Patent US3795005A successfully refreshed from Google Patents.
US3795005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad band spiral antenna
Assignee: Raytheon Co
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Filing: 1972-10-12
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Granted: 1974-02-26
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Expires: 1992-10-12
Abstract
Abstract Antenna elements for substantially circularly-polarized electromagnetic energy are shown. The disclosed elements, formed on a tapered form having an elliptical cross section, are particularly well suited for use as elements in an antenna array because such a cross-sectional shape permits individual elements to be more closely positioned with respect to each other, thereby raising the frequency of the electromagnetic energy at which grating lobes occur. In a second embodiment the eccentricity of the tapered form is relatively large, so the greater part of each antenna turn lies in a plane. Such a configuration radiates substantially linearly polarized radio frequency energy.
Inventors
- 👤 G Monser
- 👤 J Ehrhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:22
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H01Q11/083; H01Q21/00; H01Q21/06; H01Q25/00; H01Q25/007; H01Q25/008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An antenna array for substantially circularly polarized radio frequency energy, such array comprising: a. a plurality of like antenna elements, each one thereof including a phase center and a wire radiators, the active portion thereof being helically wound around the frustum of a conic-like supporting member hAving an elliptical cross section; and b. means for mounting each one of the plurality of like antenna elements in juxtaposition one to another to form an antenna array wherein the major axes of the elliptical cross sections of the conic-like supporting members are parallel one to another, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
Claim 2
Dependent Claim
113 words
An antenna array for substantially circularly polarized radio frequency energy, such array comprising: a. a plurality of like antenna elements, each one thereof including a phase center and a wire radiators, the active portion thereof being helically wound around the frustum of a conic-like supporting member hAving an elliptical cross section; and b. means for mounting each one of the plurality of like antenna elements in juxtaposition one to another to form an antenna array wherein the major axes of the elliptical cross sections of the conic-like supporting members are parallel one to another, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
Claim 3
Dependent Claim
14 words
An antenna array as in claim 1 wherein the wire radiator comprises bifilar windings.
Claim 4
Dependent Claim
30 words
An antenna array as in claim 2 wherein the end of each one of the bifilar windings adjacent to the top of the frustum is passed through the center thereof.
Claim 5
Dependent Claim
84 words
A planar antenna array for substantially circularly-polarized radio frequency energy, such array comprising: a. a plurality of like antenna elements, each one thereof having a phase center and being helically wound around the frustum of a pyramid having a hexagonal base; and b. means for mounting each one of the plurality of like antenna elements to abut one to another to form an antenna array, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
Claim 6
Dependent Claim
84 words
A planar antenna array for substantially circularly-polarized radio frequency energy, such array comprising: a. a plurality of like antenna elements, each one thereof having a phase center and being helically wound around the frustum of a pyramid having a hexagonal base; and b. means for mounting each one of the plurality of like antenna elements to abut one to another to form an antenna array, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
Claim 7
Dependent Claim
110 words
An antenna array for radio frequency energy comprising: a. a plurality of like antenna elements, each one thereof including a phase center and a wire radiator having its active portion helically wound around a tapered supporting member, any cross section of such member being a highly eccentric ellipse to cause radio frequency energy propagated from the active portion of the wire radiator to be substantially plane polarized; and b. means for mounting each one of the plurality of like antenna elements in juxtaposition one to another to form the antenna array, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
Claim 8
Dependent Claim
110 words
An antenna array for radio frequency energy comprising: a. a plurality of like antenna elements, each one thereof including a phase center and a wire radiator having its active portion helically wound around a tapered supporting member, any cross section of such member being a highly eccentric ellipse to cause radio frequency energy propagated from the active portion of the wire radiator to be substantially plane polarized; and b. means for mounting each one of the plurality of like antenna elements in juxtaposition one to another to form the antenna array, the phase centers of adjacent elements being separated by less than one-half the wavelength of the radio frequency energy.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |