Title:
HIGH-FREQUENCY FILTER ELEMENT, MULTIPLEXER, TRANSMITTER, AND RECEIVER
Document Type and Number:
WIPO Patent Application WO/2017/159834
Kind Code:
A1
Abstract:
A transmission filter (11) is provided with a first filter part (11A) connected to a common terminal (30), the first filter part (11A) causing a high-frequency signal of a transmission band to pass through, and a second filter part (11B) connected between a transmission input terminal (10) and the first filter part (11A), the second filter part (11B) attenuating a high-frequency signal of a reception band. The second filter part (11B) has a series resonator (104) and a parallel resonator (153), the antiresonance frequency (fap3) of the parallel resonator (153) is located outside the transmission band, the resonance frequency (frs4) of the series resonator (104) is lower than the antiresonance frequency (fap3) of the parallel resonator (153), and the antiresonance frequency (fas4) of the series resonator (104) and the resonance frequency (frp3) of the parallel resonator (153) are located between the resonance frequency (frs4) of the series resonator (104) and the antiresonance frequency (fap3) of the parallel resonator (153).
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Inventors:
ARAKI MASATO (JP)
Application Number:
PCT/JP2017/010814
Publication Date:
September 21, 2017
Filing Date:
March 16, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H7/38; H03H7/46; H03H9/145; H03H9/58; H03H9/70; H03H9/72
Domestic Patent References:
| WO2013046892A1 | 2013-04-04 |
Foreign References:
| JPH07154200A | 1995-06-16 | |||
| JP2008301223A | 2008-12-11 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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