US4141013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circularly polarized horn antenna
Assignee: Raytheon Co
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Filing: 1976-09-24
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Granted: 1979-02-20
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Expires: 1996-09-24
Abstract
Abstract A horn antenna is disclosed having a built-in circular polarizer and a cross polarization attenuator. A square-apertured horn antenna has a plurality of pairs of conductive fins disposed along opposite edges of the horn interior. The individual fins are separated from each other by approximately one-fourth wavelength. The fins are at a 45 degree angle to that linear wave and react with that linear wave by imparting a circular rotation to that wave as the wave propagates past each pair of fins. A stepped attenuator is mounted in the input section to the horn antenna perpendicular to the linear input wave. The attenuator substantially absorbs cross-polarized signals whether reflected from the aperture of the horn or provided by the incoming signal.
Inventors
- 👤 Timothy A. Crail
- 👤 Mon N. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:33
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/0241
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A compact, lightweight and improved integrated antenna comprising: input means for receiving a first linear signal which has a vector in a first plane and propagating in a direction normal to the first plane; horn means coupled to said input means and having a predetermined angle of flare for receiving the linear input signal and propagating the signal therethrough and for providing output signals being circularly polarized waves; and a plurality of pairs of conductive fins mounted within said horn means, each pair of conductive fins being mounted 180° apart, said fins being mounted at 45° to the direction of the vector for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 2
Dependent Claim
117 words
A compact, lightweight and improved integrated antenna comprising: input means for receiving a first linear signal which has a vector in a first plane and propagating in a direction normal to the first plane; horn means coupled to said input means and having a predetermined angle of flare for receiving the linear input signal and propagating the signal therethrough and for providing output signals being circularly polarized waves; and a plurality of pairs of conductive fins mounted within said horn means, each pair of conductive fins being mounted 180° apart, said fins being mounted at 45° to the direction of the vector for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 3
Dependent Claim
120 words
A compact, lightweight and improved integrated antenna comprising input means for receiving a first linear signal which has a vector in a first plane and propagating in a direction normal to the first plane; horn means coupled to said input means including a stepped transformer and having a predetermined angle of flare for receiving the linear input signal and propagating the signal therethrough and for providing output signals being circularly polarized waves; and a plurality of pairs of conductive fins mounted within said horn means, each pair of conductive fins being mounted 180° apart, and being in a plane normal to the direction of propagation for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 4
Dependent Claim
120 words
A compact, lightweight and improved integrated antenna comprising input means for receiving a first linear signal which has a vector in a first plane and propagating in a direction normal to the first plane; horn means coupled to said input means including a stepped transformer and having a predetermined angle of flare for receiving the linear input signal and propagating the signal therethrough and for providing output signals being circularly polarized waves; and a plurality of pairs of conductive fins mounted within said horn means, each pair of conductive fins being mounted 180° apart, and being in a plane normal to the direction of propagation for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 5
Dependent Claim
133 words
A compact, lightweight and improved integrated antenna, comprising: stepped transformer input means for receiving a first linear signal wave which has an E vector in a first plane and which propagates in a direction normal to the first plane; stepped attenuator means disposed within said stepped transformer input means for providing gradual attenuation to a second wave which has a vector perpendicular to said E vector, said stepped attenuator means having a plurality of conductive steps; horn means coupled to said input means, said horn means having a predetermined angle of flare for receiving the linear input signal wave and propagating it therethrough and for providing circularly polarized output waves; and iris means disposed within said horn means for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 6
Dependent Claim
133 words
A compact, lightweight and improved integrated antenna, comprising: stepped transformer input means for receiving a first linear signal wave which has an E vector in a first plane and which propagates in a direction normal to the first plane; stepped attenuator means disposed within said stepped transformer input means for providing gradual attenuation to a second wave which has a vector perpendicular to said E vector, said stepped attenuator means having a plurality of conductive steps; horn means coupled to said input means, said horn means having a predetermined angle of flare for receiving the linear input signal wave and propagating it therethrough and for providing circularly polarized output waves; and iris means disposed within said horn means for reacting with the linear input signal propagating therethrough and generating circularly polarized output signals.
Claim 7
Dependent Claim
51 words
The invention according to claim 3, wherein: said horn means has a square cross section; and said stepped transformer is a waveguide having first and second ends, said first end being rectangular, said second end being square, said waveguide having a predetermined number of steps between said first and second ends.
Claim 8
Dependent Claim
17 words
The invention according to claim 4 wherein the steps of said stepped transformer are one-fourth wavelength long.
Claim 9
Dependent Claim
43 words
The invention according to claim 3 further comprising: said stepped attenuator being a film of conductive material being a poor conductor for inducing currents in response to a second wave having a resultant vector being perpendicular to the vector of said first wave.
Claim 10
Dependent Claim
33 words
The invention according to claim 3 wherein said plurality of conductive steps are oriented such that a wave propagating in the opposite direction to said first wave is attenuated in an increasing manner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |