| 摘要 |
PROBLEM TO BE SOLVED: To provide a polar SAW filter which improves frequency characteristics. SOLUTION: The polarized SAW filter has: a two-terminal-pair SAW resonator type filter circuit having at least one serial arm SAW resonator and at least one parallel arm SAW resonator; and a two-terminal-pair impedance circuit which is connected in parallel to the two-terminal-pair SAW resonator type filter circuit and has an impedance for forming an attenuation pole by equalizing the open impedance of the two-terminal-pair SAW resonator type filter circuit and the short-circuit impedance of the SAW filter. COPYRIGHT: (C)2004,JPO&NCIPI
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