US4607229A
Expired / Lapsed
US
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Phase shifter
Assignee: Toshiba Corp
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Filing: 1984-11-08
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Granted: 1986-08-19
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Expires: 2004-11-08
Abstract
Abstract A phase shifter includes first and second mixers which mix a first signal with a second signal having a phase different from the first signal, respectively, third and fourth mixers which mix the second signal with the output signals of the first and second mixers and a combiner which combines the output signals of the third and fourth mixers to produce an output signal having a phase which is inverted with respect to the first signal.
Inventors
- 👤 Seiji Isobe
- 👤 Seiji Okubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:42
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/18; H03D; H03D7/00; H03D7/16; H03D7/165; H03D7/166; H03H11/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A phase shifter comprising: first and second terminals for receiving first and second signals having a phase difference from each other; first mixing means for mixing said first signal with said second signal; means for displacing the phase of said first signal by 90 degrees to produce a first phase-displaced signal; second mixing means for mixing said first phase-displaced signal with said second signal; third mixing means for mixing said second signal with an output signal provided from said first mixing means; means for displacing the phase of said second signal by 90 degrees to produce a second phase-displaced signal; fourth mixing means for mixing said second phase-displaced signal with an output signal provided from said second mixing means; and combining means for combining an output signal of said third mixing means with an output signal provided from said fourth mixing means to generate a signal which has a phase opposite to that of said first signal.
Claim 2
Dependent Claim
157 words
A phase shifter comprising: first and second terminals for receiving first and second signals having a phase difference from each other; first mixing means for mixing said first signal with said second signal; means for displacing the phase of said first signal by 90 degrees to produce a first phase-displaced signal; second mixing means for mixing said first phase-displaced signal with said second signal; third mixing means for mixing said second signal with an output signal provided from said first mixing means; means for displacing the phase of said second signal by 90 degrees to produce a second phase-displaced signal; fourth mixing means for mixing said second phase-displaced signal with an output signal provided from said second mixing means; and combining means for combining an output signal of said third mixing means with an output signal provided from said fourth mixing means to generate a signal which has a phase opposite to that of said first signal.
Claim 3
Dependent Claim
45 words
The phase shifter as defined in claim 1 wherein first and second low-pass filters and amplifiers in serial-relation to each other are inserted between said first mixer means and said third mixer means and between said second mixer means and said fourth mixer means, respectively.
Claim 4
Dependent Claim
23 words
The phase shifter as defined in claim 2 wherein said first and second amplifiers have inverse polarity gains with respect to each other.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |