Packaging structure containing ultrahigh frequency RFID tag, method, system and medium

Abstract

The invention discloses a packaging structure containing an ultrahigh frequency RFID tag, a method, a system and a medium. Relates to the technical field of RFID package design. According to the scheme, the n gaps with the specific size are formed in the single face or multiple faces of the metal layer of the packaging box; the equivalent impedance of the matched antenna of the gap is estimated according to the information of the ultrahigh frequency RFID tag and the information of the packaging box; calculating the optimal matching antenna size which enables the matching antenna model to meet the matching antenna equivalent impedance; performing gap layout on the packaging box according to the optimal matching antenna size to obtain gap parameters; according to the scheme, on the basis of a traditional RFID metal packaging technology, the packaging structure level and the design method level are improved; the size of the gap with the specific size is determined by the wavelength of the ultrahigh-frequency RFID tag; the opening position of the gap is determined by the target identification distance, the size of the gap, the size of the packaging box and the position of the ultrahigh frequency RFID tag in the packaging box; not only is an energy and data transmission channel formed and antenna conversion realized, but also multi-directional accurate and stable transmission of RFID data and energy is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of RFID packaging design, and in particular to a packaging structure, method, system and medium containing an ultra-high frequency RFID tag. Background Art

[0002] In passive UHF RFID technology, energy transfer and data interaction are carried out in the form of electromagnetic radiation. Metal has a great interference on electromagnetic radiation signals. When electromagnetic radiation signals encounter metal, they not only cannot penetrate the metal, but also produce reflections. The reflected signals interfere with the normal signals, thus affecting the normal operation of RFID tags.

[0003] For products packaged with metal materials or containing metal components, the existing technology mainly solves the reflection problem through anti-metal label technology. The anti-metal label technology designs the label as a double-layer structure with two layers of antennas. Foam or plastic is filled between the double-layer antennas. The first layer of antenna is used to receive and send signals, and the UHF RFID chip is bound to the first layer of antenna; the second layer of antenna is used as a reflector, and the reflected signal is reduced so as not to interfere with the normal signal through the antenna parameter structure design and the specific double-layer antenna spacing; however, the existing anti-metal label technology is limited to a specific area in the reading direction, and the metal packaging material will still reflect the signal; because the label is a double-layer structure, the thickness is generally 1mm-2mm, which affects the normal use and packaging effect of the product; it cannot be used for products with smaller units inside the whole box packaging, and they need to be unpacked for identification, which affects the efficiency of cargo management, tracing, logistics management, inventory and other work.

[0004] When ultra-high frequency RFID technology (frequency range is usually 860MHz to 960MHz) is applied to metal packaging or packaging containing metal components, the metal packaging material will interfere with or hinder the electromagnetic radiation signal, affecting the normal operation of the ultra-high frequency RFID tag; in the existing packaging technology, openings are set on the metal packaging material to maintain the transmission of electromagnetic radiation signals, but the opening method of this method is relatively arbitrary, ignoring the influence of the size and position of the opening on the transmission of the electromagnetic radiation signal, limiting the transmission effect of the electromagnetic radiation signal. Summary of the invention

[0005] The technical problem to be solved by the present invention is: when ultra-high frequency RFID technology (frequency range is usually 860MHz to 960MHz) is applied to metal packaging or packaging containing metal components, the existing packaging technology maintains the transmission of electromagnetic radiation signals by opening an opening on the metal packaging material, but the opening method of this method is relatively arbitrary, ignoring the influence of the size and position of the opening on the transmission of the electromagnetic radiation signal, limiting the transmission effect of the electromagnetic radiation signal; the purpose of the present invention is to provide a packaging structure, method, system and medium containing an ultra-high frequency RFID tag, and improve the packaging structure level and design method level on the basis of traditional RFID metal packaging technology; by opening a gap of a specific size on one side or multiple sides of the metal layer of the packaging box, the size of the gap is determined by the wavelength of the ultra-high frequency RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the packaging box size and the position of the ultra-high frequency RFID tag in the packaging box; not only a transmission channel for energy and data is formed, but also the metal layer with a gap of a specific size is converted into an antenna, thereby realizing the multi-directional stable transmission of RFID data and energy.

[0006] The present invention is achieved through the following technical solutions:

[0007] This solution provides a packaging structure with an ultra-high frequency RFID tag, including:

[0008] A packaging box containing a metal layer, used to enclose one or more target products;

[0009] An ultra-high frequency RFID tag is used to carry information of a target product; the ultra-high frequency RFID tag is attached to the corresponding target product in the packaging box;

[0010] One or more surfaces of the metal layer are provided with n gaps of specific size; n≥1.

[0011] Working principle of this scheme: UHF RFID technology (frequency range is usually 860MHz to 960MHz) is applied to the existing metal packaging technology to maintain the transmission of electromagnetic radiation signals by opening the metal packaging material, but the opening method of this method is relatively arbitrary, ignoring the influence of the size and position of the opening on the transmission of electromagnetic radiation signals, limiting the transmission effect of electromagnetic radiation signals; the purpose of the present invention is to provide a packaging structure, design method, system and medium with an RFID tag, and to improve the packaging structure level and design method level on the basis of traditional RFID metal packaging technology; by opening a gap of a specific size on one side or multiple sides of the metal layer of the packaging box, the size of the gap is determined by the wavelength of the UHF RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the packaging box size and the position of the UHF RFID tag in the packaging box; not only a transmission channel for energy and data is formed, but also the metal layer with a gap of a specific size is converted into an antenna, thereby realizing the multi-directional stable transmission of RFID data and energy.

[0012] The metal layer in this solution mainly refers to the current layer of the packaging box being completely composed of metal materials (such as Wuxi steel plate), or the entire layer containing metal components (such as metal cardboard, coated steel plate, etc.);

[0013] A further optimization scheme is that the gap is rectangular; the size of the gap is determined by the wavelength of the UHF RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the packaging box size and the position of the UHF RFID tag in the packaging box.

[0014] A further optimization scheme is that when it is determined to open a gap on a single-sided metal layer of the packaging box, the gap opening surface is the surface of the packaging box that is parallel to the plane where the RFID tag is located and is closest to the plane where the RFID tag is located.

[0015] The present invention also provides a method for designing a packaging structure containing an ultra-high frequency RFID tag, which is used to obtain the above-mentioned packaging structure containing an ultra-high frequency RFID tag. The method comprises:

[0016] Get the packaging box information and UHF RFID tag information;

[0017] Estimate the matching antenna equivalent impedance of the gap based on the UHF RFID tag information and the packaging box information;

[0018] Preset a matching antenna width threshold range, and build a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and calculate the optimal matching antenna size that enables the matching antenna model to meet the matching antenna equivalent impedance;

[0019] The slots are laid out on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening positions and slot sizes.

[0020] A further optimization scheme is to estimate the matching antenna equivalent impedance of the gap according to the UHF RFID tag information and the packaging box information; including the method:

[0021] The required resistance of the feed end is obtained according to the working wavelength of the UHF RFID tag;

[0022] Substitute the required resistance of the feed end into the following formula to calculate the equivalent impedance of the matching antenna:

[0023]

[0024] Among them, Z1 represents the required resistance of the feeding end; Z2 represents the equivalent impedance of the matching antenna; and Z0 represents the spatial intrinsic impedance.

[0025] A further optimization scheme is to preset a threshold range of the matching antenna width, and to construct a matching antenna model within the threshold range of the matching antenna width based on electromagnetic simulation software, and to calculate the optimal matching antenna size that makes the matching antenna model meet the matching antenna equivalent impedance; including the method:

[0026] The propagation constant of the matching antenna model is obtained according to the material and thickness of the metal layer of the packaging box and the wavelength of the UHF RFID tag;

[0027] The threshold range of the matching antenna equivalent impedance and the matching antenna width is set, and the matching antenna length and the matching antenna width are used as input variables, and the optimal matching antenna size is calculated based on the trained improved genetic algorithm model; wherein the input variables satisfy the following transmission transformation relationship:

[0028]

[0029] Among them, Z 2in (l0,w0) represents the function of the equivalent impedance of the matching antenna with respect to the input variable; Z L Represents the intermediate impedance; Z a represents characteristic impedance; β represents the propagation constant of the matching antenna model; l0 represents the length of the matching antenna; w0 represents the width of the matching antenna; ln represents the logarithmic function.

[0030] A further optimization scheme is that the training method of the improved genetic algorithm model includes:

[0031] After performing crossover and mutation operations on individuals, the optimal individuals of the population that have degraded are screened out;

[0032] The optimal individuals of each group screened out are trained for secondary optimization. The principle of secondary optimization is:

[0033]

[0034] g=g+H 2 ;

[0035]

[0036] Among them, c j represents the parameters before updating, i.e. the parameters of the jth cycle; c j+1 represents the updated parameters, i.e. the parameters of the j+1th loop; H represents the calculated gradient; g represents the cumulative square gradient, which is initialized to 0; a represents the global learning rate; d() / d() represents the derivative operation; n represents the loop parameters; P i represents the expected value of the i-th sample; O i Represents the true value of the i-th sample;

[0037] If the new individual obtained after the secondary optimization training is better than the optimal individual of the original population, the new individual will replace the optimal individual of the original population, and the fitness value of the optimal individual of the population after the secondary optimization training will be recorded. The maximum fitness value will be used as the global extreme value, and the number threshold will be set. If the number of times that a better global extreme value is not generated exceeds the number threshold, the search direction of the entire population will be changed, and the cumulative square gradient during the secondary optimization training process will be reset.

[0038] A further optimization scheme is to perform slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; including the method:

[0039] The slot size is determined based on the optimal matching antenna size: width w = kw0; length l = l0; where k represents the width coefficient;

[0040] Create gaps in the metal layer on each side of the box according to the following rules:

[0041] On the same packaging box, the width of the gaps opened on different planes is w, and the sum of the lengths of the gaps on all planes is l;

[0042] A first recognition threshold interval, a second recognition threshold interval and a distance threshold interval are preset, wherein the second recognition threshold interval is larger than the first recognition threshold interval; if the target recognition distance is within the first recognition threshold interval, a slit is opened on a plane on the packaging box; if the target recognition distance is within the second recognition threshold interval, multiple parallel slits are opened on a plane on the packaging box, and the distance between two adjacent slits is within the preset distance interval.

[0043] The present solution also provides a packaging structure design system containing an ultra-high frequency RFID tag, which is used to implement the above-mentioned packaging structure design method containing an ultra-high frequency RFID tag, and the system includes:

[0044] Collection module, used to obtain packaging box information and UHF RFID tag information;

[0045] An estimation module is used to estimate the matching antenna equivalent impedance of the gap according to the UHF RFID tag information and the packaging box information;

[0046] The calculation module is used to preset the threshold range of the matching antenna width, and build a matching antenna model within the threshold range of the matching antenna width based on the electromagnetic simulation software, and calculate the optimal matching antenna size that makes the matching antenna model meet the matching antenna equivalent impedance.

[0047] The layout module is used to perform slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening positions and slot sizes.

[0048] The present solution also provides a computer-readable medium having a computer program stored thereon, and the computer program is executed by a processor to implement the above-mentioned method for designing a packaging structure containing an ultra-high frequency RFID tag.

[0049] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0050] 1. The packaging structure, method, system and medium containing an ultra-high frequency RFID tag provided by the present invention; based on the traditional RFID metal packaging technology, improvements are made at the packaging structure level and the design method level; by opening a gap of a specific size on one side or multiple sides of the metal layer of the packaging box, the size of the gap is determined by the wavelength of the ultra-high frequency RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the packaging box size and the position of the ultra-high frequency RFID tag in the packaging box; not only a transmission channel for energy and data is formed, but also by enabling the metal layer with a gap of a specific size to be converted into an antenna, multi-directional stable transmission of RFID data and energy is achieved.

[0051] 2. The packaging structure, method, system and medium containing ultra-high frequency RFID tags provided by the present invention; when performing slot layout, the double-slit interference principle is used to determine the number of slots opened on the metal layer on each side of the packaging box; for scenarios where the target recognition distance is relatively long, multiple slots are opened on the same plane of the packaging box based on the double-slit interference principle to achieve external amplification and enhancement of the electromagnetic radiation signal; for scenarios where the target recognition distance is relatively short, a slot is opened on a plane of the packaging box to ensure normal signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0053] Figure 1 This is a schematic diagram of the electromagnetic radiation principle in the passive UHF RFID system;

[0054] Figure 2 It is a schematic diagram of the equivalent circuit of the RFID tag in the passive UHF RFID system;

[0055] Figure 3 This is a schematic diagram of the electromagnetic radiation principle of traditional passive UHF RFID packaging;

[0056] Figure 4 This is a schematic diagram of the packaging structure containing an ultra-high frequency RFID tag;

[0057] Figure 5 is a schematic diagram of an equivalent circuit containing an ultra-high frequency RFID tag;

[0058] Figure 6 A schematic diagram of a method for designing a packaging structure containing an ultra-high frequency RFID tag;

[0059] Figure 7 This is a schematic diagram of a single-sided single-seam packaging structure;

[0060] Figure 8 It is a schematic diagram of the adjacent multi-seam A packaging structure;

[0061] Fig. 9 It is a schematic diagram of the adjacent multi-seam B packaging structure;

[0062] Fig.10 It is a schematic diagram of the multi-seam packaging structure on the opposite side;

[0063] Fig.11 This is a schematic diagram of the packaging structure of an annular slit A;

[0064] Fig.12 This is a schematic diagram of the packaging structure of an annular slit B;

[0065] Fig.13 This is a schematic diagram of the single-sided multi-seam packaging structure.

[0066] Marks and corresponding parts names in the attached drawings:

[0067] 1-packaging box, 2-UHF RFID tag, 3-gap. DETAILED DESCRIPTION

[0068] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0069] In passive UHF RFID systems, RFID tags obtain energy and transmit data through electromagnetic radiation, such as Figure 1 As shown in the figure, electromagnetic waves, as a type of wave, have reflection, diffraction and other phenomena. When the current passes through the reader antenna, it will generate a radiation magnetic field. After the RFID tag enters the radiation magnetic field range, the RFID tag antenna receives the energy and data of the radiation magnetic field. The energy is used to activate the RFID tag, and the data is used for information exchange. The Thevenin equivalent circuit of the RFID tag is as follows: Figure 2 As shown, the voltage Vs is the voltage generated by the tag sensing reader transferring energy, the inductance La is the inductance of the RFID tag antenna, the resistance Ra is the resistance of the RFID tag antenna, the capacitance Cc is the internal capacitance of the chip, and the resistance Rc is the internal resistance of the chip.

[0070] like Figure 3 As shown, the traditional metal packaging layer will have a serious impact on the RFID tag. First, the radio frequency signal cannot penetrate the metal, and the entire surface of the metal will completely reflect the RFID tag signal, making it impossible for the reader and the RFID tag to communicate.

[0071] When ultra-high frequency RFID technology is applied to metal packaging or packaging containing metal components, there are problems such as the reading direction is limited to the area directly in front of the RFID tag, the metal material will reflect the signal, and it cannot be used inside a closed metal packaging; the tag structure is complex and the production efficiency is low; it needs to be pasted on the surface of the item during use, and because the tag has a two-layer structure, it has a certain thickness, generally 1mm-2mm thick, which limits the use of RFID tags for smaller unit products inside metal packaging. In view of this, this solution provides the following embodiments to solve the above technical problems:

[0072] Example 1

[0073] This embodiment provides a packaging structure containing an ultra-high frequency RFID tag, such as Figure 4 As shown, including:

[0074] A packaging box 1 including a metal layer, used to enclose one or more target commodities;

[0075] An ultra-high frequency RFID tag 2 is used to carry information of a target product; the ultra-high frequency RFID tag is attached to the corresponding target product in the packaging box;

[0076] One or more surfaces of the metal layer are provided with n gaps 3 of a specific size; n≥1.

[0077] The metal layer can be understood as the current layer of the packaging box being completely composed of metal materials (such as Wuxi steel plate), or the entire layer containing metal components (such as metal cardboard, coated steel plate, etc.);

[0078] The gap is rectangular; the size of the gap is determined by the wavelength of the UHF RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the size of the packaging box and the position of the UHF RFID tag in the packaging box.

[0079] This solution designs one or more gaps on the metal layer of the packaging box. These gaps have specific sizes, which are usually related to the wavelength of the UHF RFID tag. The UHF RFID tag is located inside and does not contact the metal packaging. At this time, gaps are opened in the direction where communication is required, so that energy and data in more directions can be received and transmitted.

[0080] like Figure 5 As shown, in this solution, the gap is opened to interact with the UHF RFID tag through inductive coupling, the resistance Rp is the equivalent resistance at the gap, and the inductance Lp is the equivalent inductance at the gap.

[0081] The basic calculation formula for the impedance of each part is as follows:

[0082] The impedance Zp of the slot equivalent antenna is: Zp = Rp + jωLp;

[0083] The impedance Za of the UHF RFID tag antenna is: Za = Ra + jωLa;

[0084] The partial impedance Zc of the UHF RFID tag chip is: Zc=Rc+1 / jωCc;

[0085] The impedance of each type of chip of the UHF RFID tag is a confirmed fixed value. In order to achieve the maximum power transmission, the antenna and chip of the UHF RFID tag need impedance matching to form a complex conjugate. In this solution, the problem of opening a gap and impedance matching of the UHF RFID tag also needs to be considered. Usually, the impedance of electronic circuits will change in a high-frequency working environment. In this solution, it is necessary to first calculate and confirm the general impedance, then perform simulation to further narrow the impedance range, and finally test it through a vector network analyzer.

[0086] Example 2

[0087] This embodiment provides a packaging structure design method containing an ultra-high frequency RFID tag, which is used to obtain the packaging structure containing an ultra-high frequency RFID tag described in Embodiment 1, such as Figure 6 As shown, the method includes:

[0088] Step 1: Obtain packaging box information and UHF RFID tag information;

[0089] Step 2: Estimate the matching antenna equivalent impedance of the gap based on the UHF RFID tag information and the packaging box information; this step specifically includes the following methods:

[0090] S21, obtaining the required resistance of the feed end according to the working wavelength of the UHF RFID tag;

[0091] S22, substituting the required resistance of the feed end into the following formula to calculate the equivalent impedance of the matching antenna:

[0092]

[0093] Among them, Z1 represents the required resistance of the feed end; Z2 represents the equivalent impedance of the matching antenna; Z0 represents the spatial intrinsic impedance, which is usually 376.7Ω.

[0094] This solution makes the gap part of the tag antenna. The reader and the UHF RFID tag interact with each other through electromagnetic radiation, and the gap interacts with the UHF RFID tag through inductive coupling. Each interaction link has a certain amount of energy loss. For the sake of wider universality, the reader and writer end is not modified. This solution reduces unnecessary energy loss by designing the UHF RFID antenna and calculating the size of the gap in the metal layer to achieve the best matching effect among the three.

[0095] Step 3: Preset a matching antenna width threshold range, and build a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and calculate the optimal matching antenna size that makes the matching antenna model meet the matching antenna equivalent impedance; this step specifically includes the following methods:

[0096] S31, obtaining a propagation constant matching the antenna model according to the material and thickness of the metal layer of the packaging box and the wavelength of the UHF RFID tag;

[0097] S32, setting the threshold range of the matching antenna equivalent impedance and the matching antenna width, and using the matching antenna length and the matching antenna width as input variables, and calculating the optimal matching antenna size based on the trained improved genetic algorithm model; wherein the input variables satisfy the following transmission transformation relationship:

[0098]

[0099] Among them, Z 2in (l0,w0) represents the function of the equivalent impedance of the matching antenna with respect to the input variable; Z L Represents the intermediate impedance; Z arepresents characteristic impedance; β represents the propagation constant of the matching antenna model; l0 represents the length of the matching antenna; w0 represents the width of the matching antenna; ln represents the logarithmic function.

[0100] The training method of the improved genetic algorithm model includes:

[0101] S321, after performing crossover mutation operations on individuals, the optimal individuals of the population that have degraded are screened out;

[0102] S322, perform secondary optimization training on the selected optimal individuals of various groups. The principle of secondary optimization is:

[0103]

[0104] g=g+H 2 ;

[0105]

[0106] Among them, c j represents the parameters before updating, i.e. the parameters of the jth cycle; c j+1 represents the updated parameters, i.e. the parameters of the j+1th loop; H represents the calculated gradient; g represents the cumulative square gradient, which is initialized to 0; a represents the global learning rate; d() / d() represents the derivative operation; n represents the loop parameters; P i represents the expected value of the i-th sample; O i Represents the true value of the i-th sample;

[0107] S323, if the new individual obtained after the secondary optimization training is better than the optimal individual of the original population, the optimal individual of the original population is replaced by the new individual, and the fitness value of the optimal individual of the population obtained after the secondary optimization training is recorded. The maximum fitness value is used as the global extreme value, and a number threshold is set. If the number of times that a better global extreme value is not generated exceeds the number threshold, the search direction of the entire population is changed, and the cumulative square gradient during the secondary optimization training process is reset.

[0108] Step 4: Perform slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening position and slot size. This step specifically includes the following methods:

[0109] The slot size is determined according to the optimal matching antenna size: width w = kw0; length l = l0; where k represents the width coefficient; the optimal matching antenna sizes obtained in this scheme are w0 and l0; the dipole antenna is composed of a pair of symmetrically placed conductors, which radiate and receive waves and can be used as a transmitting antenna or a receiving antenna; therefore, this scheme uses the dipole antenna model as the matching antenna model, and the rectangular slot is a flat strip, then the width W of the slot is equivalent to twice the diameter w0 of the dipole antenna cylindrical conductor, that is, k = 2.

[0110] Create gaps in the metal layer on each side of the box according to the following rules:

[0111] On the same packaging box, the width of the gaps opened on different planes is w, and the sum of the lengths of the gaps on all planes is l;

[0112] Preset a first recognition threshold interval, a second recognition threshold interval and a distance threshold interval, wherein the second recognition threshold interval is greater than the first recognition threshold interval;

[0113] If the target recognition distance is within the first recognition threshold interval, a gap is opened on a plane of the packaging box;

[0114] If the target recognition distance is within the second recognition threshold interval, a plurality of parallel slits are provided on a plane of the packaging box, and the distance between two adjacent slits is within the preset distance interval.

[0115] Under the premise of knowing the size of the slit, according to the actual needs of the packaging box, multiple slits or a single slit can be opened, or it can be opened on one side or multiple sides of the packaging box. Various slit opening methods are as follows: Figure 7-Figure 12 As shown; when the calculated gap length is short and can meet the single-side size of the packaging box, Figure 7 As shown, a single slit can be opened on a single side of the packaging box according to the needs; when the calculated slit length is too long to meet the single side size of the packaging box, Figure 8 and Fig. 9 As shown, according to the needs, the gaps can be opened on the packaging box in the form of multiple adjacent seams A or multiple adjacent seams B; when multiple target products are packed in the packaging box and the target products are arranged in multiple rows, the gaps can be opened in the form of multiple adjacent seams A or multiple adjacent seams B. Fig.10 The gaps are opened in the opposite multi-slit manner shown so that the target products in each column can be identified; or Fig.11 and Fig.12 The gap is opened in the manner of the annular slit A or the annular slit B shown.

[0116] Example 3

[0117] This embodiment provides a packaging structure design system containing an ultra-high frequency RFID tag, which is used to implement the packaging structure design method containing an ultra-high frequency RFID tag described in Example 2. The system includes:

[0118] Collection module, used to obtain packaging box information and UHF RFID tag information;

[0119] An estimation module is used to estimate the matching antenna equivalent impedance of the gap according to the UHF RFID tag information and the packaging box information;

[0120] A calculation module is used to preset a matching antenna width threshold range, and to construct a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and to calculate an optimal matching antenna size that enables the matching antenna model to satisfy the matching antenna equivalent impedance;

[0121] The layout module is used to perform slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening positions and slot sizes.

[0122] Example 4

[0123] This embodiment provides a computer-readable medium on which a computer program is stored. The computer program is executed by a processor to implement the method for designing a packaging structure containing an ultra-high frequency RFID tag as described in Embodiment 2. Specifically, the following steps are performed:

[0124] Step 1: Obtain packaging box information and UHF RFID tag information;

[0125] Step 2: Estimate the gap equivalent impedance parameters based on the UHF RFID tag information and the packaging box information;

[0126] Step 3: Preset a matching antenna width threshold range, and build a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and calculate the optimal matching antenna size that makes the matching antenna model meet the matching antenna equivalent impedance;

[0127] Step 4: Performing slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening position and slot size;

[0128] like Fig.13 The metal packaging structure shown is an example of a health product. The UHF RFID tag is attached to the inside of the health product packaging box, which is made of gold card paper. At this time, an attempt is made to read the tag from outside the box using an UHF PDA or UHF reader. Due to the reflection of the radio frequency signal by the gold card paper, the RFID tag cannot receive the signal from the PDA or reader at all, and cannot be read. RFID data collection is not possible without changing the packaging material.

[0129] There are 6 small packages in the gold card paper package, all of which have UHF RFID tags, which require a long identification distance. In order to read all 6 UHF RFID tags outside the packaging box containing the gold card paper layer, the above method uses the double-slit interference principle to determine the number of slits opened on the metal layer on each side of the packaging box when performing the gap layout. For scenes with a long target identification distance, multiple slits are opened on the same plane of the packaging box based on the double-slit interference principle to achieve external amplification and enhancement of electromagnetic radiation signals; it is necessary to open 2 slits in the gold card paper package; use the UHF PDA or UHF reader to read the tag from the outside of the box again. Due to the antennaization of the gap, the tag in the packaging box can be stably read in multiple directions at this time. The production management, traceability, logistics management, and inventory of the product are realized.

[0130] This embodiment also provides an example of calculating the slit of high-end cosmetic packaging: the size of the high-end cosmetic packaging box is: 0cm×20cm×10cm, and the ultra-high frequency RFID tag uses a tag with a center frequency f of 920MHz, and its wavelength B is calculated according to the formula B=c / f, where c is the speed of light. At a frequency of 920Mhz, the calculated wavelength B is 32.6cm, and the feed resistance is designed to be 530+j0Ω according to empirical requirements, and the equivalent impedance of its matching antenna is calculated to be 67+j0Ω; according to the actual packaging appearance requirements, the slit is expected to be 0.3cm, and the slit width W is designed to be 0.326cm; after simulation calculation, when resonance occurs when L=0.475λ is about 15.485cm, its feed impedance is 67+j0Ω; the slit size is finally determined to be 15.485cm*0.326cm, and the final rounded size is: 15.5cm*0.3cm.

[0131] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A packaging structure containing an ultra-high frequency RFID tag, characterized in that: include: A packaging box containing a metal layer, used to enclose one or more target products; UHF RFID tags are used to carry information about target products; The UHF RFID tag is attached to the corresponding target product in the packaging box; One or more surfaces of the metal layer are provided with n gaps of specific size; n≥1.

2. The packaging structure containing an ultra-high frequency RFID tag according to claim 1, characterized in that: The gap is rectangular; the size of the gap is determined by the wavelength of the UHF RFID tag; the opening position of the gap is determined by the target recognition distance, the gap size, the packaging box size and the position of the UHF RFID tag in the packaging box.

3. The packaging structure containing an ultra-high frequency RFID tag according to claim 1, characterized in that: When it is determined to open a gap on a single-sided metal layer of the packaging box, the gap opening surface is the surface of the packaging box that is parallel to the plane where the RFID tag is located and is closest to the plane where the RFID tag is located.

4. A method for designing a packaging structure containing an ultra-high frequency RFID tag, characterized in that: The method for obtaining the packaging structure containing the UHF RFID tag according to any one of claims 1 to 3 comprises: Get the packaging box information and UHF RFID tag information; Estimate the matching antenna equivalent impedance of the gap based on the UHF RFID tag information and the packaging box information; Preset a matching antenna width threshold range, and build a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and calculate the optimal matching antenna size that enables the matching antenna model to meet the matching antenna equivalent impedance; The slots are laid out on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening positions and slot sizes.

5. The method for designing a packaging structure containing an ultra-high frequency RFID tag according to claim 4, characterized in that: The matching antenna equivalent impedance of the gap is estimated according to the UHF RFID tag information and the packaging box information; Included methods: The required resistance of the feed end is obtained according to the working wavelength of the UHF RFID tag; Substitute the required resistance of the feed end into the following formula to calculate the equivalent impedance of the matching antenna: Among them, Z1 represents the required resistance of the feeding end; Z2 represents the equivalent impedance of the matching antenna; and Z0 represents the spatial intrinsic impedance.

6. The method for designing a packaging structure containing an ultra-high frequency RFID tag according to claim 4, characterized in that: The preset matching antenna width threshold range, and constructing a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and calculating the optimal matching antenna size that makes the matching antenna model meet the matching antenna equivalent impedance; Included methods: The propagation constant of the matching antenna model is obtained according to the material and thickness of the metal layer of the packaging box and the wavelength of the UHF RFID tag; The threshold ranges of the matching antenna equivalent impedance and the matching antenna width are set, and the matching antenna length and the matching antenna width are used as input variables, and the optimal matching antenna size is calculated based on the trained improved genetic algorithm model; wherein the input variables satisfy the following transmission transformation relationship: Among them, Z 2in (l0,w0) represents the function of the equivalent impedance of the matching antenna with respect to the input variable; Z L Indicates the intermediate impedance; Z a represents characteristic impedance; β represents the propagation constant of the matching antenna model; l0 represents the length of the matching antenna; w0 represents the width of the matching antenna; ln represents the logarithmic function.

7. The method for designing a packaging structure containing an ultra-high frequency RFID tag according to claim 6, characterized in that: The training method of the improved genetic algorithm model includes: After performing crossover and mutation operations on individuals, the optimal individuals of the population that have degraded are screened out; The optimal individuals of each group screened out are trained for secondary optimization. The principle of secondary optimization is: g=g+H 2 ; Among them, c j represents the parameters before updating, i.e. the parameters of the jth cycle; c j+1 represents the updated parameters, i.e. the parameters of the j+1th loop; H represents the calculated gradient; g represents the cumulative square gradient, which is initialized to 0; a represents the global learning rate; d() / d() represents the derivative operation; n represents the loop parameters; P i represents the expected value of the i-th sample; O i Represents the true value of the i-th sample; If the new individual obtained after the secondary optimization training is better than the optimal individual of the original population, the new individual will replace the optimal individual of the original population, and the fitness value of the optimal individual of the population after the secondary optimization training will be recorded. The maximum fitness value will be used as the global extreme value, and the number threshold will be set. If the number of times that a better global extreme value is not generated exceeds the number threshold, the search direction of the entire population will be changed, and the cumulative square gradient during the secondary optimization training process will be reset.

8. The method for designing a packaging structure containing an ultra-high frequency RFID tag according to claim 7, characterized in that: The slot layout is performed on the packaging box with the optimal matching antenna size to obtain the slot parameters; Included methods: The slot size is determined based on the optimal matching antenna size: width w = kw0; length l = l0; where k represents the width coefficient; Create gaps in the metal layer on each side of the box according to the following rules: On the same packaging box, the width of the gaps opened on different planes is w, and the sum of the lengths of the gaps on all planes is l; A first recognition threshold interval, a second recognition threshold interval and a distance threshold interval are preset, wherein the second recognition threshold interval is larger than the first recognition threshold interval; if the target recognition distance is within the first recognition threshold interval, a slit is opened on a plane on the packaging box; if the target recognition distance is within the second recognition threshold interval, multiple parallel slits are opened on a plane on the packaging box, and the distance between two adjacent slits is within the preset distance interval.

9. A packaging structure design system containing an ultra-high frequency RFID tag, characterized in that: A method for designing a packaging structure containing an ultra-high frequency RFID tag according to any one of claims 5 to 8, wherein the system comprises: Collection module, used to obtain packaging box information and UHF RFID tag information; An estimation module is used to estimate the matching antenna equivalent impedance of the gap according to the UHF RFID tag information and the packaging box information; A calculation module is used to preset a matching antenna width threshold range, and to construct a matching antenna model within the matching antenna width threshold range based on electromagnetic simulation software, and to calculate an optimal matching antenna size that enables the matching antenna model to satisfy the matching antenna equivalent impedance; The layout module is used to perform slot layout on the packaging box with the optimal matching antenna size to obtain slot parameters; the slot parameters include slot opening positions and slot sizes.

10. A computer readable medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement the method for designing a packaging structure containing an ultra-high frequency RFID tag as described in any one of claims 5 to 8.

Images