Patent US4894629A successfully refreshed from Google Patents.
US4894629A
Expired / Lapsed
US
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Bandpass filter having magnetically coupled resonators
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-03-02
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Granted: 1990-01-16
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Expires: 2007-03-02
Abstract
Abstract A bandpass filter comprising a plurality of resonators coupled by a magnetic induction coupling. Each of the resonators includes an equivalent circuit having an LC series circuit and a capacitance element connected in parallel, the LC series circuit including one capacitance element and two inductance elements connected in series to both sides of the one capacitance element. This construction realizes the magnetic induction coupling by utilizing the inductance elements constituting the resonators, without necessitating a separate coupling means such as a capacitance element.
Inventors
- 👤 Hisatake Okamura
- 👤 Teruhisa Tsuru
- 👤 Masahiko Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:49
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/175; H03H7/09; H03H7/1758
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
A bandpass filter comprising: a plurality of resonators; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes an LC series circuit, and first capacitance element connected in parallel to said LC series circuit, said LC series current including a second capacitance element and two inductance elements, said second capacitance elements connected in series between said two inductance elements, and said magnetic induction coupling being provided by a coupling between at least one of said inductance elements of each adjacent pair of said resonators.
Claim 2
Dependent Claim
93 words
A bandpass filter comprising: a plurality of resonators; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes an LC series circuit, and first capacitance element connected in parallel to said LC series circuit, said LC series current including a second capacitance element and two inductance elements, said second capacitance elements connected in series between said two inductance elements, and said magnetic induction coupling being provided by a coupling between at least one of said inductance elements of each adjacent pair of said resonators.
Claim 3
Dependent Claim
99 words
A bandpass filter as claimed in claim 1, wherein each said resonator comprises dielectric substrate means, two sets of capacitor electrode layers respectively formed on a front face and a back face of said dielectric substrate means and each set of capacitor electrode layers are opposed to each other across said electric substrate means, a first coil layer interconnecting the two of said capacitor electrode layers formed on the front face of said dielectric substrate means, and a second coil layer interconnecting the two of said capacitor electrode layers formed on the back face of said dielectric substrate means.
Claim 4
Dependent Claim
18 words
A bandpass filter as claimed in claim 2 wherein each said resonator is formed on separate dielectric substrates.
Claim 5
Dependent Claim
20 words
A bandpass filter as claimed in claim 2 wherein all of said resonators are formed on a single dielectric substrate.
Claim 6
Dependent Claim
55 words
A bandpass filter as claimed in claim 1 wherein each of said resonators comprises a substrate means, said two, inductance elements being two coil layers arranged parallel to each other on a front face of said substrate means, and said first and second capacitance elements being two capacitors interconnecting opposite end of said coil layers.
Claim 7
Dependent Claim
16 words
A bandpass filter as claimed in claim 5 wherein said substrate means is formed of ferrite.
Claim 8
Dependent Claim
23 words
A bandpass filter as claimed in claim 5 wherein therefor said plurality of said resonators are all formed on a single dielectric substrate.
Claim 9
Dependent Claim
32 words
A bandpass filter as claimed in claim 1 wherein at least one adjacent pair of said resonators are directly coupled by means of a coil in addition to said magnetic induction coupling.
Claim 10
Dependent Claim
24 words
A bandpass filter as claimed in claim 8 wherein said resonators and said coil are formed on said dielectric substrate means by screen printing.
Claim 11
Dependent Claim
99 words
A bandpass filter as claimed in claim 8 wherein each said resonator comprises dielectric substrate means, two sets of capacitor electrode layers respectively formed on a front face and a back face of said dielectric substrate means and each set of capacitor electrode layers are opposed to each other across said dielectric substrate means, a first coil layer interconnecting the two of said capacitor electrode layers formed on the front face of said dielectric substrate means, and a second coil layer interconnecting the two of said capacitor electrode layers formed on the back face of said dielectric substrate means.
Claim 12
Dependent Claim
76 words
A bandpass filter comprising: a plurality of resonators; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes a substrate, two coil layers formed on one of principal surfaces of the substrate, and two capacitors each interconnecting opposed ends of said two coil layers, said magnetic induction coupling being provided by a coupling between at least one of said coil layers of adjacent pairs of said resonators.
Claim 13
Dependent Claim
76 words
A bandpass filter comprising: a plurality of resonators; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes a substrate, two coil layers formed on one of principal surfaces of the substrate, and two capacitors each interconnecting opposed ends of said two coil layers, said magnetic induction coupling being provided by a coupling between at least one of said coil layers of adjacent pairs of said resonators.
Claim 14
Dependent Claim
22 words
A bandpass filter as claimed in claim 11 wherein said plurality of said resonators are all formed on a single dielectric substrate.
Claim 15
Dependent Claim
16 words
A bandpass filter as claimed in claim 11 wherein said substrate means is formed of ferrite.
Claim 16
Dependent Claim
126 words
A bandpass filter comprising: a plurality of resonators formed on a dielectric substrate means; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes two pairs of capacitor electrode layers formed on a front face and a back face of said dielectric substrate means and opposed to each other across said dielectric substrate means, a first coil layer interconnecting two of said capacity electrode layers formed on the front face of said dielectric substrate means, and a second coil layer interconnecting two of said capacitor electrode layers formed on the back face of said dielectric substrate means, said magnetic induction coupling being provided by a coupling between said coil layers of an adjacent pair of said resonators.
Claim 17
Dependent Claim
126 words
A bandpass filter comprising: a plurality of resonators formed on a dielectric substrate means; and a magnetic induction coupling being established between adjacent pairs of said resonators, wherein each of said resonators includes two pairs of capacitor electrode layers formed on a front face and a back face of said dielectric substrate means and opposed to each other across said dielectric substrate means, a first coil layer interconnecting two of said capacity electrode layers formed on the front face of said dielectric substrate means, and a second coil layer interconnecting two of said capacitor electrode layers formed on the back face of said dielectric substrate means, said magnetic induction coupling being provided by a coupling between said coil layers of an adjacent pair of said resonators.
Claim 18
Dependent Claim
18 words
A bandpass filter as claimed in claim 14 wherein each said resonator is formed on separate dielectric substrates.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |