Ml II .11. I.XIHil.l.Ml l.\ ((•/// III IIKs 



07 



isiic No. 1 i>f I'ig. S. The srction of I'ig. M is imt capable of niifl- 

 shunt termination since point (J of I'ly^. 38 is not pin sically accessible. 

 Similarly, the section shown in l-ij;. 39 is e<iuivalent to the series- 

 shunt structure of I-'iR. -JO. If the transformer mesh in Fig. 39, 

 formed by 2Ln, M and "iZ-s Ik- replaced by its e<iui\alent t mesh, — 

 assuming series opposing windings the structure of Fig. 40 results. 



-M- 



J_2L, 2L^J_ 



X 



I 



Fig. it — Band Pass Kilter Swlion 

 Containing Muliial Indiictancx- 



Fig. 4() — Filter Section, Containing No 



Mutual Inductance, Kquivalcnt to the 



Section of Fig. 39 



This structure is listed as band pass section 1-4 in Table II and has 

 propagation characteristic No. 7 of Fig. 7, and mid-shunt image im- 

 IK'dance characteristic No. 14 of Fig. 8. Consequently, the section 

 of F'ig. 39 may be joined efficiently to any fdter section of Table II 

 having the mid-shunt image impedance characteristic No. 14 of 

 Fig. 8 or to any section containing mutual inductance and having 

 the same mid-shunt image impedance characteristic. The section 

 of Fig. 39 is not capable of mid-series termination, since point 5 of 

 inductive element 1—3 of Fig. 40 is not physically accessible. 



3 I A^'^"^ 3 



^ < WggNI-HKgg W 



4 2 



l-ii;. 41 -K.\.iiTii)lfs ol lilur .ScrlioTis ( oiit.iiiiliiK .Miitu.il liiclurt.iiic 



Three further e.xamples of the substitutions which have been dis- 

 cussed are represented in Figs. 41 A, B, and C. By means of sub- 

 stitutions these structures are evidently equivalent to series-shunt 

 sections 4—1 (mid-shunt terminated), 4 — 4, (mid-shunt terminated), 

 and 3 — 7 (nud-series terminated), rcsjwctivcly, and they have the 

 characteristics detailed in Table II. The above examples represent 

 only a few of the many variant forms of structures which may be con- 

 structed by means of the various equivalences heretofore discussed. 



