A Dual-Polarized Phased-Array Antenna Based on Single Ridge Slotted Waveguide Array

A novel 1D dual-polarized phased-array antenna based on single ridge slotted waveguide array is presented in this letter. The antenna works at X-band, and it is comprised of sixteen alternately arranged broad-wall and ridge-wall slotted array. A series of slots with different parameters are inserted in the broad-wall or the ridge-wall of a single ridge waveguide. They can radiate horizontally polarized and vertically polarized electromagnetic wave respectively. Because single ridge waveguide is relatively small in size compared to rectangular waveguide at the same operating frequency, the spacing of array element is reduced and the scanning angle of array is greatly increased. Simulated results show that the maximum scan angle of the proposed antenna is 30°. Furthermore, with Taylor distribution used for weighting, its side lobe level is less than -27 dB in another dimension.