Microstrip antenna structure having stacked microstrip elements
First Claim
1. A microstrip antenna, comprising:
- a ground plane;
at least two microstrip elements disposed in a stack on top of said ground plane means, wherein each microstrip element comprises a conducting plane and a layer of dielectric material;
wherein the conducting planes are dimensioned to resonate at given frequencies which are relatively close to each other and wherein at least those conducting plates intermediate of said ground plane and the uppermost conducting plane have openings therethrough sufficient in area and located relative to each other such that in operation substantial electric field coupling occurs between the microstrip elements, thereby resulting in a microstrip antenna having a broadband frequency response covering said given frequencies.
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Abstract
The structure includes a ground plane and at least two stacked microstrip elements with each microstrip element comprising a conducting plane and a layer of dielectric material. The conducting planes and the intermediate dielectric layers are configured so that they resonate at closely spaced frequencies. Each conducting plane in the structure, except the top one, includes an opening which is large enough to permit sufficient electric field coupling to occur between the microstrip elements so that the individual response characteristics of the conducting planes merge to form a broadband response characteristic. The antenna of the present invention thus has a substantially improved bandwidth over prior art microstrip antennas.
55 Citations
11 Claims
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1. A microstrip antenna, comprising:
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a ground plane; at least two microstrip elements disposed in a stack on top of said ground plane means, wherein each microstrip element comprises a conducting plane and a layer of dielectric material; wherein the conducting planes are dimensioned to resonate at given frequencies which are relatively close to each other and wherein at least those conducting plates intermediate of said ground plane and the uppermost conducting plane have openings therethrough sufficient in area and located relative to each other such that in operation substantial electric field coupling occurs between the microstrip elements, thereby resulting in a microstrip antenna having a broadband frequency response covering said given frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification