US3832713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave phase shifting apparatus
Assignee: United States Department of the Navy
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Filing: 1973-03-01
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Granted: 1974-08-27
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Expires: 1993-03-01
Abstract
Abstract Apparatus for phase shifting between radiating elements of an antenna array by utilizing the inherent phase difference existing between frequency locked oscillators. Power from a master oscillator is injected into a plurality of slave oscillators, each of which feeds a different radiating element. The slave output is also fed through a directional coupler into a phase comparator which receives a comparison output signal from the master oscillator. The comparator output and a DC phase reference voltage are applied to a differential amplifier whose output forces the free-running frequency of the slave oscillator to change until the comparator output equals phase reference voltage.
Inventors
- 👤 D Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:24
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
Apparatus for phase shifting radiating elements of an antenna array and comprising: first oscillator means having a resonant cavity and being connected at its output to a radiating element of said array; second oscillator means connected at its output to said resonant cavity of said first oscillator means for injecting RF energy thereto; said first and second oscillators being frequency locked with respect to each other; phase comparator means connected at the input to the outputs of said first and second oscillator means for measuring the phase angle therebetween, and for producing an output voltage proportional to the sine of said phase angle; differential amplifier means connected at the input to the output of said phase comparator means and a DC phase reference voltage proportional to sine of the desired phase shift, and being connected at its output to said first oscillator means.
Claim 2
Dependent Claim
143 words
Apparatus for phase shifting radiating elements of an antenna array and comprising: first oscillator means having a resonant cavity and being connected at its output to a radiating element of said array; second oscillator means connected at its output to said resonant cavity of said first oscillator means for injecting RF energy thereto; said first and second oscillators being frequency locked with respect to each other; phase comparator means connected at the input to the outputs of said first and second oscillator means for measuring the phase angle therebetween, and for producing an output voltage proportional to the sine of said phase angle; differential amplifier means connected at the input to the output of said phase comparator means and a DC phase reference voltage proportional to sine of the desired phase shift, and being connected at its output to said first oscillator means.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 further including microwave circulator means connected between the output of said second oscillator means and said resonant cavity of said first oscillator means.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1 further including serially connected RF amplifier means and directional coupler means connected between said output of said first oscillator means and said radiating element.
Claim 5
Dependent Claim
79 words
Phase shifting apparatus comprising: first and second frequency locked oscillators; means for injecting RF energy from said second oscillator into said first oscillator to change the output frequency thereof to that of said second oscillator; comparator means connected to the outputs of said first and second oscillators for measuring the phase angle between said two outputs; and, means for applying a DC reference voltage to said first oscillator means to change the free-running frequency thereof a selectively predetermined amount.
Claim 6
Dependent Claim
79 words
Phase shifting apparatus comprising: first and second frequency locked oscillators; means for injecting RF energy from said second oscillator into said first oscillator to change the output frequency thereof to that of said second oscillator; comparator means connected to the outputs of said first and second oscillators for measuring the phase angle between said two outputs; and, means for applying a DC reference voltage to said first oscillator means to change the free-running frequency thereof a selectively predetermined amount.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |