| 摘要 |
PROBLEM TO BE SOLVED: To provide a polar SAW filter which can turn the frequency characteristics of the SAW filter highly efficient, forming an attenuation pole using an attached impedance. SOLUTION: The polar SAW filter is configured by a resonator SAW filter, using a SAW resonator of two-terminal pair circuit, and a serial connection of impedance of two-terminal pair circuit, forms an attenuation pole with impedance of the two-terminal pair circuit, and has steep frequency characteristics, and uses an inductor L<SB>40</SB>and an capacitor C<SB>40</SB>for an impedance Z<SB>4AP</SB>of the two-terminal pair circuit. COPYRIGHT: (C)2006,JPO&NCIPI
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