Four-Element Beam Switching Antenna for Compact IoT Devices

This work presents a pattern reconfigurable antenna system at X-band for the Internet of Thing (IoT) devices. The system is composed of a printed circular array composed of four Yagi-Uda elements and an electrically controlled feeding network. The feeding network incorporates PIN diode RF switches that provide independent activation of each antenna element while maintaining overall system matching stability. The suggested technique results in pattern reconfigurability between 16 modes. The isolation between the elements is improved by incorporating a reflector between them. Simulation results reveal that such a pattern flexible antenna is a strong candidate for IoT devices in a multipath environment.