Improved slotted waveguide antenna with optimized corrugations and suppressed sidelobes for high-power applications

Summary form only given. In this work, an S-band slotted waveguide antenna (SWA) with optimized corrugations is presented. It is based on 10 identical longitudinal elliptical slots cut in one of the broadwalls of a WR-284 waveguide (a = 2.84", b = 1.37"). The waveguide is shorted at one end and fed from the other, leading to a resonating SWA. Elliptical slots, which have no sharp corners, are known to be more suitable for high power applications. The SWA is initially designed for operation at 3 GHz, where the guide wavelength λ_g = 138.5 mm. The slots are spaced at λ_g=2, center to center. Their length (double the ellipse\´s major radius) and width (two times the minor radius) are determined, and their displacements from the broadface center-line are optimized to suppress the sidelobes to below -25 dB. The total length of the waveguide is 5λ_g.