Optimum septum polarizer design for various fractional bandwidths

Fedor F. Dubrovka; Stepan I. Piltyay; Roman R. Dubrovka; M. M. Lytvyn; S. M. Lytvyn

doi:10.3103/S0735272720010021

Authors

Fedor F. Dubrovka National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine https://orcid.org/0000-0002-3485-6822
Stepan I. Piltyay National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine https://orcid.org/0000-0002-6927-8663
Roman R. Dubrovka National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine https://orcid.org/0000-0003-0051-4784
M. M. Lytvyn National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine
S. M. Lytvyn National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine

DOI:

https://doi.org/10.3103/S0735272720010021

Keywords:

septum polarizer, orthomode transducer, circular polarization, fractional frequency bandwidth, cross-polarization discrimination, isolation, return losses

Abstract

The numerical optimization results of constant thickness septum polarizer’s performances for various operating fractional bandwidths (FBW) are presented in the paper. The polarizer’s structure includes a common input square waveguide, a constant thickness septum with several steps, and two output rectangular waveguides. The polarizer design of 2-, 3-, 4-, and 5-step septums is optimized for different narrow and wide operating FBWs to obtain the simultaneously maximum values of cross-polarization discrimination and isolation between rectangular ports and return losses. The optimized dimensions of the septums for FBW = 5, 10, 15, 18, and 20% are presented. Based on the obtained results, Q- and K-band prototypes were manufactured and their performances were measured. The measurements of the prototypes are in good agreement with simulations. These optimization results can be widely used for the development of septum polarizers and prediction of their performances for various FBW in the required frequency range.

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