Multiple-cavity antenna
First Claim
Patent Images
1. An apparatus comprising:
- an antenna with a connection port;
a load element;
wherein the antenna comprises a ribbon of conductive material;
wherein a first end of the ribbon and a second opposite end of the ribbon are folded over the middle part of the ribbon;
wherein the folded first and second ends of the ribbon are on the same side of the middle part of the ribbon;
wherein the folded first and second ends of the ribbon are parallel to the middle part of the ribbon;
wherein the folded first end of the ribbon is at a first distance from the middle part of the ribbon, and the folded second end of the ribbon is at a second distance from the middle part of the ribbon;
wherein the outline shape of the folded first end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon, and the outline shape of the folded second end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon;
wherein both the first distance and the second distance are less than(i) the length of the ribbon, and(ii) the width of the ribbon; and
wherein the folded first and second ends of the ribbon do not touch one another;
wherein the connection port comprises a first connection point on the first end of the ribbon and a second connection point on the second end of the ribbon; and
wherein the load element is electrically connected between the first connection point and the second connection point.
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Abstract
An antenna for a Radio-Frequency IDentification (RFID) system is disclosed that comprises a pair of resonant cavities. The antenna is realized by folding the ends of a ribbon of conductive material, such as metal foil, over the middle part of the ribbon. The antenna generates a higher voltage than prior-art antennas used in RFID systems, and it makes possible RFID systems with an improved range. In an alternative embodiment, the antenna comprises a reflector that enables the RFID system to better tolerate the presence of nearby metal objects.
42 Citations
27 Claims
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1. An apparatus comprising:
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an antenna with a connection port; a load element; wherein the antenna comprises a ribbon of conductive material; wherein a first end of the ribbon and a second opposite end of the ribbon are folded over the middle part of the ribbon; wherein the folded first and second ends of the ribbon are on the same side of the middle part of the ribbon; wherein the folded first and second ends of the ribbon are parallel to the middle part of the ribbon; wherein the folded first end of the ribbon is at a first distance from the middle part of the ribbon, and the folded second end of the ribbon is at a second distance from the middle part of the ribbon; wherein the outline shape of the folded first end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon, and the outline shape of the folded second end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon; wherein both the first distance and the second distance are less than (i) the length of the ribbon, and (ii) the width of the ribbon; and wherein the folded first and second ends of the ribbon do not touch one another; wherein the connection port comprises a first connection point on the first end of the ribbon and a second connection point on the second end of the ribbon; and wherein the load element is electrically connected between the first connection point and the second connection point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
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a ribbon of conductive foil; a load element; wherein a first end of the ribbon and a second opposite end of the ribbon are folded over the middle part of the ribbon; wherein the folded first and second ends of the ribbon are on the same side of the middle part of the ribbon; wherein the folded first and second ends of the ribbon are parallel to the middle part of the ribbon; wherein the folded first end of the ribbon is at a first distance from the middle part of the ribbon, and the folded second end of the ribbon is at a second distance from the middle part of the ribbon; wherein the outline shape of the folded first end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon, and the outline shape of the folded second end of the ribbon does not extend beyond the outline shape of the middle part of the ribbon; wherein the first distance is at least 3 mm and at most 10 mm, and the second distance is at least 3 mm and at most 10 mm; wherein the length of the ribbon is at least 200 mm and at most 300 mm; wherein the width of the ribbon is at least 6 mm; wherein the load element is electrically connected between the two folded ends of the ribbon through two ohmic electrical connections. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus comprising:
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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 and lies between the first plane and the second plane; a first electrical connection between a portion of the edge of the second sheet and the first sheet; a second electrical connection between a portion of the edge of the third sheet and the first sheet; and a connection port comprising a first connection point on the second sheet and a second connection point on the third sheet; wherein the second sheet does not overlap the third sheet; wherein the outline shape of the second sheet does not extend beyond the outline shape of the first sheet, and the outline shape of the third sheet does not extend beyond the outline shape of the first sheet; 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, (ii) the square root of the area of the second sheet, and (iii) the square root of the area of the third 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, (ii) the square root of the area of the second sheet, and (iii) the square root of the area of the third sheet; and wherein a load element is electrically connected between the first connection point and the second connection point. - View Dependent Claims (23, 24)
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25. An apparatus comprising:
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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 and lies between the first plane and the second plane; a fourth flat sheet of conductive material in a fourth plane that is parallel to the first plane; a first electrical connection between a portion of the edge of the second sheet and the first sheet; a second electrical connection between a portion of the edge of the third sheet and the first sheet; and a connection port comprising a first connection point on the second sheet and a second connection point on the third sheet; wherein the second sheet does not overlap the third sheet; wherein the outline shape of the second sheet does not extend beyond the outline shape of the first sheet, and the outline shape of the third sheet does not extend beyond the outline shape of the first sheet; 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, (ii) the square root of the area of the second sheet, and (iii) the square root of the area of the third 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, (ii) the square root of the area of the second sheet, and (iii) the square root of the area of the third sheet; and wherein the first plane is between the third plane and the fourth plane. - View Dependent Claims (26, 27)
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Specification