Dynamic Resistance Loading Technology-Based Metasurface Design With Co-Regulated Band-Notch Frequency of Radiation

For electromagnetic stealth against radar digital signal processing systems, real-time adjustable impedance of the platform is urgently needed under the guaranteed instantaneous tracking capability. In this study, a multifunctional metasurface (MMS) based on dynamic resistance loading (DRL) technology is proposed to dynamically modulate the scattering amplitude of a band-notch adjustable radiation array. Based on the theoretical analysis of the cooperation mechanism between the switchable band-notch and DRL frameworks, the lossy and lossless layers are separately designed to construct the MMS. A dual-linear polarized DRL absorber is generated by continuously transforming the forward voltage of the orthogonal p-i-n diodes on the lossy layer. Meanwhile, the reverse voltage changing of the varactor diode on the lossless layer results in an adjustable band-notch effect. After joint optimization between the 3-D dipole element and the MMS, an $8\times 4$ radiation-stealth metasurface (RSMS) is then fabricated and measured. With the changing voltage of p-i-n diodes, the wideband radar cross section (RCS) amplitude regulation of dual-linear polarization has been proven to be greater than 15 dB. For a specific capacitance of the varactor diodes, the beam scanning angle of the RSMS is up to 45° at 4.6 GHz. The RSMS has realized instantaneous frequency switching of radiation under the premise of wideband tunable scattering control. The proposed design method provides an effective stealth scheme for digital signal processing radar system.