Accession Number : ADD011496
Title : Normal Coordinate Monolithic Crystal Filter.
Descriptive Note : Patent Application,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC
Personal Author(s) : Ballato,A
Report Date : 11 Jan 1984
Pagination or Media Count : 13
Abstract : The foregoing and other objects of the invention are provided by the method and means for reducing the undesired mode couplings, improper phase and insertion loss responses as well as compensating for stress and transient temperature effects on the SC cut of quartz, for example, by aligning the electrode length, including the sides thereof, fabricated on the surfaces of the crystal plate along the direction of projection of the eigenvector (the normal coordinate), and, in the case of trapped energy monolithic filter, arranging the electrode gap so that the gap is perpendicular to the eigenvector projection. For the SC cut of quartz operating in the shear mode (c-mode) the projection angle of the eigenvector as well as the direction of the electrodes is at an angle of approximately 8.2 degrees from the X' axis of the doubly rotated cut.
Descriptors : *Patent applications, *Crystal filters, *Piezoelectric crystals, *Monolithic structures(Electronics), Couplings, Reduction, Phase, Losses, Insertion loss, Stresses, Transients, Thermal properties, Quartz, Electrodes, Length, Alignment, Orientation(Direction), Eigenvectors, Inventions
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE