Design of millimeter wave wideband circularly polarized horn antenna based on rectangular waveguide polarizer

Abstract

In this paper, a millimeter wave (mmW) wide band right-handed circularly polarized (RHCP) horn antenna is designed with a polarizer in the form of a rectangular waveguide (RW). The antenna is fed by a standard RW WR-10 waveguide port. The designed polarizer can convert the antenna excitation signal from linearly polarized (LP) to circularly polarized (CP). The antenna is analyzed, modeled and simulated. The simulation results show that the S 11 ≤-22.13dB, the axial ratio (AR) ≤3dB and the RHCP gain ≥15dBi in the range of 35.3% relative bandwidth (77GHz-110GHz). The proposed antenna is broadband and circularly polarized, and would be widely used in satellite communications and 5G mmW communications.