The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1999
Filed:
Aug. 28, 1996
Harry Kroger, Vestal, NY (US);
The Research Foundation of State University of New York, Binghamton, NY (US);
Abstract
The present invention features a method of noise reduction in both packaging structures and circuit boards, as well as articles of manufacture that result from this method. Both the method and the articles weaken and effectively reduce undesirable noise signals that propagate as waves to and from the perimeter of circuit boards. The method of the invention adds absorbent materials in various structural configurations to strategic areas about the exterior and interior of the circuit boards. In order to absorb noise signals, these added materials are placed around lines and vias of the circuit boards, as well as at their ends and perimeters. Non-absorbent materials must contiguously surround the lines and vias; otherwise, absorbent material will absorb desired signals, as well as noise. The method of this invention tries to match the dielectric constant of the added, absorbent materials with the dielectric constant of the non-absorbent, dielectric materials found on the circuit board. The absorbent materials are known as 'lossy' dielectrics, and are chosen in some instances for their magnetic, rather than their electric, absorption properties.