A 325–500 GHz high gain antenna for terahertz applications

This paper reports a 325–500 GHz antenna for terahertz applications. A novel highly integrated radiation structure including an E-plane flare and dual H-plane reflectors are proposed in the design for achieving high radiation gains. A terahertz horn antenna that is excited by using a standard WR2.2 waveguide is adopted as the primary feeder for the proposed antenna. To verify the design, a 325–500 GHz prototype is fabricated by using a low cost commercial milling technology. Experiment results show that the measured antenna has a maximum gain of 32.0 dBi at 500 GHz. In addition, in the 325–500 GHz frequency band, the measured prototype has a return loss larger than 20 dB, a gain higher than 26.5 dBi, and a high radiation efficiency over 43.75 %. The proposed antenna provides a low cost and high performance solution for developing terahertz antennas.