US5483413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling electromagnetic interference from multi-layered circuit boards
Assignee: Hewlett Packard Development Co LP
•
Filing: 1994-10-24
•
Granted: 1996-01-09
•
Expires: 2014-10-24
Abstract
Abstract A printed circuit board is shown to include at least one layer formed from electrically insulating material and a power plane formed on the layer. The outer perimeter of the power plane is spaced away from the outer edge of the layer thereby defining an outer area. A conductive structure is formed in the outer area, spaced from and surrounding the power plane and adapted to be connected to ground. Electromagnetic radiation emanating from the power plane is caused to terminate on the conductive structure. A multi-layered printed circuit board can also include a first layer of electrically insulating material, a ground plane formed on the first layer, a second layer of electrically insulating material and a power plane formed on the second layer. The outer perimeter of the power plane is spaced away from the outer edge of the second layer. A conductive structure is formed on the second layer in the outer layer, spaced from and surrounding the power plane, wherein the conductive structure is electrically connected to the ground plane. In an alternate embodiment wherein the power plane and ground plane are formed on opposite sides of the same layer, the thickness of the layer and the distance the power plane is spaced away from the outer edge of the layer are sufficient so that electromagnetic radiation emanating from the power plane is caused to terminate on the ground plane.
Inventors
- 👤 Samuel M. Babb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:11
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A printed circuit board, comprising: a layer formed from electrically insulating material; a power plane formed on said layer, the outer perimeter of said power plane being spaced away from the outer edge of said layer so as to define an outer area; and a conductive structure, formed on said layer in said outer area, adjacent to and surrounding said power plane, and connected to ground so as to cause electromagnetic radiation emanating from said power plane to be terminated on said conductive structure.
Claim 2
Dependent Claim
84 words
A printed circuit board, comprising: a layer formed from electrically insulating material; a power plane formed on said layer, the outer perimeter of said power plane being spaced away from the outer edge of said layer so as to define an outer area; and a conductive structure, formed on said layer in said outer area, adjacent to and surrounding said power plane, and connected to ground so as to cause electromagnetic radiation emanating from said power plane to be terminated on said conductive structure.
Claim 3
Dependent Claim
30 words
The printed circuit board of claim 1, wherein said power plane defines a plane and wherein said conductive structure is formed to completely surround said power plane within said plane.
Claim 4
Dependent Claim
111 words
A multi-layered printed circuit board, comprising: a first layer of electrically insulating material; a ground plane formed on said first layer; a second layer of electrically insulating material formed on said ground plane; a power plane formed on said second layer, the outer perimeter of said power plane being spaced away from the outer edge of said second layer so as to define an outer area; and a conductive structure, formed on said second layer in said outer area, adjacent to and surrounding said power plane, and electrically connected to said ground plane so as to cause electromagnetic radiation emanating from said power plane to be terminated on said conductive structure.
Claim 5
Dependent Claim
111 words
A multi-layered printed circuit board, comprising: a first layer of electrically insulating material; a ground plane formed on said first layer; a second layer of electrically insulating material formed on said ground plane; a power plane formed on said second layer, the outer perimeter of said power plane being spaced away from the outer edge of said second layer so as to define an outer area; and a conductive structure, formed on said second layer in said outer area, adjacent to and surrounding said power plane, and electrically connected to said ground plane so as to cause electromagnetic radiation emanating from said power plane to be terminated on said conductive structure.
Claim 6
Dependent Claim
44 words
The printed circuit board of claim 3, wherein said second layer has bores formed therethrough in said outer area and further comprising electrically conductive material positioned within said bores so that an electrical connection is formed between said conductive structure and said ground plane.
Claim 7
Dependent Claim
18 words
The printed circuit board of claim 3, wherein said ground plane is substantially co-extensive with said first layer.
Claim 8
Dependent Claim
27 words
The printed circuit board of claim 3, wherein said power plane defines a plane and wherein said conductive structure completely surrounds said power plane within said plane.
Claim 9
Dependent Claim
102 words
A multi-layered printed circuit board having a surface on which electronic devices are to be mounted, comprising: a ground plane; a layer of electrically insulating material, formed on and covering an entire surface of said ground plane; and a power plane formed on said layer and positioned closer to said surface than said ground plane, the outer perimeter of said power plane being spaced a distance away from the outer edge of said layer, wherein a thickness of said layer and said distance are sufficient so that electromagnetic radiation emanating from said power plane is caused to terminate on said ground plane.
Claim 10
Dependent Claim
102 words
A multi-layered printed circuit board having a surface on which electronic devices are to be mounted, comprising: a ground plane; a layer of electrically insulating material, formed on and covering an entire surface of said ground plane; and a power plane formed on said layer and positioned closer to said surface than said ground plane, the outer perimeter of said power plane being spaced a distance away from the outer edge of said layer, wherein a thickness of said layer and said distance are sufficient so that electromagnetic radiation emanating from said power plane is caused to terminate on said ground plane.
Claim 11
Dependent Claim
15 words
The printed circuit board of claim 7, wherein said thickness is less than said distance.
References Cited (Backward Citations)
US4450029A
Cited
US4694123A
Cited
US4670347A
Cited
US5043526A
Cited
US5136471A
Cited
US4904968A
Cited
US4899439A
Cited
US5072075A
Cited
US5029041A
Cited
US5043848A
Cited
US5081563A
Cited
US5068631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |