US4132995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity backed slot antenna
Assignee: Raytheon Co
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Filing: 1977-10-31
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Granted: 1979-01-02
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Expires: 1997-10-31
Abstract
Abstract A radio frequency antenna having a flared, discontinuous slot formed on one surface of a dielectric support structure and a feed formed on the opposite surface of such structure. The feed is disposed across a narrow portion of the slot. A housing having a cavity formed therein is provided. The dielectric support is disposed on the housing over the cavity. The cavity has a conductive wall, or deflective plate, disposed beneath a wide portion of the slot. The effects of the feed and the slot-deflection plate combine to provide a flush-mountable antenna having a cardioid-shaped radiation pattern.
Inventors
- 👤 George J. Monser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/286; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A radio frequency antenna, comprising: (a) a dielectric support structure; (b) a conductive sheet having a flared, discontinuous slot formed therein, such slot being disposed on one surface of the support structure; (c) a feed for coupling radio frequency energy across a narrow portion of the flared slot; and (d) a housing having: a cavity with conductive walls formed therein, the dielectric support structure being mounted to the housing to provide a cover for such cavity; and a deflection plate forming a wall of such cavity, such deflection plate being disposed at an acute angle with respect to the dielectric support structure and beneath a wide portion of the slot.
Claim 2
Dependent Claim
110 words
A radio frequency antenna, comprising: (a) a dielectric support structure; (b) a conductive sheet having a flared, discontinuous slot formed therein, such slot being disposed on one surface of the support structure; (c) a feed for coupling radio frequency energy across a narrow portion of the flared slot; and (d) a housing having: a cavity with conductive walls formed therein, the dielectric support structure being mounted to the housing to provide a cover for such cavity; and a deflection plate forming a wall of such cavity, such deflection plate being disposed at an acute angle with respect to the dielectric support structure and beneath a wide portion of the slot.
Claim 3
Dependent Claim
30 words
The radio frequency antenna recited in claim 1 wherein the dielectric support structure is planar and the deflection plate makes a forty-five degree angle with the plane of the support.
Claim 4
Dependent Claim
20 words
The radio frequency antenna recited in claim 1 wherein a conductor is disposed across the narrow portion of the slot.
Claim 5
Dependent Claim
23 words
The radio frequency antenna recited in claim 3 wherein the feed is disposed between the conductor and a discontinuity region of the slot.
Claim 6
Dependent Claim
20 words
The radio frequency antenna recited in claim 4 wherein the feed is formed on a surface of the support structure.
Claim 7
Dependent Claim
32 words
The radio frequency antenna recited in claim 1 wherein the feed is displaced from the discontinuity region a length less than λc/2 when λc is the nominal operating wavelength of the antenna.
Claim 8
Dependent Claim
23 words
The radio frequency antenna recited in claim 6 wherein the feed is displaced from the discontinuity a length in the order of λc/4.
Claim 9
Dependent Claim
83 words
A radio frequency antenna comprising: (a) a dielectric support structure having: a conductive sheet with a flared, discontinuous slot therein, such slot being formed on one surface of the structure; and a feed formed on the opposite surface of the support, such feed being disposed across a narrow portion of the slot; and (b) a housing having a cavity formed therein, the dielectric support being disposed over the cavity, such cavity having a conductive wall disposed beneath a wide portion of the slot.
Claim 10
Dependent Claim
83 words
A radio frequency antenna comprising: (a) a dielectric support structure having: a conductive sheet with a flared, discontinuous slot therein, such slot being formed on one surface of the structure; and a feed formed on the opposite surface of the support, such feed being disposed across a narrow portion of the slot; and (b) a housing having a cavity formed therein, the dielectric support being disposed over the cavity, such cavity having a conductive wall disposed beneath a wide portion of the slot.
References Cited (Backward Citations)
US2885676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |