Patent US2826953A successfully refreshed from Google Patents.
USH370H
Expired / Lapsed
US
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Microwave circular polarization analyzer
Assignee: United States Department of the Navy
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Filing: 1986-12-01
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Granted: 1987-11-03
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Expires: 2006-12-01
Abstract
Abstract A microwave circular polarizer having two matched waveguide arms with a first arm having a twist in a first rotational sense and with a second arm having a twist in a second (reverse) rotational sense, and a hybrid coupler receiving radiation signals from the two arms. A left-hand 45° twist in one arm and a right-hand 45° twist in the other arm ensure that orthogonal linearly polarized components of an incident radiation field are combined in the hybrid coupler so as to direct a right circularly polarized signal out of one of the remaining ports of the hybrid coupler, and to direct a left circularly polarized signal from the other remaining port of the hybrid coupler.
Inventors
- 👤 Steven H. Gold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:45
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165; H01P1/17; H01P1/16; H01P1/161
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A circular polarization analyzer, comprising: a waveguide hybrid coupler, a first waveguide arm coupled to the hybrid coupler to introduce a first signal into the hybrid coupler, a twist in the first arm rotating in a first direction over a 45° angle; a second waveguide arm coupled to the hybrid coupler to introduce a second signal into the hybrid coupler, a twist in the second arm rotating in a second direction over a 45° angle; said arms being matched in length and symmetrically arranged relative to said hybrid coupler; whereby said first and second arms sample orthogonal linearly polarized components of an incident radiation field and combine them in said hybrid coupler to test the circular polarization of microwave radiation.
Claim 2
Dependent Claim
120 words
A circular polarization analyzer, comprising: a waveguide hybrid coupler, a first waveguide arm coupled to the hybrid coupler to introduce a first signal into the hybrid coupler, a twist in the first arm rotating in a first direction over a 45° angle; a second waveguide arm coupled to the hybrid coupler to introduce a second signal into the hybrid coupler, a twist in the second arm rotating in a second direction over a 45° angle; said arms being matched in length and symmetrically arranged relative to said hybrid coupler; whereby said first and second arms sample orthogonal linearly polarized components of an incident radiation field and combine them in said hybrid coupler to test the circular polarization of microwave radiation.
Claim 3
Dependent Claim
44 words
The analyzer set forth in claim 1 wherein said hybrid coupler has first and second input ports and first and second output ports, said first arm being coupled to said first input port, and said second arm being coupled to said second input port.
Claim 4
Dependent Claim
28 words
The analyzer set forth in claim 2 wherein said hybrid coupler is a short-slot 3-db coupler that can split a radiation signal into two parts of equal strength.
Claim 5
Dependent Claim
25 words
The analyzer set forth in claim 1 wherein said hybrid coupler and said arms are sized in cross-section to form a K a -band device.
Claim 6
Dependent Claim
16 words
The analyzer set forth in claim 4 wherein said arms are comprised of WR-28 waveguide sections.
Claim 7
Dependent Claim
53 words
The analyzer set forth in claim 1 wherein said hybrid coupler is a symmetric four port device characterized in that a radiation signal channeled through the first arm to the coupler splits into two parts in the coupler producing two output signals from said hybrid coupler separated by a phase angle of 90°.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |