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US 8,477,079 B2Granted
Multiple-cavity antenna
OwnerWilliam N. Carrinventor
Life of this patent
Estimating the term…
Abstract
An antenna for a Radio-Frequency IDentification (RFID) system is disclosed that comprises a resonant structure, an RFID load element, and a floating coupling element. One of the two terminals of the RFID load element is connected directly to the resonant structure, and the other terminal is connected to the floating coupling element. The floating coupling element is electrically isolated from the resonant structure; its presence provides an improved impedance match to the RFID load element.
Claims20
An antenna comprising:
- a first flat sheet of conductive material in a first plane;
- a second flat sheet of conductive material in a second plane that is parallel to the first plane;
- a third flat sheet of conductive material in a third plane that is parallel to the first plane;
- an electrical connection between a portion of the edge of the second sheet and the first sheet;
- a connection port comprising a first electrical connection point on the second sheet and a second electrical connection point on the third sheet;
- wherein the third sheet is electrically isolated from the first sheet;
- wherein the distance between the third plane and the first plane is at least one half of the distance between the second plane and the first plane;
- wherein the distance between the first plane and the second plane is less than:
- (i) the square root of the area of the first sheet, and
- (ii) the square root of the area of the second sheet;
- wherein the distance between the first plane and the third plane is less than:
- (i) the square root of the area of the first sheet, and
- (ii) the square root of the area of the third sheet.
10 more elements
An antenna comprising:
- a ribbon of conductive material;
- a patch of conductive material distinct from the ribbon of conductive material;
- wherein an end of the ribbon is folded over the middle part of the ribbon;
- wherein the patch of conductive material is positioned near the folded end of the ribbon, parallel to the middle part of the ribbon, without touching (i) the folded end of the ribbon, or (ii) the middle part of the ribbon;
- wherein the distance between the folded end of the ribbon and the middle part of the ribbon is less than:
- (i) the length of the ribbon, and
- (ii) the width of the ribbon;
- and
- wherein the distance between the patch of conductive material and the middle part of the ribbon is less than:
- (i) the length of the ribbon, and
- (ii) the width of the ribbon.
8 more elements
An apparatus comprising:
- an antenna with a connection port;
- a load element connected to the connection port;
- wherein the antenna comprises a ribbon of conductive material and, distinct from the ribbon of conductive material, a patch of conductive material;
- wherein an end of the ribbon is folded over the middle part of the ribbon;
- wherein the patch of conductive material is positioned next to the folded end of the ribbon, parallel to the middle part of the ribbon, without touching (i) the folded end of the ribbon, or (ii) the middle part of the ribbon;
- wherein the distance between the folded end of the ribbon and the middle part of the ribbon is less than:
- (i) the length of the ribbon, and
- (ii) the width of the ribbon;
- wherein the distance between the patch of conductive material and the middle part of the ribbon is less than:
- (i) the length of the ribbon, and
- (ii) the width of the ribbon;
- wherein the connection port comprises a first electrical connection point on the folded end of the ribbon and a second electrical connection point on the patch of conductive material;
- wherein the load element is electrically connected between the first electrical connection point and the second electrical connection point.
10 more elements
Dependencies are inferred from the claim text.