In view of various deformations of ridge waveguide devices in use

we conduct secondary programming by using the finite element PDE toolbox in the Matlab environment to obtain the transmission characteristics of the waveguide in displacement deformation and different deformations under stress.Numerical analysis results indicate that displacement deformation elongates the cutoff wavelength of the ridge waveguide and in the case of single-mode bandwidth

the increase is less than 2%

while greater effect on the ridge waveguide is produced by the deformations under stress in both sides with over 10% changes in its characteristics when the deformation reaches 10%

to which we should pay much attention in practice.