Radiation Pattern Reshaping of Aperture-Sharing Metasurface-Based Wide-Beam Rectenna

An aperture-sharing metasurface-based wide-beam rectenna with radiation pattern reshaping for decomposed high TMxy mode is proposed. The critical contribution of this aperture-sharing metasurface-based rectenna is to reuse unit cells on the MTS layer to excite three modes by three ports simultaneously, thereby achieving a wide beam width. But the radiation pattern of the modes excited by side feed ports, decomposed in high TMxy mode, is with the sidelobe, affecting this rectenna's energy harvesting ability. Hence, radiation pattern reshaping of decomposed high TMxy mode is studied in this paper. According to the working principle, two key factors, the size ratio between outer unit cells and inner unit cells and the size ratio between length and width of unit cells, are discovered that could affect the radiation pattern transformation of this high mode. The overall size of this proposed rectenna is λ₀ × λ₀ × 0.03 λ₀. Three excited modes operate at 2.45 GHz. By combining the direct current output from these three modes, this rectenna can achieve a beamwidth of 114° and a peak gain of 10.7 dBi.