Transmission-reflection phase modulation for antenna gain enhancement and RCS reduction based on...

The manipulation of electromagnetic waves using metamaterials (MMs) has been extensively studied, yet research on simultaneously controlling both radiated and scattered electromagnetic waves within the same wideband remains limited. Building on previous work, this paper introduces transmission and reflection phase units based on polarization-selective metamaterials to regulate the radiation performance of a single-polarized source and the platform's scattering characteristics in a broadband range. The polarization-selective metamaterial consists of polarization-conversion transmission structures and polarization-selective reflection structures. Through phase design of these components, polarization-selective wavefront converter and chessboard metasurfaces were developed and fabricated. When integrated with the antenna platform, simulations and experimental results demonstrate an average radiation gain improvement of 7.3 dBi in the 8-12 GHz frequency range. Simultaneously, the monostatic radar cross section (RCS) reduction exceeds 10 dB on average within the same frequency range, and the bistatic RCS reduction averages over 10 dB for incident angles between 0° and 50°. In summary, this study presents an approach for the simultaneous control of both radiation and scattering performance over a broad frequency range.