A Low-Profile High-Efficiency Transmitarray Antenna Reflecting Effective Phase Discontinuity With TE/TM Superimpose Analysis

In this study, we propose a high-efficiency, low-profile transmitarray (TA) antenna system and present an efficient design procedure by co-designing a multiport subarray antenna (MPSA) to perform as a feed source and the TA simultaneously. The proposed TA antenna supports dual slant polarization (SP). Furthermore, the concept of effective phase discontinuity (EPD) based on a mutual coupling coefficient is introduced for efficient TA design operation at short focal lengths to verify the effectiveness of the advanced unit cell (UC) arrangement with gain enhancement. A TE/TM superimposing method was applied to derive the UC response over the entire area of the aperture of the TA based on the response analysis of a rotated UC satisfying 90° rotational symmetry to TE/TM oblique incidence. The designed TA antenna exhibits a low profile of F/D ratio = 0.33 at a center frequency of 3.5 GHz and a high aperture efficiency (AE) of 37%. The measured results are also in good agreement with the simulation results, indicating that the proposed TA antenna system provides an effective design methodology for SP array antennas and low-profile high-gain systems.