Optimal designs of X-band waveguide stepped-thickness septum polarizer

Autor: F. F. Dubrovka, S. I. Piltyay, R. R. Dubrovka, M. M. Lytvyn, S. M. Lytvyn
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Radioelectronics and Communications Systems; Vol. 64 No. 9 (2021): 100th anniversary of professor Ya. S. Shifrin; 494-500
Radioelectronics and Communications Systems; Том 64 № 9 (2021): 100th anniversary of professor Ya. S. Shifrin; 494-500
ISSN: 0735-2727
1934-8061
Popis: This article presents results of optimization and development of X-band square waveguide stepped-thickness septum polarizers. Electromagnetic characteristics of the polarizers were simulated and optimized numerically using finite elements method. Optimal dimensions of the 2-, 3-, and 4-section stepped-thickness septum polarizers for various fractional bandwidths have been obtained. It is demonstrated that application of the stepped-thickness septum with 3 sections instead of it constant-thickness counterpart improves return loss and cross-polarization discrimination of the septum polarizer by 2–6 dB and 3–6 dB respectively, depending on fractional bandwidth. A prototype of the optimal waveguide polarizer with 3-section stepped-thickness septum configuration for the operating frequency range 7.70–8.50 GHz was developed, manufactured and tested. Measured values of VSWR and cross-polar discrimination of the prototype together with necessary transitions and bends within the stated above frequency range are less than 1.4 and higher than 30 dB, respectively. The developed compact stepped-thickness septum polarizer is a good candidate to be applied in the quasi-monopulse dual-circular polarization feed system of the ground station reflector antenna for tracking earth observing satellites.
Databáze: OpenAIRE
Externí odkaz: