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:
Jul. 03, 2001
Filed:
May. 04, 1998
Applicant:
Inventors:
Assignee:
Nortel Networks Limited, Montreal, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 3/728 ; G01R 2/320 ; G01R 1/24 ; H05K 9/00 ;
U.S. Cl.
CPC ...
G01R 3/728 ; G01R 2/320 ; G01R 1/24 ; H05K 9/00 ;
Abstract
An electromagnetic field generator is provided which consists of a regulated self contained voltage supply connected to a high frequency clock which drives one or more printed circuit board antennas. The clock may be a TTL or ECL based clock for example. The electromagnetic field generator is used in a method of testing the shielding effectiveness of an enclosure. Two measurements are made with a measurement antenna of emissions from the electromagnetic field generator, one with the enclosure in place and another without the enclosure in place, the shielding effectiveness being the difference between these two measurements.