US3613098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically small cavity antenna
Assignee: Lockheed Martin Corp
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Filing: 1969-05-12
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Granted: 1971-10-12
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Expires: 1989-05-12
Abstract
Abstract An electrically small cavity antenna especially adapted for flush mounting in an aircraft vertical stabilizer. A cavity is formed in the vertical stabilizer so as to have a pair of radiation windows or apertures on opposite sides of the stabilizer. An energy coupling device is placed substantially in the center of the cavity to couple energy from a feeding network to the cavity. The energy coupling device includes a pair of spaced-apart plates with a tapered portion disposed between the plates. Energy is coupled from the feed network to one of the plates and the narrow end or apex of the tapered portion.
Inventors
- 👤 John Joseph Blasko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:12
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/286; H01Q1/287; H01Q1/282; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A cavity antenna comprising a cavity enclosure having first anD second apertures on opposite sides thereof; an energy coupling device including first and second electrically conductive plates an electrically conductive tapered portion having a narrow end supported adjacent the first plate and a wide end which is attached to and covered by the second plate; means for supportably mounting said coupling device substantially in the center of the cavity with the first and second plates facing the first and second cavity apertures, respectively; and energy feeding means having separate connections to the first plate and to the narrow end of the tapered portion.
Claim 2
Dependent Claim
103 words
A cavity antenna comprising a cavity enclosure having first anD second apertures on opposite sides thereof; an energy coupling device including first and second electrically conductive plates an electrically conductive tapered portion having a narrow end supported adjacent the first plate and a wide end which is attached to and covered by the second plate; means for supportably mounting said coupling device substantially in the center of the cavity with the first and second plates facing the first and second cavity apertures, respectively; and energy feeding means having separate connections to the first plate and to the narrow end of the tapered portion.
Claim 3
Dependent Claim
26 words
The invention according to claim 1 wherein said tapered portion has a conical outer surface, said narrow end corresponding to the apex of said conical surface.
Claim 4
Dependent Claim
26 words
The invention according to claim 1 wherein said tapered portion has a multisided outer surface, said narrow end corresponding to an apex of said multisided surface.
Claim 5
Dependent Claim
41 words
The invention according to claim 2 wherein said cavity is formed in the vertical stabilizer of an aircraft, the cavity apertures being located on opposite sides of said stabilizer such that the cavity extends between the apertures and through said stabilizer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |