RESISTANCE COMPENSATED BAND-PASS CRYSTAL FILTERS 431 



plating on such crystals. It is the purpose of this section to list a 

 number of filters of the unbalanced type which are equivalent to the 

 lattice filters of Fig. 8. They do not have as general filter character- 



La 



2 



2Q, 



C3 Qi 



-^w^ 



K 



_Vu^ 



-^r^Ry^ 



2[z=l ±l2C2 



(a) 



-^w^ 



20| 



HOh 



^u^^^- 



'C| 



'C| 



Jl2 

 2 



(b) 



0,4= 5^L, 02 



Fig. 9 — Wide-band bridge T crystal filters. 



istics as the equivalent lattice networks but for a number of purposes 

 are satisfactory. 



Fig. 9 shows four bridge T crystal filters which are equivalent re- 



