An X-band bifunctional antenna using anisotropic transparent meta-surface

An integration of a transmitarray antenna and a beam-steering antenna has been achieved and experimentally demonstrated. The antenna system operating at X-band (8–12 GHz) is implemented by a well-optimized transparent meta-surface and launched by polarization-controlled feed antennas. The transparent meta-surface, with polarization-independent property, consists of 12 × 12 elements with a parabolic phase distribution at y-direction and a linear phase gradient at x = direction, respectively. Illuminating the meta-surface with differently-polarized electromagnetic waves, anomalous phenomena of beam bending and focusing are clearly observed. The performances of the antenna system are investigated in depth through near-field analysis and far-field measurements. Numerical and experimental results coincide well, indicating that the proposed antenna system advances in many aspects such as bifuncional radiation patterns, a broad bandwidth and also a simple fabrication process based on the convenient print circuit board (PCB) technology.