US4422059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band-pass filter having multilayered coil structures
Assignee: Panasonic Holdings Corp
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Filing: 1982-03-31
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Granted: 1983-12-20
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Expires: 2002-03-31
Abstract
Abstract A band-pass filter comprising a shielded housing having a first and a second chamber. First and second quarter-wave resonators are disposed in the first and second chambers, respectively, for coupling with input energy and delivering output energy. First and second parallel-circuit resonators are disposed in the first and second chambers, respectively, to provide interstage coupling between resonators in the respective chambers. Each of the resonators comprises a multilayered coil structure on a finned bobbin juxtaposed on a common insulative substrate so that its coil portions are separately wound on adjacent fins of the bobbin. Each of the quarter-wave resonators has one end being short-circuited by coupling with the housing and the other end being open-circuited. Each of the parallel-circuit resonators includes a capacitor to form a parallel resonance circuit and has one end coupled to one end of the other parallel-circuit resonator at a point outside of the housing. First and second auxiliary coils are inductively coupled respectively with the parallel-circuit resonators, one end of each auxiliary coil being connected to the housing and the other ends of the auxiliary coils being coupled together to an external circuit.
Inventors
- 👤 Tsuneharu Fuji
- 👤 Masakatsu Tsumura
- 👤 Takayoshi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:11
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/09; H01; H01P; H01P7/00; H01P7/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
220 words
A band-pass filter comprising within a shielded housing having first and second chambers separated by a shielding plate: first and second quarter-wavelength resonators mounted respectively in said first and second chambers and each comprising a bobbin formed with a plurality of axially spaced apart fins and a multilayered coil structure having a plurality of coil portions each mounted between adjacent ones of said fins, said coil structure being open-circuited at one end thereof and short-circuited at the other end; first and second parallel-circuit resonators mounted respectively in said first and second chambers to provide interstage coupling with said first and second quarter-wavelength resonators and each comprising a capacitor and a bobbin having a plurality of fins and a multilayered coil structure having a plurality of coil portions each mounted between adjacent ones of the fins of said bobbins, one end of each of said parallel-circuit resonators being coupled to one end of the other parallel-circuit resonator at a circuit point outside of said shielded housing; first and second auxiliary coils inductively coupled with said first and second parallel-circuit resonators respectively, one end of each of said auxiliary coils being short-circuited and the other ends of said auxiliary coils being coupled together to said circuit point; and an input and an output coupling coil respectively coupled inductively with said quarter-wavelength resonators.
Claim 2
Dependent Claim
220 words
A band-pass filter comprising within a shielded housing having first and second chambers separated by a shielding plate: first and second quarter-wavelength resonators mounted respectively in said first and second chambers and each comprising a bobbin formed with a plurality of axially spaced apart fins and a multilayered coil structure having a plurality of coil portions each mounted between adjacent ones of said fins, said coil structure being open-circuited at one end thereof and short-circuited at the other end; first and second parallel-circuit resonators mounted respectively in said first and second chambers to provide interstage coupling with said first and second quarter-wavelength resonators and each comprising a capacitor and a bobbin having a plurality of fins and a multilayered coil structure having a plurality of coil portions each mounted between adjacent ones of the fins of said bobbins, one end of each of said parallel-circuit resonators being coupled to one end of the other parallel-circuit resonator at a circuit point outside of said shielded housing; first and second auxiliary coils inductively coupled with said first and second parallel-circuit resonators respectively, one end of each of said auxiliary coils being short-circuited and the other ends of said auxiliary coils being coupled together to said circuit point; and an input and an output coupling coil respectively coupled inductively with said quarter-wavelength resonators.
Claim 3
Dependent Claim
28 words
A band-pass filter as claimed in claim 1, further comprising a second coil interposed between one of said parallel-circuit resonators and one of said input and output coils.
Claim 4
Dependent Claim
32 words
A band-pass filter as claimed in claim 1, wherein said input and output coupling coils are disposed on the bobbins of said quarter-wavelength resonators in the form of a multilayered coil structure.
Claim 5
Dependent Claim
30 words
A band-pass filter as claimed in claim 2, wherein said second coil is mounted on a bobbin having a plurality of fins in the form of a multilayered coil structure.
Claim 6
Dependent Claim
24 words
A band-pass filter as claimed in claim 1, wherein each of said auxiliary coils are mounted on the bobbins of said parallel-circuit resonators, respectively.
Claim 7
Dependent Claim
32 words
A band-pass filter as claimed in claim 1, further comprising a second shielding plate formed with a coupling window and located between the resonators in each of said first and second chambers.
Claim 8
Dependent Claim
18 words
A band-pass filter as claimed in claim 1, wherein said shielding plate is formed with a coupling window.
Claim 9
Dependent Claim
234 words
A video intermediate frequency filter comprising; a shielded housing having first and second chambers separated by a shielding plate: first and second quarter-wavelength resonators mounted respectively in said first and second chambers and each comprising a bobbin formed with a plurality of axially spaced apart fins and a multilayered coil structure having a plurality of coil portions each wound between adjacent ones of said fins, said coil structure being open-circuited at one end thereof and short-circuited at the other end; first and second parallel-circuit resonators mounted respectively in said first and second chambers to provide interstage coupling with said first and second quarter-wavelength resonators and each comprising a capacitor and a bobbin having a plurality of fins and a multilayered coil structure having a plurality of coil portions each wound between adjacent ones of the fins of said bobbins, one end of each of said parallel-circuit resonators being coupled to one end of the other parallel-circuit resonator at a point outside of said shielded housing; first and second auxiliary coils inductively coupled with said first and second parallel-circuit resonators respectively, one end of each of said auxiliary coils being short-circuited and the other ends of said auxiliary coils being coupled together; an input and an output coupling coil respectively coupled inductively with said quarter-wavelength resonators; and a second coil interposed between one of said parallel-circuit resonators and one of said input and output coils.
Claim 10
Dependent Claim
234 words
A video intermediate frequency filter comprising; a shielded housing having first and second chambers separated by a shielding plate: first and second quarter-wavelength resonators mounted respectively in said first and second chambers and each comprising a bobbin formed with a plurality of axially spaced apart fins and a multilayered coil structure having a plurality of coil portions each wound between adjacent ones of said fins, said coil structure being open-circuited at one end thereof and short-circuited at the other end; first and second parallel-circuit resonators mounted respectively in said first and second chambers to provide interstage coupling with said first and second quarter-wavelength resonators and each comprising a capacitor and a bobbin having a plurality of fins and a multilayered coil structure having a plurality of coil portions each wound between adjacent ones of the fins of said bobbins, one end of each of said parallel-circuit resonators being coupled to one end of the other parallel-circuit resonator at a point outside of said shielded housing; first and second auxiliary coils inductively coupled with said first and second parallel-circuit resonators respectively, one end of each of said auxiliary coils being short-circuited and the other ends of said auxiliary coils being coupled together; an input and an output coupling coil respectively coupled inductively with said quarter-wavelength resonators; and a second coil interposed between one of said parallel-circuit resonators and one of said input and output coils.
References Cited (Backward Citations)
US3970972A
Cited
US4210884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |