Double-coil inductor ultrahigh frequency radio frequency tag

Abstract

The invention discloses a double-circle inductance ultrahigh frequency radio frequency tag in the technical field of radio frequency tags, which comprises a double-circle inductance framework, a double-circle inductance aluminum foil antenna and an ultrahigh frequency chip with a short-circuit line, and is characterized in that the double-circle inductance aluminum foil antenna surrounds the periphery of the double-circle inductance framework and comprises two circles of aluminum foil antennas which are separated from each other; the ultrahigh frequency chip with the short-circuit line comprises two antenna end point connecting pins and two chip outer layer short-circuit line connecting pins, the two antenna end point connecting pins are respectively connected with one end portion of the two circles of aluminum foil antennas, and the other ends of the two circles of aluminum foil antennas are respectively connected with the two chip outer layer short-circuit line connecting pins. And the two chip outer-layer short-circuit line connecting pins are connected through a chip outer-layer short-circuit line. The ultrahigh frequency radio frequency read-write device can be installed on a product with a metal background to achieve ultrahigh frequency radio frequency read-write operation of a metal package, and the whole device is low in raw material cost and processing cost and beneficial to application and popularization.

Description

Technical Field

[0001] This invention relates to the field of radio frequency tag technology, specifically to a dual-coil inductor ultra-high frequency radio frequency tag. Background Technology

[0002] With the rapid development of IoT technology, UHF RFID tags, as a key component for item identification and tracking, have demonstrated significant application value in multiple fields. Among them, anti-metal UHF RFID tags, due to their ability to adapt to identification needs in metallic environments, have become one of the core technologies for the full lifecycle management of metal products.

[0003] Anti-metal UHF RFID tags on the market are expensive due to the use of special materials and manufacturing processes, which limits their widespread application. For example, the use of special ceramic substrates with high temperature resistance and high insulation performance results in higher costs; another example is the use of precision etching molding, which also increases processing costs.

[0004] Currently, a single-turn inductive ultra-high frequency anti-metal tag has a high cost-performance ratio and has been widely used. However, this type of RFID tag is relatively large and inconvenient to install on automotive parts, metal mechanical parts, high-pressure gas cylinders, and metal packaging, thus limiting its application.

[0005] Therefore, in order to promote the application of radio frequency technology in metallic environments, a small-sized, low-cost anti-metal UHF RFID tag is needed. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a dual-coil inductive ultra-high frequency radio frequency tag.

[0007] The technical solution of this invention is as follows: A dual-circuit inductor ultra-high frequency radio frequency tag includes a dual-circuit inductor frame, a dual-circuit inductor aluminum foil antenna, and an ultra-high frequency chip with a short circuit. The resonant frequency of the ultra-high frequency chip with the short circuit after coupling with the dual-circuit inductor aluminum foil antenna is 900MHz.

[0008] The double-coil inductor frame is made of PP (polypropylene) or ceramic.

[0009] The dual-turn inductor aluminum foil antenna is bonded to the outer periphery of the dual-turn inductor frame. The dual-turn inductor aluminum foil antenna consists of two separate turns of aluminum foil antenna (first turn aluminum foil antenna and second turn aluminum foil antenna), which are arranged side by side and both have openings.

[0010] The UHF chip with short circuit includes two antenna endpoint connection pins and two chip outer short circuit connection pins. The two antenna endpoint connection pins are respectively connected to one end of two coils of aluminum foil antennas, and the other end of the two coils of aluminum foil antennas are respectively connected to the two chip outer short circuit connection pins. The two chip outer short circuit connection pins are connected to each other through the chip outer short circuit.

[0011] This dual-coil inductive UHF RFID tag is mounted on a metal substrate, with the short-circuit UHF chip positioned away from the substrate. Specifically, the tag can be attached to the metal substrate via an adhesive layer or fixed to its surface using an epoxy resin layer.

[0012] According to the above-described solution, the beneficial effects of this invention are that it can be installed on products with a metal background to realize ultra-high frequency radio frequency read and write operations on metal packaging, and the raw material cost and processing cost of the entire device are low, which is conducive to its widespread application.

[0013] This invention utilizes a dual-coil inductive antenna in conjunction with a PP frame or ceramic sheet frame to modify the antenna's size. This allows the dual-coil inductive circuit and the ultra-high frequency chip to resonate at 900MHz against a metal background, meeting the application requirements of the ultra-high frequency band. Furthermore, when the tag is mounted on a long, narrow metal object, the edge of the object couples with the dual-coil inductive circuit to form a "large-size equivalent antenna," significantly increasing the tag's reading distance and further enhancing its identification stability and practicality in metallic environments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the radio frequency chip in this invention; Figure 3 This is a schematic diagram of the adhesive installation method of the present invention; Figure 4 This is a schematic diagram of the drip-type installation of the present invention.

[0015] In the figure, the labels for each item are as follows: 10. UHF chip with short circuit; 11. First antenna terminal connection pin; 12. First chip outer layer short circuit connection pin; 13. Second antenna terminal connection pin; 14. Second chip outer layer short circuit connection pin; 15. Chip outer layer short circuit; 20. Dual-loop inductive aluminum foil antenna; 20', aluminum foil layer; 20”, PET base film; 21. First loop aluminum foil antenna; 22. Second loop aluminum foil antenna; 30. Dual-coil inductor frame; 40. Metal sheet background; 50. Adhesive layer; 51. Epoxy layer. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings and embodiments: like Figures 1 to 4 As shown, in order to overcome the difficulties of applying existing UHF RFID tags to metallic backgrounds, or the high cost, complex manufacturing process, and high price of UHF RFID tags with anti-metal function, as well as their large size, which is not conducive to installation in automotive parts, high-pressure gas cylinders, etc., this invention proposes a dual-coil inductive UHF RFID tag. It utilizes an inductive frame and a dual-coil inductive aluminum foil antenna to form a resonant frequency of 900MHz, which meets the application requirements of the UHF band. Furthermore, the entire structure has low material cost, simple manufacturing process, and small product size, which is conducive to its promotion and application on metallic backgrounds.

[0017] A dual-loop inductive UHF RFID tag includes a dual-loop inductive frame 30, a dual-loop inductive aluminum foil antenna 20, and an UHF chip 10 with a short circuit. Compared to the planar structure of traditional RFID tags, the dual-loop inductive UHF RFID tag of this invention is arranged in a three-dimensional state, and does not cause defects such as large overall structure size and difficulty in installation.

[0018] The dual-loop inductor frame 30 in this invention is made of PP (polypropylene) or ceramic. Different materials result in different sizes of the dual-loop antenna.

[0019] A dual-loop inductive aluminum foil antenna 20 surrounds the dual-loop inductive frame 30 and comprises two separate loops of aluminum foil antennas, forming a two-layer structure. Specifically, the dual-loop inductive aluminum foil antenna 20 includes a first loop of aluminum foil antenna 21 and a second loop of aluminum foil antenna 22, arranged side-by-side to form two vertically distributed ring structures. In this invention, both the first loop of aluminum foil antenna 21 and the second loop of aluminum foil antenna 22 have openings for connection to an ultra-high frequency chip with a short circuit.

[0020] The dual-loop inductive aluminum foil antenna 20 has a double-layer structure, consisting of an aluminum foil layer 20' and a PET base film 20". The aluminum foil layer 20' and the PET base film 20" are laminated together, which has high mechanical strength and facilitates the processing and installation of the dual-loop inductive aluminum foil antenna 20.

[0021] The aluminum foil antenna in this invention unfolds into a sheet shape, and its plane is attached to the surface of the dual-turn inductor frame 30. Specifically, the dual-turn inductor aluminum foil antenna 20 is bonded to the periphery of the dual-turn inductor frame 30, and its front end ( Figure 3 The top of the chip is connected to the ultra-high frequency chip 10, and its rear end ( Figure 3The bottom ends of the first ring of aluminum foil antenna 21 overlap to form a complete first ring of aluminum foil antenna 21, and the bottom ends of the second ring of aluminum foil antenna 22 overlap to form a complete second ring of aluminum foil antenna 22. This makes the processing and installation of the dual-ring inductive aluminum foil antenna 20 more convenient. Since the thickness of the PET bottom film 20” is 50 micrometers, at ultra-high frequency of 900MHz, the resistance of the overlapping part at the rear end of the dual-ring inductive aluminum foil antenna 20 is extremely small, and it conducts with low impedance at 900MHz.

[0022] The UHF chip 10 with short circuit includes two antenna end connection pins and two chip outer short circuit connection pins. The two antenna end connection pins are respectively connected to one end of two aluminum foil antennas, and the other end of the two aluminum foil antennas are respectively connected to the two chip outer short circuit connection pins. The two chip outer short circuit connection pins are connected to each other through the chip outer short circuit.

[0023] Specifically, one end of the first ring of aluminum foil antenna 21 is connected to the first antenna endpoint connection pin 11 of the UHF chip 10 with a short circuit, and the other end is connected to the first chip outer layer short circuit connection pin 12 of the UHF chip 10 with a short circuit; one end of the second ring of aluminum foil antenna 22 is connected to the second antenna endpoint connection pin 13 of the UHF chip 10 with a short circuit, and the other end is connected to the second chip outer layer short circuit connection pin 14 of the UHF chip 10 with a short circuit; the first chip outer layer short circuit connection pin 12 and the second chip outer layer short circuit are short-circuited. None of the line connection pins 14 are connected to the internal circuit of the UHF chip 10 with short circuits. The two are shorted through the chip's outer short circuit 15, forming a double-ring three-dimensional ring structure of "UHF chip 10 with short circuit - first antenna endpoint connection pin 11 - first ring aluminum foil antenna 21 - first chip outer short circuit connection pin 12 - chip outer short circuit 15 - second chip outer short circuit connection pin 14 - second ring aluminum foil antenna 22 - second antenna endpoint connection pin 13 - UHF chip 10 with short circuits", which increases the accuracy of radio frequency reading.

[0024] In this invention, under a metal plate background, the resonant frequency of the ultra-high frequency chip 10 with a short circuit coupled to the dual-loop inductor aluminum foil antenna 20 is 900MHz. This invention has better radio frequency performance under a metal plate background, and is therefore suitable for application in the ultra-high frequency band under a metal background.

[0025] The entire structure of this invention is small, all less than 18mm×8mm×3mm. It is mounted on a long strip of metal, and the edge of the long strip of metal becomes the radio frequency antenna of the dual-turn inductor circuit. The dual-turn inductor circuit is coupled to it to form a radio frequency tag with a larger antenna, which increases the reading distance many times over.

[0026] like Figure 3 , Figure 4As shown, the dual-coil inductive UHF RFID tag is mounted on a metal substrate background, with the UHF chip 10, having a short circuit, positioned away from the metal substrate background 40. In one implementation, the back of the dual-coil inductive UHF RFID tag is connected to the metal substrate background 40 via an adhesive layer 50. In this structure, the dual-coil inductive UHF RFID tag is directly adhered to the surface of the metal substrate background 40, simplifying the manufacturing process. Preferably, the adhesive layer 50 can be made of glue, double-sided tape, epoxy resin, or similar materials as an intermediary for bonding.

[0027] In another implementation, the dual-coil inductive UHF RFID tag is fixed to the surface of the metal plate background 40 via an adhesive layer 51. In this structure, the dual-coil inductive UHF RFID tag can be fixed via the adhesive layer 51, effectively protecting the entire tag. Preferably, epoxy resin can be used as the material for the adhesive layer, as it is low in cost and facilitates processing.

[0028] In other implementation methods, installation and fixation can also be achieved using heat shrink tubing or other methods.

[0029] This invention can be applied in the following situations: (1) Metal cylinders and metal containers: including liquefied gas cylinders, high-pressure gas cylinders, beer kegs, fire extinguisher bottles, oil drums, paint drums, etc.

[0030] (2) Metal packaging occasions: including milk powder cans, tea cans, food cans, and metal bottle caps.

[0031] (3) Metal parts, auto parts, metal building materials, etc.

[0032] (4) Metal tools and other similar applications.

[0033] The technical effects of this invention include: (1) When this invention is applied to metal cylinders and metal containers, it can realize radio frequency identification and positioning of pressure vessels such as cylinders from production, entry and exit from warehouse, transportation, sales and service, and achieve zero error in safety management.

[0034] (2) When this invention is applied to metal parts, auto parts, metal building materials, etc., the radio frequency chip with full-process tracking service in auto parts and other products helps improve the production efficiency of automobiles. It ensures the quality of automobiles and auto parts, and protects the brand of automobiles and auto parts.

[0035] (3) When the present invention is applied to metal packaging, the dual-coil inductor radio frequency resonant cavity assembly of metal-packaged milk powder, tea, high-grade nutritional products and high-end wine can be identified at a glance as genuine or counterfeit. Based on this, it can provide full-process radio frequency identification and positioning for production, warehousing, logistics, sales and service, and realize informatization and intelligence.

[0036] (4) In addition, the dual-circuit inductor radio frequency sensor assembly in this invention has a simple process and does not require special materials, thus having a very high cost performance, greatly reducing the application cost of anti-metal radio frequency tags, and helping the high-pressure vessel industry, the automotive parts manufacturing industry, and the machinery manufacturing industry to promote the application of radio frequency technology and realize a down-to-earth Internet of Things.

Claims

1. A dual-coil inductive ultra-high frequency radio frequency tag, characterized in that, include Dual-turn inductor frame, A dual-loop inductive aluminum foil antenna, wherein the dual-loop inductive aluminum foil antenna is surrounded by a dual-loop inductive frame, and comprises two separate loops of aluminum foil antenna. And an ultra-high frequency chip with a short circuit, which includes two antenna end connection pins and two chip outer short circuit connection pins. The two antenna end connection pins are respectively connected to one end of two aluminum foil antennas, and the other end of the two aluminum foil antennas are respectively connected to the two chip outer short circuit connection pins. The two chip outer short circuit connection pins are connected to each other through the chip outer short circuit.

2. The dual-coil inductive UHF RFID tag according to claim 1, characterized in that, The dual-loop inductive aluminum foil antenna includes a first loop aluminum foil antenna and a second loop aluminum foil antenna, which are arranged side by side.

3. The dual-coil inductive UHF RFID tag according to claim 2, characterized in that, Both the first and second aluminum foil antennas have openings.

4. The dual-coil inductive UHF RFID tag according to claim 1, characterized in that, The dimensions of this dual-coil inductive UHF RFID tag are less than 20mm × 8mm × 2mm.

5. The dual-coil inductive UHF RFID tag according to claim 1, characterized in that, The dual-loop inductor aluminum foil antenna is bonded to the periphery of the dual-loop inductor frame.

6. The dual-coil inductive ultra-high frequency RFID tag according to claim 1, characterized in that, The material of the dual-loop inductor frame is polypropylene or ceramic.

7. The dual-coil inductive ultra-high frequency RFID tag according to claim 1, characterized in that, The resonant frequency of the ultra-high frequency chip with short circuit and the dual-loop inductor aluminum foil antenna is 900MHz.

8. The dual-coil inductive ultra-high frequency RFID tag according to claim 1, characterized in that, The dual-coil inductor UHF RFID tag is mounted on a metal plate background, and the UHF chip with short circuit is positioned away from the metal plate background.

9. The dual-coil inductive ultra-high frequency RFID tag according to claim 8, characterized in that, The back of the dual-coil inductive UHF RFID tag is connected to the metal plate background via an adhesive layer.

10. The dual-coil inductive ultra-high frequency RFID tag according to claim 8, characterized in that, The dual-coil inductive UHF RFID tag is fixed to the background surface of the metal plate using an adhesive layer.

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