High-gain radio frequency tag with detection line

Abstract

The utility model relates to a high-gain radio frequency tag with detection lines, which is characterized in that detection directors (2) which are sequentially connected in series are designed and added based on the radio frequency tag, and each detection director (2) is provided with a first linear detection section (2-1) and a second linear detection section (2-2) which are perpendicular to each other and formed by two detection lines. The distance between the second linear detection section (2-2) and the ultrahigh frequency antenna (3) is adjusted by the first linear detection section (2-1), so that a radio frequency radiation field and a detection induction field are superposed in a free space, and the length of the detection section is designed to correspond to the resonant wavelength of the detection section; and the difference value between the resonant wavelength of the detection section and the resonant wavelength of the ultrahigh frequency antenna (3) is limited to be within a preset numerical value fluctuation range, so that energy radiated by the ultrahigh frequency antenna (3) can better excite induced current on the second linear detection section (2-2), and the tag function effect and the detection function effect of the overall design are further improved.

Description

Technical Field

[0001] The utility model relates to a high-gain radio frequency tag with a detection line, belonging to the technical field of radio frequency tags. Background Art

[0002] UHF RFID (Radio Frequency Identification) technology is an automatic identification technology that allows items with RFID tags to be identified and tracked through radio waves. UHF RFID technology is widely used in clothing, logistics, asset management and other fields due to its advantages such as passivity, group reading, low cost and long-distance identification. With the continuous expansion of RFID tag usage scenarios, the functions of RFID chips are becoming more and more diverse. For some special products, customers want to have the performance of UHF RFID tags themselves, but also need to protect the products. Therefore, RFID chips with broken line detection function are very suitable for such application scenarios. Generally speaking, in such application scenarios, the design of the detection line mainly considers the location and how to reduce interference with UHF RFID, but the existing design often ignores the interference between signals, which greatly affects the work efficiency in actual applications. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a high-gain radio frequency tag with a detection line, which is designed with a multi-level detection director to maximize the application efficiency of the tag function and the detection function.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model designs a high-gain radio frequency tag with a detection line, which is arranged on the surface of an object, including a radio frequency chip, an ultra-high frequency antenna, and at least one detection director, two detection wirings, wherein the ultra-high frequency antenna is arranged on the surface of the object, and two ultra-high frequency radio frequency port pins on the radio frequency chip are connected to the ultra-high frequency antenna, and each detection director is connected in series from the starting end to the end, and the starting end of the first detection director in sequence is connected to the detection port pin on the radio frequency chip, and each detection director is attached to the surface of the object.

[0005] As an optimal technical solution of the utility model: the structures of the detection directors are the same as each other. In the structure of each detection director, each detection director includes two detection wires, one end of each detection wire constitutes the two starting ends of the detection director, and the other end of each detection wire constitutes the two ending ends of the detection director, and the two detection wires are arranged to form a first straight line detection segment and a second straight line detection segment perpendicular to each other; when the detection directors are connected in series, the two starting ends of the first detection director in sequence are connected to the two detection port pins on the RF chip in a one-to-one correspondence; the two endings of the last detection director in sequence are connected to each other; when two adjacent detection directors are connected in series, the two endings of the previous detection director are respectively connected to the starting end on the same side of the next detection director.

[0006] As a preferred technical solution of the present utility model: in the structure of each detection director, the length of the second straight line detection segment is equal to the resonant wavelength of the second straight line detection segment, and the difference between the resonant wavelength of the second straight line detection segment and the resonant wavelength of the ultra-high frequency antenna belongs to the preset numerical fluctuation range.

[0007] As a preferred technical solution of the utility model: the second straight line detection sections in each detection director are parallel to each other.

[0008] As a preferred technical solution of the utility model: in the structure of each detection director, two detection lines, starting from their starting ends, are first parallel to each other, maintain a preset spacing, and are arranged along a straight line for a preset first distance, forming the first straight line detection section of the detection director; then the two detection lines are respectively turned 90 degrees outward compared to their already arranged sections and are arranged along a straight line for a preset second distance, and then turned 180 degrees outward compared to their already arranged sections and turned back to continue to be arranged along a straight line for the preset second distance and then ended, and the two sections with the same second distance arranged by the turn are parallel to each other and maintain a preset spacing; in the two sections where the two detection lines are respectively turned back, the straight lines where the two arranged sections on the same side of the two detection lines are respectively located are collinear with each other, and the two sections where the two detection lines are respectively turned back together constitute the second straight line detection section of the detection director.

[0009] As an optimal technical solution of the utility model: the UHF antenna includes a feeding body and at least one UHF radiation patch. The feeding body and each UHF radiation patch are arranged on the surface of the object. Two UHF RF port pins on the RF chip are connected to the feeding body, and each UHF radiation patch is respectively connected to the feeding body.

[0010] As a preferred technical solution of the utility model: the feeding body includes a main trace, the main trace is attached to the surface of the object, the main trace is not connected end to end, or the main trace is connected end to end to form an inductor loop, the RF chip is arranged on the main trace, and each ultra-high frequency radiation patch is connected to the main trace respectively.

[0011] As an optimal technical solution of the utility model: the feeding body also includes connecting wires whose number is equal to the number of UHF radiation patches, each connecting wire corresponds one-to-one to each UHF radiation patch, each UHF radiation patch is connected to the main wire via the corresponding connecting wire, and each connecting wire is laid along the surface of the object.

[0012] As a preferred technical solution of the utility model: the number of the UHF radiation patches is 2, the two UHF radiation patches are distributed on two sides of the feeding body opposite to each other, and the feeding body and the two UHF radiation patches are axially symmetrical as a whole.

[0013] The high-gain radio frequency tag with a detection line described in the utility model adopts the above technical solution and has the following technical effects compared with the prior art:

[0014] The utility model designs a high-gain radio frequency tag with a detection line. Based on a radio frequency chip and an ultra-high frequency antenna to realize the radio frequency tag, the utility model designs and adds various detection directors connected in series in sequence, and specifically designs each detection director to be respectively arranged by two detection wirings to form a first straight line detection section and a second straight line detection section perpendicular to each other. The first straight line detection section adjusts the distance between the second straight line detection section and the ultra-high frequency antenna, so that the radio frequency radiation field and the detection induction field are superimposed in the free space, and the length of the detection section is designed to correspond to its resonant wavelength, and the difference between the resonant wavelength of the detection section and the resonant wavelength of the ultra-high frequency antenna is limited to fall within a preset numerical fluctuation range, so that the energy radiated by the ultra-high frequency antenna can better excite the induced current on the second straight line detection section, improve the superposition effect of the radiation fields generated by the two in the free space, and thus improve the tag function effect and the detection function effect of the overall design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a high-gain radio frequency tag with a detection line designed by the utility model;

[0016] Figure 2 This is a schematic diagram of the gain of a conventional detection line UHF antenna at a resonant frequency of 915MHz;

[0017] Figure 3 It is a gain diagram of the dual-detection director embodiment of the utility model design at a resonant frequency of 915 MHz.

[0018] Among them, 1. RF chip, 2. Detection director, 2-1. First straight line detection section, 2-2. Second straight line detection section, 3. UHF antenna, 3-1. Feed body, 3-2. UHF radiation patch, 3-3. Connecting wiring. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] The utility model is designed to have a high-gain radio frequency tag with a detection line, which is set on the surface of an object. Figure 1 As shown, it includes a radio frequency chip 1, an ultra-high frequency antenna 3, and at least one detection director 2, and two detection wirings, wherein the ultra-high frequency antenna 3 is arranged on the surface of the object, and two ultra-high frequency radio frequency port pins on the radio frequency chip 1 are connected to the ultra-high frequency antenna 3, and each detection director 2 is connected in series from the starting end to the end, and the starting end of the first detection director 2 in sequence is connected to the detection port pin on the radio frequency chip 1, and each detection director 2 is attached to the surface of the object.

[0021] In practical applications, the structures of the above-mentioned detection directors 2 are designed, wherein the structures of the detection directors 2 are the same as each other, such as Figure 1 As shown, in the structure of each detection director 2, each detection director 2 includes two detection wires, one end of each detection wire constitutes the two starting ends of the detection director 2, and the other end of each detection wire constitutes the two ending ends of the detection director 2, and the two detection wires are arranged to form a first straight line detection segment 2-1 and a second straight line detection segment 2-2 which are perpendicular to each other; when the detection directors 2 are connected in series, the two starting ends of the first detection director 2 in sequence are connected to the two detection port pins on the RF chip 1 in a one-to-one correspondence; the two endings of the last detection director 2 in sequence are connected to each other; when two adjacent detection directors 2 are connected in series, the two endings of the previous detection director 2 are respectively connected to the starting end of the same side of the next detection director 2.

[0022] Regarding the structure of the two detection lines in each of the detection directors 2, in actual applications, a specific structural design is further performed, such as Figure 1 As shown, in the structure of each detection director 2, two detection lines, starting from their starting ends, are first parallel to each other, maintain a preset spacing, and are arranged along a straight line for a preset first distance, forming the first straight line detection section 2-1 of the detection director 2; then the two detection lines are respectively turned outward by 90 degrees compared with the arranged section and are arranged along a straight line for a preset second distance, and then turned outward by 180 degrees compared with the arranged section and continue to be arranged along a straight line for the preset second distance before ending, and the two sections arranged with the same second distance by the turn are parallel to each other and maintain a preset spacing; in the two sections arranged by the turn-back of the two detection lines, the straight lines where the two arranged sections on the same side of the two detection lines are respectively located are collinear with each other, and the two sections arranged by the turn-back of the two detection lines together constitute the second straight line detection section 2-2 of the detection director 2.

[0023] The design of the above-mentioned multiple detection directors 2 can improve the gain and directivity of the original UHF RFID tag in actual application, and the function of the first linear detection segment 2-1 is to adjust the distance between the second linear detection segment 2-2 and the UHF antenna 3. Under the condition of appropriate distance, the radiation field of the UHF antenna 3 and the induction field of the second linear detection segment 2-2 can be superimposed in free space.

[0024] The above structural design of the detection director 2 is further designed in practical applications, such as Figure 1 As shown, the length of the second linear detection segment 2-2 is equal to the resonant wavelength of the second linear detection segment 2-2, and the difference between the resonant wavelength of the second linear detection segment 2-2 and the resonant wavelength of the UHF antenna 3 belongs to a preset numerical fluctuation range, and the second linear detection segments 2-2 in each detection director 2 are designed to be parallel to each other. Such a design enables the energy radiated by the UHF antenna 3 to better excite the induced current on the second linear detection segment 2-2, thereby allowing the radiation fields generated by the two to be superimposed in free space.

[0025] In practical applications, the distance between the first linear detection segment 2 - 1 and the second linear detection segment 2 - 2 is adjustable, and any distance that can improve gain and directivity is reasonable.

[0026] Regarding the practical application of the above-mentioned UHF antenna 3, as shown in FIG. Figure 1 As shown, the specifically designed UHF antenna 3 includes a feeding body 3-1 and at least one UHF radiation patch 3-2. The feeding body 3-1 and each UHF radiation patch 3-2 are arranged on the surface of the object. Two UHF RF port pins on the RF chip 1 are connected to the feeding body 3-1, and each UHF radiation patch 3-2 is respectively connected to the feeding body 3-1; and for the feeding body 3-1, the design specifically includes a main routing line, and a number of connecting routing lines 3-3 equal to the number of UHF radiation patches 3-2. The main routing line is attached to the surface of the object, and the main routing lines are not connected end to end, or the main routing lines are connected end to end to form an inductor loop. The RF chip 1 is arranged on the main routing line, and each connecting routing line 3-3 corresponds to each UHF radiation patch 3-2 one by one. Each UHF radiation patch 3-2 is respectively connected to the main routing line via the corresponding connecting routing line 3-3, and each connecting routing line 3-3 is arranged along the surface of the object.

[0027] The above design is applied in practice, specifically using two UHF radiation patches 3-2, which are distributed on two opposite sides of the feeding body 3-1, and the feeding body 3-1 and the two UHF radiation patches 3-2 are axially symmetrical as a whole.

[0028] The gain of the conventional detection line UHF antenna at the resonant frequency of 915MHz is as follows Figure 2As shown, the maximum gain is 2.17 dB. The embodiment of the utility model corresponding to the dual detection director 2 is applied in practice. Figure 3 As shown, the gain at the resonant frequency of 915 MHz has a maximum gain of 3.19 dB. It can be seen that the gain of the utility model design at the resonant frequency is improved by about 1 dB compared with the conventional detection line ultra-high frequency antenna.

[0029] The high-gain RFID tag with a detection line designed in the above technical solution realizes the RFID tag based on the RFID chip 1 and the UHF antenna 3, and is designed to add detection directors 2 connected in series in sequence, and specifically design each detection director 2 to be respectively arranged by two detection wirings to form a first straight line detection segment 2-1 and a second straight line detection segment 2-2 perpendicular to each other, and the first straight line detection segment 2-1 adjusts the distance between the second straight line detection segment 2-2 and the UHF antenna 3, so that the RF radiation field and the detection induction field are superimposed in the free space, and the length of the detection segment is designed to correspond to its resonant wavelength, and the difference between the resonant wavelength of the detection segment and the resonant wavelength of the UHF antenna 3 is limited to fall within a preset numerical fluctuation range, so that the energy radiated by the UHF antenna 3 can better excite the induced current on the second straight line detection segment 2-2, thereby improving the superposition effect of the radiation fields generated by the two in the free space, thereby improving the tag function effect and the detection function effect of the overall design.

[0030] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A high-gain radio frequency tag with a detection line, arranged on the surface of an object, characterized in that: The invention comprises a radio frequency chip (1), an ultra-high frequency antenna (3), and at least one detection director (2), and two detection wirings, wherein the ultra-high frequency antenna (3) is arranged on the surface of the object, two ultra-high frequency radio frequency port pins on the radio frequency chip (1) are connected to the ultra-high frequency antenna (3), and the detection directors (2) are connected in series from the starting end to the end, and the starting end of the first detection director (2) in sequence is connected to the detection port pin on the radio frequency chip (1), and each detection director (2) is attached to the surface of the object.

2. A high-gain radio frequency tag with a detection line according to claim 1, characterized in that: The structures of the detection directors (2) are the same as each other. In the structures of the detection directors (2), each detection director (2) comprises two detection traces, one end of each detection trace constitutes two starting ends of the detection director (2), and the other end of each detection trace constitutes two ending ends of the detection director (2). The two detection traces are arranged to form a first straight line detection section (2-1) and a second straight line detection section (2-2) perpendicular to each other. When the detection directors (2) are connected in series, the two starting ends of the first detection director (2) in sequence are connected to the two detection port pins on the radio frequency chip (1) in a one-to-one correspondence manner; the two ending ends of the last detection director (2) in sequence are connected to each other; when two adjacent detection directors (2) are connected in series, the two ending ends of the first detection director (2) are connected to the starting end on the same side of the next detection director (2).

3. A high-gain radio frequency tag with a detection line according to claim 2, characterized in that: In the structure of each detection director (2), the length of the second linear detection segment (2-2) is equal to the resonant wavelength of the second linear detection segment (2-2), and the difference between the resonant wavelength of the second linear detection segment (2-2) and the resonant wavelength of the ultra-high frequency antenna (3) is within a preset value fluctuation range.

4. A high-gain radio frequency tag with a detection line according to claim 2, characterized in that: The second straight line detection sections (2-2) in each detection director (2) are parallel to each other.

5. A high-gain radio frequency tag with a detection line according to any one of claims 2 to 3, characterized in that: In the structure of each detection director (2), two detection lines are first arranged parallel to each other and maintain a preset spacing from their starting ends, and are arranged along a straight line for a preset first distance, thereby forming a first straight line detection section (2-1) of the detection director (2); then the two detection lines are respectively turned outward by 90 degrees compared to the already arranged section and arranged along a straight line for a preset second distance, and then turned outward by 180 degrees compared to the already arranged section and turned back to continue to be arranged along a straight line for the preset second distance before ending, and the two sections arranged for the same second distance by the turning back are parallel to each other and maintain a preset spacing; in the two sections arranged by the turning back of the two detection lines, the straight lines where the two arranged sections on the same side of the two detection lines are respectively located are collinear with each other, and the two sections arranged by the turning back of the two detection lines together form a second straight line detection section (2-2) of the detection director (2).

6. A high-gain radio frequency tag with a detection line according to claim 1, characterized in that: The UHF antenna (3) comprises a feeding body (3-1) and at least one UHF radiation patch (3-2); the feeding body (3-1) and each UHF radiation patch (3-2) are arranged on the surface of an object; two UHF radio frequency port pins on the radio frequency chip (1) are connected to the feeding body (3-1); and each UHF radiation patch (3-2) is respectively connected to the feeding body (3-1).

7. A high-gain radio frequency tag with a detection line according to claim 6, characterized in that: The feeding body (3-1) comprises a main line, which is attached to the surface of an object, and the main line is not connected end to end, or the main line is connected end to end to form an inductor loop, the radio frequency chip (1) is arranged on the main line, and each ultra-high frequency radiation patch (3-2) is connected to the main line respectively.

8. A high-gain radio frequency tag with a detection line according to claim 7, characterized in that: The power feeding body (3-1) further comprises connection lines (3-3) whose number is equal to the number of the ultra-high frequency radiation patches (3-2), each connection line (3-3) corresponds to each ultra-high frequency radiation patch (3-2) one by one, each ultra-high frequency radiation patch (3-2) is connected to the main line via a corresponding connection line (3-3), and each connection line (3-3) is arranged along the surface of the object.

9. A high-gain radio frequency tag with a detection line according to claim 6 or 8, characterized in that: The number of the ultra-high frequency radiation patches (3-2) is 2, the two ultra-high frequency radiation patches (3-2) are distributed on two opposite sides of the feeding body (3-1), and the feeding body (3-1) and the two ultra-high frequency radiation patches (3-2) are axially symmetrical as a whole.

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