RFID tag using a surface insensitive antenna structure

Details RFID tag using a surface insensitive antenna structure RFID tag using a surface insensitive antenna structure

2005-07-05

2005-07-05

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S895000, C340S572700

Reexamination Certificate

active

06914562

ABSTRACT:
An antenna system that is insensitive to the surface on which it is mounted for use with a RFID tag having a wireless communication device, including a plurality of conductive tabs coupled to the wireless communication device for receiving and radiating radio frequency energy. At least two of the tabs are substantially identical in shape and coupled to the wireless communication device at feedpoint differing in location on each of the two tabs wherein the width of said at least two of said plurality of tabs taken transverse to the longitudinal centerline axis of each tab varies with distance along the longitudinal centerline axis of each of said tabs from its feedpoint. Alternatively, the wireless communication device is coupled to the tab at a feedpoint selected at a location differing on each of the tabs where the conducting area per unit length of the longitudinal centerline axis of each tab varies with distance along the longitudinal centerline axis of each of said tabs from its feedpoint. A radio frequency reflecting structure is coupled to the conductive tabs for reflecting radio frequency energy radiated therefrom. A dielectric material is located intermediate the conductive tabs and the radio frequency reflecting means.

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