A miniaturized ultra-high frequency RFID tag

Abstract

The present invention provides a miniaturized ultra-high frequency RFID tag, comprising an antenna body, a first conductor, a second conductor and a wrapping filler; the first conductor and the second conductor are both arranged in the antenna body, and the antenna body is pre-filled with the wrapping filler, and the first conductor and the second conductor are insulated by the wrapping filler; an RFID radio frequency chip is connected to the second conductor; thus, a small-sized, high-gain and durable tag is provided.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a miniaturized ultra-high frequency RFID tag. Background Art

[0002] For the anti-metal RFID tag industry, how to make the tag antenna smaller and better in performance is the development trend and direction of the entire industry. On the one hand, the use of high-Q, high-dielectric constant substrates can achieve this goal at the expense of some bandwidth and gain; on the other hand, the use of a quarter-wavelength antenna design principle can make the size of the tag antenna smaller; or both can also achieve the above goals; or according to the characteristics of the RFID tag antenna, the use of capacitor loading is also a feasible method; conventional miniaturized anti-metal UHF RFID tags are generally composed of a quarter-wavelength microstrip antenna connected to an RFID chip to form an RFID tag, and the microstrip antenna radiation mechanism is used, and the antenna resonant frequency is as follows:

[0003] fr=C / 4L√ε

[0004] Where fr is the resonant frequency of the antenna, C is the speed of light, L is the equivalent current length of the antenna, and ε is the equivalent dielectric constant of the substrate.

[0005] However, in order to achieve the electrical length, a substrate with a high dielectric constant is required. As we all know, the higher the dielectric constant, the lower the Q value, which results in a loss of tag antenna gain.

[0006] In addition, in order to achieve the electrical length, a method such as a serpentine line is used to extend the electrical length, thereby reducing the gain of the tag antenna. Summary of the invention

[0007] The object of the present invention is to provide a miniaturized ultra-high frequency RFID tag that realizes a small wireless size and high gain of a tag antenna.

[0008] To achieve the above object, the present invention provides a miniaturized ultra-high frequency RFID tag, comprising an antenna body, a first conductor, a second conductor and a wrapping filler; the first conductor and the second conductor are both arranged in the antenna body, and the antenna body is pre-filled with the wrapping filler, and the first conductor and the second conductor are insulated by the wrapping filler;

[0009] The second conductor is connected with an RFID radio frequency chip.

[0010] Preferably, the first conductor is pre-buried in the wrapping filler.

[0011] Preferably, the first conductor includes a metal cover plate, a first metal pin and a second metal pin; the metal cover plate is physically connected to the first metal pin and the second metal pin; the first metal pin and the second metal pin are both pre-buried in the wrapping filler, the metal cover plate is half-buried in the wrapping filler, and the metal cover plate is covered on the upper surface of the antenna body.

[0012] Preferably, the metal cover plate, the first metal pin, the second metal pin and the antenna body are all made of conductors with good conductor performance, including gold, silver, copper, iron and aluminum.

[0013] Preferably, the second conductor includes a dielectric substrate, a front left metal trace, a front right metal trace, a left side metal trace, a right side metal trace and a bottom metal trace;

[0014] The dielectric substrate is preset in the metal cover plate, and the RFID radio frequency chip, the front left metal wiring, the front right metal wiring, the left side metal wiring, the right side metal wiring and the bottom metal wiring are all arranged on the dielectric substrate;

[0015] One end of the front left metal routing is connected to the left side metal routing, and the other end is connected to the RFID radio frequency chip; one end of the front right metal routing is connected to the right side metal routing, and the other end is connected to the RFID radio frequency chip; one end of the bottom metal routing is connected to the right side metal routing, and the other end is connected to the left side metal routing.

[0016] Preferably, the dielectric substrate is made of non-metallic materials with dielectric properties, including PCB boards and ceramics.

[0017] Preferably, the front left metal routing, the front right metal routing, the left side metal routing, the right side metal routing and the bottom metal routing are all made of conductors with good conductor performance, including gold, silver, copper, iron and aluminum.

[0018] Preferably, the wrapping filler is a plastic material.

[0019] Compared with the prior art, the advantages of the present invention are: compared with traditional antennas, the miniaturized UHF RFID tag antenna of the present invention has a smaller tag size, is compressed into the antenna body, has a wider range of applications, and can be applied to equipment in various fields.

[0020] The antenna of the present invention utilizes the principle of alternating the signal line of the RFID chip and the ground to form a dual-element array, thereby achieving a high signal gain effect while reducing the size of the antenna.

[0021] The antenna of the present invention adopts a wrapping design as a whole, and the two metal pins of the second conductor and the first conductor are pre-buried in the wrapping filler. The wrapping filler not only has an insulating effect, but also protects the first conductor and the second conductor. By utilizing the protective effect of the wrapping filler and the antenna body, the antenna can still maintain its integrity and enhance its durability when subjected to external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A side view of a miniaturized UHF RFID tag according to an embodiment of the present invention;

[0023] Figure 2 A top view of a miniaturized UHF RFID tag according to an embodiment of the present invention;

[0024] Figure 3 It is a cross-sectional view along the AA direction of the miniaturized UHF RFID tag in an embodiment of the present invention;

[0025] Figure 4 It is a cross-sectional view along the BB direction of the miniaturized UHF RFID tag in an embodiment of the present invention;

[0026] Figure 5 5 views of the second conductor in an embodiment of the present invention; DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0028] like Figure 1 and Figure 2 As shown, the present invention proposes a miniaturized ultra-high frequency RFID tag, including an antenna body 101, a first conductor, a second conductor and a wrapping filler 103; the first conductor and the second conductor are both arranged in the antenna body 101, and the antenna body 101 is pre-filled with the wrapping filler 103, and the first conductor and the second conductor are insulated from each other by the wrapping filler 103; the second conductor is connected to an RFID radio frequency chip 301.

[0029] In this embodiment, if Figure 3 and Figure 4 As shown, the first conductor includes a metal cover plate 102, a first metal pin 104 and a second metal pin 105; the metal cover plate 102 is physically connected to the first metal pin 104 and the second metal pin 105; the first metal pin 104 and the second metal pin 105 are both pre-buried in the wrapping filler 103, the metal cover plate 102 is half-buried in the wrapping filler, and the metal cover plate 102 is covered on the upper surface of the antenna body 101.

[0030] In addition, in this embodiment, the second conductor is entirely embedded in the wrapping filler 105, and the two metal pins of the second conductor and the first conductor are embedded in the wrapping filler. The wrapping filler not only has an insulating effect, but also protects the first conductor and the second conductor. By utilizing the protective effect of the wrapping filler and the antenna body, the antenna can still maintain its integrity and enhance its durability when subjected to external impact.

[0031] In this embodiment, the metal cover plate 102, the first metal pin 104, the second metal pin 105 and the antenna body 101 are all made of conductors with good conductor performance, including gold, silver, copper, iron and aluminum.

[0032] like Figure 5 As shown, in this embodiment, the second conductor includes a dielectric substrate 201, a front left metal trace 202, a front right metal trace 203, a left side metal trace 204, a right side metal trace 205 and a bottom metal trace 206; Figure 5 In the figure, a is the main view, b is the top view, c is the left view, d is the right view, and e is the top view.

[0033] The dielectric substrate 201 is preset in the metal cover, and the RFID radio frequency chip 301, the front left metal trace 202, the front right metal trace 203, the left side metal trace 204, the right side metal trace 205 and the bottom metal trace 206 are all arranged on the dielectric substrate 201;

[0034] One end of the front left metal trace 202 is connected to the left side metal trace 204, and the other end is connected to the RFID radio frequency chip 301; one end of the front right metal trace 203 is connected to the right side metal trace 205, and the other end is connected to the RFID radio frequency chip 301; one end of the bottom metal trace 206 is connected to the right side metal trace 205, and the other end is connected to the left side metal trace 204.

[0035] In this embodiment, the dielectric substrate 201 is made of non-metallic materials with dielectric properties, including PCB boards and ceramics.

[0036] In this embodiment, the front left metal trace 202, the front right metal trace 203, the left side metal trace 204, the right side metal trace 205 and the bottom metal trace 206 are all made of conductors with good conductor performance, including gold, silver, copper, iron and aluminum.

[0037] The antenna of the present invention uses the principle of alternating the signal line of the RFID chip and the ground to form a dual-element array; the first real element is composed of the front left metal trace 202 (as a radiation unit), the left side metal trace 204 (as the short-circuit point of the antenna), the metal trace 206 (as the GND of the antenna), and the metal trace 205 connecting the ground and the chip. The second array element is composed of metal trace 203 (as the trace for grounding the first unit chip); the second array element is composed of metal trace 203 (as the radiation unit), metal trace 205 (as the short-circuit point of the antenna), metal trace 206 (as the GND of the antenna), metal trace 204 connecting the ground and the chip, and metal trace 202 (as the trace for grounding the first unit chip), realizing a miniaturized high-gain antenna, which can achieve the effect of high signal gain on the basis of reducing the antenna volume; during the operation of the antenna, the metal cover 102, the first metal pin 104 and the second metal pin 105 will form an induced current (which has an enhanced effect on the radiation of the tag antenna) with the antenna formed by the front left metal trace 202, the front right metal trace 203, the left side metal trace 204, the right side metal trace 205 and the bottom metal trace 206, effectively extending the current length and shortening the physical size of the tag antenna in the length direction, so as to achieve a lower operating frequency under the same size and realize the miniaturization of the tag antenna.

[0038] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A miniaturized ultra-high frequency RFID tag, characterized in that: The antenna comprises an antenna body, a first conductor, a second conductor and a wrapping filler; the first conductor and the second conductor are both arranged in the antenna body, and the antenna body is pre-filled with the wrapping filler, and the first conductor and the second conductor are insulated by the wrapping filler; The second conductor is connected to an RFID radio frequency chip; The first conductor includes a metal cover plate, a first metal pin and a second metal pin; the metal cover plate is physically connected to the first metal pin and the second metal pin; the first metal pin and the second metal pin are both pre-buried in the wrapping filler, the metal cover plate is half-buried in the wrapping filler, and the metal cover plate is covered on the upper surface of the antenna body; The second conductor includes a dielectric substrate, a front left metal trace, a front right metal trace, a left side metal trace, a right side metal trace and a bottom metal trace; The dielectric substrate is preset in the metal cover plate, and the RFID radio frequency chip, the front left metal wiring, the front right metal wiring, the left side metal wiring, the right side metal wiring and the bottom metal wiring are all arranged on the dielectric substrate; One end of the front left metal trace is connected to the left side metal trace, and the other end is connected to the RFID radio frequency chip; one end of the front right metal trace is connected to the right side metal trace, and the other end is connected to the RFID radio frequency chip; one end of the bottom metal trace is connected to the right side metal trace, and the other end is connected to the left side metal trace; The second conductor is entirely pre-buried in the wrapping filler.

2. The miniaturized UHF RFID tag according to claim 1, characterized in that: The metal cover plate, the first metal pin, the second metal pin and the antenna body are all made of conductors with good conductor performance, including gold, silver, copper, iron or aluminum.

3. The miniaturized UHF RFID tag according to claim 1, characterized in that: The dielectric substrate is made of non-metallic materials with dielectric properties, including PCB boards and ceramics.

4. The miniaturized UHF RFID tag according to claim 1, characterized in that: The front left metal routing, the front right metal routing, the left side metal routing, the right side metal routing and the bottom metal routing are all made of conductors with good conductor performance, including gold, silver, copper, iron or aluminum.

5. The miniaturized UHF RFID tag according to claim 1, characterized in that: The wrapping filler is made of plastic material.

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