Design of a High-Gain Frequency Reconfigurable Antenna for Wireless Power Transmission

A frequency reconfigurable antenna, which consists of a single-layer planar monopole antenna, is presented in this paper. Frequency reconfiguration is achieved by switching the PIN diode that is loaded into the slots embedded in the ground plane. The antenna operates at 2.4 GHz when the PIN diode is OFF and at 2.4 GHz and 5.8 GHz when the PIN diode is ON. A piece of metal that acts as a reflector is attached to the left side of the monopole antenna, thereby increasing the gain while enabling an end-fire characteristic. This design is applicable in WPT systems as a self-powered frequency reconfigurable antenna for the wireless charging of low-power electronic devices.