CBFm analysis of planar waveguide array with longitudinal slots

The characteristic basis function method is applied to analyze the radiation and scattering problems of waveguide array with longitudinal slots in the broad wall. By using the geometry characteristic of the waveguide slot array, the equivalent magnetic currents are modeled on the slot surfaces, and the characteristic basis functions are established on each slot separately. Compared with the existing method of moments solution which is used for analyzing the slot array, the new method can greatly reduce the number of unknowns, and the memory and computation costs in solving the matrix equation can be greatly saved. The numerical results show that only one characteristic basis function is needed to be constructed for each slot, and the number of unknowns is only the number of array elements. Accordingly, the proposed method can be used to analyze the large waveguide slot array more efficiently.