US3755760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential phase-shifter for providing a substantially constant differential phase-shift
Assignee: AT&T Inc
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Filing: 1972-10-06
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Granted: 1973-08-28
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Expires: 1992-10-06
Abstract
Abstract A differential phase-shifter which provides a substantially constant differential phase-shift to two orthogonally polarized waves having the same frequency band by causing one of the waves to see two phase-constant characteristics having rates of change over the band which are greater than and less than, respectively, the rate of change of the phase-constant seen by the other wave.
Inventors
- 👤 E Ohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/182
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A differential phase-shifter for providing a substantially constant differential phase-shift to first and second orthogonally polarized waves each having the same frequency band comprising: a conductively bounded waveguide capable of supporting said first and second waves; first means for loading a first portion of said waveguide having a first length to cause said first wave to see a first cutoff frequency in said first portion; and second means for loading a second portion of said waveguide to cause said second wave to see a second cutoff frequency which is less than said first cutoff frequency over a second length of said second portion and to see a third cuttoff frequency which is greater than said first cutoff frequency over a third length of said second portion, said second and third lengths having a sum which is equal to said first length and being so proportioned as to cause the phase-shift characteristic of said second portion corresponding to said second wave to track the phase-shift characteristic of said first portion corresponding to said first wave over said frequency band.
Claim 2
Dependent Claim
178 words
A differential phase-shifter for providing a substantially constant differential phase-shift to first and second orthogonally polarized waves each having the same frequency band comprising: a conductively bounded waveguide capable of supporting said first and second waves; first means for loading a first portion of said waveguide having a first length to cause said first wave to see a first cutoff frequency in said first portion; and second means for loading a second portion of said waveguide to cause said second wave to see a second cutoff frequency which is less than said first cutoff frequency over a second length of said second portion and to see a third cuttoff frequency which is greater than said first cutoff frequency over a third length of said second portion, said second and third lengths having a sum which is equal to said first length and being so proportioned as to cause the phase-shift characteristic of said second portion corresponding to said second wave to track the phase-shift characteristic of said first portion corresponding to said first wave over said frequency band.
Claim 3
Dependent Claim
119 words
A differential phase-shifter in accordance with claim 1 in which said first means results in the phase-constant characteristic of said first portion having a first magnitude and a first rate of change over said band; and in which said second means results in the phase-constant characteristic of the second length of said second portion having a second magnitude which is greater than said first magnitude and a second rate of change which is less than said first rate of change and in the phase-constant characteristic of the third length of said second portion having a third magnitude which is less than said first magnitude and a third rate of change which is greater than said first rate of change.
Claim 4
Dependent Claim
16 words
A differential phase-shifter in accordance with claim 1 in which said waveguide has a circular cross-section.
Claim 5
Dependent Claim
19 words
A differential phase-shifteR in accordance with claim 1 in which said second portion is included within said first portion.
Claim 6
Dependent Claim
197 words
A differential phase-shifter in accordance with claim 1 in which: said first means includes a first pair of fins symmetrically disposed within said first portion, each of said first pair of fins having a length which is equal to said first length and which is greater than its width and a width which is greater than its thickness and each being arranged with its length parallel to the axis of said waveguide and its width in plane which is parallel to the plane of polarization of said first wave; and said second means includes a second pair of fins symmetrically disposed within the second length of said second portion, each of said first pair of fins having a length which is equal to said second length and which is greater than its width and a width which is greater than its thickness and each being arranged with its length parallel to the axis of said guide and its width in a plane which is parallel to the plane of polarization of said second wave, said width of each of said second pair of fins being greater than said width of each of said first pair of fins.
Claim 7
Dependent Claim
35 words
A differential phase-shifter in accordance with claim 5 in which each of said first pair of fins has the same width and in which each of said second pair of fins has the same width.
References Cited (Backward Citations)
US2422058A
Cited
US2546840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |