US3754270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Omnidirectional multibeam array antenna
Assignee: Raytheon Co
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Filing: 1972-03-24
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Granted: 1973-08-21
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Expires: 1992-03-24
Abstract
Abstract An omnidirectional multibeam array antenna assembly, for use particularly at radio frequencies, is shown. The preferred embodiment includes a circular dielectrically loaded parallelplate lens joined by radially disposed transmission lines of equal length to antenna elements disposed on a circle concentric with such lens and radio frequency switching means to permit use of the assembly in either a ''''transmit'''' or ''''receive'''' mode. The dielectric constant of the material loading the parallel plate lens and the physical diameter of the circular lens are so selected as to produce equal RF path lengths to three (or four) points on a straight line tangent to the arc of elements relative to each one of a plurality of feed ports.
Inventors
- 👤 W Thies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:13
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/007; H01Q25/008; H01Q21/00; H01Q21/0006; H01Q21/0031
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
An omnidirectional antenna assembly for radio frequency energy, such assembly comprising: a. a plurality of antenna elements disposed at equal intervals along the circumference of a circle; b. a circular parallel-plate lens concentric with the circle and having a radius less than the radius of the circle, such lens including a dielectric material, the index of refraction, k, of the dielectric material, the radius (r+d) of the circle on which the antenna elements are disposed and the radius, r, of the circular parallel-plate lens are related in accordance with the formula: k (r+d) (sin2 a/2)/(r) (1-cos a/2) where a is an angle less than 90*; c. radio frequency energy conducting means for connecting each one of the plurality of antenna elements to a different point on the periphery of the circular parallel-plate lens, the electrical length of each such conducting means being the same; and, d. circulator means, in circuit with each one of the radio frequency conducting means, for directing radio frequency energy to and from each one of the antenna elements through the parallel-plate lens.
Claim 2
Dependent Claim
177 words
An omnidirectional antenna assembly for radio frequency energy, such assembly comprising: a. a plurality of antenna elements disposed at equal intervals along the circumference of a circle; b. a circular parallel-plate lens concentric with the circle and having a radius less than the radius of the circle, such lens including a dielectric material, the index of refraction, k, of the dielectric material, the radius (r+d) of the circle on which the antenna elements are disposed and the radius, r, of the circular parallel-plate lens are related in accordance with the formula: k (r+d) (sin2 a/2)/(r) (1-cos a/2) where a is an angle less than 90*; c. radio frequency energy conducting means for connecting each one of the plurality of antenna elements to a different point on the periphery of the circular parallel-plate lens, the electrical length of each such conducting means being the same; and, d. circulator means, in circuit with each one of the radio frequency conducting means, for directing radio frequency energy to and from each one of the antenna elements through the parallel-plate lens.
Claim 3
Dependent Claim
18 words
An omnidirectional antenna as in claim 1 wherein the radio frequency conducting means are radio frequency transmission lines.
Claim 4
Dependent Claim
33 words
An omnidirectional antenna assembly as in claim 1 wherein the circular parallel-plate lens, the radio frequency conducting means and the circulator means are printed circuits on a first surface of a dielectric substrate.
Claim 5
Dependent Claim
23 words
An omnidirectional antenna assembly as in claim 3 having, additionally, an electrically conductive ground plane overlying a second surface of the dielectric substrate.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |