Abstract:Against the backdrop of the design of electronic devices tending towards lightweight, low-profile, and multi-target features, a novel near-field multi-focus beam synthesis approach is put forward based on a new two-dimensional tensor impedance surface. On this basis, a tensor impedance surface that radiates near-field multi-focus beams is designed to operate at 10 GHz with a thickness of merely 1.524 mm. This surface accomplishes the radiation of multi-focus beams in space and the free proportioning of dual-polarization components of the multi-focus beams, and the multi-target energy convergence efficiency can exceed 40% at a distance of 1.5 m. Its low-profile design, straightforward feed structure, and multi-target radiation characteristics endow it with excellent application prospects in lightweight electronic devices.