Characterization of a Displaced Coaxial Feed for Cascaded Cylindrical Metasurfaces
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913461467873280 |
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| author | Lin, Chun-Wen Ziolkowski, Richard W. Grbic, Anthony |
| author_facet | Lin, Chun-Wen Ziolkowski, Richard W. Grbic, Anthony |
| contents | This paper characterizes a realistic feed for cylindrical metasurfaces, allowing it to be included in metasurface design. Specifically, it investigates a coaxial feed which is displaced from the center (off-center) of concentrically-cascaded cylindrical metasurfaces. Formulas are reported to quickly compute the multimodal S-matrix (scattering properties) of a displaced feed from that of the central feed. The theory is rigorously derived based on the addition theorem of Hankel functions for all azimuthal modes. Moreover, the resulting multimodal S-matrix is combined with the multimodal wave matrix theory used to model cylindrical metasurfaces, allowing devices to be designed that realize arbitrary field transformations from a displaced coaxial feed. A design example is reported, which opens new opportunities in the realization of realistic, high-performance cylindrical-metasurface-based devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_03949 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Characterization of a Displaced Coaxial Feed for Cascaded Cylindrical Metasurfaces Lin, Chun-Wen Ziolkowski, Richard W. Grbic, Anthony Applied Physics Classical Physics Optics This paper characterizes a realistic feed for cylindrical metasurfaces, allowing it to be included in metasurface design. Specifically, it investigates a coaxial feed which is displaced from the center (off-center) of concentrically-cascaded cylindrical metasurfaces. Formulas are reported to quickly compute the multimodal S-matrix (scattering properties) of a displaced feed from that of the central feed. The theory is rigorously derived based on the addition theorem of Hankel functions for all azimuthal modes. Moreover, the resulting multimodal S-matrix is combined with the multimodal wave matrix theory used to model cylindrical metasurfaces, allowing devices to be designed that realize arbitrary field transformations from a displaced coaxial feed. A design example is reported, which opens new opportunities in the realization of realistic, high-performance cylindrical-metasurface-based devices. |
| title | Characterization of a Displaced Coaxial Feed for Cascaded Cylindrical Metasurfaces |
| topic | Applied Physics Classical Physics Optics |
| url | https://arxiv.org/abs/2408.03949 |