Title:
FILTER CIRCUIT AND FILTER DEVICE
Document Type and Number:
Japanese Patent JP2020108066
Kind Code:
A
Abstract:
To configure a filter circuit ensuring a steepness from a pass band to an attenuation band while maintaining broadband pass characteristics, and a filter device including the same.SOLUTION: A filter circuit 101 has a first filter 1 and a second filter 2. The first filter 1 is a filter using an LC circuit that has a first frequency band as a pass band and an attenuation band in the first frequency band or below. The second filter 2 is a filter for attenuating at an attenuation pole due to resonance or anti-resonance of an elastic wave resonator in a second frequency band within the first frequency band. The first filter 1 is disposed closer to an antenna terminal ANT side than the second filter 2.SELECTED DRAWING: Figure 1
Inventors:
MATSUBARA YUTAKA
KATO MASANORI
KIDO SHUNSUKE
KATO MASANORI
KIDO SHUNSUKE
Application Number:
JP2018247109A
Publication Date:
July 09, 2020
Filing Date:
December 28, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO
International Classes:
H03H7/01; H03H7/075; H03H7/46; H03H9/64; H03H9/72
Attorney, Agent or Firm:
Kaede International Patent Office