A Polarization‐Insensitive Dual‐Frequency Rectifying Metasurface

ABSTRACT This article presents a polarization‐insensitive dual‐frequency integrated rectifying metasurface for radio frequency energy harvesting. The metasurface incorporates two uniquely designed circular rings to achieve resonance at 2.45 and 5.8 GHz, respectively. Strategic gaps within the unit cell structure accommodate rectifying diodes and inductive components, facilitating alternating current signal rectification and direct current path construction. This integrated design eliminates the need for complex impedance matching networks while enabling efficient capture of electromagnetic waves at two frequency band across broad incidence and polarization angles. Additionally, its via‐free feature significantly simplifies the fabrication process. Experimental results demonstrate peak conversion efficiencies of approximately 56% at 2.45 GHz and 55.6% at 5.8 GHz under incident power densities of 331 and 295 mW/m², respectively. The proposed design exhibits significant advantages, including compact size, fabrication‐friendly, polarization insensitivity, and wide‐angle incidence tolerance.