| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave (SAW) filter and communication device in which parasitic capacitance between wiring patterns can be reduced and a signal suppression level outside a passband can be increased. SOLUTION: A resin pattern 2 with a dielectric constant smaller than that of a piezoelectric substrate 100 and conductor patterns 31-46, 51-63 are respectively formed on the piezoelectric substrate 100. One-terminal coupled SAW resonators 11, 12 and longitudinal coupling resonator type SAW filters 13, 14 are respectively formed from the conductor patterns 31-46. A portion wherein the wiring patterns of the conductor patterns 58, 59 with different potentials and the wiring patterns of the conductor patterns 60, 61 are opposed to each other in a planar view, is formed on the resin pattern 2. COPYRIGHT: (C)2005,JPO&NCIPI
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