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.