EXPONENTIAL TRANSMISSION LINE 573 



the steady state condition is composed. At each point an exponential 

 Hne has two characteristic impedances which are different and depend 

 upon the frequency as well as the position along the line. 



Because of the change of impedance level, the propagation constants 

 for the voltage and current differ, so that it is convenient to consider 

 the transfer constant ^ which may be defined as half the sum of the 

 voltage and current propagation constants. 



* Compare with the definition of "image transfer constant" as given by K. S. 

 Johnson in "Transmission Circuits for Telephone Communication." 



