ELECTRO ACOUSTIC RESONATOR WITH SUPPRESSED TRANSVERSAL GAP MODE EXCITATION AND REDUCED TRANSVERSAL MODES
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United States of America Patent
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Issued Date -
May 16, 2024
app pub date -
Nov 21, 2023
filing date -
Nov 21, 2023
priority date (Note) -
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Abstract
An electro acoustic resonator is provided. The resonator has a gap short structure (GSS) to electrically short at least an area of the transversal gap to suppress transversal gap mode excitations. The gap short structure may be provided by a conductive stripe in the gap and parallel to or inclined with respect to the bus bar (BB) shorting adjacent IDT fingers. Additional connectors between the stripe and the bus bar may be provided. The connectors may have different pitch or metallization ratio with respect to the ID fingers. The connectors may be offset from the position of the fingers and my be inclined with respect to the bus bars. Multiple parallel stripes in the gap may provide a transversal reflector. By using a gap short structure a further improved transversal mode suppression of piston mode designs can be achieved.
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