Wideband High-Efficiency Transmitarray Antenna Using Compact Double-Layer Dual-Linearly Polarized Elements

In this letter, we propose a wideband high-efficiency transmitarray antenna (TAA) consisted of compact double-layer dual-linearly polarized elements. By loading L-shaped branches and four vias, these elements achieve a low transmission loss and full phase shift in a wide frequency band. Then, an optimization method for calculating the wideband average element loss is introduced, which determines the element distribution on the transmitarray aperture. For verification, a TAA prototype consists of 400 elements is fabricated and measured. The peak gain and aperture efficiency measured at 12 GHz are 27.1 dBi and 52.5%, respectively. The measured 1 dB gain bandwidth is 20.4%, and the minimum aperture efficiency achieved across the 1 dB gain bandwidth is 33%. The results reveal that the proposed TAA exhibits the advantages of flat gain bandwidth, high aperture efficiency, low profile, and low cost, endowing it with the potential for conformal applications and the capability to reliably connect satellite links as a communication antenna.