A Circularly Polarized Sub-THz Antenna for 6G Wireless Communication

A low profile circularly polarized antenna is proposed in this communication. The proposed antenna has four layers: radiating window, excitation layer, air cavity, and a coupling layer. Nearly square slots present in the excitation layer are key radiating element of the antenna and asymmetrical position of slots is responsible for the circular polarization. Antenna gives a realized gain of 11.9 dBic while providing efficiency of 95.1%. The fractional impedance bandwidth of 8.9% from 270-295 GHz is attained by the antenna with 3 dB axial ratio bandwidth of 12 GHz(4.3 %) from 278.2 GHz to 290.2 GHz within the band with 285 GHz as centre frequency.