Ka-band Diffraction Radiation Antenna

New model of a diffraction radiation antenna intended for applications in the Ka-band is presented. The antenna has high efficiency in the frequency range of 22.9-45.8 GHz, and boasts a narrow main lobe of the radiation pattern with a width of less than 3.2°. It has been demonstrated that the antenna enables effective spatial-frequency selection of E-polarized signals within the incidence angle sector of ±82°. This property makes the presented antenna well-suited for utilization in passive imaging systems.