ELECTRICAL WAVE FILTERS EMPLOYING CRYSTALS 243 



Co 



+C|4+2C,3 



T 



2,4 



C,-, + 2C, 



1 



2,3 



Fig. 20 — Unbalanced divided plate crystal connections and 

 their equivalent electrical circuits. 







^'^A = Ca+C,3| + Ci42=L 





Fig. 21 — Unbalanced band pass filter employing the connections of Fig. 20. 



[zizjy 



2,4 

 A 



Fig. 22 — Method for reducing stray capacitances in unbalanced filter connections. 



