US4367474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-agile, polarization diverse microstrip antennas and frequency scanned arrays
Assignee: United States Department of the Army
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Filing: 1980-08-05
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Granted: 1983-01-04
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Expires: 2000-08-05
Abstract
Abstract An inexpensive, flush mounted microstrip antenna which is frequency agile and has polarization diversity. The frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the frequency and polarization characteristics of the antenna. Frequency-agility provides frequency scannable microstrip antenna arrays which also have polarization diversity. Frequency-agility, polarization diversity and frequency scannable arrays are controllable by digital means such as a computer.
Inventors
- 👤 Daniel H. Schaubert
- 👤 Frederick G. Farrar
- 👤 Scott T. Hayes
- 👤 Arthur R. Sindoris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/14; H01Q9/145; H01Q21/00; H01Q21/24; H01Q21/245; H01Q3/00; H01Q3/44; H01Q9/0407; H01Q9/0442
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A frequency agile microstrip antenna comprising: a dielectric substrate; a square conductive patch forming an energy radiator with an active radiating region defined by the sides of the square; a conductive layer forming a ground plane on an opposed surface of said substrate; input means for providing selectable frequency radio-frequency energy inputs to said conductive patch; and means for instantaneously changing the frequency characteristics of said active radiating region including means on the perimeter of and within the perimeter of said square patch selectively energizible to provide short circuits between said patch and said conductive layer.
Claim 2
Dependent Claim
96 words
A frequency agile microstrip antenna comprising: a dielectric substrate; a square conductive patch forming an energy radiator with an active radiating region defined by the sides of the square; a conductive layer forming a ground plane on an opposed surface of said substrate; input means for providing selectable frequency radio-frequency energy inputs to said conductive patch; and means for instantaneously changing the frequency characteristics of said active radiating region including means on the perimeter of and within the perimeter of said square patch selectively energizible to provide short circuits between said patch and said conductive layer.
Claim 3
Dependent Claim
16 words
The antenna as set forth in claim 1 wherein said selectively energizible means include switching diodes.
Claim 4
Dependent Claim
19 words
The antenna as set forth in claim 1 wherein said selectively energizible means are arranged in simultaneously energizible pairs.
Claim 5
Dependent Claim
26 words
The antenna as set forth in claim 1 wherein said selectively energizible means have members only along bisectors of opposite sides of the square conductive patch.
Claim 6
Dependent Claim
16 words
The antenna as set forth in claim 3 wherein said selectively energizible means include switching diodes.
Claim 7
Dependent Claim
29 words
The antenna as set forth in either claim 3 or 5 wherein said selectively energizible means have members only along bisectors of opposite sides of the square conductive patch.
Claim 8
Dependent Claim
19 words
The antenna as set forth in claim 2 wherein said selectively energizible means are arranged in simultaneously energizible pairs.
Claim 9
Dependent Claim
29 words
The antenna as set forth in either claim 2 or 7 wherein said selectively energizible means have members only along bisectors of opposite sides of the square conductive patch.
Claim 10
Dependent Claim
19 words
The antenna as set forth in claim 4 wherein said selectively energizible means are arranged in simultaneously energizible pairs.
Claim 11
Dependent Claim
19 words
The antenna as set forth in either claim 4 or 9 wherein said selectively energizible means include switching diodes.
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) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |