Design of a terahertz circularly polarized quasi-diagonal horn antenna based on MEMS technology

This paper proposes a terahertz(THz) circularly polarized quasi-diagonal horn antenna, which is composed of several etched silicon layers. Through adding the antipodal transition structure, we can obtain good circular polarization performance. The simulated result reveals that the bandwidth for axial ratio below 2dB from 490 GHz to 500 GHz. The return loss below −23dB from 490GHz to 500GHz. Good symmetric Gaussian beam and low cross-polarization are shown in the radiation pattern. The peak gain is higher than 23dBi from 490GHz to 500GHz. The proposed THz circularly polarized waveguide-fed horn antenna is suitable for THz imaging and communication systems.