Broadband non-folding anti-metal ultrahigh frequency radio frequency identification tag

Abstract

According to certain embodiments, a broadband, non-folding, anti-metal UHF RFID tag is disclosed. The broadband, non-folding, anti-metal UHF RFID tag (100) may include a substrate and an antenna. The antenna may include a first dipole antenna having a first cutout slot, a second dipole antenna having a second cutout slot, and a first loop antenna and a second loop antenna disposed within an antenna center region. The broadband non-folding anti-metal UHF RFID tag (100) may include an RFID chip embedded in the center of a central area of an antenna, and a dielectric substrate adhered to the lower surfaces of the antenna and the RFID chip.

Description

Technical Field

[0001] The present invention generally relates to RFID inlays or tags. Specifically, the present invention relates to broadband non-folded metal-resistant UHF RFID tags. Background Art

[0002] Radio Frequency Identification (“RFID”) uses electromagnetic energy (“EM energy”) to stimulate or interrogate a responder device, called an RFID “tag”, inlay or transponder, to identify itself and, in some cases, provide additional stored data. RFID tags typically include semiconductor devices, namely integrated circuits (ICs), commonly referred to as ICs or “chips”. The chip contains the memory and operating circuitry for the tag and is connected or otherwise coupled to an antenna.

[0003] Generally, in response to a radio frequency (“RF”) interrogation signal received from a reader (also called an interrogator), an RFID tag provides information stored in the chip memory. For passive RFID tags such as ultra-high frequency (“UHF”) RFID tags (i.e., RFID tags without an internal power source), the energy of the interrogation signal provides the necessary energy for the RFID tag to operate by creating a potential difference across the chip. However, since a metal surface is a conductive surface that can block, reflect, or otherwise adversely interfere with the propagation operation of an RFID tag, if an RFID tag is mounted on a metal surface, the amount of energy received by the antenna may be significantly reduced. In addition, the proximity of the metal surface to the RFID tag provides additional reactance to the RFID tag's circuitry. For example, an antenna resonance frequency shift can reduce or disrupt the impedance match between the antenna and the chip, rendering the tag unreadable within the desired read range or inoperable for other reasons.

[0004] The above problems pose significant challenges to users who want to tag metal objects. For example, many components in packaging, container shipping, and objects are at least partially made of metal, so the ability to tag components using RFID technology is adversely affected. In addition, many companies use metal packaging as a unique branding tool. Therefore, there is a need for RFID tags that can adhere or stick to metal surfaces without significantly or partially attenuating incoming signals. However, traditional UHF RFID tags that use such metal objects and packaging in a differential attachment, indirect attachment, or away from metal or conductive surfaces can avoid short circuits and / or functional defects in the attached UHF RFID tags.

[0005] Subsequently, an "anti-metal" label is introduced. Known anti-metal labels use dipole antennas, and a dielectric substrate is provided between the metal surface and the dipole antenna. In this way, when exposed to RF signals, the possibility of generating a potential difference in the antenna is reduced. Traditionally, anti-metal labels are over-designed and involve additional manufacturing process steps and materials, increasing costs.

[0006] In addition, known UHF RFID anti-metal labels can operate at a single read frequency received from an RFID reader. In fact, in different geographical locations, the operating frequencies of UHF RFID readers vary according to national or regulatory standards. For example, in different geographical locations such as Europe (approximately 860 - 875 MHz as defined by ETSI) or the United States (approximately 890 - 930 MHz as defined by the FCC), the acceptable UHF operating ranges vary significantly. Therefore, traditional UHF RFID anti-metal labels need to be specially configured or designed, and their operating resonance frequencies are only applicable to one geographical location and cannot be used or perform poorly in other geographical locations. In addition, since the design and configuration of the antenna can only resonate at a single resonance frequency, there are differences in impedance matching when operating at the resonance frequency, so traditional UHF RFID anti-metal labels also have limitations related to transmission loss. With the increasing globalization of the nature of the supply chain, there is a need for such UHF labels that can operate in different geographical locations.

[0007] Therefore, in view of the above discussion, it is necessary to overcome the limitations and disadvantages of traditional UHF RFID labels in order to label metal surfaces and enable the antennas of UHF RFID anti-metal labels to operate at different resonance frequencies. Summary of the Invention

[0008] This article describes a broadband non-folded anti-metal UHF RFID label for labeling metal or other conductive surfaces, as well as its manufacturing and operating methods. In certain embodiments, the broadband non-folded anti-metal label can operate at multiple resonance frequencies.

[0009] In certain embodiments, the label includes or comprises a dielectric substrate, which is located between the label and the metal or conductive surface to generate a potential difference and avoid short circuits when exposed to incoming radio frequency signals. In certain embodiments, the label includes dipole and loop antennas that can operate synchronously at multiple resonance frequencies to generate resonance. In certain embodiments, as described above, the label is a ultra-high frequency (UHF) label.

[0010] In certain embodiments, the tag is as described above and further includes or comprises an antenna that can be used for impedance matching. In certain embodiments, the antenna includes or comprises a first dipole antenna having a first notch and a second dipole antenna having a second notch. In certain embodiments, the first and second notches are grooves.

[0011] In certain embodiments, the tag is as described above and further includes a first loop antenna and a second loop antenna disposed within the central region of the antenna.

[0012] In certain embodiments, the tag includes or comprises a chip embedded in the center of the central region of the antenna. In certain embodiments, the RFID chip defines the shape and size of the antenna based on the impedance matching requirements at multiple resonant frequencies when exposed to an RF signal incoming from an RFID reader. In certain embodiments, the chip is electronically coupled, magnetically coupled, or capacitively coupled to the antenna.

[0013] In certain embodiments, the tag is as described above, the first loop antenna is coupled to the first dipole antenna through a first coupling region, and the second loop antenna is coupled to the second dipole antenna through a second coupling region. In certain embodiments, the first loop antenna includes a first elongated slot, and the second loop antenna includes a second elongated slot. The antenna can operate at a resonant frequency within the ultra-high frequency range. Additionally, the antenna can operate at a resonant frequency of 860 MHz or 910 MHz. In certain embodiments, the antenna is adjusted to match the impedance of the incoming signal and the inductive reactance of the antenna, and when the chip is exposed to an RF signal incoming from an RFID reader, the chip can match the impedance at multiple frequencies. The impedance matching is configured to the antenna by adjusting the lengths of the first notch slot and the second notch slot, the depths of the first notch slot and the second notch slot, the lengths of the first loop antenna and the second loop antenna, or the load reactance of the RFID chip.

[0014] In certain embodiments, a method of using the tag described herein is also provided. In certain embodiments, the method includes passing a received incoming signal through the antenna to an RFID chip on the tag. In certain embodiments, the method further includes responding to the received incoming signal to trigger the RFID chip to resonate at at least one of two resonant frequencies that are matched one by one. In certain embodiments, the method also includes transmitting an output signal from the RFID chip back to the antenna and radiating the output signal through the antenna. In certain embodiments, the first dipole antenna and the second dipole antenna are adjusted to resonate at a first resonant frequency, and the first loop antenna, the second loop antenna, and the RFID chip are adjusted to resonate at a second resonant frequency.

[0015] In some embodiments, a method for manufacturing a broadband non-foldable anti-metal tag is also provided. The method includes providing a single metal sheet, such as an aluminum sheet or aluminum foil. The metal sheet is cut to form an antenna. The method also includes constructing a first dipole antenna having a first cut slot and a second dipole antenna having a second cut slot from the antenna. In some embodiments, the method further includes forming a first loop antenna and a second loop antenna within the central region of the antenna.

[0016] These and other features, aspects, embodiments, and advantages of the present invention will be better understood by referring to the following specification and the appended claims. The Summary of the Invention is intended to introduce some concepts in a simplified form. The Summary of the Invention is not intended to identify the key features or essential features of the claimed or disclosed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above Summary of the Invention and the following Detailed Description can be better understood when read in conjunction with the accompanying drawings. To illustrate the present invention, exemplary configurations of the present invention are shown in the drawings. However, the present invention is not limited to the specific methods and tools disclosed herein. In addition, those skilled in the art will understand that the drawings are not drawn to scale. Wherever possible, the same elements are denoted by the same reference numerals.

[0018] Embodiments of the present invention will now be described by way of example only, with reference to the following figures, in which:

[0019] Figure 1A A perspective view of a broadband non-foldable anti-metal UHF RFID tag according to an embodiment is shown;

[0020] Figure 1B A top view of a broadband non-foldable anti-metal UHF RFID tag according to an embodiment is shown;

[0021] Figure 2 is a graph of the resonance frequencies and read ranges of a broadband non-foldable anti-metal UHF RFID tag and a traditional tag according to an embodiment;

[0022] Figure 3 A graph of the resonance frequencies of a broadband non-foldable anti-metal UHF RFID tag when the width of the coupling region changes according to an embodiment is shown;

[0023] Figure 4A A broadband non-foldable anti-metal tag when the length of the loop antenna changes according to the inductive reactance load of the attached RFID chip according to an embodiment is shown;

[0024] Figure 4BShows the resonance frequency chart of a broadband non - folded anti - metal UHF RFID tag according to an embodiment when the length of the loop antenna changes according to the inductive reactance load of the attached RFID chip;

[0025] Figure 5A Shows a broadband non - folded anti - metal UHF RFID tag according to an embodiment, the tag including a notch groove having a notch width;

[0026] Figure 5B Shows a graphical representation of the resonance frequency chart of a broadband non - folded anti - metal UHF RFID tag according to an embodiment when the notch width of the notch groove changes;

[0027] Figure 5C Shows a broadband non - folded anti - metal UHF RFID tag according to an embodiment, the tag including a notch groove having a notch depth;

[0028] Figure 5D Shows the resonance frequency chart of a broadband non - folded anti - metal UHF RFID tag according to an embodiment when the notch depth of the notch groove changes;

[0029] Figure 6 Is a flowchart of an operation method of a broadband non - folded anti - metal UHF RFID tag according to an exemplary embodiment of the present invention;

[0030] Figure 7 Is a flowchart of a manufacturing method of a broadband non - folded anti - metal tag according to an embodiment.

[0031] In the drawings, underlined numbers represent the items at the positions where the underlined numbers are located, or the items adjacent to the underlined numbers. Non - underlined numbers relate to the items identified by the connections of the non - underlined numbers and items. When a number is non - underlined and has a related arrow, this non - underlined number is used to identify the general item pointed to by the arrow. Detailed Description of the Invention

[0032] The following detailed description illustrates various embodiments of the present invention and their implementation manners. Although certain ways of implementing the present invention have been disclosed, those skilled in the art will recognize that there may be other embodiments for implementing or practicing the present invention. Some of the embodiments disclosed herein include one or more of methods, devices, and / or systems for adding UHF RFID tags to metal or conductive surfaces.

[0033] Some embodiments provide a broadband non - folded anti - metal UHF RFID tag. The broadband non - folded anti - metal UHF RFID tag includes:

[0034] An antenna, including a first dipole antenna having a first cut slot, a second dipole antenna having a second cut slot, and a first loop antenna and a second loop antenna disposed within the central region of the antenna; and

[0035] An RFID chip, embedded in the center of the central region of the antenna.

[0036] Some embodiments provide a method of operating a broadband non-foldable metal-resistant tag. The method includes:

[0037] Receiving an incoming signal at a predefined frequency through the antenna of the UHF RFID tag;

[0038] Transmitting the received incoming signal through the antenna to the RFID chip of the UHF RFID tag;

[0039] In response to the received incoming signal, triggering the RFID chip to resonate at at least two frequencies that are matched one by one;

[0040] Transmitting the output signal from the RFID chip back to the antenna; and

[0041] Radiating the output signal through the antenna.

[0042] On the other hand, some embodiments of the present invention provide a method of manufacturing a broadband non-foldable metal-resistant tag. The method includes:

[0043] Cutting a metal sheet to form an antenna;

[0044] Forming a first dipole antenna having a first cut slot and a second dipole antenna having a second cut slot from the antenna; and

[0045] Forming a first loop antenna and a second loop antenna disposed within the central region of the antenna.

[0046] The term "metal-resistant tag" throughout the present invention refers to a wireless identification tag, such as a UHF RFID tag, a smart tag, and other ultra-high frequency tags. In various embodiments, the wireless identification tag can enable or otherwise support efficient, economical, and time-saving item-level identification for locating, identifying, and tracking desired items. Additionally, in certain embodiments used herein, the wireless identification tag can also determine the location of an item, information regarding the availability or presence of an item, and response signals of a selected or desired item. In particular, various embodiments relate to UHF RFID tags placed on metal for tracking metal objects or objects having a metal or conductive surface. In particular, when the RFID reader is activated, a UHF RF signal is transmitted from the RFID reader. In this case, when the UHF RFID tag is affected by the UHF RF signal, the antenna of the UHF RFID tag receives the UHF RF signal and transmits it back to the reader while storing the information in the RFID tag chip.

[0047] Figure 1A A perspective view of a broadband non-foldable metal-resistant UHF RFID tag 100 according to an embodiment is shown. Figure 1B A top view of a broadband non-foldable metal-resistant UHF RFID tag 100 according to an embodiment is shown.

[0048] In certain embodiments, the broadband non-foldable metal-resistant UHF RFID tag 100 may include an item-level identification system, an item-level positioning system, or an item-level indication system. The item-level identification system used herein includes item-level identification, item-level positioning, and item-level indication in one or more embodiments within the scope of the present invention.

[0049] In various embodiments, the broadband non-foldable metal-resistant UHF RFID tag 100 includes a substrate 102. The substrate 102 used herein is a non-metallic layer made of a polymeric material, paper, or a similar material. The substrate 102 is provided to support the broadband non-foldable metal-resistant UHF RFID tag 100 and components attached and / or mounted therein.

[0050] In certain embodiments, the broadband non-foldable metal-resistant RFID tag 100 includes an antenna 104. The antenna 104 used herein refers to an RFID antenna for transmitting and receiving radio frequency signals to / from the RFID tag. According to an embodiment, the antenna 104 is a UHF RFID antenna that can operate at a resonant frequency within the UHF range. Additionally, depending on the UHF range variation, such as 860 - 875 MHz defined by ETSI (Europe) and 890 - 930 MHz defined by FCC (USA), the antenna can operate at an acceptable operating resonant frequency.

[0051] According to an embodiment, the antenna 104 includes a first dipole antenna 106 having a first notch slot 108 and a second dipole antenna 110 having a second notch slot 112. The dipole antenna used herein is a receiver and radiator operating at UHF. In an embodiment, the first dipole antenna 106 and the second dipole antenna 110 are substantially the same as each other. In some embodiments, the first dipole antenna 106 and the second dipole antenna 110 are serpentine antennas made of a metal sheet (such as an aluminum sheet), foil, or other conductive material (such as conductive ink). In an embodiment where the antenna 104 is formed of a metal sheet or foil, the first notch slot 108 and the second notch slot 112 can be made by removing material from the first dipole antenna 106 and the second dipole antenna 110, for example, by using an etching or die-cutting process. In an alternative embodiment, the antenna 104 can be formed by printing conductive ink onto a substrate 102, in which case the first dipole antenna 106, the first notch slot 108, the second dipole antenna 110, and the second notch slot 112 are all formed by a printing process. Additionally, in an embodiment, the first notch slot 108 and the second notch slot 112 are substantially rectangular. When responding to an incoming frequency, the provision of the first notch slot 108 and the second notch slot 112 helps the antenna 104 achieve impedance matching.

[0052] In an embodiment, the antenna 104 further includes a first loop antenna 114 and a second loop antenna 116 disposed within a central region 118 of the antenna 104. The first loop antenna 114 and the second loop antenna 116 form a closed loop antenna of the antenna 104. The central region 118 used herein refers to the central portion of the antenna 104, which horizontally extends from the center of the left portion of the antenna 104 to the center of the right portion of the antenna 104 and vertically extends from the center of the upper portion of the antenna 104 to the center of the lower portion of the antenna 104. Additionally, in an embodiment, the first loop antenna 114 and the second loop antenna 116 each form a curved rectangular shape. In some embodiments, the first loop antenna 114 includes a first elongated slot, and the second loop antenna 116 includes a second elongated slot. In response to an incoming frequency, the first loop antenna 114 and the second loop antenna 116 also contribute to impedance matching of the antenna 104. In some embodiments, the antenna 104 including the first loop antenna 114, the second loop antenna 116, the first dipole antenna 106, and the second dipole antenna 110 is made of a single piece of conductive material (i.e., different from being composed of multiple pieces of conductive material that are electrically connected to each other, which may be the case in other embodiments). According to an embodiment, the first loop antenna 114 is coupled to the first dipole antenna 106 through a first coupling region 126, and the second loop antenna 116 is coupled to the second dipole antenna 110 through a second coupling region 128. The coupling region used herein refers to the conductive region formed at the junction of the first loop antenna 114 and the first dipole antenna 106 and at the junction of the second loop antenna 116 and the second dipole antenna 110.

[0053] Since the broadband non-folded anti-metal UHF RFID tag 100 is an inductive circuit, the resonant frequency is achieved in the following manner

[0054] where f0 is the resonant frequency, L is the inductive reactance, and C is the capacitive reactance.

[0055] Therefore, impedance matching is accomplished by changing the inductive reactance and the capacitive reactance. Additionally, the antenna 104 is adjusted to match the frequency of the incoming signal and the inductive reactance of the antenna 104 to radiate back an output signal. Further, impedance matching can be configured for the antenna 104 by adjusting the lengths of the first cut slot 108 and the second cut slot 112 and / or by adjusting the lengths of the first loop antenna 114 and the second loop antenna 116. In various embodiments, impedance matching can also be achieved by changing the lengths of the first coupling region 126 and the second coupling region 128.

[0056] In some embodiments, the broadband non - foldable metal - resistant UHF RFID tag 100 includes an RFID chip 120 substantially embedded in the center 122 of the central region 118 of the antenna 104. The RFID chip 120 used herein is a microchip and integrated circuit that can transmit data under the influence of radio - frequency signals. In some embodiments, the UHF RFID tag 100 is a passive RFID tag that can be activated at a resonant frequency and obtain energy from the incoming signal. In various embodiments, the RFID chip 120 may include different resistances due to different configurations. In the case of the resonant frequency, the cumulative inductive reactance of the antenna 104 and the RFID chip 120 participates in the impedance matching of the incoming RF signal. In this case, the incoming RF signal triggers the RFID chip 120 to transmit data.

[0057] In some embodiments, the first dipole antenna and the second dipole antenna are adjusted to resonate at a first resonant frequency. According to an embodiment, the first dipole antenna and the second dipole antenna are adjusted to produce dipole resonance at a resonant frequency within the UHF frequency range (such as 910 MHz - 960 MHz). In some embodiments, the first loop antenna, the second loop antenna, and the RFID chip are adjusted to resonate at a second resonant frequency. In an embodiment, the first loop antenna, the second loop antenna, and the RFID chip are adjusted to produce loop resonance at a resonant frequency within the UHF frequency range (such as 820 MHz - 870 MHz).

[0058] According to an embodiment, the broadband non - foldable metal - resistant UHF RFID tag 100 includes a dielectric substrate 124 adhered to the lower surfaces of the antenna 104 and the RFID chip 120. In an example, the dielectric substrate 124 is adhered to the lower surfaces of the antenna 104 and the RFID chip 120. In addition, the dielectric substrate is also attached to the substrate 102. The broadband non - foldable metal - resistant UHF RFID tag 100 is adhered to a metal - surface adhesive and fixed on the metal surface of the target item. When the broadband non - foldable metal - resistant UHF RFID tag 100 is exposed to the incoming RF signal, the dielectric substrate 124 generates a potential difference therein to avoid a short - circuit between the broadband non - foldable metal - resistant UHF RFID tag 100 and the metal surface. In some embodiments, the dielectric substrate is a foam with a thickness of 1.3 mm.

[0059] Figure 2It is a comparison chart 200 of the resonant frequencies and reading ranges of the broadband non - foldable metal - resistant UHF RFID tag 100 and a traditional tag according to the embodiments. As shown in the figure, line segment 202 represents the resonant frequencies of the traditional tag at 910 MHz and 1.2 GHz (away from the coverage range), while line segment 204 represents the resonant frequencies of the broadband non - foldable metal - resistant UHF RFID tag 100 at 860 MHz and 930 MHz (both within the coverage range). In addition, line segment 206 depicts the reading range of the traditional tag, which is approximately 4.5 m. On the other hand, line segment 208 depicts the reading range of the broadband non - foldable metal - resistant UHF RFID tag 100, which is approximately 9 m.

[0060] Figure 3 It shows a graphical representation of a resonant frequency chart 300 of the broadband non - foldable metal - resistant UHF RFID tag 100 according to the embodiments when the width of the coupling region changes. Thus, chart 300 illustrates the influence of the coupling region on the impedance matching and resonant frequency of the broadband non - foldable metal - resistant UHF RFID tag 100.

[0061] Figure 4A It shows the broadband non - foldable metal - resistant UHF RFID tags 402 and 404 according to the embodiments when the length of the loop antenna changes according to the inductive reactance loads of RFID chips 406 and 408. As shown herein, the broadband non - foldable metal - resistant UHF RFID tags 402 and 404 include RFID chips 406 and 408 with capacitive loads of 0.85 pF and 1.5 pF respectively. Therefore, the broadband non - foldable metal - resistant UHF RFID tag 402 includes a loop antenna with a longer length, and the broadband non - foldable metal - resistant UHF RFID tag 404 includes a loop antenna with a shorter length. Figure 4B It shows a resonant frequency chart 410 of the broadband non - foldable metal - resistant UHF RFID tags 402 and 404 according to the embodiments of the present invention when the length of the loop antenna changes according to the inductive reactance of the RFID chip loads of RFID chips 406 and 408. Chart 410 depicts the resonant frequency of the broadband non - foldable metal - resistant UHF RFID tag 402 on line segment 412 and the resonant frequency of the broadband non - foldable metal - resistant UHF RFID tag 404 on line segment 414.

[0062] Figure 5A It shows a broadband non - foldable metal - resistant UHF RFID tag according to the embodiments, the tag including a notch slot 502 with a notch width 504. In addition, the broadband non - foldable metal - resistant UHF RFID tag 500 can be configured with a resonant frequency that is substantially determined by the notch width 504 of the broadband non - foldable metal - resistant UHF RFID tag 500. Figure 5BShows the resonance frequency chart 506 of the broadband non-folded anti-metal UHF RFID tag 500 according to an embodiment based on different notch widths 504 of the notch slot 502. As Figure 5B shown, the line segment 508 depicts the resonance frequency at which the broadband non-folded anti-metal UHF RFID tag 500 with a notch width 504 of 19 mm operates in the UHF range when exposed to an RF signal. Similarly, the chart 506 also depicts a line segment 510 with a notch width 504 of 21 mm, a line segment 510 corresponding to a notch width 504 of 21 mm, a line segment 512 corresponding to a notch width 504 of 23 mm, a line segment 514 corresponding to a notch width 504 of 25 mm, and a line segment 516 corresponding to a notch width 504 of 27 mm. As Figure 5B shown, the chart 506 shows that the read range varies according to the change in the notch width 504 of the notch slot 502.

[0063] Figure 5C Shows the broadband non-folded anti-metal UHF RFID tag 500 according to an embodiment, the tag including a notch slot 502 having a notch depth 518. In addition, the broadband non-folded anti-metal UHF RFID tag 500 can be configured with a resonance frequency that is substantially determined by the notch depth 518 of the broadband non-folded anti-metal UHF RFID tag 500. Figure 5D Shows the resonance frequency chart 520 of the broadband non-folded anti-metal UHF RFID tag 500 based on different notch depths 518 of the notch slot 502 according to an exemplary embodiment of the present invention. As Figure 5D shown, the line segment 508 depicts the resonance frequency at which the broadband non-folded anti-metal UHF RFID tag 500 with a notch depth 518 of 9 mm operates in the UHF range when exposed to an RF signal. Similarly, the chart 520 also depicts a line segment 522 corresponding to a notch depth 518 of 9.5 mm, a line segment 524 corresponding to a notch depth 518 of 10 mm, and a line segment 526 corresponding to a notch depth 518 of 10.5 mm. As Figure 5D shown, the chart 520 shows that the read range varies according to the change in the notch depth 518 of the notch slot 502.

[0064] Figure 5E Shows the broadband non-folded anti-metal UHF RFID tag 500 according to an embodiment, the tag including a loop 530 having a loop width 532. In addition, the broadband non-folded anti-metal UHF RFID tag 500 can be configured with a resonance frequency that is substantially determined by the loop width 532 of the loop 530 of the broadband non-folded anti-metal UHF RFID tag 500. Figure 5FShows the resonance frequency chart 534 of the broadband non - folded anti - metal UHF RFID tag 500 according to an embodiment based on different loop widths 532 of the loop 530. As Figure 5F shown, the line segment 536 plots the resonance frequencies at which the broadband non - folded anti - metal UHF RFID tag 500 with a cut - out loop width 532 of 40 mm operates in the UHF range when exposed to an RF signal. Similarly, the chart 534 also plots the line segment 538 with a loop width 532 of 42 mm, the line segment 540 with a loop width 532 of 44 mm, the line segment 542 with a loop width 532 of 46 mm, and the line segment 540 with a loop width 532 of 48 mm. As Figure 5D shown, the chart 520 shows that the read range varies with the loop width 532 of the loop 530 of the broadband non - folded anti - metal UHF RFID tag 500.

[0065] Please refer to Figure 6 , which shows a flowchart of the operation method 600 of the broadband non - folded anti - metal UHF RFID tag according to an embodiment.

[0066] In step 602, at a predefined frequency, an incoming signal is received by the antenna of the broadband non - folded anti - metal UHF RFID tag. The incoming signal is generated by an RFID reader at the predefined frequency. The predefined frequency is transmitted within the range of the antenna of the broadband non - folded anti - metal UHF RFID tag, for example, at a frequency of 860 MHz or 930 MHz.

[0067] In step 604, the received incoming signal is passed through the antenna to the RFID chip of the broadband non - folded anti - metal UHF RFID tag. The antenna can receive the incoming signal transmitted to the RFID chip through the first dipole antenna coupled to the first loop antenna and through the second dipole antenna coupled to the second loop antenna. The incoming signal is transmitted through the first dipole antenna to the first loop antenna and then to the RFID chip, and is also transmitted through the second dipole antenna to the second loop antenna and then to the RFID chip.

[0068] In step 606, in response to the received incoming signal, the RFID chip is triggered to resonate at at least two frequencies that match one by one.

[0069] In step 608, the output signal is transmitted from the RFID chip back to the antenna. The RFID chip is triggered by the incoming signal, and the output signal containing data is transmitted from the RFID chip back to the antenna.

[0070] In step 610, an output signal is radiated through the antenna. In addition, the output signal is simulated through the antenna to match the frequency of the received incoming signal and the inductive reactance of the antenna, thereby matching the inductive reactance of the RFID tag to radiate the output signal back. The RFID tag can achieve impedance matching to match the frequency of the received incoming signal and the inductive reactance of the antenna at 860 MHz and 930 MHz.

[0071] Steps 602 - 610 are for illustrative purposes only. Without departing from the scope of the claims of the present invention, other alternatives may be provided, namely adding one or more steps, deleting one or more steps, or providing one or more steps in a different order.

[0072] Reference Figure 7 , the figure shows a flowchart of a manufacturing method 700 of a broadband non - folded anti - metal UHF RFID tag according to an embodiment.

[0073] In step 702, a single metal sheet (such as an aluminum sheet or aluminum foil) is cut to form an antenna. Any conventional antenna cutting method or technique (such as die - cutting, laser cutting, etching, etc.) can be used to cut the metal sheet.

[0074] In step 704, a first dipole antenna with a first cut - out slot is constructed from the antenna, and a second dipole antenna with a second cut - out slot is constructed from the antenna.

[0075] In step 706, a first loop antenna and a second loop antenna are formed within the central region of the formed antenna.

[0076] Steps 702 - 706 are for illustrative purposes only. Without departing from the scope of the claims of the present invention, other alternatives may be provided, namely adding one or more steps, deleting one or more steps, or providing one or more steps in a different order.

[0077] In some embodiments, method 700 further includes embedding an RFID chip in the center of the central region of the antenna. In addition, the RFID chip can be configured with an antenna that can achieve the inductive reactance required for impedance matching when exposed to RF signals.

[0078] In some embodiments, the impedance matching of a predefined resonant frequency is configured to the antenna by adjusting the lengths of the first cut - out slot and the second cut - out slot, the depths of the first cut - out slot and the second cut - out slot, the lengths of the first loop antenna and the second loop antenna, and / or the load reactance of the RFID chip.

[0079] In some embodiments, impedance matching of a predefined resonance frequency is tuned by the thickness of a dielectric substrate adhered to the lower surfaces of an antenna and an RFID chip. The dielectric substrate is configured or selected for impedance matching of a predetermined resonance frequency, and the dielectric constant is also taken into account when tuning the antenna and the RFID chip.

[0080] Modifications may be made to the above-described embodiments of the present invention without departing from the scope of the invention as defined by the appended claims. Expressions used to describe and claim the present invention, such as "including", "comprising", "incorporating", "having", "is", are intended to be interpreted in a non-exclusive manner, i.e., there may also be items, components or elements that are not explicitly described. Reference to the singular may also be construed as referring to the plural.

Claims

1. A broadband non - folded metal - resistant ultra - high - frequency radio - frequency identification tag, comprising: An antenna, including a first dipole antenna having a first cut - out slot, a second dipole antenna having a second cut - out slot, and a first loop antenna and a second loop antenna disposed within the central region of the antenna; And A radio - frequency identification chip, embedded at the center of the central region of the antenna.

2. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first cut - out slot and the second cut - out slot are rectangular slots.

3. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first dipole antenna and the second dipole antenna are identical to each other.

4. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first loop antenna, the second loop antenna, the first dipole antenna, and the second dipole antenna are made of a single - piece conductive material.

5. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first loop antenna is coupled to the first dipole antenna through a first coupling region, and the second loop antenna is coupled to the second dipole antenna through a second coupling region.

6. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first loop antenna and the second loop antenna form a curved - surface rectangular shape.

7. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first loop antenna includes a first elongated slot, and the second loop antenna includes a second elongated slot.

8. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The first dipole antenna and the second dipole antenna are adjusted to resonate at a first resonance frequency, and the first loop antenna, the second loop antenna, and the radio - frequency identification chip are adjusted to resonate at a second resonance frequency.

9. The broadband non-foldable anti-metal ultra-high frequency radio frequency identification tag according to claim 1, wherein, The dielectric substrate is made of foam with a thickness of 1.3 millimeters.

10. The broadband non - folded metal - resistant ultra - high - frequency radio - frequency identification tag according to claim 1, further comprising a dielectric substrate adhered to the lower surfaces of the antenna and the radio - frequency identification chip.

11. A method of operating a broadband non - folded metal - resistant ultra - high - frequency radio - frequency identification tag, the method comprising: Receiving an incoming radio - frequency signal through the antenna of the broadband non - folded metal - resistant ultra - high - frequency radio - frequency identification tag; Transmitting the received incoming signal through the antenna to the radio - frequency identification chip of the broadband non - folded metal - resistant ultra - high - frequency radio - frequency identification tag; Responding to the received incoming signal to trigger the radio - frequency identification chip to resonate at at least one of two resonance frequencies that match one by one; Transmitting an output signal from the radio - frequency identification chip back to the antenna; And Radiating the output signal through the antenna.

12. The method according to claim 10, wherein, The incoming signal is generated by one or more radio - frequency identification readers, and each radio - frequency identification reader operates at multiple frequencies exposed under the radio - frequency signal transmitted from the radio - frequency identification reader.

13. The method according to claim 10, wherein, The antenna can resonate at multiple resonance frequencies within the ultra - high - frequency range.

14. The method according to claim 10, wherein, The incoming signal is transmitted to the radio - frequency identification chip through the first dipole antenna coupled to the first loop antenna and through the second dipole antenna coupled to the second loop antenna.

15. The method according to claim 10, wherein Responding to the received signal through the antenna to match the frequency of the received incoming signal and the inductive reactance of the antenna, thereby matching the inductive reactance of the radio - frequency identification tag to radiate back the output signal.

16. The method according to claim 10, wherein, The output signal includes data retrieved from the radio - frequency identification chip.

17. A method of manufacturing a broadband non - folded metal - resistant tag, the method comprising: Cutting a metal sheet to form an antenna; Constructing a first dipole antenna having a first cut - out slot and a second dipole antenna having a second cut - out slot from the antenna; And A first loop antenna and a second loop antenna are formed within the central region of the antenna.

18. The method according to claim 16, further comprising embedding a radio frequency identification chip in the center of the central region of the antenna.

19. The method according to claim 17, further comprising configuring the radio frequency identification chip to perform impedance matching at a resonant frequency when exposed to a radio frequency signal.

20. The method according to claim 18, wherein Impedance matching at a predefined resonant frequency is configured for the antenna by adjusting the following: The lengths of the first cut slot and the second cut slot; The depths of the first cut slot and the second cut slot; The lengths of the first loop antenna and the second loop antenna; or The load reactance of the radio frequency identification chip.

21. The method according to claim 19, wherein, The impedance matching at the predefined resonant frequency is tuned by the thickness of a dielectric substrate adhered to the lower surfaces of the antenna and the radio frequency identification chip.

22. The method according to claim 16, wherein The first loop antenna, the second loop antenna, the first dipole antenna, and the second dipole antenna are made of a single-piece conductive material.

23. The method according to claim 16, wherein The first loop antenna is coupled to the first dipole antenna through a first coupling region, and the second loop antenna is coupled to the second dipole antenna through a second coupling region.

24. The method according to claim 16, wherein The first loop antenna includes a first elongated slot, and the second loop antenna includes a second elongated slot.

25. The method according to claim 16, wherein The metal sheet is an aluminum sheet.

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