Ultrahigh-frequency anti-metal tag

Abstract

The utility model relates to the technical field of metal tags, in particular to an ultrahigh-frequency anti-metal tag, which is characterized in that an antenna is arranged on a PCB (printed circuit board) bottom plate, the left side and the right side of the antenna are rectangular, the width of the left side and the right side of the antenna is close to that of the PCB bottom plate, the middle part of the antenna is thin-strip-shaped but not connected, the thin-strip-shaped end part of the middle part of the antenna is a gold immersion area, and a die bonding point is arranged in the middle of the gold immersion area; according to the utility model, the frequency is calculated according to the dielectric parameters of the material of the PCB base plate, and various factors are comprehensively considered, so that the size and the shape of the antenna are further designed; compared with the prior art, the reading distance is increased from 13 meters to 17 meters, and farther communication distance and more stable working performance are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of metal labels, in particular to an ultra-high frequency anti-metal label. Background Art

[0002] Anti-metal tags are widely used in intelligent weighing management, highway non-stop toll collection management, license plate anti-counterfeiting recognition management, vehicle grouping and dispatching management, intelligent parking lot management, asset management and many other fields.

[0003] When designing anti-metal tags in the prior art, the dielectric parameters of the PCB substrate material are usually ignored to calculate the frequency to design the antenna, which will result in the communication distance and performance of the tag being restricted.

[0004] Based on the above reasons, the utility model designs an ultra-high frequency anti-metal tag, which improves the overall reading distance and performance stability of the tag by improving the design of the antenna on the PCB, the selection of the PCB board and the calculation of the antenna frequency. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an ultra-high frequency anti-metal tag, which improves the overall reading distance and performance stability of the tag by improving the design of the antenna on the PCB and the selection of the PCB board and the calculation of the antenna frequency.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an ultra-high frequency anti-metal tag, including a PCB bottom plate, an antenna, a gold-immersion area, black glue, a solid crystal point and a through hole. The antenna is arranged on the PCB bottom plate, the left and right sides of the antenna are rectangular and the width is close to the width of the PCB bottom plate, the middle part of the antenna is a thin strip but not connected, the end of the middle thin strip of the antenna is the gold-immersion area, and a solid crystal point is arranged in the middle of the gold-immersion area. The gold-immersion area and the solid crystal point are arranged on the PCB bottom plate through black glue, and the solid crystal point forms a coupling relationship with the end point of the middle thin strip of the antenna.

[0007] The immersion gold area can also be an electro-nickel area.

[0008] The thickness of the metal label is ≤3.7mm.

[0009] The PCB base plate is made of FR4.

[0010] The bottom surface of the PCB base plate is provided with a 79mm×19mm copper covering.

[0011] Symmetrical through holes with a diameter of 4 mm and no copper covering are arranged on both sides of the PCB bottom plate.

[0012] The four corners of the PCB bottom plate are set to be rounded.

[0013] Metal vias are provided on both sides of the PCB base plate to connect the copper on the front and back sides of the PCB base plate.

[0014] The outermost layer of the metal label is coated with black oil.

[0015] Compared with the existing technology, the utility model calculates the frequency according to the dielectric parameters of the PCB base material and comprehensively considers various factors, and then designs the size and shape of the antenna. Compared with the existing technology, the reading distance is increased from 13 meters to 17 meters, achieving a longer communication distance and more stable working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Description of reference numerals:

[0018] 1 is the PCB base plate, 2 is the antenna, 3 is the immersion gold area, 4 is the black glue, 5 is the die-bonding point, and 6 is the through hole. DETAILED DESCRIPTION

[0019] The utility model is now further described with reference to the accompanying drawings.

[0020] See also Figure 1 The utility model provides an ultra-high frequency anti-metal tag, including a PCB bottom plate 1, an antenna 2, a gold-immersion area 3, black glue 4, a solid crystal point 5 and a through hole 6. The antenna 2 is arranged on the PCB bottom plate 1, the left and right sides of the antenna 2 are rectangular and the width is close to the width of the PCB bottom plate 1, the middle part of the antenna 2 is a thin strip but not connected, the end of the middle thin strip of the antenna 2 is the gold-immersion area 3, and the solid crystal point 5 is arranged in the middle of the gold-immersion area 3. The gold-immersion area 3 and the solid crystal point 5 are arranged on the PCB bottom plate 1 through the black glue 4, and the solid crystal point 5 forms a coupling relationship with the end point of the middle thin strip of the antenna 2.

[0021] The immersion gold area 3 can also be an electro-nickel area.

[0022] The thickness of the metal label is ≤3.7mm.

[0023] The PCB base plate 1 is a PCB base plate made of FR4.

[0024] The bottom surface of the PCB base plate 1 is provided with a copper covering of 79 mm×19 mm.

[0025] Symmetrical through holes 6 with a diameter of 4 mm and without copper covering are arranged on both sides of the PCB bottom plate 1 .

[0026] The four corners of the PCB bottom plate 1 are configured to be rounded.

[0027] Metal vias connecting the copper on the front and back sides of the PCB bottom plate 1 are arranged on both sides of the PCB bottom plate 1 .

[0028] The outermost layer of the metal label is coated with black oil.

[0029] Working principle:

[0030] There is a close correlation between the operating frequency of the PCB tag and the shape of the antenna 2. These antennas 2 are composed of grooves cut out of the metal surface and are suitable for ultra-high frequency applications. Their size determines the frequency range of operation. The dielectric constant of the PCB material of the utility model is 4.5. In order to meet the operating frequency of 915MHZ, the electromagnetic frequency of the PCB is simulated by electromagnetic simulation software, and then the resonant structure in the PCB design is used to calculate the resonant frequency to estimate the operating frequency. Its size limits the tag size to 80mm×20mm. Considering the matching with the microchip, the actual size limit of the PCB bottom plate 1, the physical size, directivity, gain, impedance matching and manufacturing cost of the antenna, the antenna 2 is designed to be rectangular at both ends and thin strips in the middle. This design can improve the performance of the antenna to a certain extent, so that it can maintain good reading and writing effects in different application environments.

[0031] The above are only preferred implementations of the present invention, which are only used to help understand the method and core ideas of the present application. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] The utility model solves the problems of insufficient consideration of the dielectric constant of the PCB base material and other comprehensive factors in the design of the tag antenna in the prior art, which leads to insufficient performance optimization and unreasonable design. By comprehensively considering the working frequency, dielectric constant, physical properties and cost of the PCB tag, the tag is improved and designed to achieve a better reading distance. From the perspective of comprehensive design and cost, the optimal design of performance stability and reading quality is achieved, which helps to promote the product development of anti-metal tags.

Claims

1. An ultra-high frequency anti-metal tag, characterized in that: The invention comprises a PCB bottom plate (1), an antenna (2), a gold-immersion area (3), black glue (4), a crystal-fixing point (5) and a through hole (6). The PCB bottom plate (1) is provided with an antenna (2). The left and right sides of the antenna (2) are rectangular and have a width close to the width of the PCB bottom plate (1). The middle of the antenna (2) is in a thin strip shape but is not connected. The end of the thin strip in the middle of the antenna (2) is the gold-immersion area (3). A crystal-fixing point (5) is provided in the middle of the gold-immersion area (3). The gold-immersion area (3) and the crystal-fixing point (5) are provided on the PCB bottom plate (1) through the black glue (4). The crystal-fixing point (5) forms a coupling relationship with the end point of the thin strip in the middle of the antenna (2).

2. The UHF anti-metal tag according to claim 1, characterized in that: The immersion gold area (3) is an electro-nickel area.

3. The UHF anti-metal tag according to claim 1, characterized in that: The thickness of the metal label is ≤3.7 mm.

4. The UHF anti-metal tag according to claim 1, characterized in that: The PCB base plate (1) is a PCB base plate made of FR4.

5. The UHF anti-metal tag according to claim 1, characterized in that: The bottom surface of the PCB base plate (1) is provided with a 79 mm×19 mm copper covering.

6. The UHF anti-metal tag according to claim 1, characterized in that: Symmetrical through holes (6) with a diameter of 4 mm and not covered with copper are provided on both sides of the PCB bottom plate (1).

7. The UHF anti-metal tag according to claim 1, characterized in that: The four corners of the PCB bottom plate (1) are configured as rounded corners.

8. The UHF anti-metal tag according to claim 1, characterized in that: Metal vias for connecting the copper on the front and back sides of the PCB bottom plate (1) are provided on both sides of the PCB bottom plate (1).

9. The UHF anti-metal tag according to claim 1, characterized in that: The outermost layer of the metal label is coated with black oil.

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