Piezoelectric resonator with an attenuated spurious response
AssigneeMotorola, Inc.
InventorsCharles Zimnicki, Kevin Haas, Iyad Alhayek
Life of this patent
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Abstract
A piezoelectric resonator (10) with an attenuated spurious response. The resonator (10) includes a piezoelectric crystal plate (12) having opposite surfaces (14, 16), an electrode (18, 24) positioned and overlying relationship on each of the opposite surfaces (14, 16), the electrodes (18, 24) being substantially coextensive and opposite, and providing a primary frequency mode of operation and spurious modes upon suitable energization, and a number of mass loading structures (34) on at least one of the surfaces (14, 16) substantially surrounding at least one of the electrodes (18, 24).
Claims13
A piezoelectric resonator with an attenuated spurious frequency response, comprising:
- a piezoelectric crystal plate having opposite surfaces;
- an electrode positioned in overlying relationship on each of the opposite surfaces, the electrodes being substantially coextensive and opposite, defining an electroded area, and providing a primary frequency mode of operation and spurious frequency modes upon suitable energization;
- and
- a plurality of mass loading structures on at least one of the surfaces substantially surrounding at least one of the electrodes defining an unelectroded area, the unelectroded area and the electroded area having substantially similar masses per unit area.
A piezoelectric resonator with an attenuated spurious frequency response, comprising:
- a piezoelectric crystal plate having opposite surfaces;
- an electrode positioned in overlying relationship on each of the opposite surfaces, the electrodes being substantially coextensive and opposite defining an electroded area, and providing a primary frequency mode of operation and spurious frequency modes upon suitable energization;
- and
- a plurality of mass loading structures on both of the opposite surfaces substantially surrounding the electrodes defining an unelectroded area, the mass loading structures and the electrodes comprise substantially similar material and the unelectroded area and the electroded area have substantially similar masses per unit area.
Dependencies are inferred from the claim text.