Incorporated Design of Low Side-lobe Antenna with Inclined Slots in the Narrow Wall of Rectangular Waveguide Mounted With Radome

The paper presents an incorporated design of slotted waveguide antenna mounted with radome. Due to the geometric complexity of the slot cut in the narrow wall of rectangular waveguide (WG) mounted with radome, it is a large work to strictly derive the admittance of the slot with coupling. A correct simulation module is developed that will yield the relatively accurate resonant conductance and length of the inclined angles. By use of this design method, an S-band array has been developed. The far-field test of the antenna beam pattern shows that the antenna achieves a horizontal side-lobe level of better than −30dB, and a low cross-polarization level of −45dB in the entire frequency band, indicating that the incorporated design method is very effective.