High-Power Wideband Elliptical-Grooved Over-Mode Circular Waveguide Polarizer

Abstract

The available polarizers either cannot afford gigawatt-class high-power microwave applications or are large in length. In this letter, a novel grooved polarizer is proposed. The grooves are proposed to be created in an over-mode circular waveguide to improve the power capacity and bandwidth. Moreover, the symmetric elliptical grooves are adopted to suppress high-order modes and realize the desired phase difference. An X-band polarizer prototype is designed and manufactured with length of 91 mm. Simulated results show that the power capacity of the polarizer is more than 1.5 GW. Measured results in accordance with simulations show that the axial ratio is less than 3 dB from 8.6 to 12.2 GHz, with relative bandwidth of 34.6%. The measured return losses are better than −12.7 dB in the same frequency range.

Accuracy and Agreement of FDTD, FEM and Wave Matrix Methods for the Electromagnetic Simulation of Waveguide Polarizers

“…Different ways of tuning waveguide polarization converters are presented in papers [57][58][59]. In [60] the results of the development of polarizers with elliptical diaphragms are presented, and in [61] a design of diaphragms in the form of grooves in a waveguide is proposed. Different designs of waveguide polarizers with plates that were integrated into the waveguide substrate are considered in [62][63][64][65].…”

Analytical modeling and optimization of new Ku‐band tunable square waveguide iris‐post polarizer

“…The polarizer's axial ratio is less than 2.2 dB. Other state‐of‐the‐art polarizer designs, which are used in 5G millimeter systems, are presented in References 68‐71. These designs provide circular polarization in the V‐band and are manufactured using 3D printing.…”