Waveguide Iris Polarizers for Ku-band Satellite Antenna Feeds

Автор(ы) S.I. Piltyay, A.V. Bulashenko, I.V. Demchenko

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 37, Peremohy Ave., 03056 Kyiv, Ukraine

Е-mail crosspolar@ukr.net
Выпуск Том 12, Год 2020, Номер 5
Даты Received 24 July 2020; revised manuscript received 15 October 2020; published online 25 October 2020
Ссылка S.I. Piltyay, A.V. Bulashenko, I.V. Demchenko, J. Nano- Electron. Phys. 12 No 5, 05024 (2020)
DOI https://doi.org/10.21272/jnep.12(5).05024
PACS Number(s) 84.40.Az, 84.40.Ua
Ключевые слова Polarizer, Waveguide (7) , Iris, Circular polarization, Differential phase shift, Axial ratio, Crosspolar discrimination, Satellite antennas, Antenna feed.

At the present day, antennas and signals with dual or single circular polarizations are widely used in modern satellite telecommunication systems, television systems, satellite navigation systems, civil and military radars, mobile communication systems, wireless identification systems and wireless data networks. The widespread application of signals with circular polarizations is caused by their advantages over signals with polarization of other types. The key element of antenna systems with circular polarizations is a polarizer. It is a microwave device, which performs the transformation of the circularly polarized electromagnetic waves into the linearly polarized waves or vice versa. The combination of a polarizer and an orthomode transducer in the antenna feeds carries out the full conversion of two signals with orthogonal circular polarizations and their transmission to the isolated waveguide ports. This article presents results of the development, optimization and analysis of new designs of compact polarizers based on a square waveguide with irises. The characteristics of polarizers with different number of irises have been optimized for the operation in Ku-band 10.7-12.8 GHz. The electromagnetic characteristics of the waveguide polarizers were simulated and optimized using finite integration technique. The evolution of sizes of optimal polarizer designs and improvement of their performance have been analyzed for the polarizers with 3 and 4 irises. The better characteristics among the investigated waveguide iris polarizer designs are provided by the polarizer with 4irises. Developed compact square waveguide polarizer with 4irises provides highly-efficient performance in the operating Ku-band 10.7-12.8 GHz and can be widely used in modern antenna feeds for satellite information systems.

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