Patent ID: 6615023
Filing Date: 2003-09-02
Classification: G08C,H01F

Abstract:
A system for wireless, bi-directional transfer of electric signals over a capacitive interface formed between electric circuitry contained partly in a host unit and partly in a guest unit when the units are placed in a proximity relationship;said capacitive interface comprising a respective first (A1; B1), second (A2; B2) and third (A3; B3) conductive area in the host and guest units (10,40); said first conductive area (A1) of the host unit being connected to a frequency generating resonant circuit (16) in the host unit (10) for transmitting signals to the guest unit (40); said second and third conductive areas (A2, A3) of the host unit being connected to an impedance circuit (30) in the host unit for receiving signals from the guest unit; said first and second conductive areas (B1, B2) of the guest unit being connected to an impedance circuit (44) in the guest unit for receiving signals from the host unit; and said first and third conductive areas (B1, B3) of the guest unit being interconnected.