Low-Profile Dual-Band Dual-Polarized Transmitarray Antenna Based on Multilayer Frequency Selective Surfaces

Abstract

In this work, a new dual-band dual-polarized transmitarray antenna element based on multilayer frequency selective surfaces is introduced. This novel configuration has been successfully tested for K/Ka SatCom frequency bands and is composed of a single low-profile printed circuit board incorporating 5 metal layers without any vertical transitional elements. In contrast to existing solutions, this proposal eliminates the need for vertical interconnections, air gaps, or spacers between the metal layers, resulting in a cost-effective board with an overall thickness of 0.24λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> at 30 GHz. The proposed unit cell operates at 20 and 30 GHz exploiting an interleaved lattice configuration. It affords independent control of the transmitted field phase within a range of 300 degrees, at both frequency bands, while maintaining a transmission loss not exceeding 3.5 dB. To substantiate the proposed design, an 87×87mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> transmitarray has been prototyped and experimentally validated. The measured results indicate a peak gain of 20.6 and 22.8 dBi at 20 and 30 GHz, respectively. Furthermore, the -1dB gain bandwidth has been found to be 5% in the first band and 4.5% in the second band.