RFID tag using a surface insensitive antenna structure
First Claim
1. An antenna system for use with a wireless communication device, comprising:
- A plurality of conductive tabs coupled to said wireless communication device for receiving and radiating radio frequency energy, at least two of said plurality of tabs each coupled to said wireless communication device at a feedpoint differing in location on each of said two tabs and 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;
Radio frequency reflecting means coupled to said plurality of conductive tabs for reflecting radio frequency energy radiated therefrom; and
A dielectric intermediate said conductive tabs and said radio frequency reflecting means.
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Accused Products
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.
130 Citations
89 Claims
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1. An antenna system for use with a wireless communication device, comprising:
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A plurality of conductive tabs coupled to said wireless communication device for receiving and radiating radio frequency energy, at least two of said plurality of tabs each coupled to said wireless communication device at a feedpoint differing in location on each of said two tabs and 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;
Radio frequency reflecting means coupled to said plurality of conductive tabs for reflecting radio frequency energy radiated therefrom; and
A dielectric intermediate said conductive tabs and said radio frequency reflecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An antenna system for use with a wireless communication device, comprising:
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A plurality of conductive tabs coupled to said wireless communication device for receiving and radiating radio frequency energy, at least two of said plurality of tabs, each being substantially identical in shape and conducting area, and further including at least one non-conducting area, are each coupled to said wireless communication device at a feedpoint differing in location on each of said two tabs and 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 feed point;
Radio frequency reflecting means coupled to said plurality of conductive tabs for reflecting radio frequency energy radiated therefrom; and
,A dielectric intermediate said conductive tabs and said radio frequency reflecting means. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. An antenna system for use with a wireless communication device, comprising:
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A plurality of conductive tabs coupled to said wireless communication device for receiving and radiating radio frequency energy, at least two of said plurality of tabs each coupled to said wireless communication device at a feedpoint differing in location on each of said two tabs and wherein 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;
Radio frequency reflecting means coupled to said plurality of conductive tabs for reflecting radio frequency energy radiated therefrom; and
,A dielectric intermediate said conductive tabs and said radio frequency reflecting means. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A radio frequency identification (RFID) device that includes
a wireless communication device; -
a pair of conductive tabs coupled to the wireless communication device at respective feedpoints;
planar conductive material operatively coupled to the conductive tabs to reflect radio energy from the tabs; and
a dielectric material between the conductive tabs and the planar conductive material;
wherein width profiles of the tabs vary with distance from one another, wherein the width profiles are taken beginning at the feedpoints in directions away from the wireless communication device, and are taken transverse to respective longitudinal centerline axes of the tabs. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89)
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Specification