ELASTIC WAVE FILTER DEVICE AND ANTENNA DUPLEXER USING SAME
摘要
<p>The disclosed elastic wave filter device includes: a longitudinally-coupled-resonator-type elastic wave filter formed on a piezoelectric substrate; and a ladder-type elastic wave filter connected to the longitudinally-coupled-resonator-type elastic wave filter. The longitudinally-coupled-resonator-type elastic wave filter has an input IDT and an output IDT. The ladder-type elastic wave filter has a series-arm resonator and a parallel-arm resonator. A first ground electrode which is connected to the parallel-arm resonator is electrically separated from a second ground electrode which is connected to the input IDT and/or the output IDT.</p>
