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Higher-Symmetries for Broadband Reflecting Luneburg Lenses at Ka-band

Abstract : This paper reports the application of higher symmetries to the design of a Reflecting Luneburg Lens (RLL) with broadband response. RLLs consist of two circular parallel plate waveguides (PPWs) vertically stacked. The bottom PPW is filled with an azimuthally symmetric graded index (GRIN) medium. Owing to this GRIN medium, the wave launched by a primary feed in the bottom PPW is collimated in the top one, so that a plane wave with a different propagation direction is generated for any azimuthal position of the source. In this work, the GRIN medium in the bottom PPW is implemented by higher symmetry unit-cells consisting of metallic inclusions. This type of unit-cell achieves the required effective refractive index profile with reduced frequency dispersion, thus increasing the operational bandwidth of the lens. The proposed architecture constitutes a low-profile beam-forming solution that also provides complete azimuthal scanning in a wide frequency range. Moreover, it remains completely metallic, thus benefitting from structural robustness and reduced losses.
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https://hal.archives-ouvertes.fr/hal-03770691
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Saturday, November 26, 2022 - 8:29:52 AM
Last modification on : Monday, November 28, 2022 - 9:25:11 AM

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  • HAL Id : hal-03770691, version 1

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C. Bilitos, J. Ruiz-Garcia, R Sauleau, E Martini, S. Maci, et al.. Higher-Symmetries for Broadband Reflecting Luneburg Lenses at Ka-band. 16th European Conference on Antennas and Propagation (EuCAP), Mar 2022, Madrid, Spain. ⟨hal-03770691⟩

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