US4054876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity antenna
Assignee: United States Department of the Navy
•
Filing: 1976-03-01
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Granted: 1977-10-18
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Expires: 1996-03-01
Abstract
Abstract A cavity antenna having an aperture which may be mounted flush to the gro plane. A chamber positioned above a rectangular resonant cavity allows the antenna to achieve normal bandwidth and normal gain with a very thin cavity depth.
Inventors
- 👤 Gary R. Hoople
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:42
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
120 words
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow the radiation of said electromagnetic energy into free space wherein the improvement comprises: a. a chamber located at the top of said cavity and interposed between said input channel and said cavity and commuting interiorly therewith; b. a metallic probe positioned interior to said chamber, said chamber being dimensioned such that the reactive component of impedance due to the combined effects of said chamber and said probe is inductive in an amount to negate the susceptive component of admittance of said cavity; and c. said probe in electrical connection with said coaxial cable.
Claim 2
Dependent Claim
120 words
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow the radiation of said electromagnetic energy into free space wherein the improvement comprises: a. a chamber located at the top of said cavity and interposed between said input channel and said cavity and commuting interiorly therewith; b. a metallic probe positioned interior to said chamber, said chamber being dimensioned such that the reactive component of impedance due to the combined effects of said chamber and said probe is inductive in an amount to negate the susceptive component of admittance of said cavity; and c. said probe in electrical connection with said coaxial cable.
Claim 3
Dependent Claim
36 words
An antenna as described in claim 1 wherein said antenna additionally comprises: a. a block of dielectric material; b. said block surrounding said probe to insulate said probe electrically from said chamber and from said cavity.
Claim 4
Dependent Claim
60 words
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow radiation of said electromagnetic energy into free space, the improvement comprising: a. a chamber located at the top of said cavity and interposed between said input channel and said cavity communting interiorly therewith;
Claim 5
Dependent Claim
60 words
In an antenna of the type having an input channel to receive electromagnetic energy transmitted by a coaxial cable and a cavity having an aperture to allow radiation of said electromagnetic energy into free space, the improvement comprising: a. a chamber located at the top of said cavity and interposed between said input channel and said cavity communting interiorly therewith;
Claim 6
Dependent Claim
17 words
b. a metallic probe positioned interior to said chamber and electrically connected with said coaxial cable; and
Claim 7
Dependent Claim
17 words
b. a metallic probe positioned interior to said chamber and electrically connected with said coaxial cable; and
Claim 8
Dependent Claim
34 words
c. a block of dielectric material surrounding said probe to insulate said probe electrically from said chamber and from said cavity, said block being so dimensioned as to fill the interior of said chamber.
Claim 9
Dependent Claim
34 words
c. a block of dielectric material surrounding said probe to insulate said probe electrically from said chamber and from said cavity, said block being so dimensioned as to fill the interior of said chamber.
Claim 10
Dependent Claim
23 words
An antenna as described in claim 3 wherein the axis of said chamber top is coaxial with the transverse axis of said cavity.
Claim 11
Dependent Claim
25 words
An antenna as described in claim 4 wherein said cavity additionally comprises a metallic stub at the bottom of said cavity protruding into said cavity.
Claim 12
Dependent Claim
22 words
An antenna as described in claim 5 wherein the bottom of said block of dielectric material abuts the top of said stub.
Claim 13
Dependent Claim
53 words
An antenna as described in claim 6 wherein said input channel comprises: a. a platform of non-conducting material having a passageway therethrough for said coaxial cable; b. said platform located atop said chamber; and c. said chamber having a hole through its top portion to provide for passage of said coaxial cable therethrough.
Claim 14
Dependent Claim
19 words
An antenna as described in claim 7 wherein a removable metallic wall comprises the front portion of said chamber.
Claim 15
Dependent Claim
16 words
An antenna described in claim 8 wherein said cavity has a depth of 0.020 cavity wavelength.
Claim 16
Dependent Claim
20 words
An antenna as described in claim 9 wherein said block of dielectric material has a relative dielectric constant of 4.3.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |