Ultrathin multimode quartz crystal filter element
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United States of America Patent
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Apr 26, 1994
Grant Date -
N/A
app pub date -
Jan 24, 1992
filing date -
May 25, 1990
priority date (Note) -
Expired
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Abstract
Since split electrodes are disposed along the x-axis of an AT cut quartz crystal plate on its ultrathin vibratory portion formed integrally with a thick frame-like marginal portion surrounding it, desired acoustic coupling can be obtained although the split electrodes are disposed closely to such an extent as not to cause shorting between them. It is therefore possible to obtain, with a satisfactory yield, filter elements which have center frequencies in the range greater than about ten megahertz and sufficiently wide passbands.
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