An RFID electronic tag

Abstract

The utility model discloses a kind of RFID electronic tags, including substrate and the metal radiation unit, rectangular slot unit and RFID chip being set on substrate, metal radiation unit includes the first bending arm and second bending arm in the longitudinal direction of substrate in one side thereof and the third bending arm and fourth bending arm in the longitudinal direction of substrate in the other opposite side thereof, rectangular slot unit at least includes first rectangular slot, second rectangular slot and third rectangular slot being set with each other interval, first bending arm, second bending arm, third bending arm and fourth bending arm are respectively annularly set in rectangular slot unit, so that metal radiation unit surrounds rectangular slot unit, RFID chip is arranged at the gap between second rectangular slot and third rectangular slot, so it can communicate in liquid environment such as water-based paint, and it has the advantages of small overall size, simple structure and tunable.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to an RFID electronic tag, which can be used as an RFID electronic tag for water-based coating products. Background Technology

[0002] RFID tags, also known as radio frequency identification tags, are electronic devices that use radio signals to achieve contactless data identification and transmission. They typically consist of an RFID chip and an antenna.

[0003] With the popularization of UHF RFID technology, its application scenarios have gradually expanded from ordinary commodities such as cardboard boxes and clothing to complex environments with special requirements for tag performance, such as liquid environments like water-based coatings. Because liquids (such as water) have a high dielectric constant, they strongly absorb and reflect electromagnetic waves. This can cause the antenna of RFID electronic tags to become detuned and its performance to degrade. In addition, liquid molecules undergo polarization relaxation in the UHF band, which can also absorb a large amount of energy, thus preventing the RFID electronic tags from being activated. Utility Model Content

[0004] To address the aforementioned problems, this invention provides an RFID electronic tag that can communicate in liquid environments such as water-based coatings, and has advantages such as small overall size, simple structure, and tunability.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model provides an RFID electronic tag, including a substrate and a metal radiating unit, a rectangular slot unit, and an RFID chip disposed on the substrate. The metal radiating unit includes a first bent arm and a second bent arm located on one side of the substrate in its longitudinal direction, and a third bent arm and a fourth bent arm located on the opposite side of the substrate in its longitudinal direction. The first bent arm and the second bent arm are laterally spaced relative to each other, and the third bent arm and the fourth bent arm are laterally spaced relative to each other. The first bent arm is connected to the third bent arm, and the second bent arm is connected to the fourth bent arm. The rectangular slot unit includes at least a first rectangular slot, a second rectangular slot, and a third rectangular slot arranged at intervals from each other. The first bent arm, the second bent arm, the third bent arm, and the fourth bent arm are respectively arranged around the rectangular slot unit so that the metal radiating unit surrounds the rectangular slot unit. The RFID chip is disposed in the gap between the second rectangular slot and the third rectangular slot.

[0006] Furthermore, a micro-etched notch is provided between the second rectangular groove and the third rectangular groove, and the RFID chip is disposed in the micro-etched notch.

[0007] Furthermore, the dimensions of the first rectangular slot and / or the second rectangular slot and / or the third rectangular slot are matched to the harmonic frequencies of the RFID electronic tag.

[0008] Furthermore, the relatively extended ends of the third and fourth bent arms are arranged at a longitudinal distance, forming an interdigitated structure for tuning.

[0009] Furthermore, the first bent arm, the second bent arm, the third bent arm, and the fourth bent arm are all etched aluminum wires.

[0010] Furthermore, the substrate is a polyimide substrate or a polyethylene terephthalate substrate.

[0011] The technical solution provided by this utility model has the following beneficial effects: This invention has the advantages of small overall size, simple structure and adjustable function. If it is attached to the side of a paint bucket, it can be used for stable reading over a long distance when multiple paint buckets are stacked. Attached Figure Description

[0012] Figure 1 The image shown is a schematic diagram of the RFID electronic tag in the embodiment; Figure 2 The image shown is a simulation diagram of the RFID electronic tag in the embodiment. Detailed Implementation

[0013] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0015] Reference Figure 1 and Figure 2 This embodiment provides an RFID electronic tag, including a substrate 10 and a metal radiating unit, a rectangular slot unit, and an RFID chip 9 disposed on the substrate 10. The metal radiating unit and the rectangular slot unit together form the antenna structure of the RFID electronic tag. Naturally, the metal radiating unit, the rectangular slot unit, and the RFID chip 9 are all located on the same side of the substrate 10.

[0016] The metal radiation unit includes a first bent arm 1 and a second bent arm 2 located on the upper side of the substrate 10, and a third bent arm 6 and a fourth bent arm 7 located on the lower side of the substrate 10. The first bent arm 1 and the second bent arm 2 are arranged with a left-right (i.e., lateral) relative spacing, and the third bent arm 6 and the fourth bent arm 7 are arranged with a left-right relative spacing. The first bent arm 1 is connected to the third bent arm 6 and is electrically connected to each other, and the second bent arm 2 is connected to the fourth bent arm 7 and is electrically connected to each other.

[0017] The rectangular slot unit includes a first rectangular slot 3, a second rectangular slot 4, and a third rectangular slot 5 arranged at intervals between each other. A first bent arm 1, a second bent arm 2, a third bent arm 6, and a fourth bent arm 7 are respectively arranged around the rectangular slot unit so that the metal radiation unit surrounds the rectangular slot unit. Of course, each rectangular slot is a hollow structure, and the number of them is not limited to this; there can be more than four.

[0018] Furthermore, a micro-etched notch is provided in the gap between the second rectangular slot 4 and the third rectangular slot 5, and the RFID chip 9 is disposed in the micro-etched notch. This enables energy transmission between the antenna structure and the RFID chip 9, and also allows for impedance matching between the two.

[0019] In this embodiment, the substrate 10 is a polyimide substrate or a polyethylene terephthalate substrate, and the first bending arm 1, the second bending arm 2, the third bending arm 6 and the fourth bending arm 7 are etched aluminum lines. Specifically, the metal aluminum layer on the substrate 10 is patterned by etching process to form the antenna structure of the RFID electronic tag.

[0020] By adjusting the dimensions of the first rectangular slot 3 and / or the second rectangular slot 4 and / or the third rectangular slot 5, the harmonic frequency of the RFID tag can be freely adjusted. This facilitates overall miniaturization and allows for further tuning in simulation. Specifically, adjusting the dimensions of the second rectangular slot 4 enables rapid and effective tuning, while adjusting the dimensions of the first rectangular slot 3 and the third rectangular slot 5 provides auxiliary tuning. Of course, the line width, line spacing, vertical arm height, and horizontal arm length of the first bent arm 1 and the second bent arm 2 can all be set according to the actual performance of the RFID tag, and the corresponding dimensional parameter values ​​can be the same or different. Similarly, the length, width, and height of the first rectangular slot 3, the second rectangular slot 4, and the third rectangular slot 5 can all be set according to the actual performance of the RFID tag, and their dimensional parameter values ​​can be the same or different.

[0021] In addition, the relative extension ends of the third bent arm 6 and the fourth bent arm 7 are arranged with an upper and lower (i.e., longitudinal) spacing, forming an interdigital structure 8 for tuning. This facilitates overall miniaturization and allows for further tuning in simulation.

[0022] In practice, each RFID tag is affixed to the side of a paint bucket containing water-based paint, and the buckets are stacked in a 4×5×3 pattern to form a stack of 60 paint buckets. The orientation of each RFID tag is randomized, and the tags are read from the side, top, etc. using a handheld device. After preliminary frequency response testing, the RFID tags can be further simulated and tuned according to actual conditions. Specifically, as follows... Figure 2 As shown.

[0023] In summary, the RFID electronic tag of this embodiment has the advantages of small overall size, simple structure and tunability. If it is attached to the side of a paint bucket, it can be stably read from a distance in a stack of multiple paint buckets. Therefore, it can communicate in liquid environments such as water-based paint and is easy to activate.

[0024] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An RFID electronic tag, characterized in that: It includes a substrate and a metal radiating unit, a rectangular groove unit and an RFID chip disposed on the substrate; The metal radiation unit includes a first bent arm and a second bent arm located on one side of the substrate in its longitudinal direction, and a third bent arm and a fourth bent arm located on the other opposite side of the substrate in its longitudinal direction. The first bent arm and the second bent arm are laterally spaced relative to each other, and the third bent arm and the fourth bent arm are laterally spaced relative to each other. The first bent arm is connected to the third bent arm, and the second bent arm is connected to the fourth bent arm. The rectangular slot unit includes at least a first rectangular slot, a second rectangular slot, and a third rectangular slot arranged at intervals between each other. The first bent arm, the second bent arm, the third bent arm, and the fourth bent arm are respectively arranged around the rectangular slot unit so that the metal radiation unit surrounds the rectangular slot unit. The RFID chip is disposed in the gap between the second rectangular slot and the third rectangular slot.

2. The RFID electronic tag according to claim 1, characterized in that: A micro-etched notch is provided between the second rectangular groove and the third rectangular groove, and the RFID chip is disposed in the micro-etched notch.

3. The RFID electronic tag according to claim 1, characterized in that: The dimensions of the first rectangular slot and / or the second rectangular slot and / or the third rectangular slot are matched to the harmonic frequencies of the RFID electronic tag.

4. The RFID electronic tag according to claim 1, characterized in that: The relative extended ends of the third and fourth bent arms are arranged at a longitudinal distance and form an interdigitated structure for tuning.

5. The RFID electronic tag according to claim 1, characterized in that: The first bent arm, the second bent arm, the third bent arm, and the fourth bent arm are all etched aluminum wires.

6. The RFID electronic tag according to claim 1, characterized in that: The substrate is a polyimide substrate or a polyethylene terephthalate substrate.

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