Corrugated Horn Antenna with High Isolation Using Differential Feeding Scheme

A corrugated horn antenna with high isolation based on differential feeding scheme is proposed. In order to improve the polarization isolation of the antenna, the Gysel type wideband hybrid ring is used to provide two pairs of differential signals, and the output port is connected to the metal probe through the coaxial line. The design of the corrugated horn with wide flare angle is adopted to achieve the miniaturization of the antenna. Simulated results show that the polarization isolation of the antenna is greater than 59.65dB, while measured results show that the polarization isolation of the antenna is still above 45.62dB in the working frequency band.