Patent US4480175A successfully refreshed from Google Patents.
Patent EP1067618A2 successfully refreshed from Google Patents.
EP1067618A2
Expired / Lapsed
EP
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Laminated filter, duplexer, and mobile communication apparatus using the same
Assignee: Panasonic Corp
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Filing: 2000-07-03
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Granted: —
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Expires: 2020-07-03
Abstract
Abstract In a laminated filter comprising a plurality of resonator electrodes, an inter-resonator coupling capacitor electrode for coupling adjacent resonators, and two input/output coupling capacitor electrodes for coupling input/output terminals and the resonator electrodes , the invention provides a capacitor electrode for electrically connecting one side of the input/output terminals with a portion of the input/output coupling capacitor electrode, wherein the input/output coupling capacitor electrode and the capacitor electrode compose a parallel circuit. This structure forms a parallel resonance circuit in the input/output terminal , so as to provide an additional attenuation pole besides an attenuation pole formed with an electromagnetic coupling between the resonators and an inter-resonator capacitance, thereby realizing the laminated filter of a high attenuation with a same shape as that of the prior art. With this structure, a duplexer can be composed by using a plurality of the filters of this invention without requiring a phase-shifting circuit.
Inventors
- 👤 Hiroshi Kushitani
- 👤 Toru Yamada
- 👤 Makoto Fujikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:58
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345; H01P1/2039; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
59 words
A laminated filter comprising: input/output terminals; and at least one capacitor composed of at least a portion of an electrode
connecting directly to one of said input/output terminals, as one of electrodes, and
another electrodes connecting directly to said one input/output terminal, wherein said electrode connecting directly to said one input/output terminal
and said capacitor form a parallel circuit.
Claim 2
Dependent Claim
38 words
The laminated filter according to claim 1, further comprising: a plurality of resonators; an inter-resonator coupling capacitor for coupling said plurality of
resonators; and an input/output coupling capacitor for coupling said plurality of resonators
to said input/output terminal.
Claim 3
Dependent Claim
45 words
The laminated filter according to claim 2, wherein said capacitor
comprises one of the electrodes consisting of at least a portion of a transmission line
branched off from one of electrodes of said input/output coupling capacitor, said
one electrode connecting directly to said input/output terminal.
Claim 4
Dependent Claim
24 words
The laminated filter according to claim 2, wherein a resonance frequency
of said parallel circuit is within an attenuation band of said laminated filter.
Claim 5
Dependent Claim
19 words
The laminated filter according to claim 2, wherein said parallel circuit is
formed in both of said input/output terminals.
Claim 6
Dependent Claim
49 words
The laminated filter according to claim 1, further comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of capacitors; and a plurality of resonators, wherein said transmission line and said plurality of resonators are
individually connected by said capacitors.
Claim 7
Dependent Claim
35 words
The laminated filter according to claim 6, wherein each of said plurality
of capacitors comprises one side of electrodes consisting of at least a portion of a
transmission line branched off from said transmission line.
Claim 8
Dependent Claim
24 words
The laminated filter according to claim 6, wherein a resonance frequency
of said parallel circuit is within an attenuation band of said laminated filter.
Claim 9
Dependent Claim
19 words
The laminated filter according to claim 6, wherein said parallel circuit is
formed in both of said input/output terminals.
Claim 10
Dependent Claim
36 words
The laminated filter according to claim 1, further comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; and a capacitor for coupling said transmission line to a ground.
Claim 11
Dependent Claim
31 words
The laminated filter according to claim 10, wherein said capacitor
comprises one side of electrodes consisting of at least a portion of a transmission
line branched off from said transmission line.
Claim 12
Dependent Claim
19 words
The laminated filter according to claim 10, wherein said parallel circuit
is formed in both of said input/output terminals.
Claim 13
Dependent Claim
45 words
The laminated filter according to claim 1, further comprising: at least one transmission line arranged in a manner that portions thereof
overlap with both of said electrodes connecting directly to said input/output
terminals; and a transmission line connecting between said transmission line to a ground.
Claim 14
Dependent Claim
38 words
The laminated filter according to claim 13, wherein said capacitor
comprises one side of electrodes consisting of at least a portion of a transmission
line branched off from one of said electrodes connecting directly to said
input/output terminals.
Claim 15
Dependent Claim
19 words
The laminated filter according to claim 13, wherein said parallel circuit
is formed in both of said input/output terminals.
Claim 16
Dependent Claim
123 words
A duplexer comprising two laminated filters, each of said laminated filters having at least one capacitor, wherein one side
of electrodes of said capacitor consists of any one of (a) at least a portion of an
electrode connecting directly to one of input/output terminals, and (b) at least a
portion of a transmission line branched off from said electrode connecting directly
to said one input/output terminal, and the other side of electrodes connects directly
to said one input/output terminal, and said electrode connecting directly to said one input/output terminal forms a
parallel circuit with said capacitor, wherein said two laminated filters are connected together at each side of
said one input/output terminal where said parallel circuit is formed, to compose a
common terminal.
Claim 17
Dependent Claim
100 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: a plurality of first resonators; an inter-resonator coupling capacitor for coupling between said first
resonators; and an input/output coupling capacitor for coupling said first resonators and
said input/output terminals individually, and said second filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of capacitors; and a plurality of second resonators, wherein said transmission line and each of said second resonators are
individually connected by said capacitors.
Claim 18
Dependent Claim
88 words
The duplexer according to claim 17, wherein: said first filter is provided with an attenuation band in a first band and a
pass band in a second band, and a resonance frequency of said parallel circuit of
said first filter is in vicinity of said first band; and said second filter is provided with a pass band in said first band and an
attenuation band in said second band, and a resonance frequency of said parallel
circuit of said second filter is in vicinity of said second band.
Claim 19
Dependent Claim
88 words
The duplexer according to claim 17, wherein: said first filter is provided with a pass band in a first band and an
attenuation band in a second band, and a resonance frequency of said parallel circuit
of said first filter is in vicinity of said second band; and said second filter is provided with an attenuation band in said first band and
a pass band in said second band, and a resonance frequency of said parallel circuit
of said second filter is in vicinity of said first band.
Claim 20
Dependent Claim
20 words
The duplexer according to claim 17, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 21
Dependent Claim
92 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: a plurality of first resonators; a first inter-resonator coupling capacitor for coupling between said first
resonators; and a first input/output coupling capacitor for coupling said first resonators and
said input/output terminals individually, and said second filter comprising: a plurality of second resonators; a second inter-resonator coupling capacitor for coupling between said
second resonators; and a second input/output coupling capacitor for coupling said second
resonators and said input/output terminals individually.
Claim 22
Dependent Claim
100 words
The duplexer according to claim 21, wherein: one of said first filter and said second filter is provided with an attenuation
band in a first band and a pass band in a second band, and a resonance frequency of
said parallel circuit of said one filter is in vicinity of said first band; and another of said first filter and said second filter is provided with a pass band
in said first band and an attenuation band in said second band, and a resonance
frequency of said parallel circuit of said another filter is in vicinity of said second
band.
Claim 23
Dependent Claim
20 words
The duplexer according to claim 21, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 24
Dependent Claim
119 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: a first transmission line connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of first capacitors; and a plurality of first resonators; wherein said first transmission line and each of said first resonators are
individually connected by said first capacitors; and said second filter comprising: a second transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of second capacitors; and a plurality of second resonators, wherein said second transmission line and each of said second resonators
are individually connected by said second capacitors.
Claim 25
Dependent Claim
100 words
The duplexer according to claim 24, wherein: one of said first filter and said second filter is provided with an attenuation
band in a first band and a pass band in a second band, and a resonance frequency of
said parallel circuit of said one filter is in vicinity of said first band; and another of said first filter and said second filter is provided with a pass band
in said first band and an attenuation band in said second band, and a resonance
frequency of said parallel circuit of said another filter is in vicinity of said second
band.
Claim 26
Dependent Claim
20 words
The duplexer according to claim 24, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 27
Dependent Claim
82 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: a plurality of resonators; an inter-resonator coupling capacitor for coupling between said resonators;
and an input/output coupling capacitor for coupling said resonators and said
input/output terminals individually, and said second filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; and a capacitor for coupling said transmission line to a ground.
Claim 28
Dependent Claim
80 words
The duplexer according to claim 27, wherein: said first filter is provided with an attenuation band in a first band and a
pass band in a second band, and a resonance frequency of said parallel circuit of
said first filter is in vicinity of said first band; and said second filter is provided with a pass band in said first band, and a
resonance frequency of said parallel circuit of said second filter is in vicinity of said
second band.
Claim 29
Dependent Claim
20 words
The duplexer according to claim 27, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 30
Dependent Claim
92 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: at least one transmission line arranged in a manner that portions thereof
overlap with both of said electrodes connecting directly to said input/output
terminals; and another transmission line for connecting between said transmission line and
a ground, and said second filter comprising: a plurality of resonators; an inter-resonator coupling capacitor for coupling between said resonators;
and an input/output coupling capacitor for coupling said resonators and said
input/output terminals individually.
Claim 31
Dependent Claim
80 words
The duplexer according to claim 30, wherein: said first filter is provided with a pass band in a second band, and a
resonance frequency of said parallel circuit of said first filter is in vicinity of a first
band; and said second filter is provided with a pass band in said first band and an
attenuation band in said second band, and a resonance frequency of said parallel
circuit of said second filter is in vicinity of said second band.
Claim 32
Dependent Claim
20 words
The duplexer according to claim 30, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 33
Dependent Claim
107 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: at least one transmission line arranged in a manner that portions thereof
overlap with both of said electrodes connecting directly to said input/output
terminals; and another transmission line for connecting between said transmission line and
a ground, and said second filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of capacitors; and a plurality of resonators, and having a structure connecting said transmission line and each of said
resonators individually by said capacitors.
Claim 34
Dependent Claim
80 words
The duplexer according to claim 33, wherein: said first filter is provided with a pass band in a second band, and a
resonance frequency of said parallel circuit of said first filter is in vicinity of a first
band; and said second filter is provided with a pass band in said first band and an
attenuation band in said second band, and a resonance frequency of said parallel
circuit of said second filter is in vicinity of said second band.
Claim 35
Dependent Claim
20 words
The duplexer according to claim 33, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 36
Dependent Claim
97 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; a plurality of capacitors; and a plurality of resonators, and having a structure connecting said transmission line and each of said
resonators individually by said capacitors, and said second filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; and a capacitor for coupling said transmission line to a ground.
Claim 37
Dependent Claim
80 words
The duplexer according to claim 36, wherein: said first filter is provided with an attenuation band in a first band and a
pass band in a second band, and a resonance frequency of said parallel circuit of
said first filter is in vicinity of said first band; and said second filter is provided with a pass band in said first band, and a
resonance frequency of said parallel circuit of said second filter is in vicinity of said
second band.
Claim 38
Dependent Claim
20 words
The duplexer according to claim 36, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 39
Dependent Claim
92 words
The duplexer according to claim 16, wherein said two laminated filters
comprise a first filter and a second filter, said first filter comprising: at least one transmission line arranged in a manner that portions thereof
overlap with both of said electrodes connecting directly to said input/output
terminals; and another transmission line for connecting between said transmission line and
a ground, and said second filter comprising: a transmission line for connecting between both of said electrodes
connecting directly to said input/output terminals; and a capacitor for coupling said transmission line to a ground.
Claim 40
Dependent Claim
72 words
The duplexer according to claim 39, wherein: said first filter is provided with a pass band in a second band, and a
resonance frequency of said parallel circuit of said first filter is in vicinity of a first
band; and said second filter is provided with a pass band in said first band, and a
resonance frequency of said parallel circuit of said second filter is in vicinity of said
second band.
Claim 41
Dependent Claim
20 words
The duplexer according to claim 39, having an integrated structure
containing said first and said second filters within a dielectric.
Claim 42
Dependent Claim
21 words
A mobile communication apparatus characterized by employing a
laminated filter as recited in any one of claim 1 through claim 15.
Claim 43
Dependent Claim
20 words
A mobile communication apparatus characterized by employing a
duplexer as recited in any one of claim 16 through claim 41.
References Cited (Backward Citations)
No citation records indexed.
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