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US 4,048,580 AGranted
Apparatus for detecting a stable microwave discrete frequency
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRichard A. Campbell, Richard A. Sparks, Robert W. Perry
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Abstract
An input signal, whose frequency is to be detected, is divided and sent i two arms. One arm applies a set phase and amplitude adjustment while the other arm has a phase response that is dependent upon the frequency. Both arms are fed to a phase detector whose output is used to indicate the frequency of the input.
Claims2
A system comprising a source of AC voltage;
- a power divider having an input and two outputs;
- said source of AC voltage being connected to the input of said power divider;
- a phase detector having first and second inputs and an output;
- first coupling means coupling the first output of said power divider to the first input of said phase detector, said first coupling means being a series connected variable phase shifter and variable attenuator for providing signal alignment and compensation, and being phase insensitive to the frequency of said AC voltage;
- second coupling means connecting the second output of said power divider to the second input of said phase detector, said second coupling means being a phase stable coaxial cable having an electrical length determined by the periodicity of the frequency reference and the interferometer sensitivity, and having a phase variance in accordance with the variance of the frequency of said source of AC voltage;
- and an oven means for controlling the ambient temperature;
- said phase detector, power divider, first coupling means, and second coupling means being inclosed in said oven means.
4 more elements
Dependencies are inferred from the claim text.