The effect of surface roughness of dielectric substrates on the propagation characteristics of microstrip transmission line is investigated. Different models are used to simulate the surface roughness of the dielectric substrate. The versatile semi-analytical numerical technique, method of lines, is used to compute the normalized phase velocity of a microstrip line as a function of frequency up to 200 GHz. The preliminary results show that the root mean square height of the rough surface affects the propagation phase velocity of the microstrip line more than the shape of the roughness itself. Moreover, significant effect of the surface roughness is observed when the dielectric surface roughness extends beneath the metallic strip.
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