TR.IXSMISSIOX Cll.lh'.ICI I'.KlSriCS or W.M'EVILTERS 570 



Journal, Jan., 1!)2.3, pages '•V^^ to 41, anti contain llu- critical frc(|ui'n- 

 cics and frctiuoncies of niaxinuini attenuation. Subscripts j. and „ 

 will Ik- used to denote the "constant /f'and .U-typc t'and I \ .iri,il)l<s. 

 Ihe "constant k" formulae for the four classes follow. 



Lmv Pass. 



Hi'-h Pass. 



"—(/;): 



■■-'Q- 



t'.--(^')'/(i+d'). 



"*-■' /./: 



Band Pass. 



Uk=- 





* (/=-/.)^L(i+rf^)/- /Jj- 



(21) 



an.l ^ (22) 



Low-and-Iligh Pass. 



and (23) 



(/2 



and (24) 



At the mid-frequency, -\//i/2. the point of conflucncy ol two hands 

 in the transmitting band of this wa\e-filter, we obtain a[)pr()Nitn,itel\- 

 from (19), when d is small, 



.4=2</y7Z^ 



and (25) 



B = 0. 



