Controllable-sidelobe slotted waveguide antennas with corrugations for frequency selectivity

A simple method for the design of rectangular slotted waveguide antennas (SWAs) with specified sidelobe levels is briefly described, and is used to design an example SWA with 7 broadwall elliptical slots and sidelobes lower than -20 dB. A special corrugation geometry is then added to the SWA, where the uniform height of the corrugations controls the SWA´s operation frequency. This height can be changed by either pushing the corrugations through the non-slotted broadwall, or by implementing them on a conducting thin plate that can be replaced as needed, leading to some form of mechanical frequency reconfigurability.