Frequency Selective Surface to Improve the Gain of the Patch Antenna
نویسنده
چکیده
The surface wave losses in the patch antenna reduces the bandwidth and gain of the patch antenna. This problem is overcame by use of frequency selective surface. the FSS has a variety of applications in antennas. The FSS is constructed with periodic arrays of metallic patches of arbitrary geometries or slots within metallic screens. FSS geometries are designed by rings, square loops and fractal shapes. Because the substrate thickness of a patch antenna is usually much smaller than a half-wavelength in the dielectric material, the ground plane of the patch antenna destroys the patch antenna performance. The FSS structure has a phenomenon with high impedance surface that reflects the plane wave in-phase and suppresses surface wave. The impact of a FSS on patch antenna performance depends on the geometry, element periodicity, and the electrical properties of the substrate materials.
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