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US3924206A
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Radio frequency attenuator comprising a plurality of variable phase shifters and serially coupled directional couplers
Assignee: Raytheon Co
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Filing: 1974-08-21
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Granted: 1975-12-02
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Expires: 1994-08-21
Abstract
Abstract A radio frequency attenuator including a ladder network made up of ''''N'''' serially coupled stages, each one of such stages having an output terminal coupled to a radio frequency source through a first and a second path, such second path having disposed therein a variable phase shifter. Included in each such stage is a load adapted to dissipate in the order of one Nth the power in the radio frequency energy. Each one of the phase shifters is responsive to a binary signal and the phase shift provided by each one of such phase shifters changes M 180* in accordance with the binary signal (where M is an odd integer).
Inventors
- 👤 Matthew Fassett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:18
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
A radio frequency attentuator for coupling a source of radio frequency energy to an output load with an amount of attenuation selected in accordance with signals provided by a control signal source, comprising: a. a first plurality of serially coupled directional couplers, the last one thereof being adapted for coupling to the output load; b. a plurality of loads, each one thereof being coupled to a different one of the directional couplers; c. a plurality of variable phase shifters, each one thereof being coupled to a different one of the directional couplers and to the control signal source; d. a second plurality of directional couplers, each one thereof being coupled to a different one of the first plurality of directional couplers through a different one of the variable phase shifters; and e. a power divider having an input terminal adapted for coupling to the source of radio frequency energy, and a pair of output terminals, one of such output terminals being coupled to the first one of the first plurality of serially coupled directional couplers and the other one of the pair of output terminals being coupled to the first one of the second plurality of serially coupled directional couplers.
Claim 2
Dependent Claim
200 words
A radio frequency attentuator for coupling a source of radio frequency energy to an output load with an amount of attenuation selected in accordance with signals provided by a control signal source, comprising: a. a first plurality of serially coupled directional couplers, the last one thereof being adapted for coupling to the output load; b. a plurality of loads, each one thereof being coupled to a different one of the directional couplers; c. a plurality of variable phase shifters, each one thereof being coupled to a different one of the directional couplers and to the control signal source; d. a second plurality of directional couplers, each one thereof being coupled to a different one of the first plurality of directional couplers through a different one of the variable phase shifters; and e. a power divider having an input terminal adapted for coupling to the source of radio frequency energy, and a pair of output terminals, one of such output terminals being coupled to the first one of the first plurality of serially coupled directional couplers and the other one of the pair of output terminals being coupled to the first one of the second plurality of serially coupled directional couplers.
Claim 3
Dependent Claim
116 words
The radio frequency attenuator recited in claim 1 wherein each one of the directional couplers in the first plurality thereof is coupled to the pair of output terminals of the power divider through two paths, one of such two paths having one of the phase shifters disposed therein, and wherein the control signal source is adapted to set the one of the phase shifters in a selected one of two phase states, one of such phase states providing M(180*) (where M is an odd integer) phase shift to radio frequency energy passing therethrough relative to the phase shift provided to such energy when such phase shifter is set in the other one of such phase states.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |