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US 11,081,767 B2Granted
Multilayered filter device
AssigneeTDK Corporation
InventorsYuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
Life of this patent
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Abstract
A multilayered filter device includes a multilayer stack, a band pass filter, a first band elimination filter, and a second band elimination filter. The band pass filter and the first and second band elimination filters are each constructed using the multilayer stack. The band pass filter includes a plurality of first resonators with open ends. Each band elimination filter includes a connection path, and a second resonator coupled to the connection path. The connection path includes an impedance transformer. The second resonator includes a conductor line constituting a distributed constant line.
Claims25
A multilayered filter device comprising:
- a multilayer stack including a plurality of dielectric layers and a plurality of conductor layers stacked together;
- a first input/output port and a second input/output port integrated with the multilayer stack;
- and
- a band pass filter and a band elimination filter each constructed using the multilayer stack and provided between the first input/output port and the second input/output port in circuit configuration, wherein
- the band pass filter selectively passes signals within a passband greater than or equal to a first frequency and less than or equal to a second frequency, and includes at least one first resonator with open ends,
- the first and second frequencies are two frequencies at which an insertion loss is higher by a predetermined magnitude than a minimum value of the insertion loss in a frequency response of insertion loss between the first input/output port and the second input/output port,
- in the frequency response, an insertion loss in a frequency band less than the first frequency is higher than an insertion loss in the first frequency,
- in the frequency response, an insertion loss in a frequency band greater than the second frequency is higher than an insertion loss in the second frequency,
- the band elimination filter includes:
- a first input/output;
- a second input/output;
- a connection path connecting the first input/output and the second input/output, and
- a second resonator coupled to the connection path,
- the connection path includes an impedance transformer, and
- the second resonator includes a conductor line constituting a distributed constant line.
12 more elements
A multilayered filter device comprising:
- a multilayer stack including a plurality of dielectric layers and a plurality of conductor layers stacked together;
- a first input/output port and a second input/output port integrated with the multilayer stack;
- and
- a band pass filter and a band elimination filter each constructed using the multilayer stack and provided between the first input/output port and the second input/output port in circuit configuration, wherein
- the band pass filter includes at least one first resonator with open ends,
- the band elimination filter includes:
- a first input/output;
- a second input/output;
- a connection path connecting the first input/output and the second input/output, and
- a second resonator coupled to the connection path,
- the connection path includes an impedance transformer,
- the second resonator includes a conductor line constituting a distributed constant line;
- and
- the band elimination filter causes an insertion loss at a frequency twice as high as a center frequency of a passband of the band pass filter to be higher than in a case without the band elimination filter in a frequency response of insertion loss between the first input/output port and the second input/output port.
11 more elements
A multilayered filter device comprising:
- a multilayer stack including a plurality of dielectric layers and a plurality of conductor layers stacked together;
- a first input/output port and a second input/output port integrated with the multilayer stack;
- and
- a band pass filter and a band elimination filter each constructed using the multilayer stack and provided between the first input/output port and the second input/output port in circuit configuration, wherein
- the band pass filter includes at least one first resonator with open ends,
- the band elimination filter includes:
- a first input/output;
- a second input/output;
- a connection path connecting the first input/output and the second input/output, and
- a second resonator coupled to the connection path,
- the connection path includes an impedance transformer,
- the impedance transformer includes a through hole line portion,
- the through hole line portion includes at least one through hole provided in the multilayer stack, and
- the second resonator includes a conductor line constituting a distributed constant line.
11 more elements
A multilayered filter device comprising:
- a multilayer stack including a plurality of dielectric layers and a plurality of conductor layers stacked together;
- a first input/output port and a second input/output port integrated with the multilayer stack;
- and
- a band pass filter and a band elimination filter each constructed using the multilayer stack and provided between the first input/output port and the second input/output port in circuit configuration, wherein
- the band pass filter includes at least one first resonator with open ends,
- the band elimination filter includes:
- a first input/output;
- a second input/output;
- a connection path connecting the first input/output and the second input/output, and
- a second resonator coupled to the connection path,
- the connection path includes an impedance transformer,
- the second resonator includes a conductor line constituting a distributed constant line, and
- the conductor line has a first end directly connected to the connection path, and a second end farthest from the connection path in circuit configuration.
10 more elements
A multilayered filter device comprising:
- a multilayer stack including a plurality of dielectric layers and a plurality of conductor layers stacked together;
- a first input/output port and a second input/output port integrated with the multilayer stack;
- and
- a band pass filter and a band elimination filter each constructed using the multilayer stack and provided between the first input/output port and the second input/output port in circuit configuration, wherein
- the band pass filter includes a plurality of first resonators each with open ends,
- the plurality of first resonators are configured so that every two of the first resonators adjacent to each other in circuit configuration are electromagnetically coupled to each other,
- each of the plurality of first resonators includes a resonator conductor portion formed of a line of conductor,
- the resonator conductor portion includes a first end and a second end which are opposite ends of the line and are open,
- the band elimination filter includes:
- a first input/output;
- a second input/output;
- a connection path connecting the first input/output and the second input/output, and
- a second resonator coupled to the connection path,
- the connection path includes an impedance transformer, and
- the second resonator includes a conductor line constituting a distributed constant line.
12 more elements
Dependencies are inferred from the claim text.