at the resonant frequency of the microwave cavity (22).

REFERENCES:
patent: 2686303 (1954-08-01), Harrison
patent: 2874380 (1959-02-01), Fuller et al.
patent: 2902649 (1959-09-01), Bachmann
patent: 4634962 (1987-01-01), Banura et al.

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