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Piezoelectric resonators including mass loading to attenuate spurious modes

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专利汇可以提供Piezoelectric resonators including mass loading to attenuate spurious modes专利检索,专利查询,专利分析的服务。并且A piezoelectric resonator, formed of a plate of quartz having two major surfaces and an adjoining edge therearound, includes at least one electrode plated on each major surface with an electrically conducting connecting tab plated on the surface so as to extend from the electrode to the outer edge. The resonator portion under the connecting tabs is mass loaded by pseudo tabs plated on the opposite major surface so that spurious modes are propagated from the electrodes outwardly to the edge. The pseudo tabs are spaced from the electrodes a distance sufficient to allow propagation of the spurious modes while decoupling substantial propagation of the main mode into the tab area.,下面是Piezoelectric resonators including mass loading to attenuate spurious modes专利的具体信息内容。

1. A piezoelectric resonator with attenuated spurious response comprising: a. a piezoelectric crystal plate having two major surfaces and a surrounding edge; b. an electrode fixedly positioned in overlying relationship on each of said major surfaces, said electrodes being approximately coextensive and directly opposite and providing a main frequency mode of operation and spurious modes upon proper energization thereof; c. an electrically conducting tab fixedly positioned in overlying relationship on each of said major surfaces and extending from electrical connection with said electrode on each respective major surface outwardly to the surrounding edge of the major surface, said conducting tabs extending outwardly to the surrounding edge in different directions so substantially no portions thereof are directly opposite each other; d. a pseudo tabe positioned in overlying relationship on each of said major surfaces approximately coextensive with and directly opposite each of said conducting tabs, said pseudo tabs being spaced from said electrodes a distance sufficient to allow propagation of the spurious modes between said conducting tabs and said pseudo tabs toward the outer edge of said plate while decoupling substantial propagation of the main mode.
2. A piezoelectric resonator as claimed in claim 1 wherein the electrodes, conducting tabs and pseudo tabs all include material plated on the major surfaces of the piezoelectric crystal plate.
3. A piezoelectric resonator as claimed in claim 2 wherein the electrodes, conducting tabs and pseudo tabs all have approximately equal thicknesses.
4. A piezoelectric resonator as claimed in claim 3 wherein the electrodes and conducting tabs each overlie approximately the same amount of area of the major surfaces.
5. A piezoelectric resonator as claimed in claim 1 wherein the resonator includes two spaced apart electrodes on each major surface with a conducting tab extending outwardly to the edge from each electrode and a pseudo tab directly opposite each conducting tab.
6. A piezoelectric resonator as claimed in claim 5 wherein the two electrodes are positioned to lie on a line extending parallel to the X crystallographic axis.
7. A piezoelectric resonator as claimed in claim 5 wherein the spacing between the electrodes on each major surface is less than the spacing between the pseudo tAbs and the electrodes.
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