278 



National Resources Planning Board 



^"fl(p)+ ^ ^ ^ 



■yVW 

 fi(p) 



fz^P) f3^P)+3xf 



f4^P>'' 



-| — vWV — I — vVW— 



< f3(p) V f5(p) 



^f2(p) ^f4(p) 



A mathematical method of systematically designing a circuit of predetermined 

 impedance has been developed in Bell Telephone Laboratories. The given 

 impedance, as a function of frequency, is expanded in a Stieltjes continued 

 fraction, whose -terms give the electrical constants of the desired network. 



Figure 86 



