In this Communication, a simple hexagonal shape frequency reconfigurable antenna is designed with reduced ground plane for new C-band 5G (3.7GHz-3.98GHz applications. To enable frequency reconfiguration a PIN diode is adopted in the reduced ground plane with a gap size of 1mm. When diode is in OFF state the designed antenna resonates at 3.6 GHz with a bandwidth of 760 MHz, range used for Wi-Max and in ON state the designed structure resonates at 3.8 GHz with a bandwidth of 930 MHz, range used for New C-band 5G networks. The designed structure of an antenna is etched on a Fr-4 substrate with a size of 38X36X1.6mm3.
