This research presents case studies of engineering applications, such as electromagnetic propagation in uniformly curved waveguides with rectangular cross-sections, operating at typical frequencies of 5G and 6G mobile network systems. In this work, we introduce the boundary value problem and address numerical techniques for solving the Maxwell s equations in curved waveguides, aiming for solutions to the associated eigenvalue problem. First, the Point Matching method is employed as an alternative to solve this type of problem by tracking zeros of the determinant of a matrix. Next, we use the Method of Moments to solve the same problem by computing surface integrals of functions over the rectangular geometry. Additionally, this method is employed because it deals with a linear eigenvalue problem, making it more practical than Point Matching. Finally, using a computational algorithm developed in Matlab, we present a series of results on the electromagnetic propagation of the curved rectangular waveguide in the H-plane and E-plane for different values of the curvature radius of the curved rectangular section. The numerical results demonstrate the convergence of the presented solution with respect to the exact solution using a small number of harmonics.