Asymmetric dual‐band linear‐to‐circular converter by bi‐layered chiral metamaterial

Abstract

In this article, we present a dual‐band linear‐to‐circular transparent converter by bi‐layered chiral metamaterial (CMM) with an inverted “G” array in microwave region. The proposed metasurface consists of three layers which are the upper layer of the metasurface with a periodic regular metallic inverted “G” and wire array, the dielectric layer, and the bottom layer operating as chiral symmetric structure of the upper. The simulation results show that the transmitted right‐circular polarized wave with the axial ratio of 3 dB or less is in the range of 8.6‐10.9 GHz and the left‐circular polarized wave is within 18.1‐22.5 GHz when y‐polarized forward wave is normally incident. Specifically, the polarization conversion transmission can be maintained at over 85% at angle of incidence up to 40°. Therefore, the proposed CMM device is useful for the development of the integrated polarization manipulation devices.

A multiband circular polarization selective metasurface for microwave applications

“…of bands No. of layers Thickness (mm) 26 − 30.1 No 2 2 0.008 28 30.1 No 4 3 1.1 27 21.45 No 3 3 1.2 29 < 10 No 1 2 1.5 30 − 21.1 No 2 2 1.5 31 20.74 No 2 2 1.5 32 37.3 No 1 2 1.524 This work 47.16 Up to 45° 4 2 1.57 …”

“…Various techniques have been reported on the asymmetric linear-to-linear polarization area through the use of bi-layered 22,23 and multi-layered 24,25 chiral structures. Currently, scientific community has directed attention towards realizing asymmetric linear-to-circular polarization [26][27][28][29][30][31][32] . As it is a challenging task to achieve asymmetric linear-to-circular (CPS) like the ones in 27,28,32 , however, multi-layered structures can be deployed where multi-band or enhanced bandwidth is required.…”

“…The dual Vol:. ( 1234567890 www.nature.com/scientificreports/ band circular polarization selective metasurfaces using bi-layered structure has been demonstrated [29][30][31][32] . Zhang et al achieved circular polarization selectivity at two bands by using bi-layered inverted G-shaped structure 31 .…”

“…( 1234567890 www.nature.com/scientificreports/ band circular polarization selective metasurfaces using bi-layered structure has been demonstrated [29][30][31][32] . Zhang et al achieved circular polarization selectivity at two bands by using bi-layered inverted G-shaped structure 31 . Khan et al proposed a highly efficient chiral metasurface 32 in which CPS operation has been achieved only at the resonance frequency of 14.79 GHz with transmission magnitude of − 4.5 dB, however, the design worked only for normal incidence.…”

Performance Study of Broadband and a Dual-Band Antenna- Array of Telecommunication Systems

“…A compact three-element radiating structure with right-handed circular polarization (RHCP) has been proposed to link a low-power wide area network to space, taking advantage of the IoT. When considering FR-4 as a substrate for the antenna circuit and feeder network based on a quasi lumped quadrature coupler, the antenna had a radiation efficiency of 69% and a gain of 3.14 dBi [20]. For IoT applications has been proposed…”