US4605933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended bandwidth microstrip antenna
Assignee: Lockheed Martin Corp
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Filing: 1984-06-06
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Granted: 1986-08-12
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Expires: 2004-06-06
Abstract
Abstract A microstrip antenna having approximately an octave bandwidth comprises a planar radiating element disposed approximately coplanar with and in front of an upper ground plane and spaced above a lower ground plane at a distance equal to approximately one-tenth wavelength at the lowest operating frequency (one-quarter wavelength at the upper operating frequency). A thin dielectric layer is disposed on top of the upper ground plane which is coupled to the lower ground plane. The antenna, which is linearly polarized, is fed from the rear by a launcher that is approximately coplanar with the radiating element and mounted above the dielectric layer. Impedance matching means are provided for improved performance.
Inventors
- 👤 Frank D. Butscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:06
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A microstrip antenna having extended bandwidth comprising: (a) a first conducting ground plane; (b) a second conducting ground plane disposed parallel to and above said first ground plane, said second ground plane being smaller than said first ground plane and disposed above the rear of said first ground plane; said second ground plane being electrically connected to said first ground plane; (c) a thin dielectric layer disposed on said second ground plane, (d) a planar radiating element disposed above said first ground plane, said planar radiating element being disposed approximately coplanar with, in front of, and electrically separated from said second ground plane, and; (e) means for feeding said planar radiating element, said means for feeding being disposed above said second ground plane on said dielectric layer, said means for feeding providing an approximately coplanar feed and a linearly polarized signal to said planar radiating element.
Claim 2
Dependent Claim
146 words
A microstrip antenna having extended bandwidth comprising: (a) a first conducting ground plane; (b) a second conducting ground plane disposed parallel to and above said first ground plane, said second ground plane being smaller than said first ground plane and disposed above the rear of said first ground plane; said second ground plane being electrically connected to said first ground plane; (c) a thin dielectric layer disposed on said second ground plane, (d) a planar radiating element disposed above said first ground plane, said planar radiating element being disposed approximately coplanar with, in front of, and electrically separated from said second ground plane, and; (e) means for feeding said planar radiating element, said means for feeding being disposed above said second ground plane on said dielectric layer, said means for feeding providing an approximately coplanar feed and a linearly polarized signal to said planar radiating element.
Claim 3
Dependent Claim
36 words
A microstrip antenna as recited in claim 1 wherein said planar radiating element is disposed electrically a distance approximately equal to one-quarter wavelength at the lowest operating frequency of said antenna above said first ground plane.
Claim 4
Dependent Claim
36 words
A microstrip antenna as recited in claim 1 wherein said planar radiating element is disposed electrically a distance approximately equal to one-tenth wavelength at the highest operating frequency of said antenna above said first ground plane.
Claim 5
Dependent Claim
43 words
A microstrip antenna as recited in claim 2 further including (a) an impedance matching collar extending between said first ground plane and said planar radiating element, said collar being normal to the planes of said first ground plane and said planar radiating element.
Claim 6
Dependent Claim
16 words
A microstrip antenna as recited in claim 2 wherein said planar radiating element is a disk.
Claim 7
Dependent Claim
31 words
A microstrip antenna as recited in claim 5 wherein an impedance matching collar is disposed beyond the midpoint of said disk radiating element toward the front of said disk radiating element.
Claim 8
Dependent Claim
29 words
A microstrip antenna as recited in claim 6 including an impedance matching tab extending from said first ground plane to the region in front of said disk radiating element.
Claim 9
Dependent Claim
24 words
A microstrip antenna as recited in claim 1 further including a second dielectric layer disposed between said first ground plane and said radiating element.
Claim 10
Dependent Claim
36 words
A microstrip antenna as recited in claim 8 wherein said planar radiating element is disposed electrically a distance approximately equal to one-quarter wavelength at the highest operating frequency of said antenna above said first ground plane.
Claim 11
Dependent Claim
43 words
A microstrip antenna as recited in claim 8 further including (a) an impedance matching collar extending between said first ground plane and said planar radiating element, said collar being normal to the planes of said first ground plane and said planar radiating element.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |