Abstract

A method of achieving filtering patch antenna by loading branch nodes and increasing the bandwidth of the patch antenna by using partially reflective surface is proposed in this paper. By loading stub on the feeding line, two radiation nulls can be generated on both sides of the gain bandwidth to achieve filtering characteristics. Impedance matching of multimode patch antennas is improved and the bandwidth is increased by using partially reflective surface. The design process for improving multi-mode patch antenna impedance matching using partially reflective surface is described in detail. A broadband filtering patch antenna is designed to verify the concept. The simulated results of the proposed antenna are given. Two radiated nulls are generated at 1.76GHz and 4.6GHz. The simulated S11 of the proposed broadband filtering antenna is less than −10 dB in the range of 1.85 to 4.03 GHz and the simulated realized gain at the operating frequency range is greater than 9 dBi.

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