A Fast and Accurate Design Method for the Smooth-walled Horn Antenna with a High Gaussian Coupling Efficiency

A design methodology for antenna with a high Gaussian coupling efficiency is proposed in this paper. Both mode coupling theory and commercial full-wave simulator are utilized in our design method, making the antenna design process fast and accurate. As a demonstration, a smooth-walled horn antenna working at 220 GHz has been simulated, fabricated and measured. Both simulated and measured results show that the designed horn exhibit high symmetric, low sidelobe patterns in both E-plane and H-plane, which verify the proposed design method.