. The Bell System technical journal . r V^ 1 l V\A ^ (b) Fig. 5—Lattice network equivalences. Reference 1, page RESISTANCE COMPENSATED BAND-PASS CRYSTAL FILTERS 427 possible to take these resistances outside the lattice and combine themwith the terminating impedance, leaving all the elements inside thelattice dissipationless. The two remaining arms of the lattice have theimpedance characteristic shown on Fig. 6A. A lattice filter has a passband when the two impedance arms have opposite signs and an at-tenuation band when they have the same sign. When the impedanceof two arms cross, an in
. The Bell System technical journal . r V^ 1 l V\A ^ (b) Fig. 5—Lattice network equivalences. Reference 1, page RESISTANCE COMPENSATED BAND-PASS CRYSTAL FILTERS 427 possible to take these resistances outside the lattice and combine themwith the terminating impedance, leaving all the elements inside thelattice dissipationless. The two remaining arms of the lattice have theimpedance characteristic shown on Fig. 6A. A lattice filter has a passband when the two impedance arms have opposite signs and an at-tenuation band when they have the same sign. When the impedanceof two arms cross, an infinite attenuation exists. Hence the character-istic obtainable with this network is that shown on Fig. 6B. Next let us consider an electrical filter in which coils and condenserstake the place of the essentially dissipationless crystal. In this case thedissipation due to Li and L2 can be balanced as before and the onlyquestion to consider is the effect of the dissipation associated with L3and C3. In a similar manner to that employed for the coil we can show
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