Patent US5086301A successfully refreshed from Google Patents.
US5086301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarization converter application for accessing linearly polarized satellites with single- or dual-circularly polarized earth station antennas
Assignee: INTELSAT SERVICES Corp
•
Filing: 1990-01-10
•
Granted: 1992-02-04
•
Expires: 2010-01-10
Abstract
Abstract A single- or dual-circularly polarized earth station antenna is converted into a single- or dual-linearly polarized earth station antenna for accessing linearly polarized satellites. In a first embodiment, a free-space meander line polarizer providing a 90 DEG differential phase shift between two orthogonal polarizations is disposed in front of the earth station antenna feed system. In a second embodiment, a power dividing (transmit) or power combining (receive) network operates in conjunction with differential phase shift circuits to achieve the polarization conversion. <IMAGE>
Inventors
- 👤 William J. English
- 👤 Hans H. Viskum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:05
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/245; H01Q15/00; H01Q15/24; H01Q15/242
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
82 words
An apparatus responsive to an input signal for transmitting corresponding linearly polarized signals, said apparatus comprising: a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) transmit port and a right-hand circular polarization (RHCP) transmit port; and polarization conversion means coupled to said LHCP and RHCP transmit ports and responsive to said input signal for providing a converted signal to said LHCP and RHCP transmit ports for causing said feed system to transmit signals linearly polarized in at least one direction.
Claim 2
Independent Claim
82 words
An apparatus responsive to an input signal for transmitting corresponding linearly polarized signals, said apparatus comprising: a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) transmit port and a right-hand circular polarization (RHCP) transmit port; and polarization conversion means coupled to said LHCP and RHCP transmit ports and responsive to said input signal for providing a converted signal to said LHCP and RHCP transmit ports for causing said feed system to transmit signals linearly polarized in at least one direction.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1, wherein said polarization conversion means causes said feed system to transmit signals linearly polarized in two orthogonal directions.
Claim 4
Dependent Claim
77 words
An apparatus according to claim 1, wherein said polarization conversion means comprises power dividing means for receiving at least one signal and dividing it between first and second outputs, and coupling means for coupling one of said outputs to one of said LHCP and RHCP transmit ports while coupling the other of said first and second outputs to the other of said LHCP and RHCP transmit ports with a variable phase shift relative to said first output.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 3, wherein said power dividing means is a hybrid divider.
Claim 6
Dependent Claim
15 words
An apparatus according to claim 3, wherein said power dividing means comprises a magic tee.
Claim 7
Independent Claim
66 words
An apparatus for receiving linearly polarized signals, said apparatus comprising: a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) receive port and a right-hand circular polarization (RHCP) receive port; and polarization conversion means coupled to said LHCP and RHCP receive ports and responsive to signals provided to said receive ports by said feed system for detecting linearly polarized signals received by said feed system.
Claim 8
Independent Claim
66 words
An apparatus for receiving linearly polarized signals, said apparatus comprising: a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) receive port and a right-hand circular polarization (RHCP) receive port; and polarization conversion means coupled to said LHCP and RHCP receive ports and responsive to signals provided to said receive ports by said feed system for detecting linearly polarized signals received by said feed system.
Claim 9
Dependent Claim
84 words
An apparatus according to claim 6, wherein said polarization conversion means comprises power combining means for receiving first and second signals at first and second combiner inputs and combining said first and second signals into a combiner output, and coupling means for coupling one of said LHCP and RHCP receive ports to said first combiner input while coupling the other of said LHCP and RHCP receive ports to said second combiner input with a variable phase shift with respect to said first combiner input.
Claim 10
Dependent Claim
15 words
An apparatus according to claim 7, wherein said power combining means is a hybrid combiner.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 3, wherein said power combining means comprises a magic tee.
Claim 12
Independent Claim
76 words
A method of transmitting linearly polarized signals corresponding to an input signal, via a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) transmit port and a right-hand circular polarization (RHCP) transmit port, said method comprising the steps of: providing said input signal; and passing said input signal to said LHCP and RHCP transmit ports via polarization conversion means to thereby cause said feed system to transmit signals linearly polarized in at least one direction.
Claim 13
Independent Claim
76 words
A method of transmitting linearly polarized signals corresponding to an input signal, via a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) transmit port and a right-hand circular polarization (RHCP) transmit port, said method comprising the steps of: providing said input signal; and passing said input signal to said LHCP and RHCP transmit ports via polarization conversion means to thereby cause said feed system to transmit signals linearly polarized in at least one direction.
Claim 14
Independent Claim
73 words
A method of receiving linearly polarized signals, said method comprising the steps of: receiving said linearly polarized signals via a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) receive port and a right-hand circular polarization (RHCP) receive port; and passing output signals from said LHCP and RHCP receive ports through a polarization converter coupled to said LHCP and RHCP receive ports for detecting linearly polarized signals received by said feed system.
Claim 15
Independent Claim
73 words
A method of receiving linearly polarized signals, said method comprising the steps of: receiving said linearly polarized signals via a dual-circularly polarized feed system having a left-hand circular polarization (LHCP) receive port and a right-hand circular polarization (RHCP) receive port; and passing output signals from said LHCP and RHCP receive ports through a polarization converter coupled to said LHCP and RHCP receive ports for detecting linearly polarized signals received by said feed system.
References Cited (Backward Citations)
US3076188A
Cited
US3184743A
Cited
US4336542A
Cited
US4308541A
Cited
US4387377A
Cited
US4599623A
Cited
US4568943A
Cited
US4663634A
Cited
US4686537A
Cited
US4786914A
Cited
US4714930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |