A new method for synthesis and designing transmissive linear-to-circular polarization converters based on branch line circuit model
Siyar, Davood; Aliakbarian, Hadi; Soh, Ping Jack (2024-05-15)
Taylor & Francis
15.05.2024
Siyar, D., Aliakbarian, H., & Soh, P. J. (2024). A new method for synthesis and designing transmissive linear-to-circular polarization converters based on branch line circuit model. Journal of Electromagnetic Waves and Applications, 38(9), 955–968. https://doi.org/10.1080/09205071.2024.2350431
https://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright © 2024 Informa UK Limited. This is an Accepted Manuscript version of the following article, accepted for publication in Journal of Electromagnetic Waves and Applications. Siyar, D., Aliakbarian, H., & Soh, P. J. (2024). A new method for synthesis and designing transmissive linear-to-circular polarization converters based on branch line circuit model. Journal of Electromagnetic Waves and Applications, 38(9), 955–968. It is deposited under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
https://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright © 2024 Informa UK Limited. This is an Accepted Manuscript version of the following article, accepted for publication in Journal of Electromagnetic Waves and Applications. Siyar, D., Aliakbarian, H., & Soh, P. J. (2024). A new method for synthesis and designing transmissive linear-to-circular polarization converters based on branch line circuit model. Journal of Electromagnetic Waves and Applications, 38(9), 955–968. It is deposited under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
https://creativecommons.org/licenses/by-nc-nd/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202406134489
https://urn.fi/URN:NBN:fi:oulu-202406134489
Tiivistelmä
Abstract
This paper proposes a new design method of a linear-to-circular polarization converter based on the branch line circuit model. The series branches are implemented by dielectric spacers and the shunt branches are implemented by anisotropic admittance sheets. The admittance matrix of the anisotropic admittance sheets is derived by even and odd mode analysis. A unit cell consisting of two metal layers and a dielectric spacer is then designed using an iterative algorithm for operation from 15.5 to 23 GHz. Results indicate that the axial ratio and insertion loss of the designed polarizer are better than 3 and 1.5 dB respectively, for incident angles between ±45°. To validate the simulation results, a waveguide-based test setup is designed and fabricated, with measurement results indicating good agreement with simulations. The proposed method can be potentially applied to design other anisotropic structures such as half-plate polarizers and polarization rotators.
This paper proposes a new design method of a linear-to-circular polarization converter based on the branch line circuit model. The series branches are implemented by dielectric spacers and the shunt branches are implemented by anisotropic admittance sheets. The admittance matrix of the anisotropic admittance sheets is derived by even and odd mode analysis. A unit cell consisting of two metal layers and a dielectric spacer is then designed using an iterative algorithm for operation from 15.5 to 23 GHz. Results indicate that the axial ratio and insertion loss of the designed polarizer are better than 3 and 1.5 dB respectively, for incident angles between ±45°. To validate the simulation results, a waveguide-based test setup is designed and fabricated, with measurement results indicating good agreement with simulations. The proposed method can be potentially applied to design other anisotropic structures such as half-plate polarizers and polarization rotators.
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