Abstract
This letter presents a bi-layered chiral metasurface to achieve angularly stable dual-broadband cross-polarization conversion and asymmetric transmission properties of electromagnetic waves with linear polarization. In this regard, any unit cell of the recommended chiral metasurface consists of two new h-shaped resonators configured on two opposite sides of a dielectric slab. Investigations of the simulated and experimental electromagnetic responses validate that the impinging x − (y−) and y − (x−) polarized waves can convert into transmitted y − (x−) and x − (−y) polarized waves at 7.5–8.6 GHz and 15–16.6 GHz, if the incident waves pass through the structure along −z (+z) direction, respectively. The obtained polarization conversion ratio (PCR) and asymmetric transmission parameters are more than 0.9 and 0.55 at both operated frequency bands, sequentially. Therefore, the proposed CMS has a significant potential to transform x- and y- polarized waves to orthogonal ones over the related frequency bands. The mechanism of the polarization conversions for any incident polarized wave has been verified by studying surface current distributions.
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