| 摘要 |
A miniaturized, circularly polarized SDS patch antenna. Generally, the inventive antenna includes a ground plane over which a first patch is disposed. A short is provided between a first edge of the first patch and ground plane. A second patch is disposed over said first patch. A second short is provided between a first edge of the second patch and the first patch. The patch antenna of the illustrative embodiment further includes a first volume of dielectric disposed between the ground plane and the first patch. A second volume of dielectric is disposed between the first patch and the second patch. In the illustrative embodiment, the edges are shorted orthogonally. In an alternative embodiment, the shorted edges are in substantially parallel alignment. In yet another alternative embodiment, the antenna is designed for dual frequency operation. In the best mode, the area of the first patch is greater than the area of the second patch. In the illustrative application, high dielectric substrates and vertical shorting walls are combined to implement a compact circularly polarized patch antenna for use in low frequency applications. Two different high dielectric substrates are utilized to achieve a compact footprint with a stacked structure. The use of vertical shorting walls affords a substantial reduction in size while providing quarter-wave operation in both orthogonal directions. The coaxial feed position on the diagonal effects a rotation of the fields in a circular manner from the upper layer to lower layer.
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