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Ladder type elastic wave filter and antenna duplexer using the same
Ladder type elastic wave filter and antenna duplexer using the same
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机译:梯型弹性波滤波器和使用其的天线双工器
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摘要
In a ladder-type elastic wave filter, a resonance frequency of a second parallel resonator is higher than that of a series resonator and lower than an antiresonance frequency of a series resonator. With this configuration, an attenuation pole is formed by the second parallel resonator at a frequency region lower than an attenuation pole formed by the series resonator in a frequency region higher than the passband of the ladder-type elastic wave filter.
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