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. 31, 2001
Filed:
Dec. 12, 1997
Alfred Gnadinger, Colorado Springs, CO (US);
Stefan Linder, Zofingen, CH;
Other;
Abstract
A radio frequency identification device (RFID) has an antenna formed on a chip. The chip has backside and a front side coated with conductive traces, which are connected through conductive traces on the sides of two elongate through-hole slots formed on the chip to form an operative coil having the chip as a core. In one embodiment, the antenna chip may be stacked above an integrated circuit. In another embodiment, the integrated circuit may be formed on the antenna chip. The antenna chip may include a high magnetic permeability layer to increase the inductance of the coil, a capacitor to tune the coil to a desired frequency, and a coupling capacitor to power the integrated circuit. As well as the specific application disclosed, an inductance useful in numerous applications can be formed according to the above structure.