Chiral Dielectric Metasurfaces for Highly Integrated, Broadband Circularly Polarized Antenna

We report on the design of a low-profile integrated millimeter-wave antenna for efficient and broadband circularly polarized electromagnetic radiation. The designed antenna comprises a chiral dielectric metasurface built with a 2 x 2 arrangement of dielectric cylinders with slanted-slots at the center. A broadbeam high-gain with wide axial ratio (AR) < 3 dB bandwidth was reached by pairing the electric and magnetic resonances of the dielectric cylinders and the slanted slots when excited by an elliptically polarized driven-patch antenna. This electric-magnetic pairing can be tuned by varying the cylinders diameter and the tilting and rotation angles of the slanted slots. The simulation results indicate impedance-matching bandwidths up to 22.6% (25.3-31.6 GHz) with 3-dB AR bandwidths of 11.6% (26.9-30.2 GHz), which in terms of compactness (0.95 lambda(0) x 0.95 lambda(0)) and performance are superior to previous antenna designs. Since the simulations were performed by assuming materials and geometries easily implementable experimentally, it is hoped that circularly polarized antennas based on chiral metasurfaces can be integrated into 5G and satellite communications.

Automated summary

The design of a low-profile integrated millimeter-wave antenna for efficient and broadband circularly polarized electromagnetic radiation is reported. The antenna uses a chiral dielectric metasurface to achieve high-gain and wide axial ratio bandwidth, which outperforms previous designs in terms of compactness and performance. Simulation results show promise for integrating circularly polarized antennas based on chiral metasurfaces into 5G and satellite communications.