Double-Layer Ku/K Dual-Band Orthogonally Polarized High-Efficiency Transmitarray Antenna

This paper presents a double-layer, dual-band, orthogonally polarized, highly efficient transmitarray antenna (TA) operated in the Ku/K band (14 GHz/20 GHz) for millimeter wave (MMW) wireless communication systems (WCS). The proposed TA consists of two types of multi-resonant dipoles with metal vias, operating in the Ku and K bands. The Ku and K elements are interlaced with each other independently to ensure dual-band orthogonally polarized operation. The proposed double-layer elements obtained a 360° phase shift range with transmission amplitude greater than -2 dB. They also achieved independent phase responses in both bands by two orthogonally arranged elements. The proposed TA has been designed, manufactured and measured. The measurement results, which are consistent with simulation results, indicate that maximum gains of 25.2 and 27.4 dBi corresponding to aperture efficiencies of 55% and 49% are obtained at 13.75 and 20 GHz, respectively. Moreover, 1-dB gain bandwidths of 10% and 6% are also achieved in the Ku and K frequency bands, respectively. Therefore, the proposed double-layer Ku/K dual-band TA with high efficiency and simple design is a good candidate for MMW WCS.