Resonator, filter, and duplexer
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United States of America Patent
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Apr 5, 2016
Grant Date -
Dec 11, 2014
app pub date -
May 29, 2014
filing date -
Jun 10, 2013
priority date (Note) -
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Abstract
A resonator includes: a first comb-shaped electrode including a first bus bar, first electrode fingers coupled to the first bus bar and extending in an extension direction, and first dummy electrode fingers coupled to the first bus bar; and a second comb-shaped electrode including a second bus bar, second electrode fingers coupled to the second bus bar, extending in the extension direction, and facing the first dummy electrode fingers through first gaps, and second dummy electrode fingers coupled to the second bus bar and facing the first electrode fingers through second gaps, wherein 0.5λ≦ΔD where ΔD represents a distance in the extension direction between at least two gaps that are at least adjoining two of the first gaps or/and at least adjoining two of the second gaps, and λ represents pitches of the first electrode finger and the second electrode finger.
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