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:
Apr. 07, 2009
Filed:
Mar. 30, 2007
Paul F. Dixon, Wakefield, MA (US);
Michael P. Carpenter, Acton, MA (US);
Mary M. Osward, Holbrook, MA (US);
David A. Gibbs, Waban, MA (US);
Paul F. Dixon, Wakefield, MA (US);
Michael P. Carpenter, Acton, MA (US);
Mary M. Osward, Holbrook, MA (US);
David A. Gibbs, Waban, MA (US);
Emerson & Cuming Microwave Products, Inc., Randolph, MA (US);
Abstract
A system and method for the use of ultra high frequency RFID tags in conjunction with metal substrates, as well as substrates used to contain liquid. Briefly, an RFID isolator comprised of a material with complex magnetic permeability, used either by itself, or in combination with dielectric isolator material, is interposed between the RFID tag and the substrate. Alternatively, a material possessing at least two distinct dielectric constants is interposed between the RFID tag and the substrate, such that there is a high dielectric constant at the interface with the substrate, and a low dielectric constant at the interface with the RFID tag. This material can be a single material having a dielectric constant gradient, or alternatively, two or more separate layers, each with a uniform but different dielectric constant, sandwiched together.