Patent US5006823A successfully refreshed from Google Patents.
US5006823A
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Microwave phase shifter with 0 or π phase shift
Assignee: Thales SA
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Filing: 1989-10-23
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Granted: 1991-04-09
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Expires: 2009-10-23
Abstract
Abstract Disclosed is a microwave phase shifter which is capable, in response to a control signal, of generating either a phase shift that is substantially zero or a phase shift that is substantially equal to π. It comprises a FET that is preferably symmetrical and works in an amplifier assembly. Low-frequency switching-over means make it possible, by reversing the biases at the source and the drain, to invert the FET. This inverting causes a phase shift by π in the microwave signal taken at the output of the circuit.
Inventors
- 👤 Michel-Claude Baril
- 👤 Dominique Rimbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:44
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; H03C7/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A microwave phase shifter for generating, in response to a control signal, a phase shift of zero or a phase shift of π comprising at least one field effect transistor having three electrodes, one of which is a gate, and to said gate an input microwave is applied, the output microwave being taken at one of the other two electrodes of said transistor, and low-frequency switching-over means for applying, between said other two electrodes, a dc bias voltage with a predetermined value but with a different polarity according to the phase shift (either zero or π) desired.
Claim 2
Dependent Claim
97 words
A microwave phase shifter for generating, in response to a control signal, a phase shift of zero or a phase shift of π comprising at least one field effect transistor having three electrodes, one of which is a gate, and to said gate an input microwave is applied, the output microwave being taken at one of the other two electrodes of said transistor, and low-frequency switching-over means for applying, between said other two electrodes, a dc bias voltage with a predetermined value but with a different polarity according to the phase shift (either zero or π) desired.
Claim 3
Dependent Claim
45 words
A microwave phase shifter according to claim 1, wherein said low frequency switching-over means is coupled to the source and drain of said field effect transistor comprise low-frequency switching-over transistors which are connected for working under the same dc voltage as said field effect transistor.
Claim 4
Dependent Claim
21 words
A microwave phase shifter according to claim 1, wherein the field effect transistor is chosen to be of the symmetrical type.
Claim 5
Dependent Claim
18 words
A microwave phase shifter according to claim 1, wherein the field effect transistor is a gallium arsenide transistor.
Claim 6
Dependent Claim
20 words
A microwave phase shifter according to claim 1, wherein the field effect transistor is made of an N type material.
Claim 7
Dependent Claim
50 words
A microwave phase shifter according to claim 1, including a phase compensation circuit comprising, on the output electrode of the field effect transistor, a circuit with series-mounted choke and capacitor connected between this electrode and the ground, and a decoupling capacitor on the other electrode of this field effect transistor.
Claim 8
Dependent Claim
25 words
A microwave phase shifter according to claim 1, including a negative feedback circuit between the output electrode of the field effect transistor and its gate.
Claim 9
Dependent Claim
24 words
A microwave phase shifter according to claim 1, including an amplitude compensation circuit placed in parallel on the gate of the field effect transistor.
Claim 10
Dependent Claim
29 words
A microwave phase shifter according to claim 1, wherein said low-frequency switching-over means applies said dc bias voltage between a source electrode and a drain electrode of said transistor.
Claim 11
Dependent Claim
87 words
A microwave phase shifter for generating, in response to a control signal, a 0° or 180° phase shift comprising a field effect transistor having three terminals, a gate, a source and a drain; said gate adapted to receive a microwave signal, and the output microwave being provided at one of the other two electrodes of this transistor, low-frequency switching-over means for applying, between the source and the drain, a dc bias voltage with a predetermined value but with a reversible polarity according to the phase shift desired.
Claim 12
Dependent Claim
87 words
A microwave phase shifter for generating, in response to a control signal, a 0° or 180° phase shift comprising a field effect transistor having three terminals, a gate, a source and a drain; said gate adapted to receive a microwave signal, and the output microwave being provided at one of the other two electrodes of this transistor, low-frequency switching-over means for applying, between the source and the drain, a dc bias voltage with a predetermined value but with a reversible polarity according to the phase shift desired.
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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) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |