US4060810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loaded microstrip antenna
Assignee: United States Department of the Army
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Filing: 1976-10-04
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Granted: 1977-11-29
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Expires: 1996-10-04
Abstract
Abstract A microstrip antenna design according to which the resonant frequency can substantially reduced for a given size radiator, or to which the size of the radiator can be reduced for a given resonant frequency. As will be seen, a microstrip antenna loading is accomplished through the removal of a central portion of the etched metal radiator, and the amount of loading is a function of the size of the central portion removed.
Inventors
- 👤 John L. Kerr
- 👤 Michael J. Timochko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:48
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board; a microstrip transformer etched on said opposite side of said board continuous with said patch at the center of one side for coupling a transmission line and matching impedance to the patch; said patch being continuous thereacross except for the removal of a relatively large portion in the central region thereof, so that current flow across the patch is forced to deviate around the area of removal and therefore have a longer path, which lowers the resonant frequency of radiation.
Claim 2
Dependent Claim
121 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board; a microstrip transformer etched on said opposite side of said board continuous with said patch at the center of one side for coupling a transmission line and matching impedance to the patch; said patch being continuous thereacross except for the removal of a relatively large portion in the central region thereof, so that current flow across the patch is forced to deviate around the area of removal and therefore have a longer path, which lowers the resonant frequency of radiation.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein the patch portion removed is substantially square in cross section.
Claim 4
Dependent Claim
88 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board, said patch being continuous thereacross except for the removal of a portion in the central region thereof; wherein said circuit board and metallic ground plane are also continuous, except for the removal of a portion thereof substantially coextensive with the removal of said patch portion etched thereupon.
Claim 5
Dependent Claim
88 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board, said patch being continuous thereacross except for the removal of a portion in the central region thereof; wherein said circuit board and metallic ground plane are also continuous, except for the removal of a portion thereof substantially coextensive with the removal of said patch portion etched thereupon.
Claim 6
Dependent Claim
24 words
The apparatus of claim 3 wherein the patch portion, circuit board portion and ground plane portion removed are each substantially square in cross section.
Claim 7
Dependent Claim
76 words
The apparatus of claim 3 wherein there is additionally included a second circuit board of dielectric material and a second radiating element in the form of a patch of metal etched on one side thereof, and wherein said second circuit board is affixed to said one side of said first circuit board and in a manner to align said second radiating element with the portion of said first circuit board and said metallic ground plane removed.
Claim 8
Dependent Claim
23 words
The apparatus of claim 5 wherein said second circuit board of dielectric material is thinner than said first circuit board of dielectric material.
Claim 9
Dependent Claim
52 words
The apparatus of claim 3 wherein there is additionally included a second radiating element in the form of a horn affixed to said one side of said circuit board and in a manner to align said second radiating element with the portion of said circuit board and said metallic ground plane removed.
Claim 10
Dependent Claim
98 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board, said patch being continuous thereacross except for the removal of a portion in the central region thereof; wherein there is additionally included a second, different radiating element in the form of a patch of metal superimposed on said opposite side of said circuit board in the region of removal of a portion of said first radiating element.
Claim 11
Dependent Claim
98 words
In a microstrip antenna, apparatus comprising: a circuit board of dielectric material having a metallic ground plane on one side thereof; and a radiating element in the form of a patch of metal etched on the opposite side of said board, said patch being continuous thereacross except for the removal of a portion in the central region thereof; wherein there is additionally included a second, different radiating element in the form of a patch of metal superimposed on said opposite side of said circuit board in the region of removal of a portion of said first radiating element.
Claim 12
Dependent Claim
22 words
The apparatus of claim 8 wherein said first and second metal patches are oriented to provide like polarizations of signals radiated thereby.
Claim 13
Dependent Claim
22 words
The apparatus of claim 8 wherein said first and second metal patches are oriented to provide orthogonal polarizations of signals radiated thereby.
References Cited (Backward Citations)
US3778717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |