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.
