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US 4,060,810 AGranted
Loaded microstrip antenna
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsJohn L. Kerr, Michael J. Timochko
Life of this patent
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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.
Claims10
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.
2 more elements
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.
1 more element
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.
1 more element
Dependencies are inferred from the claim text.