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:
Sep. 02, 2003
Filed:
Feb. 18, 2000
Jakob Ehrensvärd, Täby, SE;
Cypak AB, Täby, SE;
Abstract
A low-cost system for wireless, bi-directional transformation of electric signals over a capacitive interface between a host unit and a guest unit is provided. The system allows a high impedance in the circuitry of the guest unit to obtain a good signal transfer ability in conditions of poor dieelectric materials, poor conductivity in the contact pads and relatively large gaps between the contact pads. The capacitive interface comprises a respective first (A ; B ), second (A ; B ) and third (A ; B ) conductive area in the host and guest units ( ). The first conductive area (A ) of the host unit is connected to a self-tuning frequency generating resonant circuit ( ) in the host unit ( ) for obtaining high gain of signals transmitted to the guest unit ( ). The second and third conductive areas (A , A ) of the host unit are connected to an impedance circuit ( ) in the host unit for receiving signals from the guest unit. The first and second conductive areas (B , B ) of the guest unit are further connected to an impedance circuit ( ) in the guest unit for receiving signals from the host unit. In a preferred embodiment, the first and third conductive areas (B , B ) of the guest unit are also galvanically interconnected.