DIELECTRIC-COATED WAVEGUIDE 



1259 



0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 



COAT THICKNESS IN PER CENT OF THE RADIUS 



Fig. 2(b) — Change in phase constant of the TMn wave in the dielectric-coated 

 waveguide, e = 2.5; a/X = 2.06. 



0.4 0.8 1.2 1.6 2.0 



COAT THICKNESS IN PER CENT OF THE RADIUS 



Fig. 2(c) — Change in phase constant of the TJNIn wave in the dielectric-coated 

 waveguide. « = 2.5; a/X = 4.70. 



