| Citation: | Jin WANG, Biao DU, Lijie SUN, Lei XIE. Design of Wideband High Performance Quad-ridge Waveguide Polarizer[J]. Journal of Electronics & Information Technology, 2019, 41(3): 611-618. doi: 10.11999/JEIT180423
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Circular polarizer is a key component in feed systems with circular polarization in radio astronomy telescope and satellite communication antennas. Conventional polarizers are capable of operating over a maximum bandwidth of 40% with an axial ratio value of 0.75 dB, which is unable to meet the growing demand for wide band applications. In this paper, the design of the wide band quad ridges waveguide polarizer is introduced, and the relationship between the phase constants of two orthogonal principal modes is analyzed. The broadband phase shift characteristics are achieved by employing different horizontal and vertical ridges dimensions. Based on this method, a C-Band polarizer is designed, which operates at 3.625～7.025 GHz, 64% bandwidth. The effects of main parameters on the polarizer performances are studied. A prototype of the polarizer is developed. The measurements of the prototype show that return losses are less than –21 dB for two orthogonal polarizations and the phase difference is 90°±3.8°, the corresponding axial ratio is less than 0.6 dB. Measured and simulated results show good agreements, thus validating the analysis and design methods.
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