Copper wire sewing thread ultra-high frequency antenna and manufacturing method
Through the innovative design of the copper wire sewing thread UHF antenna, the problems of high cost, washability, and ironing resistance of existing UHF RFID tags in the footwear and apparel industry have been solved, realizing the application of low-cost and environmentally friendly UHF antennas and improving the level of information management.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- JIAO LIN
- Filing Date
- 2025-01-06
- Publication Date
- 2026-07-09
AI Technical Summary
Existing UHF RFID tags are expensive in the footwear and apparel industry, and are not resistant to washing and ironing. Traditional materials and processes pollute the environment and are also expensive. Carbon fiber antennas are expensive and have complex processes, so they cannot be widely used.
The UHF antenna is made by twisting bare copper wire and sewing thread together to form a copper wire sewing thread, which is then sewn onto the label fabric substrate. Combined with high-speed sewing machine technology, process standards are established to ensure high sensitivity and low cost.
It has achieved a low-cost, environmentally friendly ultra-high frequency antenna that is water-resistant, fold-resistant, and iron-resistant, reducing manufacturing costs, providing full-process information tracking services for the footwear and apparel industry, and promoting the application of radio frequency technology in more fields.
Smart Images
Figure CN2025070692_09072026_PF_FP_ABST
Abstract
Description
A copper wire sewing thread ultra-high frequency antenna and its manufacturing method Technical Field
[0001] This invention relates to the field of ultra-high frequency antenna technology, specifically to a copper wire sewing thread ultra-high frequency antenna material, and a method for manufacturing ultra-high frequency antennas using a sewing machine. Background Technology
[0002] The market for UHF RFID tags in the footwear and apparel industry is developing rapidly, with a global annual consumption of nearly 10 billion pieces. The mainstream RFID tag products in the footwear and apparel industry are paper tags and hang tags, with a small amount being washable RFID tags. However, all different RFID tags have many drawbacks.
[0003] 1. Current Deficiencies in the Application of UHF Paper Labels and Hang Tags in the Footwear and Apparel Industry
[0004] A: Paper tags are not suitable for washing footwear and apparel products and can only be used in warehousing, logistics, and sales. Consumers discard the RFID paper tags immediately after purchasing footwear and apparel. Furthermore, paper tags are not suitable for the washing process of footwear and apparel, and therefore cannot provide product information tracking and traceability for the footwear and apparel industry. The footwear and apparel industry has not achieved full-process product tracking services.
[0005] B: UHF paper labels have a four-layer structure: a surface paper layer, an inlay layer, a pressure-sensitive adhesive layer, and a release paper layer. Due to high manufacturing costs, only large apparel companies can currently afford them. Many footwear and apparel companies, considering costs, have not adopted UHF labels and hangtags on their products, thus failing to achieve information management for every single item.
[0006] C: The need to reduce the cost of UHF paper tags: The chips, paper, and adhesives of UHF paper tags are the basic costs that tag manufacturers cannot change. The only thing that can be improved is the material and process of UHF antennas. Traditional PET aluminum foil composite film involves multiple processes such as optical plate making, chemical etching, and water washing, which is not only costly, but also generates a lot of waste liquid and wastewater, polluting the environment. There is an urgent need for an innovative UHF antenna material and antenna manufacturing process.
[0007] D: The mounting method of the UHF antenna on the label substrate determines the practicality of RFID tags in various application scenarios: UHF tags for the footwear and apparel industry need to be washable and ironable, requiring the label substrate to be changed from paper to high-temperature resistant fabric. The traditional inlay process, which uses pressure-sensitive adhesive to adhere the label to paper, is not suitable for washing and ironing scenarios, necessitating an innovative mounting method between the UHF antenna and the fabric label substrate.
[0008] 2. Current Status and Shortcomings of Water-Resistant Ultra-High Frequency Fabric Laundry Labels
[0009] Unlike paper RFID tags, the ultra-high frequency (UHF) antenna in washable UHF cloth laundry labels is made of multi-strand carbon fiber. Because the diameter of the carbon fiber antenna material is greater than 0.5mm, it can only be formed into an approximately sinusoidal UHF antenna by coiling on the label fabric substrate, and then fixed to the label fabric with sewing thread. This necessitates resistance to washing, folding, pressure, and ironing. However, the high cost of carbon fiber and the complex process of coiling it into an approximately sinusoidal antenna are the reasons for the high price of laundry labels, hindering their widespread application.
[0010] Therefore, there is an urgent need for conductive fiber materials that can replace carbon fiber, processes for manufacturing ultra-high frequency antennas, and a solution for connecting conductive fiber antennas to the label fabric substrate. Summary of the Invention
[0011] To overcome the shortcomings of existing technologies, this invention provides a copper wire sewing thread ultra-high frequency antenna and its manufacturing method.
[0012] The technical solution of this invention is as follows:
[0013] A copper wire sewing thread ultra-high frequency antenna includes a copper wire sewing thread, which is formed by twisting bare copper wire and sewing thread together; the copper wire sewing thread is sewn onto a label fabric substrate to form a copper wire sewing thread ultra-high frequency antenna.
[0014] The diameter of bare copper wire ranges from 0.06 mm to 0.07 mm, with 0.06 mm diameter bare copper wire being called annealed copper wire, which has good flexibility. The diameter of sewing thread is 0.12 mm; the diameter of copper wire sewing thread is less than 0.2 mm. The twist of bare copper wire and sewing thread when twisted together is greater than 400, which can ensure a smooth sewing process without thread breakage.
[0015] The resistance of each meter of copper wire sewing thread is less than 7.5 ohms, the resistance of the entire copper wire sewing thread UHF antenna is less than 2.5 ohms, and the tensile strength is greater than 10N.
[0016] Copper wire sewing thread can be sewn onto the label fabric substrate simultaneously with the sewing bobbin thread, so that one side of the label fabric substrate has the sewing track of copper wire sewing thread: if a straight sewing track is selected, the length of the copper wire sewing thread track is 100 mm to 120 mm; if a zigzag or square wave sewing track is selected, the length of the copper wire sewing thread track is 60 mm to 90 mm.
[0017] Copper wire sewing thread can also be sewn separately onto the label fabric substrate, so that both the upper and lower surfaces of the label fabric substrate have the sewing track of copper wire sewing thread: the length of the sewing track of copper wire sewing thread with a straight sewing track is 80 mm to 90 mm.
[0018] A method for manufacturing a copper wire sewing thread ultra-high frequency antenna includes: (1) selecting bare copper wire and sewing thread, and twisting them together to form a copper wire sewing thread; (2) determining whether to use copper wire sewing thread alone to sew the ultra-high frequency antenna, or to use copper wire sewing thread and sewing thread simultaneously to sew the ultra-high frequency antenna; (3) determining the stitch trajectory (straight line, sawtooth, wave pattern, sine wave, combination pattern, etc.), stitch distance, and sewing length; (4) sewing copper wire sewing thread onto a label fabric substrate to form an ultra-high frequency antenna.
[0019] After sewing is completed, the process also includes determining the standard specifications for the manufacturing process of UHF antennas: sewing UHF antennas with different parameters separately and measuring their sensitivity; based on the measured recognition sensitivity of the UHF antennas, changing the stitch trajectory, stitch spacing, and sewing length to obtain the sewing parameters at the optimal recognition sensitivity, and formulating the process standards for sewing antennas.
[0020] According to the above-described solution, the beneficial effects of this invention are as follows: the copper wire sewing thread ultra-high frequency antenna of this invention has good conductivity, small diameter, high tensile strength, and good flexibility. When the ultra-high frequency antenna is sewn onto fabric material by a high-speed sewing machine, it has the advantages of being washable, folding and pressing resistant, ironing resistant, and having high production efficiency. Its production cost is only 1 / 6 of the cost of traditional PET aluminum foil chemical etching antennas and 1 / 120 of the production cost of existing carbon fiber antennas. This is conducive to promoting the widespread application of radio frequency technology in the footwear, linen, and handbag industries and improving the level of information management. Attached Figure Description
[0021] Figure 1a is a schematic diagram of an ultra-high frequency antenna with a bottom copper wire sewing thread;
[0022] Figure 1b is a schematic diagram of a bottomless copper wire sewing thread ultra-high frequency antenna;
[0023] Figure 2 is a comparative diagram of the diameter, conductivity and sewing adaptability of various thread materials;
[0024] Figure 3a is a schematic diagram of a sawtooth copper wire sewing thread ultra-high frequency antenna;
[0025] Figure 3b is a schematic diagram of a trapezoidal copper wire sewing thread ultra-high frequency antenna;
[0026] Figure 3c is a schematic diagram of a square-wave copper wire sewing thread ultra-high frequency antenna;
[0027] Figure 3d is a schematic diagram of an approximately sinusoidal copper wire sewing thread ultra-high frequency antenna;
[0028] Figure 3e is a schematic diagram of a combined copper wire sewing thread ultra-high frequency antenna;
[0029] Figure 4 is a schematic diagram of a radio frequency tag with antenna wings formed by coupling a copper wire sewing thread ultra-high frequency antenna with a miniature dual-coil radio frequency resonant cavity assembly.
[0030] Figure 5 is a schematic diagram of an RFID tag with antenna wings, which is formed by coupling a copper wire sewing thread UHF antenna with a single-turn RF resonant cavity assembly.
[0031] In the figure, the labels for each item are as follows:
[0032] 1. Copper wire sewing thread; 2. Sewing bobbin thread; 3. Upper label fabric; 4. Lower label fabric; 5-1. Miniature dual-coil radio frequency resonant cavity assembly; 5-2. Single-turn radio frequency resonant cavity assembly. Detailed Implementation
[0033] The present invention will now be further described with reference to the accompanying drawings and embodiments:
[0034] As shown in Figures 1a to 5, in order to solve the defects of existing UHF RFID tags in industries such as footwear and apparel, such as high cost and poor resistance to washing and ironing, this invention proposes a copper wire sewing thread UHF antenna, which is formed by sewing copper wire sewing thread 1 onto the label fabric substrate.
[0035] The copper wire sewing thread 1 is formed by twisting bare copper wire and sewing thread together. To ensure the basic performance of the copper wire sewing thread 1 in manufacturing an ultra-high frequency antenna, the diameter of the bare copper wire selected in this invention is 0.06 mm to 0.07 mm, where the bare copper wire with a diameter of 0.06 mm is called annealed copper wire, which has better flexibility. The diameter of the sewing thread selected in this invention is 0.12 mm.
[0036] The label fabric substrate can be a single-layer fabric label or a double-layer fabric label (e.g., upper label fabric 3 and lower label fabric 4).
[0037] During the fabrication of the copper wire sewing thread 1, the twist rate when the bare copper wire and the sewing thread are twisted together is greater than 400, ensuring a smooth sewing process and preventing thread breakage. In this invention, the resistance per meter of the copper wire sewing thread 1 is less than 7.5 ohms, and the resistance of the entire UHF antenna is less than 2.5 ohms. The diameter of the copper wire sewing thread 1 is less than 0.2 mm, and its tensile strength is greater than 10 N, meeting the basic performance requirements for fabricating an UHF antenna.
[0038] As shown in Figures 3a to 3e, in this invention, the sewing trajectory of the copper wire sewing thread 1 to form the ultra-high frequency antenna can be: sawtooth shape, trapezoidal shape, wave shape, approximately sine wave shape, or a combination of the above shapes. The specific selection can be made according to different needs.
[0039] As shown in Figure 1a, in this invention, the copper wire sewing thread 1 and the sewing thread bottom thread 2 are sewn simultaneously onto the label fabric substrate, so that one side surface of the label fabric substrate has the sewing trajectory of the copper wire sewing thread 1. During the sewing process, the copper wire sewing thread 1 located on the upper side of the label fabric substrate and the sewing thread bottom thread 2 located on the lower side of the label fabric substrate cross and wrap around each other. After wrapping, the copper wire sewing thread 1 and the sewing thread bottom thread 2 move forward respectively.
[0040] Based on this stitching method, the length of the stitching path of the copper wire sewing thread 1 with a straight stitching path is 100 mm to 120 mm; the length of the stitching path of the copper wire sewing thread 1 with a serrated or square wave stitching path is 60 mm to 90 mm.
[0041] As shown in Figure 1b, in this invention, the copper wire sewing thread 1 can also be sewn separately onto the label fabric substrate, so that both the upper and lower surfaces of the label fabric substrate have the sewing trajectory of the copper wire sewing thread 1. During the sewing process, the copper wire sewing thread 1 passes downward through the label fabric substrate at the current stitch position and extends from the previous stitch, then wraps forward, turns back to the next stitch position, and passes through the current stitch position. After passing through, the copper wire sewing thread 1 runs along the upper surface to the next stitch position and passes downward, passes through the copper wire sewing thread 1 on the lower side of the label fabric substrate, and then wraps forward.
[0042] Based on this stitching method, since the copper wire sewing thread 1 leaves sewing tracks on both the upper and lower surfaces of the label fabric substrate, and the sewing track on the lower side of the label fabric substrate consists of two copper wire sewing threads 1, the sewing length based on this stitching method is shorter than the stitching length with a bottom thread in the previous embodiment. Specifically, the length of the sewing track of the straight copper wire sewing thread 1 is 80 mm to 90 mm.
[0043] A method for manufacturing a copper wire sewing thread ultra-high frequency antenna includes:
[0044] S1. Select bare copper wire and sewing thread, and twist them together to form copper wire sewing thread;
[0045] S2. Determine whether to use copper wire sewing thread alone to sew the UHF antenna, or to use copper wire sewing thread and sewing bobbin thread to sew the UHF antenna at the same time.
[0046] S3. Determine the stitch path, stitch spacing, and sewing length;
[0047] S4. Sew copper wire sewing thread onto the label fabric substrate to form an ultra-high frequency antenna.
[0048] After sewing is completed, the process also includes determining the standard specifications for the manufacturing process of UHF antennas: first, UHF antennas with different parameters are sewn separately and sensitivity measurements are taken; then, based on the measured recognition sensitivity of the UHF antennas, the stitch trajectory, stitch spacing, and sewing length are changed to obtain the sewing parameters at the optimal recognition sensitivity, and the process standards for sewing antennas are formulated.
[0049] As shown in Figures 1a, 1b, 4, and 5, in this invention, the ultra-high frequency antenna made of copper wire can be combined with different radio frequency resonant cavities and radio frequency chips to form a complete RFID tag. In specific implementation, the ultra-high frequency antenna can be coupled with the radio frequency resonant cavity and radio frequency chip and then directly encapsulated between the upper label fabric and the lower label fabric 4 to form an RFID tag. Alternatively, the radio frequency resonant cavity can be coupled to the radio frequency chip and then wrapped between the upper label fabric 3 and the lower label fabric 4. The upper label fabric 3 and the lower label fabric 4 are then sewn together using copper wire, completing the coupling between the ultra-high frequency antenna and the radio frequency resonant cavity, thereby forming an RFID tag.
[0050] Specifically, in Figure 4, a sinusoidal UHF antenna is connected to a miniature dual-coil RF resonator assembly 5-1 (including the dual-coil RF resonator and the RF chip) to form an RFID tag with antenna wings. In Figure 5, a sawtooth-shaped UHF antenna is coupled to a single-turn RF resonator assembly 5-2 (including the single-turn RF resonator and the RF chip) to form an RFID tag with antenna wings.
[0051] When using sewing techniques to manufacture UHF antennas, the requirements for antenna materials include:
[0052] (1) Electrical conductivity
[0053] Meeting the conductivity requirements of UHF antennas is one of the important conditions for fabricating UHF antenna materials. The performance of UHF antennas is evaluated by their quality factor. The quality factor of an UHF antenna is Q = 2πfL / R, where f is the frequency of the UHF signal, L is the equivalent inductance of the UHF antenna, and R is the resistance of the UHF antenna.
[0054] In practice, when the resistance of an UHF antenna is greater than 2.5 ohms, the sensitivity of the UHF antenna begins to decrease. Therefore, the resistance of the UHF antenna should be below 7.5 ohms per meter.
[0055] (2) Diameter
[0056] When sewing an UHF antenna onto a label substrate using a sewing process, the diameter of the conductive fiber or other thread must be less than 0.2mm. It is also necessary to ensure that sewing, whether with or without a bobbin, will not affect the normal operation of the sewing machine.
[0057] (3) Tensile strength
[0058] The tensile strength of the ultra-high frequency antenna material is greater than 9.5N, which allows it to remain unbroken on a high-speed industrial sewing machine.
[0059] (4) Adaptability of sewing buttons
[0060] The flatness of the antenna sewn onto the label fabric is affected by the softness of the antenna material, requiring the conductive fiber to have a softness similar to that of 402 / S fine sewing thread.
[0061] Figure 2 compares the performance of sewing thread, copper wire, copper wire sewing thread, covered thread, conductive fiber, carbon fiber, and multi-strand carbon fiber in terms of diameter, conductor properties, and sewing adaptability. As can be seen from the figure:
[0062] As shown by the solid dots in Figure 2, in terms of conductivity, copper wire, copper wire sewing thread, yarn-covered thread, and multi-strand carbon fiber all meet the standards. As shown by the solid triangles in Figure 2, in terms of diameter, the diameters of copper wire, copper wire sewing thread, conductive fiber, and single-strand carbon fiber are all less than 0.2 mm. As shown by the hollow circles in Figure 2, in terms of sewing adaptability, sewing thread, copper wire sewing thread, and conductive fiber have good sewing characteristics.
[0063] The comparison shows that:
[0064] (1) Conductive fibers made by electroplating or coating conductive layers on fiber surfaces have poor conductivity: due to the high resistivity of vacuum coating on fiber surfaces and single-strand carbon fibers, the resistance per meter is much greater than 7.5 ohms. Therefore, they are suitable for making antistatic fabrics and electromagnetic shielding fabrics, but cannot be used to sew ultra-high frequency antennas.
[0065] (2) The thin copper wire with a diameter of 0.06 mm has poor tensile strength: The thin copper wire with a diameter of 0.06 mm has good conductivity and softness, but its tensile strength is less than 1N, which makes it very easy to break during sewing. It is impossible to use a high-speed sewing machine to mass-produce ultra-high frequency antennas on fabric.
[0066] (3) The sewing characteristics of the cotton-coated wire are poor: the electrical conductivity and tensile strength of the cotton-coated wire meet the standards, but its diameter is greater than 0.2mm, its softness is poor, and the surface of the sewn UHF antenna is obviously raised, making it impossible to mass-produce UHF antennas on a high-speed sewing machine.
[0067] In summary, this invention uses copper wire sewing thread to manufacture ultra-high frequency antennas for ultra-high frequency tags in the footwear and apparel industry.
[0068] The copper wire sewing thread ultra-high frequency antenna of the present invention has the following application characteristics and advantages:
[0069] (1) Ultra-high frequency performance
[0070] The copper wire sewing thread ultra-high frequency antenna of the present invention has high radio frequency identification sensitivity, and its bandwidth can be up to 100MHz within a -2dB bandwidth.
[0071] (2) Cost
[0072] 10,000 yards of 402 high-speed sewing thread costs 3 yuan, and each meter of high-speed sewing thread costs 0.0004 yuan; 0.06 mm bare copper wire costs 0.005 yuan per meter. The cost of twisting the bare copper wire with the sewing thread is 50% of the price of the sewing thread and copper wire. Therefore, the material and twisting cost per meter of copper wire sewing thread is 0.0054 × 1.5 = 0.0081 yuan (this cost may fluctuate depending on market prices; this is just an example).
[0073] Considering the loss, each meter of sewing thread is used to make 3 UHF antennas, and the material cost of each antenna is 0.0027 yuan, meaning the material cost of making each UHF antenna is 2.7 fen (0.0027 yuan). This cost is 1 / 6 of the cost of making UHF antennas using traditional PET composite aluminum foil chemical etching, and 1 / 120 of the cost of carbon fiber UHF antennas.
[0074] (3) Environmental protection and efficiency
[0075] Compared with PET aluminum foil UHF antennas and multi-strand carbon fiber UHF antennas using chemical etching processes, the copper wire sewing thread UHF antenna of this invention has five major advantages: (1) Environmentally friendly, without chemical etching processes, and does not generate waste liquid or wastewater; (2) The antenna is sewn onto the label cloth, making it water-resistant, fold-resistant, and iron-resistant; (3) High production efficiency; (4) It is more convenient and faster to change the pattern and size of the UHF antenna; (5) Enterprises with sewing machines can make UHF antennas and corresponding RFID tags on their products themselves.
[0076] The contribution of the copper wire sewing thread UHF antenna of this invention to RFID tag applications in the laundry, footwear and apparel, handbag, home textile, and fabric packaging industries:
[0077] A. This invention replaces the carbon fiber UHF antenna of the radio frequency (RF) laundry tag with a copper wire sewing thread UHF antenna, significantly reducing manufacturing costs. This promotes the adoption of RF laundry tags in the laundry and linen industries, enabling automatic identification, error correction, and automatic statistics at each process node, including receiving, washing, ironing, sorting, and delivery. This reduces personnel, lowers costs, increases efficiency, and eliminates errors, allowing labor-intensive laundry and linen industries to upgrade to information-based management.
[0078] B. The method for manufacturing ultra-high frequency antennas using copper wire sewing thread of the present invention has created a new way for manufacturers in the garment, footwear, home textile, and handbag industries to manufacture their own fabric RFID tags. This allows all companies with sewing machines to use copper wire sewing thread to manufacture ultra-high frequency antennas, which are then coupled together with an RF resonant cavity assembly to manufacture fabric RFID tags. This significantly reduces the cost of RFID tag manufacturing and promotes the application and popularization of RFID technology.
[0079] C. The price of cloth RFID tags used in this invention is lower than that of paper RFID tags, which is beneficial for the footwear and apparel industry to upgrade from paper tags to cloth RFID tags. This allows the application of RFID technology to expand from warehousing and sales to washing and usage tracking services, promoting the adoption of RFID technology in the footwear, apparel, linen, and handbag industries, and improving information management.
[0080] D. Some industries that provide cloth packaging, such as long-distance transportation and logistics, as well as manufacturers of ton bags, express and postal container bags, and tobacco leaf binding straps, are limited by the high price of traditional cloth RFID tags and have been unable to provide RFID tags for cloth packaging. This invention, however, uses copper wire sewing thread to make UHF antennas, allowing these companies to manufacture low-cost UHF tags on their products, thus promoting the informatization of management in the long-distance transportation and logistics industries.
Claims
1. A copper wire sewing thread ultra-high frequency antenna, characterized in that, Includes copper wire sewing thread, which is formed by twisting bare copper wire and sewing thread together; The copper wire sewing thread is sewn onto the label fabric substrate to form a copper wire sewing thread ultra-high frequency antenna.
2. The copper wire sewing thread ultra-high frequency antenna according to claim 1, characterized in that, The diameter of the sewing thread is 0.12 mm.
3. The copper wire sewing thread ultra-high frequency antenna according to claim 1, characterized in that, The resistance of the copper sewing thread is less than 7.5 ohms per meter.
4. The copper wire sewing thread ultra-high frequency antenna according to claim 1, characterized in that, The copper wire sewing thread and the bottom thread are sewn onto the label fabric substrate simultaneously, so that one side surface of the label fabric substrate has the sewing trajectory of the copper wire sewing thread.
5. The copper wire sewing thread ultra-high frequency antenna according to claim 4, characterized in that, The length of the copper wire sewing thread in the straight sewing trajectory is 100 mm to 120 mm.
6. The copper wire sewing thread ultra-high frequency antenna according to claim 4, characterized in that, The sewing track length of the copper wire sewing thread with a zigzag or square wave sewing track is 60 mm to 90 mm.
7. The copper wire sewing thread ultra-high frequency antenna according to claim 1, characterized in that, The copper wire sewing thread is sewn separately onto the label fabric substrate, so that the upper and lower surfaces of the label fabric substrate have the sewing trajectory of the copper wire sewing thread.
8. The copper wire sewing thread ultra-high frequency antenna according to claim 7, characterized in that, The length of the copper wire sewing thread in the straight sewing trajectory is 80 mm to 90 mm.
9. A method for manufacturing a copper wire sewing thread ultra-high frequency antenna, characterized in that, include: S1. Select bare copper wire and sewing thread, and twist them together to form copper wire sewing thread; S2. Determine whether to use the copper wire sewing thread alone to sew the UHF antenna, or to use the copper wire sewing thread and sewing base thread to sew the UHF antenna at the same time. S3. Determine the stitch path, stitch spacing, and sewing length; S4. Sew copper wire sewing thread onto the label fabric substrate to form an ultra-high frequency antenna.
10. The method for manufacturing a copper wire sewing thread ultra-high frequency antenna according to claim 9, characterized in that, After sewing is completed, the process also includes determining the standard specifications for the manufacturing process of UHF antennas: sewing UHF antennas with different parameters separately and measuring their sensitivity. Based on the measured recognition sensitivity of the UHF antenna, the stitch trajectory, stitch spacing, sewing length, and bare copper wire size are changed to obtain the sewing parameters at the optimal recognition sensitivity, and the process standard for sewing antennas is formulated.