Abstract
A wideband microstrip patch antenna is proposed in this communication for pattern diversity application. Broadside and omnidirectional radiation patterns are generated by the odd and even modes of a single circular patch. A compact feeding network based on coplanar waveguide is designed to provide in-phase and out-of-phase excitations, which can excite the two modes in wide bandwidth. The size of the feeding network is only $35 \times 14.5$ mm2. A prototype of the proposed antenna is fabricated and tested. The measured overlapped bandwidth ( $\vert \text{S}_{11}\vert dB and $\vert \text{S}_{22}\vert dB) achieves 775 MHz (2.165–2.94 GHz) or 31% corresponding to the center frequency. The Port isolation is below −28 dB in the entire bandwidth.
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