Title:
FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2019/235514
Kind Code:
A1
Abstract:
A filter circuit (10) constitutes a signal path (R1) connecting terminals (P1, P2), and has a pass-band. An additional circuit (20) is connected to a node (N1) positioned between a terminal (P1) on a signal path (R1) and a filter circuit (10), and to a node (N2) positioned between a terminal (P2) on the signal path (R1) and the filter circuit (10), and constitutes a signal path (R2) coupling the nodes (N1, N2). The additional circuit (20) includes, on the signal path (R2), a parallel circuit (23) in which resonator groups (21, 22) are connected in parallel, and capacity elements (5, 6) connected in series to the parallel circuit (23). The resonator group (21) comprises IDT electrodes (1, 2) arranged in parallel in an elastic wave propagation direction, and the resonator group (22) comprises IDT electrodes (3, 4) arranged in parallel in the elastic wave propagation direction. The additional circuit (20) generates a signal of an opposite phase with respect to a signal component of a frequency band of signals transmitted by the filter circuit (10) that is not included in the pass-band.
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Inventors:
NAKAMURA SHINICHI (JP)
Application Number:
PCT/JP2019/022301
Publication Date:
December 12, 2019
Filing Date:
June 05, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/72
Foreign References:
| US20180152191A1 | 2018-05-31 | |||
| JP2013247466A | 2013-12-09 | |||
| JP2016220263A | 2016-12-22 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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