Abstract
AbstractA cross polarization conversion (CPC) structure using metasurface over wide bandwidth has been presented for practical applications in this article. The unit cell of the proposed metasurface is made of metallic patch of single circular split‐ring imprinted on top surface of a metal‐backed single‐layer dielectric substrate. Full width at half maxima bandwidth of polarization conversion ratio (PCR) of 11.12 GHz is realized along with wide bandwidth of 9.92 GHz extending from 6.06 GHz to 15.98 GHz with more than 0.8 PCR magnitude is realized using suitable optimization of the geometrical dimensions. Four distinct PCR peaks are observed at 6.56 GHz, 10.38 GHz, 15.12 GHz, and 16.68 GHz. The polarization conversion phenomena at these four frequencies have been analyzed in the light of electromagnetic resonances. The roles of several geometrical parameters of the design are simultaneously investigated. The proposed structure has been studied under oblique incidence, both for transverse electric and transverse magnetic polarizations. Wideband polarization conversion characteristics up to 45° incident angles have been observed for both cases. A prototype of the proposed metasurface is fabricated, and experimental results are in good agreement with the simulated responses. The proposed structure is ultrathin; ~λ/11.8 with respect to the center frequency of the CPC bandwidth.
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