US4586007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Notch filter
Assignee: RCA Corp
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Filing: 1984-10-22
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Granted: 1986-04-29
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Expires: 2004-10-22
Abstract
Abstract A two-cavity notch filter including an input terminal inductively coupled to an output terminal having a low impedance connection therebetween, a first relatively high impedance resonant tank circuit including the series combination of a circuit grounded capacitor and circuit grounded inductor having a tap point thereon, a capacitor and optionally in series therewith an inductor connected between the input terminal and tap point. The notch filter also includes a second relatively high impedance resonant tank circuit including the series connection of a circuit grounded capacitor and circuit grounded inductor having a tap thereon, and a capacitor and, optionally, in series therewith an inductor between the output terminal and tap point of the second tank circuit inductor. There is capacitive coupling between the capacitors forming the first and second tank circuits.
Inventors
- 👤 Andrew Ciszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
H; H03; H03H; H03H1/00; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/1791
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A notch filter comprising in combination: an input terminal; an output terminal; means inductively coupling said input terminal to said output terminal forming a relatively low impedance circuit therebetween; first and second relatively high impedance energy storage resonant tank circuits; first means capacitively coupling said first energy storage resonant tank circuit to said input terminal providing direct current (dc) blocking therebetween, said first means also including means for providing impedance matching therebetween; second means capacitively coupling said second energy storage resonant tank circuit to said output terminal for providing dc blocking therebetween, said second means also including means for providing impedance matching therebetween; and means coupling said first and second tank circuits together to provide phase cancellation therebetween.
Claim 2
Dependent Claim
118 words
A notch filter comprising in combination: an input terminal; an output terminal; means inductively coupling said input terminal to said output terminal forming a relatively low impedance circuit therebetween; first and second relatively high impedance energy storage resonant tank circuits; first means capacitively coupling said first energy storage resonant tank circuit to said input terminal providing direct current (dc) blocking therebetween, said first means also including means for providing impedance matching therebetween; second means capacitively coupling said second energy storage resonant tank circuit to said output terminal for providing dc blocking therebetween, said second means also including means for providing impedance matching therebetween; and means coupling said first and second tank circuits together to provide phase cancellation therebetween.
Claim 3
Dependent Claim
62 words
The combination as set forth in claim 1 wherein each of said first and second relatively high impedance energy storage resonant tank circuits comprises an adjustable capacitor in series with an inductor, the distal ends of each being connected to circuit ground and wherein said first means and second means are coupled to a tap point on the respective tank circuit inductors.
Claim 4
Dependent Claim
27 words
The combination as set forth in claim 1 wherein each of said first means and second means comprises a dc blocking capacitor series coupled with an inductor.
Claim 5
Dependent Claim
64 words
The combination as set forth in claim 2 wherein each of said first means and second means comprises a dc blocking capacitor series coupled with an inductor, the distal ends of said dc blocking capacitors being connected to the input and output terminals, respectively, the distal ends of said inductors being coupled to the tap points of said first and second tank circuits, respectively.
Claim 6
Dependent Claim
30 words
The combination as set forth in claim 1 wherein said means coupling said first and second tank circuits together comprises means capacitively coupling said first and second tank circuits together.
Claim 7
Dependent Claim
33 words
The combination as set forth in claim 5 wherein said means capacitively coupling said first and second tank circuits together comprises a phantom capacitor realized by the physical construction of said notch filter.
Claim 8
Dependent Claim
179 words
A two-cavity notch filter comprising in combination: an input terminal; an output terminal; means inductively coupling said input terminal to said output terminal forming a relatively low impedance circuit therebetween; a first capacitor connected between said input terminal and circuit ground; a second capacitor connected between said output terminal and circuit ground; first and second relatively high impedance energy storage resonant tank circuits, each tank circuit comprising the series connection of a capacitor and an inductor connected at their distal ends to circuit ground, each said inductor including a tap point; first means capacitively coupling said tap point of said first energy storage resonant tank circuit to said input terminal providing direct current (dc) blocking therebetween, said first means also including means for providing impedance matching therebetween; second means capacitively coupling said tap point of said second energy storage resonant tank circuit to said the output terminal for providing dc blocking therebetween, said second means also including means for providing impedance matching therebetween; and means capacitively coupling said first and second tank circuits together to provide phase cancellation therebetween.
Claim 9
Dependent Claim
179 words
A two-cavity notch filter comprising in combination: an input terminal; an output terminal; means inductively coupling said input terminal to said output terminal forming a relatively low impedance circuit therebetween; a first capacitor connected between said input terminal and circuit ground; a second capacitor connected between said output terminal and circuit ground; first and second relatively high impedance energy storage resonant tank circuits, each tank circuit comprising the series connection of a capacitor and an inductor connected at their distal ends to circuit ground, each said inductor including a tap point; first means capacitively coupling said tap point of said first energy storage resonant tank circuit to said input terminal providing direct current (dc) blocking therebetween, said first means also including means for providing impedance matching therebetween; second means capacitively coupling said tap point of said second energy storage resonant tank circuit to said the output terminal for providing dc blocking therebetween, said second means also including means for providing impedance matching therebetween; and means capacitively coupling said first and second tank circuits together to provide phase cancellation therebetween.
Claim 10
Dependent Claim
64 words
The combination as set forth in claim 7 wherein each of said first means and second means comprises a dc blocking capacitor series coupled with an inductor, the distal ends of said dc blocking capacitors being connected to the input and output terminals, respectively, the distal ends of said inductors being coupled to the tap points of said first and second tank circuits, respectively.
Claim 11
Dependent Claim
33 words
The combination as set forth in claim 8 wherein said means capacitively coupling said first and second tank circuits together comprises a phantom capacitor realized by the physical construction of said notch filter.
References Cited (Backward Citations)
US3103554A
Cited
US2907960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |