Design of a linear array of transverse slots without cross-polarization to any directions on a hollow rectangular waveguide

In this paper, we propose a linear array of transverse slots spaced with the half guided wavelength, which are fed by two hollow rectangular waveguides. No cross-polarization is radiated in any directions. The reflection is suppressed to below -14 dB in a wide frequency range and almost uniform illumination of all the slots is achieved in an eight-element array designed at 125 GHz.