US4048580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting a stable microwave discrete frequency
Assignee: United States Department of the Army
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Filing: 1976-10-18
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Granted: 1977-09-13
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Expires: 1996-10-18
Abstract
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.
Inventors
- 👤 Richard A. Campbell
- 👤 Richard A. Sparks
- 👤 Robert W. Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
183 words
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.
Claim 2
Independent Claim
183 words
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.
Claim 3
Dependent Claim
96 words
A system as set forth in claim 1 further comprising an amplifier means having first and second inputs and an output; said output of said phase detector being connected to said first input of said amplifier; an adjustable bias means having an output connected to said second input of said amplifier means; a voltage control oscillator being the source producing said AC voltage and having a controlled input; and said output of said amplifier means being connected to the control input of said voltage control oscillator so as to control the frequency output of said oscillator.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |