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Tuning fork filter design for hand scribe tuning

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3 Author(s)
G. Tsuzuki ; Supercond. Technol., Santa Barbara, CA, USA ; M. P. Hernandez ; B. A. Willemsen

This paper proposes a design technique for high-performance planar filters. The technique provides tuning elements that enable filter tuning by hand scribing, and a parameter extraction based technique to determine what should be scribed. Each resonator has a tuning element, the tuning fork that provides shunt capacitance to ground and is coupled to the resonator by means of a series capacitor. The resonator is tuned by physically disconnecting part of the shunt capacitor. The series capacitor reduces the tuning sensitivity to approximately 10% of what would be seen if the tuning fork was directly connected to the resonator. This reduced sensitivity enables tuning by hand, e.g. with a diamond scribe. A parameter extraction based technique was developed to diagnose the filter couplings and resonant frequencies, and to provide a recipe for scribing the tuning forks. As an example a 10-pole high temperature superconducting filter was designed, fabricated, and scribed. The predicted and measured results agree very well for this filter.

Published in:

IEEE MTT-S International Microwave Symposium Digest, 2005.

Date of Conference:

12-17 June 2005