A Conformal Transmissive Metasurface with Dual-Band Dual-Circularly Polarized Conversion and Low Scattering

Generally, the existing metasurfaces are periodically or non-periodically planar micro-structures, which hardly satisfy the practical applications such as stealth aircraft, carrier and so on. In order to meet the application, a conformal transmissive metasurface are proposed with multi-function of converting linear polarization into dual-circular polarization in dual-band and low scattering for incidences. The metasurface composed of a non-metallic dielectric material of polyvinyl chloride and the ultra-thin conventional material to achieve a flexible configuration. The mechanism is illustrated by the characteristic parameters, electric field distributions, and equivalent circuit. The simulated results demonstrate that the metasurface can transform y-polarized waves into right-handed circularly polarized waves in 6.8–10.3 GHz and to left-handed circularly polarized waves in 18.77–21.15 GHz, while vice versa for x-polarized waves. Additionally, the conformal metasurface shows an excellent scattering section reduction in operational frequency and that above 10 dB can be realized as the frequency increases. A conformal metasurface sample is fabricated by the printed circuit board (PCB) and 3D printing technology, which is measured in a microwave anechoic chamber that conforms to the simulated results. The conformal transmission metasurface holds significant promise for applications in radomes and electromagnetic shielding.