Patent US3701958A successfully refreshed from Google Patents.
US3701958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multisection bandpass filter from small signal circuits
Assignee: SABA GmbH
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Filing: 1970-12-18
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Granted: 1972-10-31
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Expires: 1990-12-18
Abstract
Abstract Individual sections of the filter are printed on separate circuit boards, the rear faces of which are covered with a shielding layer. The boards are sandwiched together, separated by insulating plates, resulting pile forming the multisection filter.
Inventors
- 👤 Herbert Jaag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:36
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A multisection filter comprising, in combination, a plurality of stacked printed circuit boards, each printed circuit board having printed on one face thereof one section of the filter, and on the other face thereof being covered by a conductive shielding layer, said shielding layer being provided with at least one coupling slot for coupling electromagnetic energy therethrough; and a plurality of insulating plates arranged between pairs of adjacent printed circuit boards to separate the printed filter section of one printed circuit board from the conductive shielding layer of an adjacent printed circuit board, said slot being arranged in relation to two adjacent filter sections which are arranged on each side of the respective shielding layer so as to couple energy from one filter section to the adjoining filter section through said slot.
Claim 2
Dependent Claim
132 words
A multisection filter comprising, in combination, a plurality of stacked printed circuit boards, each printed circuit board having printed on one face thereof one section of the filter, and on the other face thereof being covered by a conductive shielding layer, said shielding layer being provided with at least one coupling slot for coupling electromagnetic energy therethrough; and a plurality of insulating plates arranged between pairs of adjacent printed circuit boards to separate the printed filter section of one printed circuit board from the conductive shielding layer of an adjacent printed circuit board, said slot being arranged in relation to two adjacent filter sections which are arranged on each side of the respective shielding layer so as to couple energy from one filter section to the adjoining filter section through said slot.
Claim 3
Dependent Claim
56 words
A filter as defined in claim 1, wherein said filter sections include inductance means on said one face of the respective printed circuit board, and wherein said slot in said shielding layer on said other face is at least partially directly behind said inductance means for permitting inductive coupling between adjacent successive sections of the filter.
Claim 4
Dependent Claim
55 words
A filter as defined in claim 1, wherein said filter sections include capacitor means on said one face of the respective printed circuit board, and wherein said slot in said shielding layer on said other face is at least partially directly behind said capacitor means for permitting capacitive coupling between successive sections of the filter.
Claim 5
Dependent Claim
24 words
A filter as defined in claim 1, wherein the filter section and the conductive shielding layer are both integral with the printed circuit board.
Claim 6
Dependent Claim
18 words
A filter as defined in claim 2, wherein the inductively coupling slots of the shielding layers are staggered.
Claim 7
Dependent Claim
18 words
A filter as defined in claim 3, wherein the capacitively coupling windows of the shielding layers are staggered.
Claim 8
Dependent Claim
41 words
A filter as defined in claim 1, wherein each printed filter section includes capacitor and inductor means, and further including a coating at reference potential and surrounding said capacitor and conductor means of each section for shielding and damping the latter.
Claim 9
Dependent Claim
111 words
A filter as defined in claim 1, wherein one end face of each printed circuit board has a shielding layer that is at reference potential, and one exposed face of said stack is formed by said shielding layer of the printed circuit board having the first section of the filter, and said stack further comprising an insulating plate having on one face thereof a shielding layer at reference potential, said insulating plate contacting the nth printed circuit board and said shielding layer of said plate forming the exposed other end face of said stack, whereby the shielding layer of the two exposed end faces compose a shield for the multi-section filter.
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |