Radio Frequency Identification Device and Method for Increasing Tag Activation Distance

Patent Number 6825754
Issue Date 2004 11 30
Assignee Motorola, Inc.
Inventor(s) Rolin, John Howard
State/Country CA

Title: Radio frequency identification device for increasing tag activation distance and method thereof

Abstract: A radio frequency identification ("RFID") device for increasing tag activation distance comprises a first exciter electrode (2), a second exciter electrode (21), a dielectric substrate (3), and a first exciter voltage source (4). The second exciter electrode is positioned behind the first exciter electrode. The dielectric substrate is disposed between the first and second exciter electrodes. The dielectric substrate isolates the first exciter electrode from the second exciter electrode. The first exciter voltage source is coupled to at least one of the first exciter electrode and the second exciter electrode. Exmp. Claim 1 Ex Claim text A radio frequency identification ("RFID") reader for increasing tag activation distance, the RFID reader comprising: at least a first exciter electrode and a second exciter electrode, the second exciter electrode positioned behind the first exciter electrode; a dielectric substrate disposed between the first and second exciter electrodes, and isolating the first exciter electrode from the second exciter electrode; and a first exciter voltage source coupled to at least one of the first exciter electrode and the second exciter electrode for generating an electric field that radiates in a front portion of the RFID reader.