Transmitarray antenna design using slot-type element

Many transmitarray antennas are designed with multilayer frequency selective surface type elements. The goal of this paper is to present a multiple conductor layers transmitarray antenna using slot-type element with no substrate material. A quaternary-layer transmitarray antenna using cross-slot elements has been designed, fabricated, and tested for 11.3 GHz operating frequency. The measured gain of the prototype transmitarray is 22.06 dB. It is observed that the oblique incident associated with the excitation and the polarization direction has a strong effect on the antenna radiation pattern and gain.