ELECTRICAL WAVE FILTERS EMPLOYING CRYSTALS 



237 



sentation shown on Fig. 14D can be used if we are interested only in 

 the transmission from one set of plates to the other. The numbering 

 on the terminals agrees with that shown on Fig. 14B and is necessary 

 in order that a given voltage E will produce the same displacement in 

 the crystal when the voltage is applied between 1 and 2 and 3 and 4. 



I TO <J)2 



E =FCo 



^im^ 



(A) 



• r - ° 



lyS22 



> Lki - 



CB) 



'•yj^Wjlt = LENGTH, WIDTHj THICKNESS 



1 TO 



^ C. 



co_L 



2 



^W^ — I 



Co. 

 2 



Cc] 



2 * 



1T0^^M_LM^i_T0, 



L^^^^nnr^ 



(0) 



Co 

 2 



4>2. <t)2. 



' TO ^ ; -^ T0 1 

 2 



2 — * 



C, 2L, ^ 



Cq Cq I 



2 2 



2L, 



2L, 



3 2 — i — oxxy^ 



(F) 



« 4 



J_^0 



* 3 



2L, 



crw- 



r-^M^ 



(H) 

 Fig. 14 — Equivalent networks to represent transmission through divided plate crystal. 



