US4287520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slot chevron element for periodic antennas and radomes
Assignee: United States Department of the Air Force
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Filing: 1979-11-09
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Granted: 1981-09-01
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Expires: 1999-11-09
Abstract
Abstract A periodic array for use as an electromagnetic energy resonant array or reflector having a high density pattern formed from individual chevron shaped elements. Various interlocked and interlaced patterns of elements provide the array designer with more flexibility in controlling bandwidth and stabilizing the functional relationship between frequency and the angle incidence with the electromagnetic energy. Furthermore, structural patterns of chevron shaped elements readily incorporate structural paths for lightning conduction and mechanical support without severely altering the electrical performance.
Inventors
- 👤 Robert M. Van Vliet
- 👤 William R. Bushelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:21
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/425; H01Q15/00; H01Q15/0006; H01Q15/0013
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A metallic radome, comprising: a. a curved surface of thin metallic material; b. a plurality of chevron-shaped slots in said curved surface; c. said chevron-shaped slots being formed of two linear slot elements connected end-to-end at an angle of substantially 90°; d. said chevron-shaped slots being uniformly distributed on said curved surface in a closely spaced pattern with adjacent linear slot elements parallel to each other.
Claim 2
Dependent Claim
66 words
A metallic radome, comprising: a. a curved surface of thin metallic material; b. a plurality of chevron-shaped slots in said curved surface; c. said chevron-shaped slots being formed of two linear slot elements connected end-to-end at an angle of substantially 90°; d. said chevron-shaped slots being uniformly distributed on said curved surface in a closely spaced pattern with adjacent linear slot elements parallel to each other.
Claim 3
Dependent Claim
32 words
The device of claim 1, wherein said chevron-shaped slots are spaced on said curved surface so as to provide at least one uninterrupted substantially straight line conductive pathway along said curved surface.
Claim 4
Dependent Claim
28 words
The device of claim 1 further including a dielectric layer contiguous to said curved surface, said dielectric layer having means dispersed therein for capacitively loading said chevron-shaped slots.
Claim 5
Dependent Claim
27 words
The device of claim 3 wherein said means dispersed in the dielectric layer for capacitively loading said chevron-shaped slots is a fine metallic powder made of aluminum.
References Cited (Backward Citations)
US3769623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |