Reduction of second-order beams in slotted waveguide arrays using baffles

In waveguide fed slot arrays, the periodicity of the slots cause unwanted grating lobes off the principal planes referred to as second-order beams. These lobes can be reduced by using baffles. The authors present an efficient method to calculate the radiation pattern of longitudinal slot arrays with baffles by reducing the three dimensional field problem to a two dimensional one via a Fourier-z transform