BOUNDARY PROBLEM SOLUTION FOR EIGENMODES IN COAXIAL QUAD RIDGED WAVEGUIDES
The boundary problem for eigenmodes in coaxial quad ridged waveguides has been solved by the transvers e fi ld matching technique. The formulas obtained provide possibilities o calculate cutoff wave numbers and electric and m agnetic fields distributions of TEM, TE and TM modes in the presence of the ridg es either on the inner or on the outer perfectly co nducting cylinder. The analysis of the dependences of cutoff wave numbers and electric field distributions convergences on th e number of partial modes has been carried out. It has been shown that for ca lculation of cutoff wave numbers with residual erro r less than 0.1 it is enough to utilize 27 partial modes, and for the correct ca lcul tion of fields distributions one should utiliz e more than 30 partial modes.