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Synthesis of high-stability 4th-order single-sideband crystal lattice filters

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1 Author(s)
Stevenson, J.K. ; Polytechnic of the South Bank, Department of Electrical & Electronic Engineering, London, UK

A lowpass antimetric ladder network is transformed into a single-lattice single-sideband crystal filter using simple network equivalences and an asymmetrical frequency transformation. A methodis then given for altering the phase shift independent of both the attenuation and network configuration, and applied so that a crystal in each lattice arm resonates at the frequency of infinite attenuation. Transferring these crystals to outside the lattice results in single-sideband filters of high stability. A frequency transformation involving two attenuation poles is given in an Appendix.

Published in:

Electrical Engineers, Proceedings of the Institution of  (Volume:121 ,  Issue: 10 )