ELECTRICAL WAVE FILTERS EMPLOYING CRYSTALS 231 



57 58 59 60 61 62 63 64 65 66 67 

 FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 7 — Insertion loss characteristic of a single section band pass filter 

 emplojang two crystals in each arm. 



— ^M/— i^^ww— v\A — 



->^;^Wv VW- 



Fig. 8 — Equivalences between lattice networks. 



