RFID tag capable of being bent by 90 degrees

Abstract

The utility model discloses an RFID tag capable of being bent by 90 degrees, which is of a rectangular structure and comprises stacked tag paper, a chip, an antenna and a base material. The antenna comprises a feed ring, a first radiation unit and a second radiation unit. The feed ring directly provides excitation for the chip; the first radiation unit and the second radiation unit are respectively led out from two sides of the feed ring; the RFID tag is characterized in that the first radiation unit and the second radiation unit both adopt slotted plate-shaped structures, and the length of the first radiation unit is not less than 40% of the length of the whole RFID tag; in the area where the first radiation unit is located, the printing surface of the RFID tag is provided with a bending indication mark which is used for guiding a user to bend and attach the RFID tag to the corner of the attachment. According to the RFID tag, the slot antenna is adopted as the radiation units, and the two radiation units are asymmetrically arranged, so that the chip can be prevented from being touched during bending, the robustness of bending use of the RFID tag is ensured, and the read-write gain of the RFID tag in the direction with the worst gain is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of super high frequency RFID label, especially relates to a 90-degree bendable RFID label. BACKGROUND

[0002] Traditional super high frequency RFID label usually adopts surface pasting mode to be flat or slightly arc-shaped to be attached on the surface of the identified object. However, the surface pasting label has the following technical problems: when the label is in a dense stacking environment, since only one side has the label, the performance of the other side is rapidly weakened, which is not conducive to the inventory of the stacking environment, and can cause the read-write performance to decrease in extreme conditions such as dense stacking, resulting in identification failure. SUMMARY

[0003] The utility model aims at giving a 90-degree bendable RFID label, which can be used as a box sealing label and has good read-write performance. The specific technical scheme is as follows:

[0004] A 90-degree bendable RFID label, rectangular structure, including base material, antenna and chip, the antenna includes feed ring, first radiation unit, second radiation unit, the chip is attached on the feed ring, and the excitation is provided by the feed ring, the first radiation unit, the second radiation unit is connected with the two sides of feed ring respectively, characterized by: the first radiation unit, the second radiation unit all adopt the structure of slotted plate, the length of the first radiation unit is not less than 40% of the total length of the RFID label, in the area where the first radiation unit is located, the printed surface of the RFID label is provided with a bending indication mark, and the bending indication mark is used to guide the user to bend and paste the RFID label at the corner of the attached object.

[0005] Further, the total length of the RFID label is 80mm-160mm, and the width is 10mm-55mm.

[0006] Further, the length of the first radiation unit is 40%-70% of the total length of the RFID label.

[0007] Further, the bending indication mark is arranged at 25%-55% of the total length of the RFID label.

[0008] Further, the slot type in the slotted plate structure is T-shaped, D-shaped or L-shaped.

[0009] Further, the working frequency band of the antenna is 860-960MHz.

[0010] Further, the base material is a PET base material, and the thickness is not greater than 50μm.

[0011] Further, the RFID tag further comprises a back adhesive and a release paper arranged on the back of the substrate.

[0012] Further, the RFID tag has a size of 92*23mm, and the length of the first and second radiation units is 51% and 28% of the total length of the RFID tag respectively; the first radiation unit is provided with a D-shaped slot, and the second radiation unit is provided with a T-shaped slot.

[0013] Compared with the prior art, the utility model has the remarkable characteristics that:

[0014] The RFID tag adopts a slot antenna as a radiation unit, and the two radiation units are asymmetrically arranged, so that the bending position falls on the radiation unit, the chip can be avoided from being touched during bending, the robustness of the RFID tag in bending use is ensured, and the read-write gain in the direction with the worst gain is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the planar structure of the RFID tag of the utility model;

[0016] Figure 2 is the schematic view of the layer structure of the RFID tag of the utility model;

[0017] Figure 3 is the bending use example of the RFID tag of the utility model;

[0018] Figure 4 is the gain diagram of the RFID tag of the utility model in flat pasting and bending. DETAILED DESCRIPTION

[0019] To further illustrate the embodiments, the utility model provides drawings. These drawings are part of the disclosure of the utility model, mainly used to illustrate the embodiments, and can be used to explain the operation principle of the embodiments in cooperation with the related description of the specification. With reference to these contents, those skilled in the art should understand other possible implementation manners and the advantages of the utility model. The components in the drawings are not drawn according to scale, and similar component symbols are usually used to represent similar components.

[0020] The utility model will be further illustrated in combination with the drawings and specific embodiments.

[0021] Embodiment 1:

[0022] As Figure 1 and Figure 2As shown, the utility model discloses a kind of 90 degrees bendable RFID label.The RFID label is designed as rectangle, which is composed of label paper 1, chip 6, antenna 2, substrate 3 and the like stacked in sequence, and usually coated with back adhesive 4 on the back of substrate 3, and provided with release paper 5 to facilitate use.The core part of antenna 2 is composed of feed ring 23, first radiation unit 21 and second radiation unit 22.The first radiation unit 21 and the second radiation unit 22 are respectively led out from both sides of the feed ring 23.In this embodiment, the first radiation unit 21 and the second radiation unit 22 are designed as slot antenna with slotted plate structure, and the first radiation unit 21 and the second radiation unit 22 are designed asymmetrically, with different lengths, and the length of the first radiation unit 21 is not less than 40% of the total length of the RFID label 100.The length of the first radiation unit 21 is preferably between 40% and 70%.The pin of the chip 6 and the opening of the feed ring 23 are combined by conductive glue, and the chip 6 is excited by the feed ring 23, and impedance matching between the antenna 2 and the chip 6 is achieved by adjusting the size of the feed ring 23.

[0023] In this embodiment, the first radiation unit 21 is provided with a D-shaped slot 211, and the second radiation unit 22 is provided with a T-shaped slot 221.The D-shaped slot 9 and the T-shaped slot 221 can guide the current flow, increase the current path, and the first radiation unit 21 and the second radiation unit 22 are designed as slotted plate structure with large-area metal to increase the radiation efficiency.In this RFID label 100, the area where the first radiation unit 21 is located is the bending area, and since the first radiation unit 21 is designed as slotted plate structure, the current path is wide and not easy to break when bending, which can improve the robustness of the first radiation unit 21 and ensure that the electrical performance of the RFID label 100 is not affected after bending.A bending position mark, such as the dashed line 8, can be silk-screened on the label paper 1 of the RFID label, which can also be marked as a block.The user can be guided to bend the RFID label at the mark, so that the chip 6 will not be touched during bending and the RFID label will not be damaged, and the antenna has better performance.

[0024] The dashed line 8 divides the RFID label into left and right parts, and the proportion of the left part to the total length of the RFID label 100 is 25% to 55%, which is determined according to the specific application.The larger the proportion, the higher the resonant frequency of the label after bending, and the frequency can be adjusted by controlling the position of the dashed line 8.

[0025] The slot type in the slot antenna can be extended in circumference by adopting T-shaped, D-shaped and L-shaped shapes, so as to increase the current path and miniaturize the label.

[0026] In the embodiment, the substrate 3 preferably adopts a substrate such as PET which has good performance, low cost and is easy to process, and the thickness of the substrate is not more than 50 μm to ensure the flexibility of the RFID tag, and the substrate and the antenna will not be broken when the RFID tag is bent at 90 degrees.

[0027] In the embodiment, the overall length of the RFID tag 100 is 80 mm to 160 mm and the width is 10 mm to 55 mm according to the specific requirements. By designing appropriate slots on the large-area metal sheet structure, the antenna gain of the RFID tag 100 can be ensured, and the readability of the antenna can be ensured.

[0028] In the embodiment, the RFID tag 100 has the following specifications:

[0029] The size is 92*23 mm

[0030] Type: passive, read-write

[0031] Operating frequency: 860-960 MHz (can be produced according to the frequency requirements of different countries)

[0032] Chip: super high frequency RFID chips such as FM13UF0051E, FM13UF011E, UCODE 9, etc. These chips comply with communication protocols such as EPC Global Class1 Gen2 V2 and ISO / IEC 18000-6X

[0033] Polarization direction: linear polarization

[0034] Label substrate: PET, paper, etc.

[0035] The length of the first radiating unit 21 is about 36.5 mm, which accounts for about 51% of the total length of the RFID tag, and the length of the second radiating unit 22 is about 26 mm, which accounts for about 28% of the total length of the RFID tag; the dashed line 8 divides the RFID tag into left and right parts, and the left half accounts for about 40% of the total length of the RFID tag.

[0036] Embodiment two

[0037] As shown in Figure 3 , an application example of applying the RFID tag 100 to a packaging box is given. In the embodiment, the RFID tag 100 is attached to the outer surface of the packaging box 12 (it can also be attached to the inner surface). The RFID tag 100 is bent at 90 degrees along the position marked by the dashed line 8 and attached to the edge of the packaging box 12. The label can be attached to the non-attached part of the packaging box 12. Compared with the traditional label which is directly attached to the box, this kind of attachment can also improve the label gain, increase about 7 dB in the worst direction, and enhance the readability of the label.Figure 4 as shown.

[0038] It should be noted that the bending angle of the present RFID tag 100 is not limited to 90 degrees, and is only used to illustrate that the tag is suitable to be attached to the edge of the identified object such as a packaging box, so that it can be more effectively read when the identified objects are stacked.

[0039] In summary, compared with the prior art, the present RFID tag has the following significant features: the present RFID tag uses a slot antenna as a radiation unit, and the two radiation units are asymmetrically arranged, so that the bending position falls on the radiation unit, which can avoid touching the chip when bending, ensure the robustness of the RFID tag when bending, and enhance the read-write gain of the RFID tag in the direction with the worst gain.

[0040] Although the present utility model is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present utility model in form and details without departing from the spirit and scope of the present utility model as defined in the appended claims, and all such changes are within the protection scope of the present utility model.

Claims

1. A 90 degree bendable RFID tag, characterized by: The rectangular structure comprises a substrate, an antenna and a chip, the antenna comprises a feeding ring, a first radiating unit and a second radiating unit; the chip is attached to the feeding ring and is excited by the feeding ring; the first radiating unit and the second radiating unit are connected to two sides of the feeding ring respectively; characterized in that: the first radiating unit and the second radiating unit both adopt a slotted plate structure, the length of the first radiating unit is not less than 40% of the total length of the RFID tag; in the area where the first radiating unit is located, the printed surface of the RFID tag is provided with a bending indication mark, which is used to guide the user to bend the RFID tag and attach it to the corner of the attached object.

2. The 90 degree bendable RFID tag of claim 1, wherein: The total length of the RFID tag is 80mm-160mm, and the width is 10mm-55mm.

3. The 90 degree bendable RFID tag of claim 1, wherein: The length of the first radiating unit is 40%-70% of the total length of the RFID tag.

4. The 90 degree bendable RFID tag of claim 3, wherein: The bending indication mark is arranged at 25%-55% of the total length of the RFID tag.

5. The 90 degree bendable RFID tag of claim 1, wherein: The slot type in the slotted plate structure is T-shaped, D-shaped or L-shaped.

6. The 90 degree bendable RFID tag of claim 1, wherein: The working frequency range of the antenna is 860-960MHz.

7. The 90 degree bendable RFID tag of claim 1, wherein: The substrate is a PET substrate with a thickness not greater than 50μm.

8. The 90 degree bendable RFID tag of claim 1, wherein: The RFID tag further comprises a back adhesive and a release paper arranged on the back of the substrate.

9. The 90 degree bendable RFID tag of claim 1, wherein: The size of the RFID tag is 92*23mm, and the lengths of the first radiating unit and the second radiating unit are equal to 51% and 28% of the total length of the RFID tag respectively; The first radiating unit is provided with a D-shaped slot, and the second radiating unit is provided with a T-shaped slot.

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