A Circular Waveguide Polarizer Based on Periodic Metallic Structure Loading

This chapter presents a circular waveguide polarizer with periodic metallic structure loading. The designed structure consists of a thick metallic structure, periodically placed in a circular waveguide to produce CP TE₁₁ mode output. In the proposed design, TE₁₁ mode is applied at port-1 of the waveguide, and the circularly polarized output at output port-2 is obtained, due to the periodic structure inside the waveguide. The designed polarizer performs linear to left-hand circular polarization over the bandwidth of 3.42-3.52 GHz, which is very useful for real-time applications. The result cantered at 3.5 GHz indicates that the proposed structure has a high power handling capability of 464 MW and an axial ratio is 1.5 dB. The estimated E-field ensures that the proposed design can handle a high input power signal. This property makes the polarizer useful for space applications, microwave devices, airborne and high-power microwave systems.