Abstract
Wide band planar Fabry-Perot cavity (FPC) antennas formed by an electrically thick partially reflective surface (PRS) composed of multiple metal/dielectric layers are investigated. These multiple metal and dielectric layers have been optimized to satisfy the FPC resonance condition at multiple frequencies, and hence, a larger antenna gain-bandwidth is achieved. The periodic metallic screen impedance is approximated based on its geometrical parameters and implemented as a shunt admittance in the transverse equivalent network (TEN). Two wideband FPC antennas with a single and double dielectric layers with metallic grids patterned at the bottom are designed and verified with a full-wave simulation result, with the double layer PRS leading to a wider band than the single layer one. In addition, the dispersion relation of the leaky-waves shows a quasi-oscillatory behavior versus frequency around the maximum radiated power bands.
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