US4529987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband microstrip antennas with varactor diodes
Assignee: Department of National Defence
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Filing: 1983-04-21
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Granted: 1985-07-16
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Expires: 2003-04-21
Abstract
Abstract A microstrip antenna is disclosed consisting of a flat metallic patch spaced from the ground plane. To increase the bandwidth of the antenna a pair of varactor diodes are provided positioned at opposite sides of the patch and connected between it and the ground plane.
Inventors
- 👤 Prakash Bhartia
- 👤 Inder J. Bahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:24
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0421; H01Q9/0442
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A microstrip antenna comprising in combination: a ground plane element; antenna radiating patch means positioned and spaced a small fraction of the antenna operating wavelength from said ground plane element; a dielectric layer disposed between and separating said ground plane element and said antenna radiating patch means; and at least two spatially opposed varactor diodes disposed interiorly of said dielectric layer, and each electrically connected between the ground plane element and the antenna radiating patch means.
Claim 2
Dependent Claim
76 words
A microstrip antenna comprising in combination: a ground plane element; antenna radiating patch means positioned and spaced a small fraction of the antenna operating wavelength from said ground plane element; a dielectric layer disposed between and separating said ground plane element and said antenna radiating patch means; and at least two spatially opposed varactor diodes disposed interiorly of said dielectric layer, and each electrically connected between the ground plane element and the antenna radiating patch means.
Claim 3
Dependent Claim
18 words
An antenna as set forth in claim 1 wherein said antenna radiating means comprises a flat metallic patch.
Claim 4
Dependent Claim
21 words
An antenna as set forth in claim 2 wherein said varactor diodes are connected to opposing edges of said metallic patch.
Claim 5
Dependent Claim
40 words
A microstrip antenna comprising: a ground plane; a flat metallic patch positioned adjacent said ground plane and separated therefrom; a plurality of varactor diodes connected between said ground plane and said patch and positioned at opposite edges of said patch.
Claim 6
Dependent Claim
40 words
A microstrip antenna comprising: a ground plane; a flat metallic patch positioned adjacent said ground plane and separated therefrom; a plurality of varactor diodes connected between said ground plane and said patch and positioned at opposite edges of said patch.
Claim 7
Dependent Claim
16 words
A microstrip antenna as set forth in claim 4 wherein said patch is of rectangular configuration.
Claim 8
Dependent Claim
16 words
A microstrip antenna as set forth in claim 4 wherein said patch is a circular disc.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |