US4369519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross polarization compensation system
Assignee: KDDI Corp
•
Filing: 1979-01-29
•
Granted: 1983-01-18
•
Expires: 1999-01-29
Abstract
Abstract A cross polarization compensation system, in which an input elliptically polarized wave is converted, by a first rotatable differential phase shifter having a phase shift of 90° or less than 90°, into an elliptically polarized wave defined by |α|=|cot.sup.-1 γ| (where α is the tilt angle of an ellipse indicative of the elliptically polarized wave relative to a predetermined reference direction and γ is the axial ratio for the ellipse), and then the phase delay or advance plane of a second rotatable differential phase shifter having a phase shift of the ellipse indicative of 90° is disposed in alignment with the major axis of the converted elliptically polarized wave, thereby to obtain a linearly polarized wave having electric fields components of a desired direction.
Inventors
- 👤 Hironori Yuuki
- 👤 Hiroshi Kurihara
- 👤 Noboru Baba
- 👤 Makoto Arai
- 👤 Kazunori Inagaki
- 👤 Matsuichi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:33
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/245; H04; H04B; H04B7/00; H04B7/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
226 words
A cross polarization compensation system comprising: input terminal means for receiving an input elliptically polarized wave; first rotatable differential phase shift means having a phase shift of 90° or less than 90° and operatively connected to said input terminal means for phase shifting the received elliptically polarized wave; first control means operatively connected to said first rotatable differential phase shift means for controlling said first rotatable differential phase shift means so that said input elliptically polarized wave is converted by said first rotatable differential phase shift means into a converted elliptically polarized wave defined by |α|=|cot.sup.-1 γ| where α is the tilt angle of an ellipse indicative of the converted elliptically polarized wave to a predetermined reference direction and γ is the axial ratio for said ellipse; second rotatable differential phase shift means having a phase shift of 90° and connected to said first rotatable differential phase shift means for phase shifting said converted elliptically polarized wave; and second control means operatively connected to said second rotatable differential phase shift means for disposing the phase delay or advance plane of said second rotatable differential phase shift means in alignment with the major axis of the ellipse indicative of the converted elliptically polarized wave, thereby to obtain a linearly polarized wave having electric fields components of a desired direction through said second rotatable differential phase shift means.
Claim 2
Dependent Claim
226 words
A cross polarization compensation system comprising: input terminal means for receiving an input elliptically polarized wave; first rotatable differential phase shift means having a phase shift of 90° or less than 90° and operatively connected to said input terminal means for phase shifting the received elliptically polarized wave; first control means operatively connected to said first rotatable differential phase shift means for controlling said first rotatable differential phase shift means so that said input elliptically polarized wave is converted by said first rotatable differential phase shift means into a converted elliptically polarized wave defined by |α|=|cot.sup.-1 γ| where α is the tilt angle of an ellipse indicative of the converted elliptically polarized wave to a predetermined reference direction and γ is the axial ratio for said ellipse; second rotatable differential phase shift means having a phase shift of 90° and connected to said first rotatable differential phase shift means for phase shifting said converted elliptically polarized wave; and second control means operatively connected to said second rotatable differential phase shift means for disposing the phase delay or advance plane of said second rotatable differential phase shift means in alignment with the major axis of the ellipse indicative of the converted elliptically polarized wave, thereby to obtain a linearly polarized wave having electric fields components of a desired direction through said second rotatable differential phase shift means.
References Cited (Backward Citations)
US3430156A
Cited
US3500207A
Cited
US3735266A
Cited
US3986123A
Cited
US4027105A
Cited
FR2303425A1
Cited
JPS51115717A
Cited
US4090137A
Cited
US4112370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |