Abstract Based on practical requirements, this paper presents the design, fabrication, and experimental validation of a Ka-band wideband two-dimensional (2D) phased array antenna with 45° slant polarization. The array integrates a polarizer with 28 six-element metallic Vivaldi linear sub-arrays. To the best of the authors’ knowledge, no previous work has reported the engineering implementation of a polarizer-integrated 2D phased array at Ka-band, as existing studies are limited to single elements or one-dimensional arrays. Measured results show that the array achieves an active Voltage Standing Wave Ratio (VSWR) below 2.6 over 32–40 GHz, with a gain exceeding 25.5 dBi. It supports wide-angle scanning up to ±50° in the azimuth plane and ±30° in the elevation plane, with a scan loss not exceeding 3 dB across the entire scanning range. Furthermore, the amplitude difference between horizontal and vertical polarization components remains within 2.9 dB throughout the scanning range, confirming desirable slant polarization characteristics.
Feng et al. (2026) studied this question.