Patent US3795914A successfully refreshed from Google Patents.
US3795914A
Expired / Lapsed
US
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Rotating beacon antenna with polarization filter
Assignee: Raytheon Co
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Filing: 1972-09-20
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Granted: 1974-03-05
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Expires: 1992-09-20
Abstract
Abstract TACAN antennas emit modulated radiation from parasitic reflecting elements associated with a central array having radiating elements coupled to an energizing source. Signal energy from the TACAN antenna is preferably radiated in a plane perpendicular to the surface of the earth. Cross polarization components of the radiated signal are absorbed by resistive wires located in the radiation path from the central antenna array. These resistive wires are mounted around the supporting structure of the TACAN antenna.
Inventors
- 👤 S Pickles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:56
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/02; H01Q15/12; H01Q17/00; H01Q17/001; H01Q3/00; H01Q3/12; H01Q3/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a central array having radiating elements coupled to an energizing source, a plurality of parasitic elements disposed to revolve around said array at a given radial distance therefrom to provide modulation of radiation from said central array, a first array of horizontal absorbing elements spaced about the periphery of the revolving parasitic elements on a first diameter to reduce complex polarization radiation from said antenna pattern, a second array of horizontal absorbing elements spaced onequarter wavelength from said first plurality on a second diameter to further reduce complex polarization radiation, and means for supporting said first and second array of absorbing elements on the first and second diameters.
Claim 2
Dependent Claim
120 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a central array having radiating elements coupled to an energizing source, a plurality of parasitic elements disposed to revolve around said array at a given radial distance therefrom to provide modulation of radiation from said central array, a first array of horizontal absorbing elements spaced about the periphery of the revolving parasitic elements on a first diameter to reduce complex polarization radiation from said antenna pattern, a second array of horizontal absorbing elements spaced onequarter wavelength from said first plurality on a second diameter to further reduce complex polarization radiation, and means for supporting said first and second array of absorbing elements on the first and second diameters.
Claim 3
Dependent Claim
41 words
An antenna emitting a rotating multilobed pattern of radiation as set forth in claim 1 wherein said first and second array includes a plurality of resistive wires spaced about the periphery of the revolving parasitic elements to absorb selected polarized radiation.
Claim 4
Dependent Claim
144 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a central array havin radiating elements coupled to an energizing source, a plurality of parasitic elements disposed to revolve around said array at a given radial distance therefrom, support means for positioning said plurality of parasitic elements coupled to a drive motor and rotated thereby to cause rotation of said parasitic elements around the central array for modulating the electromagnetic energy radiated therefrom, a plurality of absorbing elements attached to said support means in proximity to said parasitic elements for reducing complex polarization radiation from said antenna pattern, additional support means positioned between said first support means and said central antenna array, and a second plurality of absorbing elements attached to said additional support means between said first plurality of elements and the central antenna array to further reduce complex polarization radiation.
Claim 5
Dependent Claim
144 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a central array havin radiating elements coupled to an energizing source, a plurality of parasitic elements disposed to revolve around said array at a given radial distance therefrom, support means for positioning said plurality of parasitic elements coupled to a drive motor and rotated thereby to cause rotation of said parasitic elements around the central array for modulating the electromagnetic energy radiated therefrom, a plurality of absorbing elements attached to said support means in proximity to said parasitic elements for reducing complex polarization radiation from said antenna pattern, additional support means positioned between said first support means and said central antenna array, and a second plurality of absorbing elements attached to said additional support means between said first plurality of elements and the central antenna array to further reduce complex polarization radiation.
Claim 6
Dependent Claim
45 words
An antenna emitting a rotating multilobed pattern of radiation as set forth in claim 3 including a stationary radome enclosing said support means and central array and including an additional plurality of absorbing elements spaced from said first plurality of elements around said stationary radome.
Claim 7
Dependent Claim
41 words
An antenna emitting a rotating multilobed pattern of radiation as set forth in claim 4 wherein said first, second and third plurality of absorbing elements are positioned horizontally to minimize a horizontal polarization component from the radiation pattern of said antenna.
Claim 8
Dependent Claim
150 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a drive motor, a central array having radiating elements coupled to an energizing source, a plurality of parasitic elements dispoSed to revolve around said array at a given radial distance therefrom, support means for positioning said plurality of parasitic elements and coupled to said drive motor and rotated thereby to cause rotation of said parasitic elements around the central array for modulating the electromagnetic waves radiated therefrom, a plurality of resistive wires attached to said support means in proximity of said parasitic elements for absorbing complex polarization radiation from said antenna pattern, additional suppport means positioned between said first support means and said central array, and a second plurality of resistive wires attached to said additional support means between said first plurality of elements and the central array to further absorb complex polarization radiation from said antenna pattern.
Claim 9
Dependent Claim
150 words
An antenna emitting a rotating multilobed pattern of radiation, comprising in combination: a drive motor, a central array having radiating elements coupled to an energizing source, a plurality of parasitic elements dispoSed to revolve around said array at a given radial distance therefrom, support means for positioning said plurality of parasitic elements and coupled to said drive motor and rotated thereby to cause rotation of said parasitic elements around the central array for modulating the electromagnetic waves radiated therefrom, a plurality of resistive wires attached to said support means in proximity of said parasitic elements for absorbing complex polarization radiation from said antenna pattern, additional suppport means positioned between said first support means and said central array, and a second plurality of resistive wires attached to said additional support means between said first plurality of elements and the central array to further absorb complex polarization radiation from said antenna pattern.
Claim 10
Dependent Claim
45 words
An antenna emitting a rotating multilobed pattern of radiation as set forth in claim 6 including a stationary radome enclosing said support means and central array and including an additional plurality of resistive wires spaced from said first plurality of elements around said stationary radome.
Claim 11
Dependent Claim
39 words
An antenna emitting a rotating multilobed pattern of radiation as set forth in claim 7 wherein said first, second and third resistive wires are positioned horizontally to minimize a horizontal polarization component from the radiation pattern of said antenna.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |