Highly Efficient and Ultra-wideband Polarization Converter for Millimeter-Wave Applications

This paper presents an ultra-wideband (UWB) polarization converting metasurface (PCMS) designed for the future generation of wireless communication to overcome the traditional issues of low operating band and efficiency. The simulation and calculated results show that the PCMS operates in the frequency band of 46.3–145.7 GHz, with UWB of 99.4 GHz, providing fractional bandwidth (FBW) of 103%, with polarization conversion ratio (PCR) > 90%. The achievement of UWB is due to the induced surface currents which help in generating multiple plasmon resonances and higher PCR. The PCMS and its mirror PCMS are used in a chessboard arrangement to reduce the radar cross section reduction (RCSR) based on phase cancellation. More than 10 dB RCSR is achieved in the frequency range of 46.6–142.7 GHz with 102% FBW. A prototype was fabricated and experimentally verified. The PCMS is compared with previous reported designs; it excels in terms of size, thickness, and operating frequency band. The design of PCMS has a simple structure and covers a wide variety of applications in the millimeter-wave (mmw) band, such as satellite communication, remote sensing, automotive radar, and medical applications.