Abstract
A single square patch antenna for pattern diversity is investigated. The proposed antenna consists of a double-feed square patch antenna with a rat-race network. By switching the feeding ports, the different radiation patterns for two modes ( TM10 mode and the capacitive-loaded monopole radiating mode) operating over an overlapped frequency band from 1.88 to 2.34 GHz are achieved. TM10 mode reveals good broadside radiation patterns, and the capacitive-loaded monopole radiating mode shows conical radiation patterns. The antenna is fabricated and tested. The measured gains across the common frequency band are 8.9-9.9 and 2.8-3.8 dBi for TM10 mode and the capacitive-loaded monopole radiating mode, respectively. Moreover, the measured bandwidths of -10-dB reflection coefficient are 750 MHz (1.59-2.34 GHz, 38.2%) for TM10 mode and 880 MHz (1.88-2.76 GHz, 37.9%) for the capacitive-loaded monopole radiating mode. High isolation (<; -20 dB ) between the two feeding ports for the common impedance matching band is achieved. These results make the single dual-port patch antenna an attractive solution for 3G/4G pattern diversity applications such as in gym scenarios.
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