RFID tag and RFID tag bag body

Abstract

The utility model discloses an RFID (Radio Frequency Identification Device) tag and an RFID tag bag body. An RFID tag comprises a coupling antenna, a grounding antenna, a signal source structure, a connecting line segment, a bending antenna and a carrier. The coupling antenna comprises a conduction section and a coupling section. The conductive section extends in a first direction. The coupling section extends from one end of the conduction section to the second direction. The grounding antenna and the coupling section are parallel and spaced at an interval. The signal source structure comprises an RFID chip and a circulating antenna, the RFID chip is electrically connected with the circulating antenna, and the signal source structure and the coupling section are located on the same side of the conduction section. One end of the connecting line segment is connected with the circulating antenna, and the other end of the connecting line segment is connected with the conduction segment. And the bent antenna extends out from the other end of the conduction section. The carrier carries the coupling antenna, the signal source structure, the connecting line segment, the grounding antenna and the bending antenna. The utility model also discloses an RFID label bag body. The RFID tag can be used on an antistatic bag or a bag body containing metal, and has better identification rate, economic benefit and convenience.

Description

Technical Field

[0001] The utility model relates to the field of product identification, in particular to an RFID tag and an RFID tag bag body. Background Art

[0002] Many commodities need to be packaged with antistatic bags or bags containing metals. For example, high-precision electronic products are usually packaged with antistatic bags or bags with metal interlayers to avoid damage to the electronic products due to electrostatic discharge. In addition, for foods or medicines that need moisture-proof or fresh-keeping, packaging bags containing metals such as aluminum foil bags are also often used for packaging.

[0003] With the progress of technology, radio frequency identification (RFID) tags are widely used in, for example, production history and warehouse management. However, generally, if the RFID tag is attached to the surface of an antistatic bag or a bag containing metal, interference may occur, resulting in the RFID tag being unable to be effectively identified and read. In the prior art, the metal-resistant RFID tags are not only expensive but also large in size. In addition, the existing metal-resistant RFID tags often have problems of being difficult to fix or falling off in practical applications.

[0004] Therefore, there is an urgent need for a more convenient, more cost-effective, and more effective RFID tag technology to improve the disadvantages of the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an RFID tag and an RFID tag bag body. This RFID tag can be used on an antistatic bag or a bag containing metal, and has better recognition rate, economic efficiency, and convenience.

[0006] To achieve the above purpose, an RFID tag includes:

[0007] A coupling antenna, including:

[0008] A conduction segment extending in a first direction; and

[0009] A coupling segment extending from one end of the conduction segment in a second direction, where the second direction is not parallel to the first direction;

[0010] A ground antenna parallel to the coupling segment, and the ground antenna is spaced from the coupling segment by a distance. The ground antenna and the conduction segment are respectively located on opposite sides of the coupling segment, and the width of the ground antenna is greater than the width of the coupling segment;

[0011] A signal source structure, including an RFID chip and a loop antenna. The RFID chip is electrically connected to the loop antenna, and the signal source structure and the coupling segment are located on the same side of the conduction segment;

[0012] A connecting line segment, one end of the connecting line segment is physically connected to the loop antenna, and the other end of the connecting line segment is physically connected to the conductive segment;

[0013] A bent antenna, extending from the other end of the conductive segment; and

[0014] A carrier, carrying the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna.

[0015] In some embodiments, the RFID tag further includes another carrier, the other carrier and the carrier are respectively located on opposite sides of the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna, and the other carrier and the carrier jointly cover the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna.

[0016] In some embodiments, the width of the ground antenna is greater than the spacing between the ground antenna and the coupling segment, the spacing between the ground antenna and the coupling segment is less than the spacing between the loop antenna and the coupling segment, and the spacing between the ground antenna and the coupling segment is less than the width of the connecting line segment.

[0017] In some embodiments, the width of the connecting line segment is less than the width of the conductive segment, and the width of the connecting line segment is less than or substantially equal to the width of the coupling segment.

[0018] In some embodiments, the bent antenna includes a sequentially connected extension segment, a first short line segment, a first long line segment, a second short line segment and a second long line segment, and

[0019] The extension segment extends from the other end of the conductive segment, and the extension segment and the coupling segment are located on the same side of the conductive segment, and

[0020] The first short line segment extends from the end of the extension segment, the first short line segment and the second short line segment are substantially parallel to the conductive segment, and the first long line segment and the second long line segment are substantially parallel to the coupling segment.

[0021] In some embodiments, the width of the first short line segment is greater than the width of the first long line segment, the width of the first long line segment is greater than the width of the second short line segment, and the first long line segment, the second long line segment and the extension segment have substantially the same width.

[0022] In some embodiments, the bent antenna has a characteristic length defined as the sum of the width of the first short segment, the length of the first long segment, and the width of the second short segment; wherein the characteristic length is substantially equal to the sum of the width of the second short segment and the length of the second long segment; wherein the characteristic length is less than the length of the coupling segment, the length of the extension segment, or the length of the ground antenna; and the characteristic length is greater than the length of the loop antenna.

[0023] In some embodiments, an open end of the coupling segment and the end of the extension segment form a clearance area having a length, and the length of the clearance area is greater than the width of the loop antenna.

[0024] In some embodiments, the length of the coupling segment and the length of the extension segment are greater than the length of the conductive segment.

[0025] In some embodiments, the width of the coupling segment is less than the width of the extension segment, and the length of the coupling segment is substantially equal to the length of the extension segment.

[0026] In some embodiments, the bent antenna includes an extension segment, a first horizontal segment, a first vertical segment, a second horizontal segment, a second vertical segment, and a third horizontal segment connected in sequence, and wherein

[0027] the extension segment extends from the other end of the conductive segment, and the extension segment and the coupling segment are on the same side of the conductive segment, and

[0028] the first horizontal segment extends from the end of the extension segment, the first horizontal segment, the second horizontal segment, and the third horizontal segment are substantially parallel to the conductive segment, and the first vertical segment and the second vertical segment are substantially parallel to the coupling segment.

[0029] In some embodiments, the first horizontal segment, the first vertical segment, the second horizontal segment, the second vertical segment, the third horizontal segment, and the extension segment have substantially the same width.

[0030] In some embodiments, the spacing between the loop antenna and the coupling segment is less than the spacing between the loop antenna and the extension segment.

[0031] In some embodiments, the spacing between the loop antenna and the extension segment is 1.2 to 2 times the spacing between the loop antenna and the coupling segment.

[0032] In some embodiments, the spacing between the connecting line segment and the coupling segment is less than the spacing between the connecting line segment and the extending segment.

[0033] In some embodiments, the folded antenna includes an extending segment, a fourth horizontal segment, a fourth vertical segment, a fifth horizontal segment, and a fifth vertical segment connected in sequence, and

[0034] the extending segment extends from the other end of the conductive segment, the fourth horizontal segment and the fifth horizontal segment are substantially parallel to the conductive segment, and the extending segment, the fourth vertical segment, and the fifth vertical segment are substantially parallel to the coupling segment.

[0035] In some embodiments, the spacing between the loop antenna and the coupling segment is less than the spacing between the fifth vertical segment and the loop antenna.

[0036] In some embodiments, the width of the ground antenna is greater than the width of the extending segment, and the width of the extending segment is greater than the width of the coupling segment.

[0037] In some embodiments, the ground antenna has a slit.

[0038] In some embodiments, the width of the slit is substantially equal to the spacing between the ground antenna and the coupling segment.

[0039] In some embodiments, a bag body with an RFID tag includes:

[0040] a bag body including at least one of a metal layer and an antistatic layer; and

[0041] the RFID tag as described in any of the above embodiments, at least a part of the ground antenna of the RFID tag overlaps with at least one of the metal layer and the antistatic layer. Description of the Drawings

[0042] Figure 1 A top view schematic diagram of an RFID tag in certain embodiments.

[0043] Figure 2 A top view schematic diagram of an RFID tag in certain embodiments.

[0044] Figure 3 A top view schematic diagram of an RFID tag in certain embodiments.

[0045] Figure 4 A top view schematic diagram of an RFID tag in certain embodiments.

[0046] Figure 5 A top view schematic diagram of an RFID tag in certain embodiments.

[0047] Figure 6 It is a top view schematic diagram of an RFID tag in some embodiments.

[0048] Figure 7 It is a three-dimensional schematic diagram of an RFID tag bag body in some embodiments.

[0049] Description of main reference numerals: 10a, 10b, 10c, 10d, 10e, 10f: RFID tag

[0050] 20: RFID tag bag body

[0051] 30: Metal plate

[0052] 100: Coupling antenna

[0053] 102: Conductive section

[0054] 102a, 102b: Opposite ends of the conductive section

[0055] 110: Coupling section

[0056] 112: Open end

[0057] 130: Clearance area

[0058] 200: Signal source structure

[0059] 210: RFID chip

[0060] 220: Loop antenna

[0061] 300: Connecting line segment

[0062] 400, 400d, 400e, 400f: Ground antenna

[0063] 410d, 410e, 410f: Slit

[0064] 500, 500a, 500b: Bent antenna

[0065] 505: Extension segment

[0066] 506: End

[0067] 510: First short line segment

[0068] 520: First long line segment

[0069] 530: Second short line segment

[0070] 540: Second long line segment

[0071] 550: First horizontal segment

[0072] 560: First vertical segment

[0073] 570: Second horizontal segment

[0074] 580: Second vertical segment

[0075] 590: Third horizontal segment

[0076] 600: Carrier

[0077] 700: Bag body

[0078] 710: Metal layer

[0079] 720: Antistatic layer

[0080] 810: Extension segment

[0081] 820: Fourth horizontal segment

[0082] 830: Fourth vertical segment

[0083] 840: Fifth horizontal segment

[0084] 850: Fifth vertical segment

[0085] 102L, 110L, 130W, 220L, 400L, 505L, 520L, 540L: Length

[0086] 102W, 110W, 220W, 300W, 400W, 505W, 510W, 520W, 530W, 540W, 550W, 570W, 810W, 820W, 830W, 840W, 850W, G6: Width

[0087] D1: First direction

[0088] D2: Second direction

[0089] G1, G2, G3, G4, G5, G7, G8, G9: Spacing

[0090] Y: Characteristic length Detailed implementation manners

[0091] Please refer to Figure 1 , the RFID tag 10a includes a coupling antenna 100, a signal source structure 200, a connection line segment 300, a ground antenna 400, a bent antenna 500 and a carrier 600, wherein the approximate positions of the coupling antenna 100 and the bent antenna 500 are marked with "dotted boxes".

[0092] The coupled antenna 100 includes a conductive section 102 and a coupling section 110. The conductive section 102 extends in a first direction D1, and the coupling section 110 extends from one end of the conductive section 102 in a second direction D2, where the second direction D2 is not parallel to the first direction D1. Specifically, the conductive section 102 has opposite end portions 102a and 102b. One end of the coupling section 110 is connected to the end portion 102a of the conductive section 102, but the other end of the coupling section 110 is an open end 112. In some embodiments, the first direction D1 is substantially perpendicular to the second direction D2, and the external contour of the coupled antenna 100 is similar to an "L" shape. However, in other embodiments, the first direction D1 is not perpendicular to the second direction D2.

[0093] The bent antenna 500 extends from the other end portion 102b of the conductive section 102 in the second direction D2. In some embodiments, the bent antenna 500 includes an extension section 505, a first short line segment 510, a first long line segment 520, a second short line segment 530, and a second long line segment 540 connected in sequence. The extension section 505 extends from the end portion 102b of the conductive section 102 in the second direction D2, and the extension section 505 and the coupling section 110 of the coupled antenna 100 are on the same side of the conductive section 102. The first short line segment 510 extends from the end 506 of the extension section 505 in the first direction D1. In some embodiments, the first short line segment 510 and the second short line segment 530 are substantially parallel to the conductive section 102, and the first long line segment 520 and the second long line segment 540 are substantially parallel to the coupling section 110.

[0094] In some embodiments, the width 510W of the first short line segment 510 is greater than the width 520W of the first long line segment 520, and the width 520W of the first long line segment 520 is greater than the width 530W of the second short line segment 530; that is, the width 510W of the first short line segment 510 is greater than the width 530W of the second short line segment 530. In multiple embodiments, when the RFID tag is applied to a metal or antistatic bag, the feature that the width 510W of the first short line segment 510 is greater than the width 530W of the second short line segment 530 helps to improve the recognition rate and / or the recognizable distance of the RFID tag 10a. In some embodiments, the width 520W of the first long line segment 520, the width 540W of the second long line segment 540, and the width 505W of the extension section 505 are substantially equal.

[0095] In some embodiments, the bent antenna 500 has a characteristic length Y, which is defined as the sum of the width 510W of the first short segment 510, the length 520L of the first long segment 520, and the width 530W of the second short segment 530. The above-mentioned characteristic length Y is substantially equal to the sum of the width 530W of the second short segment 530 and the length 540L of the second long segment 540. In addition, the characteristic length Y is less than the length 110L of the coupling segment 110 of the coupling antenna 100, the length 505L of the extension segment 505, or the length 400L of the ground antenna 400. In some embodiments, the characteristic length Y of the bent antenna 500 is greater than the length 220L of the loop antenna 220.

[0096] In some embodiments, the coupling segment 110 extends substantially parallel to the extension segment 505. In some other embodiments, the width 110W of the coupling segment 110 is less than the width 505W of the extension segment 505, the width 520W of the first long segment 520, or the width 540W of the second long segment 540. In some further embodiments, the length 110L of the coupling segment 110 is substantially equal to the length 505L of the extension segment 505.

[0097] In some embodiments, a clearance area 130 (such as the elliptical dotted box in Figure 1 ) is formed between the open end 112 of the coupling segment 110 and the end 506 of the extension segment 505, and there is no any antenna structure in the clearance area 130. In some embodiments, the length 130W of the clearance area 130 is substantially equal to the length 102L of the conduction segment 102. In some embodiments, the length direction of the clearance area 130 is parallel to the first direction D1, and the length direction of the clearance area 130 is substantially perpendicular to the second direction D2. In some embodiments, the extension segment 505 and the coupling segment 110 are substantially perpendicular to the conduction segment 102. In some further embodiments, the length 110L of the coupling segment 110 and the length 505L of the extension segment 505 are greater than the length 102L of the conduction segment 102.

[0098] The signal source structure 200 includes an RFID chip 210 and a loop antenna 220, and the RFID chip 210 is electrically connected to the loop antenna 220. Specifically, the length 130W of the clearance area 130 is greater than the width 220W of the loop antenna 220; the length 110L of the coupling section 110 of the coupling antenna 100 is greater than the length 220L of the loop antenna 220. In some embodiments, the spacing G2 between the loop antenna 220 and the coupling section 110 is less than the spacing G3 between the loop antenna 220 and the extension section 505. In some embodiments, the ratio (G3 / G2) of the spacing G3 to the spacing G2 is from about 1.2 to about 2, such as about 1.2, about 1.3, about 1.4, about 1.5, about 1.6, about 1.7, about 1.8, about 1.9, or about 2. In multiple embodiments, the feature that the above-mentioned spacing G2 is less than the spacing G3 provides beneficial technical effects. When the RFID tag 10a is applied to a metal or antistatic bag, the technical feature that the spacing G2 is less than the spacing G3 is beneficial to improving the recognition rate and / or the recognizable distance of the RFID tag.

[0099] One end of the connection line segment 300 is connected to the loop antenna 220, and the other end of the connection line segment 300 is connected to the conduction section 102 of the coupling antenna 100. In some embodiments, the spacing G4 between the connection line segment 300 and the coupling section 110 is less than the spacing G5 between the connection line segment 300 and the extension section 505. In multiple embodiments, when the RFID tag 10a is applied to a metal or antistatic bag, the technical feature that the spacing G4 is less than the spacing G5 helps to improve the recognition rate and / or the recognizable distance of the RFID tag. In some embodiments, the connection line segment 300 is substantially parallel to the coupling section 110. In still some other embodiments, the width 300W of the connection line segment 300 is less than the width 102W of the conduction section 102 of the coupling antenna 100. In some other embodiments, the width 300W of the connection line segment 300 is less than or equal to the width 110W of the coupling section 110.

[0100] The ground antenna 400 is disposed on one side of the coupling section 110 of the coupling antenna 100, and there is a spacing G1 between the ground antenna 400 and the coupling section 110. Note that there is no conductive body connecting the ground antenna 400 and the coupling antenna 100 physically. In addition, the ground antenna 400 and the conduction section 102 are respectively located on opposite sides of the coupling section 110. In some embodiments, the width 400W of the ground antenna 400 is greater than the width 110W of the coupling section 110. In some embodiments, the width 400W of the ground antenna 400 is greater than the spacing G1 between the ground antenna 400 and the coupling section 110. In still other embodiments, the width 400W of the ground antenna 400 is greater than the width 505W of the extension section 505, and the width 505W of the extension section 505 is greater than the width 110W of the coupling section 110. In other embodiments, the ground antenna 400 is substantially parallel to the coupling section 110. In still other embodiments, the width 110W of the coupling section 110 is greater than the spacing G1 between the ground antenna 400 and the coupling section 110. In some embodiments, the width 400W of the ground antenna 400 is greater than the maximum width in the bent antenna 500. In some embodiments, the length 400L of the ground antenna 400 is substantially equal to the length 110L of the coupling section 110 of the coupling antenna 100. In some embodiments, the spacing G1 between the ground antenna 400 and the coupling section 110 is less than the spacing G2 between the loop antenna 220 and the coupling section 110. In other embodiments, the spacing G1 between the ground antenna 400 and the coupling section 110 is substantially less than or substantially equal to the width 300W of the connection line segment 300.

[0101] According to multiple embodiments of the present invention, the spacing G1 between the ground antenna 400 and the coupling section 110 of the coupling antenna 100 causes a capacitive coupling effect between the ground antenna 400 and the coupling antenna 100, which helps to improve the receiving and / or transmitting effect of the overall antenna. For example, when the RFID tag 10a is applied to a metal bag. Moreover, the loop antenna 220 is connected to the coupling antenna 100 via the connection line segment 300, which also helps the receiving and / or transmitting effect of the entire RFID tag 10a. In some embodiments, the coupling antenna 100, the loop antenna 220, the connection line segment 300, the ground antenna 400, and the bent antenna 500 described in any of the embodiments herein are made of conductive metal, such as copper, silver, aluminum, or similar materials.

[0102] The features and elements in any embodiment of the various elements described herein can be combined with each other where beneficial. For example, the features of any embodiment described above regarding the bent antenna 500 can be combined with other features of the bent antenna 500. For example, the characteristic length Y of the bent antenna 500 can be combined with the following features of the bent antenna 500 described above: "the widths 520W of the first long line segment 520, the widths 540W of the second long line segment 540, and the width 505W of the extension segment 505 are substantially equal", to obtain additional embodiments.

[0103] The carrier 600 is used to carry the coupled antenna 100, the signal source structure 200, the connecting line segment 300, the ground antenna 400, and the bent antenna 500. The carrier 600 can be, for example, paper, a polymer, or other suitable substrates or objects. The above polymer substrates are, for example, polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyurethane (PU), oriented polypropylene (OPP), or similar materials.

[0104] In some embodiments, a first coating layer and a second coating layer (not shown) are respectively disposed on the upper and lower surfaces of the RFID tag 10a. The first coating layer and the second coating layer jointly enclose the RFID tag 10a therein to protect the RFID tag 10a. In some embodiments, the first coating layer and the second coating layer have the functions of waterproofing and moisture resistance. The materials of the first coating layer and the second coating layer are, for example, polymers, paper, fabrics, or non-woven fabrics, etc. The polymer materials of the above coating layers can be similar to the polymer materials used for the above carrier 600. In other embodiments, the RFID tag 10a further includes another carrier, and the other carrier (not shown) and the carrier 600 are respectively located on opposite sides of the coupled antenna, the signal source structure, the connecting line segment, the ground antenna, and the bent antenna, and the other carrier and the carrier 600 jointly enclose the coupled antenna, the signal source structure, the connecting line segment, the ground antenna, and the bent antenna.

[0105] Please refer to Figure 2 , the RFID tag 10b is similar to the RFID tag 10a described above regarding Figure 1 . The embodiments of the coupled antenna 100, the signal source structure 200, the connecting line segment 300, the ground antenna 400, and the carrier 600 of the RFID tag 10b can be, for example, those described above regarding Figure 1The embodiments described above. The bent antenna 500a of the RFID tag 10b includes an extension segment 505, a first horizontal segment 550, a first vertical segment 560, a second horizontal segment 570, a second vertical segment 580, and a third horizontal segment 590 that are connected in sequence. The extension segment 505 extends from the end 102b of the conductive segment 102 in the second direction D2, and the extension segment 505 and the coupling segment 110 of the coupling antenna 100 are located on the same side of the conductive segment 102. The first horizontal segment 550 extends from the end 506 of the extension segment 505 in the first direction D1. In some embodiments, the first horizontal segment 550, the second horizontal segment 570, and the third horizontal segment 590 are substantially parallel to the conductive segment 102, and the first vertical segment 560 and the second vertical segment 580 are substantially parallel to the coupling segment 110. In some embodiments, the first horizontal segment 550, the first vertical segment 560, the second horizontal segment 570, the second vertical segment 580, the third horizontal segment 590, and the extension segment 505 have substantially the same width. However, in other embodiments, the width 550W of the first horizontal segment 550 is greater than the width 570W of the second horizontal segment 570. In some embodiments, the width 400W of the ground antenna 400 is greater than the width 505W of the extension segment 505, and the width 505W of the extension segment 505 is greater than the width 110W of the coupling segment 110. In some embodiments, the spacing G2 between the loop antenna 220 and the coupling segment 110 is less than the spacing G3 between the loop antenna 220 and the extension segment 505. In some embodiments, the spacing G2 between the loop antenna 220 and the coupling segment 110 is less than the spacing G3 between the loop antenna 220 and the extension segment 505. In some embodiments, the ratio (G3 / G2) of the spacing G3 to the spacing G2 is about 1.2 to about 2, such as about 1.2, about 1.3, about 1.4, about 1.5, about 1.6, about 1.7, about 1.8, about 1.9, or about 2. In multiple embodiments, the feature that the above spacing G2 is less than the spacing G3 provides beneficial technical effects. When the RFID tag 10a is applied to a metal or antistatic bag, the technical feature that the spacing G2 is less than the spacing G3 is beneficial to improving the recognition rate and / or the recognizable distance of the RFID tag. In some embodiments, the spacing G4 between the connection line segment 300 and the coupling segment 110 is less than the spacing G5 between the connection line segment 300 and the extension segment 505.

[0106] Please refer to Figure 3 , the RFID tag 10c is similar to the RFID tag 10a described above with respect to Figure 1 The embodiments described above. Briefly, the signal source structure 200, the connection line segment 300, the ground antenna 400, and the carrier 600 of the RFID tag 10c can be, for example, the embodiments described above with respect to Figure 1 The embodiments described above. In Figure 3In the illustrated RFID tag 10c, the coupling antenna 100 includes a conductive section 102 and a coupling section 110. The length 102L of the conductive section 102 is about 2 to about 4 times the width 220W of the loop antenna 220, such as about 2 times, about 2.3 times, about 2.7 times, about 3 times, about 3.5 times, or about 4 times. The bent antenna 500b of the RFID tag 10c extends from the end 102b of the conductive section 102 in the second direction D2, and the bent antenna 500b and the coupling section 110 are on the same side of the conductive section 102. The bent antenna 500b includes an extension section 810, a fourth horizontal section 820, a fourth vertical section 830, a fifth horizontal section 840, and a fifth vertical section 850 connected in sequence. The extension section 810 extends from the end 102b of the conductive section 102 in the second direction D2. The fourth horizontal section 820 and the fifth horizontal section 840 are substantially parallel to the conductive section 102, and the extension section 810, the fourth vertical section 830, and the fifth vertical section 850 are substantially parallel to the coupling section 110. In some embodiments, the spacing G2 between the loop antenna 220 and the coupling section 110 is less than the spacing G7 between the fifth vertical section 850 and the loop antenna 220. In some embodiments, the ratio (G7 / G2) of the spacing G7 to the spacing G2 is about 1.2 to about 2, such as about 1.2, about 1.3, about 1.4, about 1.5, about 1.6, about 1.7, about 1.8, about 1.9, or about 2. In multiple embodiments, the feature that the above-mentioned spacing G2 is less than the spacing G7 provides beneficial technical effects. When the RFID tag 10a is applied to a metal or antistatic bag, the technical feature that the spacing G2 is less than the spacing G7 is beneficial to improving the recognition rate and / or the recognizable distance of the RFID tag. In some other embodiments, the spacing G8 between the connecting line segment 300 and the fifth vertical section 850 is greater than the spacing G9 between the connecting line segment 300 and the coupling section 110. In some embodiments, the width 820W of the fourth horizontal section 820 is greater than the width 810W of the extension section 810 and the width 830W of the fourth vertical section 830. In some other embodiments, the width 820W of the fourth horizontal section 820 is greater than the width 840W of the fifth horizontal section 840. In some embodiments, the width 850W of the fifth vertical section 850 is less than the width 810W of the extension section 810 and the width 830W of the fourth vertical section 830. In some other embodiments, the width 400W of the ground antenna 400 is greater than the width 810W of the extension section 810, and the width 810W of the extension section 810 is greater than the width 110W of the coupling section 110.

[0107] Please refer to Figure 4 , Figure 5 and Figure 6 , RFID tags 10d, 10e, and 10f are respectively illustrated as being similar to Figure 1 , Figure 2 and Figure 3The RFID tags 10a, 10b, and 10c are different in that the ground antennas 400d, 400e, and 400f of the RFID tags 10d, 10e, and 10f respectively have hollowed-out slits 410d, 410e, and 410f. In some embodiments, the length directions of the slits 410d, 410e, and 410f are parallel to the second direction D2. In some embodiments, the width G6 of the slits 410d, 410e, and 410f is substantially equal to the spacing G1 between the ground antenna 400 and the coupling section 110. Although Figures 4 to 6 only one slit is shown, in other embodiments, the ground antennas 400d, 400e, and 400f may each have two or more slits. In addition, although Figures 4 to 6 the slits 410d, 410e, and 410f are shown with a straight and long profile, in other embodiments, the slits may have a profile similar to "ㄑ", a profile similar to "Z", a profile similar to "ㄣ", or other shapes. The various features described in the various embodiments may, alone or in combination of two or more features, achieve improving the recognition rate, the recognizable distance, adjusting the optimal operating frequency, and / or being applicable to applications in metal bags.

[0108] Please refer to Figure 7 , the RFID tag bag 20 includes a bag body 700 and an RFID tag 10a. The RFID tag described in any of the previous embodiments can be used to replace the RFID tag 10a. The bag body 700 may include a metal layer 710 and / or an antistatic layer 720. In some embodiments, the RFID tag 10a may be located in the interlayer of the bag body 700. In some embodiments, the RFID tag 10a may be located on the outer surface of the bag body 700. In the above embodiments, it is characterized in that the ground antenna 400 overlaps with the metal layer 710 and / or the antistatic layer 720 of the bag body 700, but other parts of the RFID tag 10a, such as the coupling antenna 100, the signal source structure 200, the connection line segment 300, and the bent antenna 500, are located outside the bag body 700. The method of overlapping the RFID tag 10a with the bag body 700 may be, for example, ultrasonic welding, heat sealing, hot pressing, adhesion, or stitching.

[0109] The sensitivity test of the antenna structure of the HFSS computer simulation was carried out on the RFID tag 10a and the RFID tag 10d (i.e., the ground antenna 400d has a hollowed-out slit 410d structure) in the state of no attached article and in a vacuum state. The results show that the optimal operating frequency of the RFID tag 10a is about 1030 MHz, while the optimal operating frequency of the RFID tag 10d is about 960 MHz. Comparing the above two structures and results, it can be seen that adding a slit in the ground antenna can effectively adjust the operating frequency of the RFID tag.

[0110] All the RFID tags 10a are attached to a larger metal plate, i.e., the RFID tags 10a are completely overlapped with the larger metal plate, and the sensitivity test of the antenna structure is carried out by HFSS computer simulation. The results show that the RFID tags 10a completely lose their functions and cannot operate normally. In addition, the RFID tags 10a and 10d (i.e., the ground antenna 400d has a slotted structure 410d) are partially attached to the metal plate, that is, only the ground antenna 400 or 400d is partially overlapped with the metal plate respectively, and the sensitivity test of the antenna structure is carried out by HFSS computer simulation. The results show that both the RFID tags 10a and 10d can function normally; the optimal operating frequency of the RFID tag 10a is about 948 MHz, and this optimal operating frequency is already close to the US frequency band (902 - 928 MHz); while the optimal operating frequency of the RFID tag 10d with a slotted structure is about 840 MHz, and this optimal operating frequency is close to the EU frequency band (865 - 868 MHz). Therefore, from the simulation test results, it can be seen that the slotted structure causes the optimal operating frequency to shift towards a lower frequency, indicating that the RFID tag 10a is suitable for US products, while the RFID tag 10d with a slotted structure is suitable for EU products.

[0111] The RFID tags 10b and 10e (i.e., the ground antenna 400e has a slotted structure 410e) are partially attached to the metal plate, that is, only the ground antenna 400 or 400e is partially overlapped with the metal plate respectively, and the sensitivity test of the antenna structure is carried out by HFSS computer simulation. The results show that both the RFID tags 10b and 10e can function normally; the optimal operating frequency of the RFID tag 10b is about 1025 MHz. Although the optimal operating frequency slightly deviates from the US frequency band, it can still function normally; while for the RFID tag 10e with a slotted structure, the optimal operating frequency is about 970 MHz, and this optimal operating frequency is already close to the standard frequency band of US specifications. Therefore, from the simulation test results, it can be seen that the slotted structure causes the optimal operating frequency to shift towards a lower frequency, indicating that the RFID tag 10e with a slotted structure is more suitable for US products. In addition, the difference between the RFID tags 10a and 10b lies in the configuration design of the bent antenna, and the difference between the RFID tags 10b and 10e lies in the slotted structure. The simulation test results of the three when partially attached to the metal plate show that although the optimal operating frequency of the RFID tag 10b shifts towards a higher frequency compared to the RFID tag 10a, the RFID tag 10e with a slotted structure can bring the optimal operating frequency closer to the lower US frequency band. This result shows that although the configuration design of the bent antenna affects the optimal operating frequency, the optimal operating frequency can also be improved by the slotted structure of the ground antenna, and thus it is suitable for different products.

[0112] The RFID tag 10c and the RFID tag 10f (i.e., the ground antenna 400f has a slotted structure with a cutout 410f) are partially attached to a metal plate, that is, only the ground antenna 400 or the ground antenna 400f is respectively partially overlapped with the metal plate, and the sensitivity test of the antenna structure is carried out by HFSS computer simulation. The results show that both the RFID tag 10c and the RFID tag 10f can function normally; the optimal operating frequency of the RFID tag 10c is about 985 MHz. Although the optimal operating frequency slightly deviates from the US band, it can still function normally; for the RFID tag 10f with a slit structure, the optimal operating frequency is about 970 MHz, and this optimal operating frequency is already close to the US band. Therefore, from the simulation test results, it can be seen that the slit structure causes the optimal operating frequency to shift towards the lower frequency direction, indicating that the RFID tag 10f with a slit structure is more suitable for US products. In addition, the difference between the RFID tag 10a and the RFID tag 10c lies in the configuration design of the bent antenna, and the difference between the RFID tag 10c and the RFID tag 10f lies in the slit structure. The simulation test results of the three when partially attached to the metal plate show that although the optimal operating frequency of the RFID tag 10c is shifted towards the higher frequency direction compared to the RFID tag 10a, the RFID tag 10f with a slit structure can bring the optimal operating frequency closer to the lower frequency US band. This result shows that although the configuration design of the bent antenna affects the optimal operating frequency, the optimal operating frequency can also be improved by means of the slit structure of the ground antenna, and thus it is applicable to different products.

[0113] The present utility model does not intend to be restricted by any theory. However, based on the above simulation results, although the ground antenna described above is not physically connected to other parts, the ground antenna and other parts will have an interactive effect, which must be considered together when designing the RFID tag.

[0114] Example 1

[0115] Fabricate the RFID tag 10a as Figure 1 shown, and separately measure the recognizable reading distance of only the RFID tag 10a in the EU band (865 - 868 MHz) and the US band (902 - 928 MHz). The results show that the recognizable reading distance in the EU band is 4.077 meters, and the recognizable reading distance in the US band is 8.495 meters.

[0116] Example 2

[0117] The RFID tag 10a is completely bonded to the surface of the aluminum foil bag (i.e., the entire RFID tag sticker 10a completely overlaps with the surface of the aluminum foil bag), and the recognizable reading distance thereof in the EU frequency band and the US frequency band is measured. The results show that the RFID tag 10a is severely interfered by the aluminum foil bag, and the RFID tag 10a on the aluminum foil bag cannot be recognized and read. The recognizable reading distances in the EU frequency band and the US frequency band are 0 meters.

[0118] Example 3

[0119] The RFID tag 10a is partially bonded to the aluminum foil bag (i.e., the grounding antenna 400 of the RFID tag 10a partially overlaps with the aluminum foil bag, and the other parts of the RFID tag are located outside the aluminum foil bag, as Figure 7 shown), and the recognizable reading distance thereof in the EU frequency band and the US frequency band is measured. The results show that the recognizable reading distance in the EU frequency band is 7.575 meters, and the recognizable reading distance in the US frequency band is 7.332 meters.

[0120] It can be confirmed from the results of the above Examples 1-3 that the RFID tag according to the embodiment of the present utility model can effectively overcome the limitations and interferences suffered when the RFID tag is applied to a metal bag body, and greatly improve the disadvantages of the prior art. In addition, by comparing the experimental results of Example 1 and Example 3 in the EU frequency band, the reading distance increases. And by comparing the experimental results of Example 1 and Example 3 in the US frequency band, the reading distance still remains at a good level and is not severely interfered. This result shows that after connecting the part corresponding to the grounding antenna in the RFID tag to the metal bag body, the metal bag body not only does not cause interference, but instead has a gain effect. The present utility model is not intended to be limited by any theory. Based on this result, it is speculated that it may be the combined action of multiple features of the RFID tag according to the embodiment of the present utility model and its connection relationship with the metal bag body that makes the metal bag body change from the original interference source to an energy reflector of the RFID tag, substantially increasing the equivalent area of the grounding antenna, and thus improving the reading distance and / or recognition rate of the RFID tag.

Claims

1. An RFID tag, characterized in that: Comprising: Coupled antenna, comprising: A conductive section extending in a first direction; and A coupling section extending from one end of the conductive section in a second direction, wherein the second direction is not parallel to the first direction; A ground antenna parallel to the coupling section, and the ground antenna is spaced apart from the coupling section by a distance, the ground antenna and the conductive section are respectively located on opposite sides of the coupling section, and the width of the ground antenna is greater than the width of the coupling section; A signal source structure, comprising an RFID chip and a loop antenna, the RFID chip is electrically connected to the loop antenna, and the signal source structure and the coupling section are located on the same side of the conductive section; A connecting line segment, one end of the connecting line segment is physically connected to the loop antenna, and the other end of the connecting line segment is physically connected to the conductive section; A bent antenna extending from the other end of the conductive section; and A carrier for carrying the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna.

2. The RFID tag according to claim 1, wherein: It further comprises another carrier, the other carrier and the carrier are respectively located on opposite sides of the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna, and the other carrier and the carrier jointly cover the coupled antenna, the signal source structure, the connecting line segment, the ground antenna and the bent antenna.

3. An RFID tag according to claim 1 or 2, characterized in that: Wherein the width of the ground antenna is greater than the distance between the ground antenna and the coupling section, the distance between the ground antenna and the coupling section is less than the distance between the loop antenna and the coupling section, and the distance between the ground antenna and the coupling section is less than the width of the connecting line segment.

4. An RFID tag according to claim 1 or 2, characterized in that: Wherein the width of the connecting line segment is less than the width of the conductive section, and the width of the connecting line segment is less than or substantially equal to the width of the coupling section.

5. An RFID tag according to claim 1, characterized in that: Wherein the bent antenna comprises an extension section, a first short line segment, a first long line segment, a second short line segment and a second long line segment connected in sequence, and wherein The extension section extends from the other end of the conductive section, and the extension section and the coupling section are located on the same side of the conductive section, and The first short line segment extends from the end of the extension section, the first short line segment and the second short line segment are substantially parallel to the conductive section, and the first long line segment and the second long line segment are substantially parallel to the coupling section.

6. The RFID tag according to claim 5, characterized in that: Wherein the width of the first short line segment is greater than the width of the first long line segment, the width of the first long line segment is greater than the width of the second short line segment, and the first long line segment, the second long line segment and the extension section have substantially the same width.

7. An RFID tag according to claim 5, characterized in that: Wherein the bent antenna has a characteristic length, the characteristic length is defined as the sum of the width of the first short line segment, the length of the first long line segment and the width of the second short line segment; wherein the characteristic length is substantially equal to the sum of the width of the second short line segment and the length of the second long line segment; wherein the characteristic length is less than the length of the coupling section, the length of the extension section or the length of the ground antenna; and the characteristic length is greater than the length of the loop antenna.

8. The RFID tag according to claim 5, wherein: The open end of the coupling section forms a clearance area with the end of the extension section. The clearance area has a length, and the length of the clearance area is greater than the width of the loop antenna.

9. The RFID tag according to claim 5, wherein: The length of the coupling section and the length of the extension section are greater than the length of the conductive section.

10. A RFID tag as claimed in claim 9, wherein: The width of the coupling section is less than the width of the extension section, and the length of the coupling section is substantially equal to the length of the extension section.

11. The RFID tag according to claim 1, characterized in that: The bent antenna includes an extension section, a first horizontal section, a first vertical section, a second horizontal section, a second vertical section, and a third horizontal section connected in sequence. The extension section extends from the other end of the conductive section, and the extension section and the coupling section are on the same side of the conductive section, and The first horizontal section extends from the end of the extension section. The first horizontal section, the second horizontal section, and the third horizontal section are substantially parallel to the conductive section. The first vertical section and the second vertical section are substantially parallel to the coupling section.

12. A RFID tag according to claim 11, characterized in that: The first horizontal section, the first vertical section, the second horizontal section, the second vertical section, the third horizontal section, and the extension section have substantially the same width.

13. An RFID tag according to claim 5 or 11, characterized in that: The distance between the loop antenna and the coupling section is less than the distance between the loop antenna and the extension section.

14. A RFID tag as claimed in claim 13, wherein: The distance between the loop antenna and the extension section is 1.2 to 2 times the distance between the loop antenna and the coupling section.

15. An RFID tag according to claim 5 or 11, characterized in that: The distance between the connecting line segment and the coupling section is less than the distance between the connecting line segment and the extension section.

16. A RFID tag according to claim 1, characterized in that: The bent antenna includes an extension section, a fourth horizontal section, a fourth vertical section, a fifth horizontal section, and a fifth vertical section connected in sequence, and The extension section extends from the other end of the conductive section. The fourth horizontal section and the fifth horizontal section are substantially parallel to the conductive section. The extension section, the fourth vertical section, and the fifth vertical section are substantially parallel to the coupling section.

17. An RFID tag according to claim 16, characterized in that: The distance between the loop antenna and the coupling section is less than the distance between the fifth vertical section and the loop antenna.

18. An RFID tag according to claim 5 or 11 or 16, characterized in that: The width of the ground antenna is greater than the width of the extension section, and the width of the extension section is greater than the width of the coupling section.

19. An RFID tag according to claim 1 or 5 or 11 or 16, characterized in that: The ground antenna has a slit.

20. An RFID tag according to claim 19, wherein: The width of the slit is substantially equal to the distance between the ground antenna and the coupling section.

21. A bag body with an RFID tag, characterized in that: Comprising: A bag body including at least one of a metal layer and an antistatic layer; and The RFID tag according to any one of claims 1-20, at least a part of the ground antenna of the RFID tag overlaps with at least one of the metal layer and the antistatic layer.

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