Successive approximation method for the linear system of double longitudinal slots in a rectangular waveguide

An efficient approximation method is used to calculate energetic parameters and amplitude-phase distribution along a linear waveguide-slot antenna with double longitudinal slots in a broad wall of a rectangular waveguide having an arbitrary end loading. The approach is used when the E-field in slots is approximated with only one sinusoidal function. The mutual coupling of the slots over a waveguide and free space is taken into account, as well as the thickness of a waveguide wall and dielectric filling of the slots.