The implementation of multifunctional metasurfaces through loading diodes has extremely high costs, while increasing the number of channels in the element through polarization multiplexing technology is limited. This paper proposes a dual-band five-channel (DBFC) 1-bit surface, which expands the polarization independent (PD) channels through rotating array. The polarization-independent metasurface element consists of three layers of metal, with the top layer comprising three rectangular patches oriented in the x-direction, the middle layer featuring a Jerusalem cross structure with accompanying resonators, and the bottom layer being a metal ground plane. The middle layer element can easily independently provide the required 1-bit reflection phases for two orthogonal polarizations in every frequency. The rectangular patches in the x-direction on the top layer do not contribute to the phase of y-polarization. By rotating the upper layer dielectric array 90°, the rectangular patches change to the y-direction. Under y-polarized illumination, the current distribution in the middle layer is shielded, providing a fifth set of polarization independent phases. The proposed 1-bit DBFC metasurface array has advantages in terms of structure and cost, while enhancing the utilization rate of the metasurface array. It has high application potential in microwave imaging, wireless power transmission, and other projects.
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