Method and apparatus for a PCB and I/O integrated electromagnetic containment

Patent 5165055 Issued on November 17, 1992. Estimated Expiration Date:

June 28, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3681612

Multilayered printed circuit board with controlled 100 ohm impedance
Patent #: 4560962
Issued on: 12/24/1985
Inventor: Barrow

Isolation of RF signals in a RF shield aperture
Patent #: 4622527
Issued on: 11/11/1986
Inventor: Carlson

Electromagnetic interference reducing assembly
Patent #: 4641224
Issued on: 02/03/1987
Inventor: Reimer

RF signal shielding enclosure of electronic systems
Patent #: 4658334
Issued on: 04/14/1987
Inventor: McSparran , et al.

Shielding apparatus for a printed circuit board
Patent #: 4739453
Issued on: 04/19/1988
Inventor: Kurokawa

Jack coaxial connector EMI shielding apparatus
Patent #: 4827378
Issued on: 05/02/1989
Inventor: Gillan , et al.

RF interconnect and shielding system
Patent #: 4868716
Issued on: 09/19/1989
Inventor: Taylor , et al.

Circuit board configuration for reducing signal distortion
Patent #: 4904968
Issued on: 02/27/1990
Inventor: Theus

Multi-layer circuit board that suppresses radio frequency interference from high frequency signals
Patent #: 4954929
Issued on: 09/04/1990
Inventor: Baran

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Inventor

Metsler, Alexander

Assignee

Digital Equipment Corporation

Application

No. 723151 filed on 06/28/1991

US Classes:

333/12, TRANSMISSION LINE INDUCTIVE OR RADIATION INTERFERENCE REDUCTION SYSTEMS333/181, Smoothing type (e.g., direct current power supply filters or decoupling filters)333/185, Having significant physical structure361/818EMI

Examiners

Primary: LaRoche, Eugene R.
Assistant: Neyzari, Ali

Attorney, Agent or Firm

Brinkman; Dirk, Young; Barry, Myrick; Ronald E.

International Classes

H04B 003/28
H03H 007/00

Abstract

An integrated electromagnetic and radio frequency interference (EMI/RFI) shielding apparatus contains EMI/RFI produced by a computer system. In particular the apparatus isolates input/output (I/O) connectors of the computer system from EMI/RFI produced by noisy components of the system. The shielding apparatus comprises a printed circuit board (PCB) partitioned into two electromagnetically isolated zones separated by a non-conducting void. Components that are EMI/RFI producers, such as the CPU and clock, are mounted in a first zone, and components which need to be isolated, such as input/output connectors are mounted in a second zone. The various conducting layers in the PCB are arranged and filtered to inhibit EMI/RFI propagation to the I/O connectors. Additionally, the I/O connectors are isolated from EMI/RFI by a secondary EMI/RFI shield.