Design and Waveguide Measurement of 2-Bit Reconfigurable Amplification Metasurface Cell
Xin Wang, Dexiao Xia, Guanxuan Li, Xiangjin Ma, Peng Xu, Jiaqi Han, Haixia Liu, Long Li
Abstract
This letter presents a novel 2-bit amplification metasurface cell (APMC) for nonreciprocal reflection of linearly polarized EM waves into high-intensity orthogonal waves. The 2-bit APMC consists of four parts, a reconfigurable receiving patch, a reconfigurable phase shifter, a power amplifier circuit, and a reradiating patch. By tuning the bias voltage of the p-i-n diodes mounted on the receiving patch and the phase shifter, the APMC could manipulate reflected waves with four discrete phase states. A power amplifier is placed between the receiving patch and the phase shifter to increase the energy intensity of the reflected wave. In addition, an orthomode transducer waveguide is designed and fabricated for measurement of the performance of the 2-bit APMC. From the measurement results, the maximum phase variation of the APMC is less than 25.5°, and the saturation reflected power is 27 dBm, indicating good phase stability and high energy transfer capability. The proposed APMC could be used as a metasurface unit cell to provide arbitrary microwave beams for wireless power transmission.