Bandwidth comparison of rectangular and offset cross-slot FSS polarisation transformers

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This letter compares the 3 dB axial ratio bandwidth of transmission mode single screen linear to circular polarisation convertors based on three different slot topologies. Using a conventional centre connected cross-slot arrangement as a baseline, we show that a significant performance improvement can be achieved by creating a more elaborate design with unit cells composed of multiple unequal length offset rectangular shaped apertures. The additional flexibility to tailor the shape of the TE and TM spectral amplitude and phase responses is exploited to achieve a 84% increase in the bandwidth relative to the baseline, for a freestanding structure which is designed to work at a centre frequency of 10.0 GHz. Experimental axial ratio results are used to verify the new design methodology.
Original languageEnglish
JournalIET Electronic Letters
Early online date22 Mar 2021
Publication statusEarly online date - 22 Mar 2021

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