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The Synthesis of Narrow-Band Crystal Band-Elimination Filters

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1 Author(s)

A new design theory is developed for the insertionloss synthesis of narrow-band crystal band-elimination filters. The theory is based on the narrow-band approximation and consequent pseudoreactance theory originally suggested by Baum and extensively used for narrow-band bandpass filter design. The structure used is a tandem connection of bridged- T sections, able to accomodate arbitrary crystal capacitance ratios and, through the use of a transformer, arbitrary crystal inductances. An additional free parameter can be used to reduce the spread of element values. An example illustrates the excellent agreement between approximate theory and exact final analysis.

Published in:

IEEE Transactions on Circuit Theory  (Volume:15 ,  Issue: 4 )