Electronic tag and electronic tag manufacturing method

Abstract

The embodiment of the invention discloses an electronic tag and an electronic tag manufacturing method. The electronic tag comprises a first antenna, a common ground plane, a second antenna, a shell, a metal back sticker and at least one isolation wall, the first antenna is used for transmitting signals, the second antenna is used for receiving signals, and the first antenna and the second antenna are located on the two opposite sides of a common ground plane respectively in the first direction and are electrically connected with a circuit in the common ground plane respectively; the first antenna, the common ground plane and the second antenna are arranged in the shell; the metal back sticker is arranged on a preset surface of the shell, and the preset surface is opposite to the common ground plane; the common ground plane and the metal back paste are electrically connected through the isolation wall. According to the embodiment of the invention, through the design of the metal back paste and the isolation wall, the isolation degree and the antenna efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency identification technology, and in particular to an electronic tag and a method for manufacturing the electronic tag. Background Art

[0002] Metal surfaces reflect and absorb radio frequency signals, significantly reducing the read distance of RFID tags or even rendering them unreadable. Metal's reflection of electromagnetic waves and eddy current effects can severely interfere with the performance of the tag antenna, preventing it from functioning properly.

[0003] In existing technology, electronic tags may need to be deployed on the surface of metal objects. These tags contain a transmitting antenna and a receiving antenna, each operating in different frequency bands. Because metal is a good conductor, electromagnetic waves are strongly reflected from its surface rather than penetrating or radiating. This causes antenna energy to be reflected back into the system rather than effectively radiated outward. Furthermore, to miniaturize the antennas of these electronic tags, the two antennas must share a common ground plane, causing the current paths of the transmitting and receiving antennas to overlap, resulting in strong near-field coupling, significantly reducing isolation and antenna efficiency. Summary of the Invention

[0004] The present invention provides an electronic tag and a method for manufacturing the electronic tag, which can improve isolation and antenna efficiency through the design of a metal back sticker and an isolation wall.

[0005] According to one aspect of the present invention, there is provided an electronic tag, comprising:

[0006] a first antenna, a common ground plane, a second antenna, a housing, a metal backing, and at least one isolation wall;

[0007] The first antenna is used to transmit signals, and the second antenna is used to receive signals. The first antenna and the second antenna are respectively located on opposite sides of a common ground plane along a first direction, and the first antenna and the second antenna are respectively electrically connected to a circuit in the common ground plane;

[0008] The first antenna, the common ground plane and the second antenna are arranged in the shell; the metal back sticker is arranged on a preset surface of the shell, and the preset surface is arranged opposite to the common ground plane; the common ground plane and the metal back sticker are electrically connected through an isolation wall.

[0009] Optionally, the isolation wall includes at least two isolation sub-walls, the at least two isolation sub-walls are arranged in sequence along the second direction, and each isolation sub-wall is electrically connected to the common ground plane and the metal backing; or, the isolation wall is an integral structure, and a vertical projection of the isolation wall on the surface of the metal backing is a strip structure extending along the second direction;

[0010] The second direction intersects with the first direction and is parallel to the surface of the common ground plane adjacent to the metal backing.

[0011] Optionally, the electronic tag includes two isolation walls, both of which are connected to the metal backing, and the two isolation walls are arranged in sequence along the first direction.

[0012] Optionally, the electronic tag includes two metal backing stickers;

[0013] The two metal back stickers are arranged in sequence along the first direction, and each isolation wall is connected to one metal back sticker.

[0014] Optionally, the metal backing is arranged inside or outside the shell.

[0015] Optionally, the isolation wall is made of copper foil, aluminum plate or conductive foam;

[0016] The material of the metal backing is copper foil, aluminum plate or conductive foam.

[0017] Optionally, the common ground plane is electrically connected to the isolation wall via a conductive adhesive or a welding layer;

[0018] The metal backing is electrically connected to the isolation wall through a conductive adhesive or a welding layer.

[0019] Optionally, a dielectric layer is provided between the first antenna, the common ground plane, the second antenna and the housing.

[0020] Optionally, the first antenna, the common ground plane, and the second antenna are located in the same plane;

[0021] The first antenna and the second antenna operate in different frequency bands;

[0022] The common ground plane includes a circuit, and the circuit is electrically connected to the first antenna and the second antenna;

[0023] The isolation wall is electrically connected to the ground terminal in the common ground plane.

[0024] According to another aspect of the present invention, a method for producing an electronic tag is provided, which is applicable to the electronic tag according to any embodiment of the present invention. The method comprises:

[0025] An opening is provided at a fixed position on the common ground plane, wherein the opening exposes the circuit in the common ground plane;

[0026] The common ground plane is fixedly disposed in the first portion of the housing;

[0027] placing a metal backing sticker on a predetermined surface of the second portion of the housing;

[0028] electrically connecting one end of the isolation wall to the circuit exposed on the common ground plane;

[0029] The first part and the second part are fixedly connected, and the other end of the isolation wall is electrically connected to the metal backing, and the preset surface is arranged opposite to the common ground plane.

[0030] An electronic tag provided in an embodiment of the present invention includes a first antenna, a common ground plane, a second antenna, a housing, a metal backing, and at least one isolation wall. The first antenna is used to transmit signals, and the second antenna is used to receive signals. The first antenna and the second antenna are located on opposite sides of the common ground plane along a first direction, and the first antenna and the second antenna are electrically connected to a circuit in the common ground plane. The first antenna, the common ground plane, and the second antenna are disposed within the housing. The metal backing is disposed on a predetermined surface of the housing, the predetermined surface being disposed opposite the common ground plane. The common ground plane and the metal backing are electrically connected via the isolation wall. Because the metal backing is disposed on the predetermined surface of the housing and the common ground plane and the metal backing are connected via the isolation wall, when the electronic tag is attached to the surface of a metal object, the metal backing and the isolation wall can shield electromagnetic waves reflected by the metal object, thereby preventing the electromagnetic waves reflected by the metal object from affecting the operation of the first and second antennas and preventing strong near-field coupling, thereby improving isolation and antenna efficiency.

[0031] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic diagram of the structure of an electronic tag provided by an embodiment of the present invention;

[0034] Figure 2 is a top view of an electronic tag provided by an embodiment of the present invention;

[0035] Figure 3 This is a schematic structural diagram of a separation wall provided by an embodiment of the present invention;

[0036] Figure 4 is a schematic structural diagram of another isolation wall provided by an embodiment of the present invention;

[0037] Figure 5 is a schematic structural diagram of another isolation wall provided by an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of another electronic tag provided by an embodiment of the present invention;

[0039] Figure 7 This is a simulation effect diagram without a separation wall provided by an embodiment of the present invention;

[0040] Figure 8 This is a simulation effect diagram of a separation wall provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] An embodiment of the present invention provides an electronic tag. Figure 1 This is a schematic diagram of the structure of an electronic tag provided by an embodiment of the present invention; Figure 2 is a top view of an electronic tag provided by an embodiment of the present invention; Figure 1 and Figure 2 , electronic tags include:

[0044] A first antenna 10, a common ground plane 20, a second antenna 30, a housing 40, a metal backing 50 and at least one isolation wall 60;

[0045] The first antenna 10 is used to transmit signals, and the second antenna 30 is used to receive signals. The first antenna 10 and the second antenna 30 are respectively located on opposite sides of the common ground plane 20 along the first direction X, and the first antenna 10 and the second antenna 30 are respectively electrically connected to the circuit in the common ground plane 20;

[0046] The first antenna 10, the common ground plane 20 and the second antenna 30 are arranged in the shell 40; the metal back sticker 50 is arranged on a preset surface of the shell 40, and the preset surface is arranged opposite to the common ground plane 20; the common ground plane 20 and the metal back sticker 50 are electrically connected through the isolation wall 60.

[0047] The first antenna 10 acts as a transmitting antenna, radiating the signals generated by the electronic tag's internal circuitry into the external space in the form of electromagnetic waves. The second antenna 30 acts as a receiving antenna, capturing signals transmitted by external devices and transmitting them to the circuitry within the common ground plane 20 for processing. The common ground plane 20 includes circuitry electrically connected to the first antenna 10 and the second antenna 20, respectively. The circuitry is used to send signals to the first antenna 10 and receive signals transmitted back from the second antenna 30. The housing 40 acts as a protective structure, enclosing the first antenna 10, common ground plane 20, and second antenna 30. A metal backing 50 is provided on a predetermined surface of the housing 40.

[0048] Specifically, when the electronic tag is operating, the first antenna 10 transmits signals, and the second antenna 30 receives signals. Because the metal backing sticker 50 is disposed on a predetermined surface of the housing 40, and the common ground plane 20 and the metal backing sticker 50 are connected by a partition wall 60, when the electronic tag is attached to the surface of a metal object 80, the metal backing sticker 50 and the partition wall 60 provide a shielding effect, shielding electromagnetic waves reflected by the metal object 80. This prevents electromagnetic waves reflected from the metal object 80 from affecting the operation of the first antenna 10 and the second antenna 30, and prevents strong near-field coupling, thereby improving isolation and increasing antenna efficiency.

[0049] An electronic tag provided in an embodiment of the present invention includes a first antenna 10, a common ground plane 20, a second antenna 30, a housing 40, a metal backing sticker 50, and at least one isolation wall 60. The first antenna 10 is used to transmit signals, and the second antenna 30 is used to receive signals. The first antenna 10 and the second antenna 30 are respectively located on opposite sides of the common ground plane 20 along a first direction X, and the first antenna 10 and the second antenna 30 are respectively electrically connected to the circuit in the common ground plane 20. The first antenna 10, the common ground plane 20, and the second antenna 30 are disposed within the housing 40. The metal backing sticker 50 is disposed on a predetermined surface of the housing 40, which is disposed opposite the common ground plane 20. The common ground plane 20 and the metal backing sticker 50 are electrically connected via the isolation wall 60. Since the metal back sticker 50 is set on a preset surface of the shell 40, the common ground plane 20 and the metal back sticker 50 are connected by the isolation wall 60. When the electronic tag is attached to the surface of the metal object 80, the metal back sticker 50 and the isolation wall 60 can shield the electromagnetic waves reflected back by the metal object 80, thereby preventing the electromagnetic waves reflected back by the metal object 80 from affecting the operation of the first antenna 10 and the second antenna 30, avoiding the formation of strong near-field coupling, thereby improving isolation and improving antenna efficiency.

[0050] Figure 3 This is a schematic structural diagram of a separation wall provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of another isolation wall provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another isolation wall provided by an embodiment of the present invention; Figure 1-Figure 5 Optionally, the isolation wall 60 includes at least two isolation sub-walls 61, and the at least two isolation sub-walls 61 are arranged in sequence along the second direction Y, and each isolation sub-wall 61 is electrically connected to the common ground plane 20 and the metal backing 50; or, the isolation wall 60 is an integrated structure, and the vertical projection of the isolation wall 60 on the surface of the metal backing 50 is a strip structure extending along the second direction Y;

[0051] The second direction Y intersects the first direction X and is parallel to the surface of the common ground plane 20 adjacent to the metal backing 50 .

[0052] The isolation wall 60 may be in the shape of a polygon such as a triangle, rectangle, pentagon, hexagon, etc., or in the shape of a circle, ellipse, or semicircle, etc. The first direction X and the second direction Y may be perpendicular to each other.

[0053] Specifically, the two ends of each isolation sub-wall 61 are electrically connected to the common ground plane 20 and the metal back sticker 50 respectively. When a certain isolation sub-wall 61 is disconnected from the metal back sticker 50 or the common ground plane 20 due to external force, the other isolation sub-walls 61 can still maintain the connection with the metal back sticker 50 and the common ground plane 20, thereby avoiding shielding failure.

[0054] The isolation wall 60 is an integral structure, meaning it is a single piece. It serves as a channel between the common ground plane 20 and the metal backing 50, ensuring stable transmission. The integrated isolation wall 60 forms a continuous shielding layer that, together with the metal backing 50, effectively shields electromagnetic waves reflected from the metal object 80. This prevents electromagnetic waves reflected from the metal object 80 from affecting the operation of the first antenna 10 and the second antenna 30, preventing strong near-field coupling and thereby improving isolation and antenna efficiency.

[0055] Figure 6 This is a schematic diagram of the structure of another electronic tag provided by an embodiment of the present invention; Figure 6 Optionally, the electronic tag includes two isolation walls 60, both of which are connected to the metal backing 50, and the two isolation walls 60 are arranged in sequence along the first direction X.

[0056] Specifically, the two isolation walls 60 are arranged in sequence along the first direction X, and each isolation wall 60 is connected to a metal backing 50 .

[0057] By setting up two isolation walls 60, when one isolation wall 60 is disconnected from the metal back sticker 50 or the common ground plane 20 due to external force, the other isolation wall 60 can still maintain the connection between the metal back sticker 50 and the common ground plane 20, so that the metal back sticker 50 and the isolation wall 60 can still play a shielding role, thereby avoiding shielding failure.

[0058] Continue to refer Figure 6 , Optionally, the electronic tag includes two metal backing stickers 50;

[0059] The two metal backing films 50 are sequentially arranged along the first direction X, and each isolation wall 60 is connected to one metal backing film 50 .

[0060] Specifically, two metal backing stickers 50 are arranged in sequence along the first direction X, and each isolation wall 60 is connected to one metal backing sticker 50. When the connection between one metal backing sticker 50 and the isolation wall 60 is disconnected, the other metal backing sticker 50 can still be connected to the isolation wall 60, thereby still providing a shielding effect and preventing shielding failure.

[0061] Optionally, the metal backing 50 is disposed inside the housing 40 or outside the housing 40 .

[0062] Specifically, the metal back sticker 50 can be set inside or outside the shell 40. The metal back sticker 50 can shield the electromagnetic waves reflected back by the metal object 80, reducing the impact on the first antenna 10 and the second antenna 30.

[0063] Optionally, the isolation wall 60 is made of copper foil, aluminum plate or conductive foam;

[0064] The metal backing 50 is made of copper foil, aluminum plate or conductive foam.

[0065] Specifically, the copper foil, aluminum plate and conductive foam all have good conductivity, which can effectively shield the electromagnetic waves reflected back by the metal object 80, thereby preventing the electromagnetic waves reflected back by the metal object 80 from affecting the operation of the first antenna 10 and the second antenna 30, avoiding the formation of strong near-field coupling, thereby improving isolation and improving antenna efficiency.

[0066] Optionally, the common ground plane 20 is electrically connected to the isolation wall 60 via a conductive adhesive or a welding layer;

[0067] The metal backing 50 is electrically connected to the isolation wall 60 through a conductive adhesive or a welding layer.

[0068] Specifically, the circuit in the common ground plane 20 can be electrically connected to the isolation wall 60 through a welding process, and the metal back sticker 50 can be electrically connected to the isolation wall 60 through a welding process. The circuit in the common ground plane 20 can also be electrically connected to the isolation wall 60 through a conductive adhesive, and the metal back sticker 50 can be electrically connected to the isolation wall 60 through a conductive adhesive, so that the common ground plane 20 and the isolation wall 60, as well as the isolation wall 60 and the metal back sticker 50 are firmly connected.

[0069] Continue to refer Figure 6 Optionally, a dielectric layer 70 is provided between the first antenna 10 , the common ground plane 20 , the second antenna 30 and the housing 40 .

[0070] Specifically, the dielectric layer 70 is an insulating layer. By providing the dielectric layer 70 , the first antenna 10 , the common ground plane 20 and the second antenna 30 are stably disposed in the housing 40 .

[0071] Optionally, the first antenna 10, the common ground plane 20 and the second antenna 30 are located in the same plane;

[0072] The first antenna 10 and the second antenna 30 operate in different frequency bands;

[0073] The common ground plane 20 includes a circuit, which is electrically connected to the first antenna 10 and the second antenna 30;

[0074] The isolation wall 60 is electrically connected to the ground terminal in the common ground plane 20 .

[0075] Specifically, the first antenna 10 is a transmitting antenna, and the second antenna 30 is a receiving antenna. The transmitting antenna and the receiving antenna are connected to the circuit in the common ground plane 20. The circuit is used to transmit signals to the first antenna 10. The first antenna 10 emits electromagnetic waves outward, and the circuit is also used to receive electrical signals transmitted by the second antenna 30 after receiving the electromagnetic waves.

[0076] According to another aspect of the present invention, a method for producing an electronic tag is provided, which is applicable to the electronic tag according to any embodiment of the present invention. The method comprises:

[0077] An opening is provided at a fixed position on the common ground plane, wherein the opening exposes the circuit in the common ground plane;

[0078] A common ground plane is fixedly disposed in the first portion of the housing;

[0079] placing the metal backing sticker on a predetermined surface of the second portion of the housing;

[0080] Electrically connect one end of the isolation wall to the exposed circuit on the common ground plane;

[0081] The first part and the second part are fixedly connected, and the other end of the isolation wall is electrically connected to the metal backing, and the preset surface is arranged opposite to the common ground plane.

[0082] Among them, the common ground plane is the printed circuit board assembly (PCBA). PCBA is a finished product after electronic components are soldered to the printed circuit board through surface mount technology or plug-in technology to complete the circuit function assembly.

[0083] Specifically, an opening is cut or etched at a fixed position of the common ground plane to expose the internal circuitry. The common ground plane is then fixed within the first portion of the housing (e.g., the top shell). A through hole is provided at a corresponding position in the second portion of the housing (e.g., the bottom shell). A metal backing is attached to a predetermined surface of the second portion. One end of a partition wall is connected to the exposed circuitry of the common ground plane. The first and second portions of the housing are fixedly connected using clips, screws, or the like, with the other end of the partition wall passing through the through hole and contacting the metal backing. The partition wall directly connects the common ground plane to the metal backing.

[0084] For example, Figure 7 This is a simulation effect diagram without a separation wall provided by an embodiment of the present invention; Figure 8 This is a simulation effect diagram of a separation wall provided by an embodiment of the present invention. Figure 7 and Figure 8 , the blue curve S11 represents the return loss of the first antenna, the gray curve S22 represents the return loss of the second antenna, and the orange curve S12 represents the isolation. Figure 7 and Figure 8 It can be seen that when there is a separation wall, the isolation between the first antenna and the second antenna is higher.

[0085] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0086] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An electronic tag, characterized in that: include: a first antenna, a common ground plane, a second antenna, a housing, a metal backing, and at least one isolation wall; The first antenna is used to transmit signals, and the second antenna is used to receive signals. The first antenna and the second antenna are respectively located on opposite sides of the common ground plane along a first direction, and the first antenna and the second antenna are respectively electrically connected to the circuit in the common ground plane; The first antenna, the common ground plane and the second antenna are arranged in the shell; the metal back sticker is arranged on a preset surface of the shell, and the preset surface is arranged opposite to the common ground plane; the common ground plane and the metal back sticker are electrically connected through the isolation wall.

2. The electronic tag according to claim 1, characterized in that: The isolation wall includes at least two isolation sub-walls, the at least two isolation sub-walls are arranged in sequence along the second direction, and each of the isolation sub-walls is electrically connected to the common ground plane and the metal backing; or, the isolation wall is an integral structure, and the vertical projection of the isolation wall on the surface of the metal backing is a strip structure extending along the second direction; The second direction intersects the first direction and is parallel to the surface of the common ground plane adjacent to the metal backing.

3. The electronic tag according to claim 1, characterized in that: The electronic tag includes two isolation walls, both of which are connected to the metal backing, and the two isolation walls are arranged in sequence along the first direction.

4. The electronic tag according to claim 3, characterized in that: The electronic tag includes two metal back stickers; The two metal backing stickers are arranged in sequence along the first direction, and each of the isolation walls is connected to one metal backing sticker.

5. The electronic tag according to claim 1, characterized in that: The metal backing is arranged inside the shell or outside the shell.

6. The electronic tag according to claim 1, characterized in that: The isolation wall is made of copper foil, aluminum plate or conductive foam; The material of the metal backing is copper foil, aluminum plate or conductive foam.

7. The electronic tag according to claim 1, characterized in that: The common ground plane is electrically connected to the isolation wall via a conductive adhesive or a welding layer; The metal backing is electrically connected to the isolation wall through a conductive adhesive or a welding layer.

8. The electronic tag according to claim 1, characterized in that: A dielectric layer is provided between the first antenna, the common ground plane, the second antenna and the housing.

9. The electronic tag according to claim 1, characterized in that: The first antenna, the common ground plane and the second antenna are located in the same plane; The first antenna and the second antenna have different operating frequency bands; The common ground plane includes a circuit, and the circuit is electrically connected to the first antenna and the second antenna; The isolation wall is electrically connected to a ground terminal in the common ground plane.

10. A method for producing an electronic label, characterized in that: The electronic tag according to any one of claims 1 to 9, wherein the manufacturing method comprises: An opening is provided at a fixed position on the common ground plane, wherein the opening exposes the circuit in the common ground plane; The common ground plane is fixedly disposed in the first portion of the housing; placing a metal backing sticker on a predetermined surface of the second portion of the housing; electrically connecting one end of the isolation wall to the circuit exposed on the common ground plane; The first part and the second part are fixedly connected, and the other end of the isolation wall is electrically connected to the metal backing, and the preset surface is arranged opposite to the common ground plane.

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