Title:
BAND PASS FILTER AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2019208154
Kind Code:
A
Abstract:
To provide a band-pass filter capable of preventing deterioration of attenuation due to temperature fluctuation without using materials expensive and difficult to process.SOLUTION: A bandpass filter 1 includes: a plurality of resonators 10, 20, 30, having a plurality of outer conductors 11, 12, 13 each having a cavity having open portions 13, 23 and a plurality of inner conductors 12, 22, 23 disposed respectively in the cavities of the plurality of outer conductors 11, 12, 13, and coupled at the open portions 13, 23, respectively; and an attenuation pole member 40 made by plating metal on a resin material having a linear expansion coefficient equal to or more than three times that of aluminum, disposed between the first inner conductor 12 in the first outer conductor 11 and a third inner conductor 32 in a third outer conductor 31 of the plurality of outer conductors 11, 12, 13 so as to pass through an opening portion 33 provided penetrating through the first outer conductor 11 and the third outer conductor 31.SELECTED DRAWING: Figure 1
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Inventors:
SUKEGAWA TAKESHI
Application Number:
JP2018103253A
Publication Date:
December 05, 2019
Filing Date:
May 30, 2018
Export Citation:
Assignee:
NEC CORP
International Classes:
H01P1/205; H01P1/30; H01P7/04; H01P11/00
Attorney, Agent or Firm:
Ken Ieiri