and 



DISTORTION CORRECTION 469 



K = R + iLco; 



zii = iLiico, (48) 



221 = (2RL/Ln) + i{UILu)oi + \/i{LulR')o:. 



The impedance S21 is series resistance, inductance and capacity. 



2. 



X = i? + lA'Cco; 



211 = lACiico, (49) 



and 



22] = (IRCnlQ + i(i?--=Cii)co + lAXCVCiOco. 



(50) 



where i?2i = m2R{C - CnY/C^ 



L22 = m^R'CiiiC - CnY/C, 

 i?23 = R{miC' + m2Cu{2C - Cu))IC\ 

 and 



C24 = OJintiC + m2Cii). 



The impedance 211 consists of two parallel branches each containing 

 series resistance and capacity; 221 is made up of parallel resistance and 

 inductance in series with both resistance and capacity. For certain 

 values of the parameters mi, m^, and Cu, even though positive, the 

 resistance i?23 can become negative and hence unphysical as a passive 

 element. 



A lattice or equivalent network made up of such impedances, in 

 addition to having the assumed iterative impedance which approxi- 

 mates that of an open-wire line at the upper frequencies, can have an 

 attenuation constant decreasing with frequency which tends to equalize 

 that of a length of such line; the attenuation formula has the form 



