Nonuniform distortionless transmission lines

Heavside's classical condition for distortionless signalling, g/c = r/l, is generalized to nonuniform transmission lines. The resulting class of nonun iform lines possesses several interesting properties, which are investigate d in some detail. For instance, there exists a preferred direction for dist ortionless signalling, a phenomenon not observed with uniform lines. We als o show that closed-form solutions to quite general wave propagation problem s can be derived directly in the time domain.