GENERALIZKI) TKLKGRAPHIST's EQUATIONS 801 



Hxv is a pure imaginary, it effectively increases the transverse permeabil- 

 ity for one mode and dec^reases it for the other. 



To avaluate the effect of higher order TE and TM modes on wave 

 pro[)agation we may substitute from (68) in all terms of the character- 

 istic tMiuation for telegraphist's ecjuations except the first two diagonal 

 terms and recalculate the jS's. Alternatively we may replace TE[io] and 

 TE[on modes by the normal modes just obtained, recalculate the cou- 

 pling coefficients, and evahuite the effect of the mode with the greatest 

 coupling to the modes under consideration. 



