Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1987-05-26
1989-06-13
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333189, 29 2535, 310312, 310366, H03H 956, H03H 913, H03H 9205
Patent
active
048396184
ABSTRACT:
A monolithic coupled-dual resonator crystal filter is produced for operation with wide bandwidths (especially at high center frequencies) by providing an ultra-small gap between juxtaposed resonator electrodes. A gap width of substantially less than 0.006 inch is obtained by laser-machine trimming the gap. An initial single electrode may thus be divided into a pair of such juxtaposed resonator electrodes. Further metallic plate-back is provided on the electrodes for center-frequency control. Although this typically may decrease the coupling bandwidth somewhat, an increased thickness of metallic plate-back material on the ground electrode, opposite the ultra-thin gap area on the active side of the crystal wafer, provides precisely controlled extra wide bandwidth.
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Musashino Electrical Communication Laboratory, N. T. T. Musachino, Japan 180 "High Performance Monolithic Crystal Filters with Stripe Electrodes", by Noboru Watanabe et al; (1975); pp. 333-340.
Roberts Gerald E.
Staples A. Gordon
Toliver Samuel
General Electric Company
Nussbaum Marvin L.
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