Patent US4983938A successfully refreshed from Google Patents.
US4983938A
Expired / Lapsed
US
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Band-stop filter
Assignee: Kokusai Denki Electric Inc
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Filing: 1989-10-17
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Granted: 1991-01-08
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Expires: 2009-10-17
Abstract
Abstract A band-stop filter comprises a plurality of resonator units each comprised of an end-shorted coaxial resonator and a variable condenser connected in series therewith, a printed circuit board combining said resonator units in a multistage having thru-holes adjacent a bushing which isolates the inner conductor of the end-shorted coaxial resonator from the printed circuit board. A thru-hole conductor is provided in the thru-hole, and an adjusting screw having a radius is a little larger than the thru-hole. The adjusting screw can have both the proper torque and the electrical connection. The inner conductor surface of the resonator operates electrically as a stator and the adjusting screw operates as a rotor.
Inventors
- 👤 Kanemi Sasaki
- 👤 Sadao Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A band-stop filter comprising; a plurality of resonator units, each of said plurality of resonator units having an end-shorted coaxial resonator and a variable frequency control means for adjusting frequencies connected in series; printed circuit board means; said plurality of resonator units being multi-stage connected by said printed circuit board means; said printed circuit board means having thru-holes adjacent a bushing in each of said plurality of resonator units, said bushing isolating an inner conductor of each of said end-shorted coxial resonators from said printed circuit board means; coil means on said printed circuit board means connecting each of said plurality of resonator units to ground; a coupling capacitor on said printed circuit board means connecting adjacent pairs of said plurality of resonator units; said thru-holes in said printed circuit board means being coated with a conductor; and a frequency adjusting screw having a radius slightly larger than the hole formed by said conductive coating being threaded into said conductive coating.
Claim 2
Dependent Claim
161 words
A band-stop filter comprising; a plurality of resonator units, each of said plurality of resonator units having an end-shorted coaxial resonator and a variable frequency control means for adjusting frequencies connected in series; printed circuit board means; said plurality of resonator units being multi-stage connected by said printed circuit board means; said printed circuit board means having thru-holes adjacent a bushing in each of said plurality of resonator units, said bushing isolating an inner conductor of each of said end-shorted coxial resonators from said printed circuit board means; coil means on said printed circuit board means connecting each of said plurality of resonator units to ground; a coupling capacitor on said printed circuit board means connecting adjacent pairs of said plurality of resonator units; said thru-holes in said printed circuit board means being coated with a conductor; and a frequency adjusting screw having a radius slightly larger than the hole formed by said conductive coating being threaded into said conductive coating.
Claim 3
Dependent Claim
19 words
A band-stop filter according to claim 1 in which said series connected variable control means is a variable capacitor.
Claim 4
Dependent Claim
161 words
A band-stop filter comprising; a plurality of resonator units, each of said plurality of resonator units having an end-shorted coaxial resonator and a variable frequency control means for adjusting frequencies connected in series; printed circuit board means; said plurality of resonator units being multi-stage connected by said printed circuit board means; said printed circuit board means having thru-holes adjacent a bushing in each of said plurality of resonator units, said bushing isolating an inner conductor of each of said end-shorted coaxial resonators from said printed circuit board means; capacitive means on said printed circuit board means connecting each of said plurality of resonator units to ground; a coupling capacitor on said printed circuit board means connecting adjacent pairs of said plurality of resonator units; said thru-holes in said printed circuit board means being coated with a conductor; and a frequency adjusting screw having a radius slightly larger than the hole formed by such conductive coating being threaded into said conductive coating.
Claim 5
Dependent Claim
161 words
A band-stop filter comprising; a plurality of resonator units, each of said plurality of resonator units having an end-shorted coaxial resonator and a variable frequency control means for adjusting frequencies connected in series; printed circuit board means; said plurality of resonator units being multi-stage connected by said printed circuit board means; said printed circuit board means having thru-holes adjacent a bushing in each of said plurality of resonator units, said bushing isolating an inner conductor of each of said end-shorted coaxial resonators from said printed circuit board means; capacitive means on said printed circuit board means connecting each of said plurality of resonator units to ground; a coupling capacitor on said printed circuit board means connecting adjacent pairs of said plurality of resonator units; said thru-holes in said printed circuit board means being coated with a conductor; and a frequency adjusting screw having a radius slightly larger than the hole formed by such conductive coating being threaded into said conductive coating.
Claim 6
Dependent Claim
19 words
A band-stop filter according to claim 3 in which said series connected variable control means is a variable capacitor.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |