A Design of Dual-Polarized Composite Patch-Monopole Antenna With Reconfigurable Radiation Pattern

This paper describes a design of dual-polarized composite patch-monopole antenna withreconfigurable radiation pattern. The design consists of a double differential-feed patch loaded with fourvertical monopoles symmetrically. The monopoles are connected to or disconnected from the groundplane (GND) by changing the ON/OFF states of p-i-n diodes. By adjusting the connections between themonopoles and GND, the pattern reconfigurability (i.e., one widebeam and three narrow-beam modes) canbe achieved for each polarization. The proposed antenna can switch the beam in two dimensions separately(xz-andyz-plane). The proposed antenna is characterized computationally and validated experimentally.The measurements result in an overlapping 10-dB return-loss bandwidth of2.40-2.51GHz and a port-to-port isolation >= 20dB in all the modes. In the far field, the prototype can deploy switched beamflexibility. Its radiation characteristics are confirmed by the far-field measurements, which shows thereconfigurable patterns for both polarizations.