96 /*/:/./. Sy.STILM TFA'HMCAI. JOIRXAL 



Band pass 

 3-1, 1-1. ■^-^^. \-\. 1-5, .'.-I, 3-7. 3-."), S-4. 4-S, .")-4, 

 5 — 5, and 7 — 3. 



Sections rorrcsponclint; lo llie eciuhalent series-sluint prototypes 

 listed will lia\e the same impedance and propagation characteristics 

 as the protoi\pe, and ma\' be used indiscriminately in place of the 

 prototype, ("onseciuently, when a section has been reduced to any 

 of the above protot\pes, its various characteristics may be fouiui 

 from Table li and Figs. 7 and 8. 



As an example of structures which ha\e mutual inductance and 

 which arc equi\alent to structures listed above, consider the section 



I ^'^^ 2 

 0-' 0000 ^— Og-^UOT^^ 



. * T * 



o 1 o 



3 4 



I- in. M —Low r.iss lilicr .V-i lion t omainiiiK I'wo Coils, Having Mutii.il Iniluctcini-c 

 .Acting Between 'I'hem, and a Condenser Shunted Kroni Their Junction Point 



shown in Fig. 37. This section contains two coils ha\'ing mutual 

 inductance, and a condenser shunted from their junction point. The 

 three-terminal mesh forme<l b\' the two coils Z, 2 and L/2, together 

 with their series opposing mutual inductance ..1/, may be represented, 

 as in F'ig. 29B, by its e(iui\alent T mesh. The resulting equivalent 

 section is that shown in Fig. 38. The structure (jf Fig. 38, ha\Mng a 

 series reactance mesh corresi)onding to No. 1 of Fig. 5. and a shunt 



% -M ^ -t--M 



l-ig. .W— Killer Sci'tion (Dnt.iiniiin .No .Mulual iinlin i.inct-, iMiuiv.ilcnt lo tlic 

 Section of Kig. .57 



reactance mesh corresponding lo No. 3 of Fig. 5 is thai listed as 

 I —3 in Table II and in the above list. Consequently, it has propaga- 

 tif)n characteristic No. 2 of Fig. 7, and mid-series image impedance 

 characteristic No. 1 of Fig. 8. The section of I*"ig. 37 may, conse- 

 (|uently, Ik- joine<l at either end to any structure ha\-ing a mid-series 

 image im[)e<lancc characteristic such as that designated as character- 



