1D Slotted Waveguide Antenna with Controlled Beamwidth and Sidelobe Level Ratio

Slotted waveguide antennas (SWAs) are widely used in high power microwave applications. In this paper, the slots displacements in broadwall SWAs, previously used to control the SWA sidelobe level ratio (SLR), are further investigated to also adjust the beamwidth of the SWA. A modified Taylor array design method is used to estimate the excitations of the SWA slots leading to independently controllable SLR and first-null beamwidth (FNBW). The slots displacements are then calculated from these excitations. An example is presented where the SWA has 7 slots and the proposed method is employed to find the displacements required for desired SLR and FNBW.