A method for preparing an ultra-high frequency RFID optical disc based on conductive transfer printing technology
By forming a nano-micropore array and Koch fractal antenna pattern on an optical disc substrate using conductive transfer technology, the problem of difficult integration of RFID optical discs in existing technologies has been solved, achieving a balance between high adhesion, conductivity and data security, and improving reading distance and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI LVBEN TECH CO LTD
- Filing Date
- 2026-05-14
- Publication Date
- 2026-06-12
AI Technical Summary
Existing RFID optical disc manufacturing technology cannot achieve the integration of UHF RFID functionality with the optical disc body in a low-cost, high-adhesion, and high-durability manner while ensuring the standard physical size of the optical disc. Furthermore, it cannot simultaneously meet the requirements of adhesion, conductivity, and data security. Ordinary UHF antennas experience severe impedance detuning in the near-field environment of the optical disc's metal reflective layer, resulting in a significant reduction in reading distance.
Using conductive transfer technology, a nano-micropore array is formed by surface energy enhancement treatment of polycarbonate optical disc substrate. A conductive transfer paste containing silver nanowires, low-melting-point alloy particles and functionalized polymer anchoring agent is coated to form a Koch fractal antenna pattern. The RFID chip is then bonded and encapsulated through gravure transfer and curing processes, combined with a transparent protective coating.
It achieves a high-adhesion bond between the conductive antenna layer and the optical disc body, the thickness of the antenna layer does not change the standard physical size of the optical disc, it is compatible with existing equipment, the reading distance is improved, the data recording layer remains intact, the production is environmentally friendly and the cost is reduced, and it meets the consistency requirements of industrial production.
Smart Images
Figure CN122197931A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the fields of radio frequency identification technology and optical storage medium manufacturing technology, specifically a method for preparing ultra-high frequency RFID optical discs based on conductive transfer technology. Background Technology
[0002] Optical discs (CDs, DVDs, and Blu-ray discs) use polycarbonate as the main substrate and have a large capacity for optical data storage. They are widely used in fields such as archives management, audio-visual product distribution, and data distribution. With the continuous growth of demand for batch reading and anti-counterfeiting traceability in smart archives, digital copyright management, and warehouse automation, the need to integrate UHF RFID tags into the optical disc body to achieve disc-level unique identification is becoming increasingly urgent.
[0003] Currently, the main methods for adding RFID functionality to optical discs are as follows: The first method is the adhesive label solution, which involves attaching pre-made RFID self-adhesive labels to the surface of the optical disc or around the center hole. This solution has the following drawbacks: the label thickness is increased, which affects the stacking and storage of optical discs in standard optical disc cases; long-term storage can easily lead to the label peeling off and curling up; the label can be separated from the optical disc body by human intervention, making it impossible to achieve unique identification at the disc level; and there is a risk of the label falling off due to centrifugal force when the optical disc rotates at high speed, resulting in insufficient security.
[0004] The second method is to etch a metal antenna, which involves sputtering a metal layer onto the optical disc surface and then etching the antenna pattern using photolithography. This method has the following drawbacks: the process is complicated and the production cost is high; the etching process generates a large amount of chemical waste liquid, which puts great pressure on the environment; the metal layer has poor adhesion to the polycarbonate substrate and is prone to oxidation or peeling; organic solvent slurries corrode the organic recording layer of the optical disc, causing permanent damage to the data stored on the optical disc.
[0005] The third option is the embedded chip solution, which involves embedding the chip and coil into the substrate during the optical disc injection molding process. This solution has the following drawbacks: it requires modification of expensive injection molds, resulting in extremely high initial investment costs; the coil thickness is difficult to control precisely, which can easily lead to excessive flatness of the optical disc and affect the read and write performance of the optical drive; the chip is easily damaged during the high-temperature injection molding process, resulting in a low yield rate.
[0006] The core problem with the existing solutions mentioned above is that they cannot achieve the integration of UHF RFID functionality with the optical disc body in a low-cost, high-adhesion, and high-durability manner while ensuring the standard physical dimensions (thickness and flatness) of the optical disc. Furthermore, none of them can simultaneously meet the requirements of adhesion, conductivity, and data security. Summary of the Invention
[0007] The technical problem to be solved by this invention is that the adhesive tag solution in the existing RFID optical disc manufacturing technology has problems such as poor adhesion, easy detachment, excessive thickness and low security. Etching metal antennas presents challenges such as complex processes, high costs, and the corrosion of the data recording layer by organic solvents. Embedded chip solutions suffer from high mold costs and difficulty in ensuring the flatness of optical discs. None of the above solutions can simultaneously meet the requirements of adhesion, conductivity and data security. Furthermore, ordinary UHF antennas suffer severe impedance detuning in the near-field environment of the optical disc's metal reflective layer, resulting in a significant reduction in reading distance.
[0008] To address the aforementioned technical problems, this invention provides a method for manufacturing ultra-high frequency RFID optical discs based on conductive transfer technology, comprising the following steps: The inner ring region of the polycarbonate optical disc substrate is subjected to surface energy enhancement treatment, so that the surface energy of the inner ring region is increased to more than 60mN / m; A conductive transfer paste containing silver nanowires, low-melting-point alloy particles and functionalized polymer anchoring agent is coated onto a transfer film, and a Koch fractal antenna pattern is formed on the transfer film. The Koch fractal antenna pattern on the transfer film is hot-pressed and transferred to the inner ring area of the polycarbonate optical disc substrate using a gravure transfer method. The transferred antenna pattern is cured at a temperature not exceeding 100°C to form a conductive antenna layer. The RFID chip is bonded to the feed end of the conductive antenna layer by flip-chip bonding using anisotropic conductive adhesive. A transparent protective coating is applied to the conductive antenna layer and the surface of the RFID chip.
[0009] The surface energy enhancement treatment is preferably argon atmospheric pressure plasma micro-etching treatment with a processing power of 150W and a processing time of 60s. After the treatment, a nano-micropore array with a depth of 50nm to 200nm and a pore size of 10nm to 50nm is formed on the surface of the inner ring region of the polycarbonate optical disc substrate, thereby increasing the surface energy of the polycarbonate from the initial approximately 42mN / m to more than 62mN / m.
[0010] The conductive transfer paste is composed of the following: by mass fraction, silver nanowires account for 15% to 25%, the diameter of the silver nanowires is 20nm to 80nm, the aspect ratio is greater than 200, and a continuous conductive network is formed above the percolation threshold. Low-melting-point alloy particles account for 5% to 15%, and the melting point of the low-melting-point alloy particles is below 120°C and the particle size is 1μm to 5μm. During the solidification process, they partially melt at the conductive network nodes, fill the gaps between the silver nanowires, and form metallic welding nodes to significantly reduce contact resistance. The functionalized polymer anchoring agent accounts for 8% to 15%, and the functionalized polymer anchoring agent is maleic anhydride-grafted polyvinyl alcohol with a grafting rate of 8% to 12%. Its hydroxyl end is anchored to the polycarbonate surface through hydrogen bonds, and its maleic anhydride end forms ester bonds with the active sites on the polycarbonate surface under low temperature curing conditions. The organic solvent carrier is in the remainder, and the dynamic viscosity of the conductive transfer paste is 5000 mPa·s to 15000 mPa·s.
[0011] The conductive transfer paste forms an interface bond with the polycarbonate substrate through a three-level composite anchoring mechanism: The first stage is nanomechanical intercalation and anchoring. Under the transfer pressure of 0.1MPa to 0.5MPa, the ends and bending nodes of the silver nanowires are physically embedded in the nanopores of the polycarbonate surface, forming macroscopic mechanical pinning, which contributes the most to the total adhesion. The second level is polymer chemical bond anchoring. The hydroxyl groups in the functionalized polymer anchoring agent form hydrogen bonds with the hydroxyl groups generated by plasma activation on the polycarbonate surface. Under low temperature curing conditions, the maleic anhydride groups form ester bonds with the active sites on the polycarbonate surface, which significantly contributes to the total adhesion. The third level is alloy welding node anchoring. During the curing process, low-melting-point alloy particles form a metallic welding structure around the nano-silver wire nodes embedded in polycarbonate micropores, which further enhances the mechanical interlocking effect and plays an auxiliary role in strengthening adhesion.
[0012] The Koch fractal antenna pattern has an iteration order of 3. The antenna conductive pattern adopts an arc-shaped folded Koch hybrid topology, with each segment of wire generated by the Koch iteration bent and arranged along the Archimedes spiral direction, and the overall layout is within a circular area with a diameter of 33.5 mm. The equivalent electrical length of the 3rd order Koch fractal antenna arm is... satisfy: ; in, The physical length of the 0th order antenna arm is in mm. The equivalent electrical length of the 3rd order Koch fractal antenna arm is expressed in mm. Through fractal iteration, the antenna achieves an equivalent electrical length of approximately 163 mm within a confined space with a diameter of 33.5 mm, satisfying the half-wavelength resonance condition corresponding to the center frequency of 915 MHz in the global UHF band, thus fundamentally resolving the physical contradiction of broadband antennas in confined spaces.
[0013] The Koch fractal antenna pattern also includes a slotted coupling impedance matching network, which is composed of rectangular slots located near the antenna feed region, with a slot width of [missing information]. The gap length is The offset from the feeder center is The gap is equivalent to the series inductive impedance. satisfy: ; in, Free-space wave impedance; The length of the gap is in meters (m). The gap width is in meters (m). The equivalent inductive impedance of the gap, in Ω, is determined through optimization. , , This design enables the slot inductive impedance to compensate for the capacitive impedance shift introduced by the optical disc metal reflector layer, achieving broadband matching of the antenna system with an input reflection coefficient S11 below -10dB in the 860MHz to 960MHz frequency band under CD, DVD, and Blu-ray disc media conditions. In this design, the optical disc metal reflector layer is equivalently modeled as a parasitic radiating element and an equivalent ground plane of the antenna radiation system, realizing the functional transformation from an interference source to a controlled radiator.
[0014] In the hot pressing transfer step, the transfer accuracy is guaranteed by a real-time visual closed-loop control system: continuously acquire images of the transfer area at a frame rate of 500fps, extract the line width deviation and spacing deviation of the antenna conductive pattern, and input the geometric feature deviation into a pre-trained three-layer backpropagation neural network mapping model to predict the antenna impedance offset. The dual judgment conditions are that the line width deviation does not exceed ±5μm and the predicted impedance offset does not exceed ±2Ω. When either judgment condition is not met, the PID controller completes the adjustment of the three-dimensional parameters of transfer pressure, squeegee speed and squeegee contact angle within 100μs. The curing process is only entered after the dual judgment conditions are met for 5 consecutive frames. After each batch is completed, the average value of the process parameters corresponding to all qualified frames in that batch is calculated and used as the initial benchmark parameter for the next batch, so as to achieve self-learning convergence optimization of process parameters across batches.
[0015] The curing process is carried out at a temperature of 80℃ to 100℃ for 10 to 15 minutes, with the curing temperature not exceeding the glass transition temperature of the polycarbonate substrate (approximately 145℃). This effectively protects the optical disc data recording layer. After curing, the sheet resistance of the conductive antenna layer is no greater than 0.1 Ω / sq, and the volume resistivity is no greater than 5 × 10⁻⁶. -5 Ω·cm, peel adhesion is not less than 5N / cm.
[0016] The transparent protective coating is a UV-curable transparent varnish with a thickness of 5μm to 10μm and a UV curing energy density of not less than 800mJ / cm². 2 The conductive antenna layer and RFID chip are completely enclosed within the outline of the optical disc surface, maintaining the original flatness of the optical disc in the overall appearance.
[0017] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows: 1. The conductive antenna is directly integrated into the surface of the optical disc. The thickness of the conductive antenna layer is only 5μm to 20μm, eliminating the thickness of the adhesive layer and base film of traditional labels. It does not change the standard physical size of the optical disc and is fully compatible with existing optical disc libraries, players and automated sorting equipment, solving the stacking and gripping compatibility problems caused by excessive thickness.
[0018] 2. The three-level composite anchoring mechanism enables the conductive antenna layer to peel off and adhere with a force of over 5N / cm, far exceeding the 1N / cm to 2N / cm of traditional adhesive labeling solutions. The antenna can withstand repeated pulling of 3M tape without falling off, and the resistance change rate is less than 5% after 1000 bends. The antenna and the optical disc body are integrated and cannot be separated non-destructively, enabling unique identification binding at the disc level. It is suitable for long-term file preservation and harsh environment applications.
[0019] 3. The transfer process ensures sharp antenna lines and uniform line width, reducing skin effect loss of high-frequency signals. The Koch fractal antenna, combined with the slotted coupling impedance matching network, achieves an S11 of less than -10dB across the entire 860MHz to 960MHz frequency band and a reading distance of no less than 3m under the three optical disc media conditions of CD, DVD and Blu-ray, which is a significant improvement over traditional solutions.
[0020] 4. The conductive transfer paste does not contain corrosive organic solvents, the curing temperature does not exceed 100℃ throughout the process, the polycarbonate substrate does not deform, the original data recording layer of the optical disc is intact, and the optical drive read function is intact.
[0021] 5. It eliminates the need for acid etching and produces no heavy metal waste liquid, meeting RoHS and environmental protection requirements; the conductive ink has a high utilization rate, making it suitable for roll-to-roll high-speed continuous production and significantly reducing the cost per unit.
[0022] 6. The real-time vision closed-loop control system controls the characteristic size tolerance of batch antennas within ±5μm, the impedance fluctuation within ±2Ω, and the batch readout yield is not less than 99%, meeting the consistency quality requirements of industrial-scale production. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of the UHF RFID optical disc based on conductive transfer technology of the present invention. In the figure, ① is the RFID transfer electronic tag and ② is the polycarbonate optical disc substrate. Detailed Implementation
[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.
[0025] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0026] Example 1 Raw material preparation The conductive transfer paste is prepared by mass fraction as follows: 20% silver nanowires (diameter 20nm~80nm, aspect ratio >200), 10% low melting point alloy particles (melting point <120℃, particle size 1μm~5μm), 10% maleic anhydride-grafted polyvinyl alcohol (grafting rate 8%~12%), and the balance of organic solvent; the dynamic viscosity after preparation is 8000mPa·s.
[0027] The optical disc substrate is a standard polycarbonate DVD+R disc, 120mm in diameter and 1.2mm thick, with an organic dye layer pre-coated on the disc surface for data storage.
[0028] The RFID chip used is a UHF RFID chip with a working frequency of 902MHz to 928MHz, which conforms to the EPC Gen2 protocol.
[0029] The transfer film is a polyethylene terephthalate release film with a thickness of 12μm.
[0030] Surface energy enhancement treatment An argon atmospheric pressure plasma micro-etching machine was used, with an argon flow rate of 0.5 L / min, a processing power of 150 W, and a processing time of 60 s. After processing, a nano-micropore array with a depth of 50 nm to 200 nm and a pore size of 10 nm to 50 nm was formed on the inner ring area of the optical disc. The surface energy was increased to above 62 mN / m (tested using a dyne pen). The surface energy was increased to above 60 mN / m, which meets the requirements for the spread and film formation of conductive ink. The processing time was strictly controlled within the specified range. If the processing power was lower than 2.0 kW, the ink would shrink into beads on the surface and would not be able to form a film. If the processing power exceeds 8.0kW, the surface of the optical disc substrate will turn yellow and become brittle, leading to substrate breakage during subsequent bending tests.
[0031] Transfer printing process Take an appropriate amount of the above-mentioned nano-silver conductive ink and coat it evenly on the surface of the corona-treated polyethylene terephthalate transfer film. The coated transfer film is placed in an infrared drying oven and pre-dried at 80°C for 3 minutes to evaporate some of the solvent and form an ink layer with a certain degree of viscoelasticity. A gravure roller with a 3rd-order Koch fractal antenna pattern was prepared using a precision gravure engraving process. The antenna conductive pattern adopts an arc-shaped folded Koch hybrid topology and is arranged in a circular area with a diameter of 33.5 mm. A rectangular slot-open coupling impedance matching network is provided near the feed area. The Koch fractal antenna pattern was transferred to a transfer film using a gravure transfer method. The transfer film with the antenna pattern is placed in a hot press, aligned with the inner surface of the optical disc, and the temperature is set to 120℃, the pressure to 0.3MPa, and the holding time to 5s. The hot press separates the release layer of the transfer film, and the conductive ink layer is completely transferred and embedded into the surface of the optical disc. Peel off the polyethylene terephthalate base film, place the optical disc in a 90°C oven and cure for 12 minutes to further improve conductivity, thus completing the fabrication of the conductive antenna layer.
[0032] The transfer temperature and pressure have a significant impact on the process results: if the temperature is as low as 80℃ and the pressure is as low as 0.5MPa, the transfer film will not be completely released, and some ink will remain on the release film, resulting in missing antenna patterns. If the temperature rises to 180℃ and the pressure rises to 2.0MPa, the optical disc substrate will undergo thermal deformation, with a warping degree greater than 0.5mm. The optical drive will then be unable to read the original data on the disc, and the storage function will fail.
[0033] Chip bonding Anisotropic conductive adhesive is applied to the antenna feed point. The RFID chip is aligned with the feed point using a flip-chip bonding machine and bonded under pressure at 180°C to form an electrical connection. The sheet resistance is no greater than 0.1Ω / sq.
[0034] Protective coating A UV-curable transparent varnish is uniformly sprayed onto the conductive antenna layer and the RFID chip surface, with a thickness controlled between 5μm and 10μm. The surface is then exposed to a UV lamp (illuminance 800mJ / cm²). 2 The process involves solidifying and molding the optical disc, completely enclosing the antenna and chip within the outline of the disc surface.
[0035] Performance Tests and Results Sheet resistance test: The surface resistance of the antenna was measured using a four-probe tester. The sheet resistance was measured to be 0.08Ω / sq, which is better than the requirement of 0.1Ω / sq.
[0036] Adhesion test: 3M 600 tape was tightly adhered to the antenna surface and quickly pulled at a 180° angle, repeated 3 times. The antenna pattern did not peel off or shed powder, and the adhesion met the requirements.
[0037] Bending test: The optical disc is repeatedly bent on a cylinder with a diameter of 10mm. The resistance is measured every 100 bends. After 1000 bends, the resistance value increases from the initial 2.1Ω to 2.2Ω, with a change rate of 4.8%, which is lower than the requirement of 5%.
[0038] Reading performance test: In an interference-free microwave anechoic chamber, using a UHF RFID reader (output power 30dBm), the average reading distance was 5.2m.
[0039] Data integrity verification: Before and after hot pressing (120℃) and curing (90℃) treatments, the error rate of the optical disc was read using an optical disc tester. The error rate before treatment was 20%, and the error rate after treatment was 22%. The data was not damaged, the error rate was within the normal fluctuation range, and the original storage function of the optical disc was intact.
[0040] Example 2 To verify the necessity of the solid content and viscosity parameter range of the conductive ink in this invention, the following comparative experiments were conducted: Using conductive ink with a solid content of 65% and a viscosity of 2000 mPa·s, the antenna lines have clear edges without jagged edges, the adhesion test pass rate reaches 100%, and the reading distance reaches 5.2m.
[0041] Using low-viscosity ink with a solid content of 40% and a viscosity of 500 mPa·s, the ink flow was too strong, resulting in severe smudging, blurred lines, short circuit of the antenna, and inability to read signals during transfer. This verified the fatal impact of excessively low ink viscosity on transfer accuracy.
[0042] Using high-viscosity ink with a solid content of 80% and a viscosity of 5000 mPa·s, the ink was too thick and could not completely fill the template details during transfer, resulting in broken antenna wires and a yield of only 10%, which verified the negative impact of excessively high ink viscosity on the integrity of the transfer.
[0043] The results of the above comparative experiments show that the process parameters of 65% solid content and 2000 mPa·s defined in this invention are necessary conditions for achieving clear transfer of antenna lines and ensuring adhesion and conductivity.
[0044] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims
1. A method for manufacturing ultra-high frequency RFID optical discs based on conductive transfer technology, characterized in that, Includes the following steps: The inner ring region of the polycarbonate optical disc substrate is subjected to surface energy enhancement treatment, so that the surface energy of the inner ring region is increased to more than 60mN / m; A conductive transfer paste containing silver nanowires, low-melting-point alloy particles and functionalized polymer anchoring agent is transferred onto a transfer film using a gravure roller with a Koch fractal antenna pattern, thereby forming a Koch fractal antenna pattern on the transfer film. The Koch fractal antenna pattern on the transfer film is hot-pressed and transferred to the inner ring area of the polycarbonate optical disc substrate using a gravure transfer method. The transferred antenna pattern is cured at a temperature not exceeding 100°C to form a conductive antenna layer. The RFID chip is bonded to the feed end of the conductive antenna layer by flip-chip bonding using anisotropic conductive adhesive. A transparent protective coating is applied to the conductive antenna layer and the surface of the RFID chip.
2. The method according to claim 1, characterized in that, The surface energy enhancement treatment is an argon atmospheric pressure plasma micro-etching treatment with a processing power of 150W and a processing time of 60s. After processing, a nanoporous array with a depth of 50nm to 200nm and a pore size of 10nm to 50nm is formed on the surface of the inner ring region of the polycarbonate optical disc substrate.
3. The method according to claim 1, characterized in that, The conductive transfer paste contains, by mass fraction: 15% to 25% silver nanowires, wherein the diameter of the silver nanowires is 20 nm to 80 nm and the aspect ratio is greater than 200. The low-melting-point alloy particles comprise 5% to 15% of the total content, wherein the melting point of the low-melting-point alloy particles is below 120°C and the particle size is 1 μm to 5 μm. The functionalized polymer anchoring agent is 8%–15%, wherein the functionalized polymer anchoring agent is maleic anhydride-grafted polyvinyl alcohol with a grafting rate of 8%–12%; Organic solvent carrier is the remainder; The dynamic viscosity of the conductive transfer paste is 5000 mPa·s to 15000 mPa·s.
4. The method according to claim 1, characterized in that, The iteration order of the Koch fractal antenna pattern is 3, and the antenna conductive pattern adopts an arc-shaped folded Koch hybrid topology, which is arranged in a circular area with a diameter of 33.5mm. The Koch fractal antenna pattern also includes a slotted coupling impedance matching network located near the antenna feed area. The slotted coupling impedance matching network is composed of rectangular slots. By adjusting the width, length and offset of the rectangular slots from the feed center, the input reflection coefficient S11 of the entire antenna system in the 860MHz to 960MHz frequency band is made to be less than -10dB.
5. The method according to claim 1, characterized in that, The hot press transfer pressure is 0.1MPa to 0.5MPa, the transfer temperature is 80℃ to 120℃, and the holding time is 3s to 10s.
6. The method according to claim 1, characterized in that, The hot pressing transfer step also includes real-time visual closed-loop control of the transfer accuracy: image acquisition of the transfer area at a frame rate of 500fps, extraction of line width deviation and spacing deviation of the antenna conductive pattern, and input of the line width deviation and spacing deviation into a pre-trained backpropagation neural network mapping model to predict the antenna impedance offset. The dual criteria are that the line width deviation does not exceed ±5μm and the predicted impedance offset does not exceed ±2Ω. If either criterion is not met, the transfer pressure, squeegee speed and squeegee contact angle are adjusted by the PID controller until the dual criteria are met for 5 consecutive frames before the curing process begins.
7. The method according to claim 1, characterized in that, The curing temperature is 80℃~100℃, and the curing time is 10min~15min; After curing, the sheet resistance of the conductive antenna layer is no greater than 0.1Ω / sq, and the peel adhesion is no less than 5N / cm.
8. The method according to claim 1, characterized in that, The transparent protective coating is a UV-cured transparent varnish with a thickness of 5μm to 10μm and a UV curing energy density of not less than 800mJ / cm².
9. An ultra-high frequency RFID optical disc, characterized in that, Prepared by the method of any one of claims 1 to 8, the ultra-high frequency RFID optical disc comprises: A polycarbonate optical disc substrate, wherein the inner ring region surface of the polycarbonate optical disc substrate has an array of nanopores; A conductive antenna layer is transferred and cured onto the surface of the inner ring region by conductive transfer paste. The pattern of the conductive antenna layer is a Koch fractal antenna, and the thickness is 5μm to 20μm. The RFID chip is bonded to the feed terminal of the conductive antenna layer by flip-chip bonding using anisotropic conductive adhesive. A transparent protective coating covers the conductive antenna layer and the RFID chip.
10. The UHF RFID optical disc according to claim 9, characterized in that, The conductive antenna layer also includes a slotted coupling impedance matching network, which is composed of rectangular slots located near the antenna feed area. The width, length, and offset of the rectangular slots from the feed center are determined according to the metal reflective layer parameters corresponding to the type of optical disc to which the polycarbonate optical disc substrate belongs. This ensures that the overall antenna system meets the requirement that the input reflection coefficient S11 is less than -10dB in the 860MHz to 960MHz frequency band under the three media conditions of CD, DVD, and Blu-ray optical discs.