RFID tag with article opening detection function

Abstract

The utility model relates to an RFID (Radio Frequency Identification) tag with article opening detection, which is based on a radio frequency chip (1) with double detection end pins, realizes the RFID tag, introduces a closed-loop wire to cross each opening on the surface of an article to be arranged, realizes simultaneous detection of multiple openings, introduces a gap bridge structure, realizes distribution of detection wires along the front and back surfaces of the article, and realizes detection of the article. All openings in the front and back faces of an article are comprehensively detected, radiation of an antenna in the work of the RFID tag is considered, detection routing is designed not to be crossed with the space of the radiation antenna, the influence of a radio frequency radiation signal is reduced to the maximum extent, meanwhile, all-directional detection of multiple openings in the surfaces of the article is achieved, and the actual application efficiency of designing the radio frequency tag is improved.

Description

Technical Field

[0001] The utility model relates to an RFID tag with object opening detection function, belonging to the technical field of radio frequency tags. Background Art

[0002] Ultra-high frequency RFID (Radio Frequency Identification) technology is an automatic identification technology that allows items with RFID tags to be identified and tracked through radio waves. Ultra-high frequency 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.

[0003] Products with integrated UHF RFID tags are equivalent to having a globally unique serial number, so the production, transportation, storage, and sales of the product are all traceable. However, when the tag is damaged, the RFID loses its original performance. For some special products, such as wine, lead seals, gift boxes, etc., customers do not want to damage the performance of UHF RFID, but also want to know whether these products have been opened before reaching the end user. Especially when there is more than one opening on the product, the existing technology needs to detect multiple openings at the same time. The complex winding structure will not only increase the size of the tag, resulting in an increase in manufacturing costs, but also interfere with the original performance of the UHF RFID tag. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an RFID tag with object opening detection, based on a radio frequency chip with dual detection end pins and a reasonable wiring scheme, which can efficiently realize simultaneous detection of multiple openings.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model designs an RFID tag with object opening detection, including a radio frequency chip, a feeding body, a first detection trace, and at least one far-field radiating antenna, wherein the feeding body is arranged on the surface of the object, based on the definition that the surface of the feeding body on the object is the first surface, and the radio frequency chip is arranged on the feeding body; each far-field radiating antenna is arranged on the first surface of the object, and each far-field radiating antenna is respectively connected to the feeding body; one end of the first detection trace is connected to one of the detection end pins on the radio frequency chip, the first detection trace is arranged along the first surface of the object and across each opening on the first surface of the object, the other end of the first detection trace is connected to another detection end pin on the radio frequency chip, and each far-field radiating antenna does not form a spatial intersection with the first detection trace.

[0006] As a preferred technical solution of the utility model: it also includes a second detection line, a third detection line, a first bridge, a second bridge, a third bridge, and a fourth bridge. Based on the definition that the other surface of the object opposite to the first surface is the second surface, the first bridge and the second bridge are respectively arranged on the first surface of the object, the third bridge and the fourth bridge are respectively arranged on the second surface of the object, the first bridge and the third bridge are opposite to each other and are conductively connected to each other through the surface of the object, the second bridge and the fourth bridge are opposite to each other and are conductively connected to each other through the surface of the object, and the other end of the first detection line is opposite to the first bridge. The first detection line is connected to the first bridge, one end of the second detection line is connected to the third bridge, the other end of the second detection line is connected to the fourth bridge, one end of the third detection line is connected to the second bridge, and the other end of the third detection line is connected to one of the detection end pins on the RF chip. The first detection line and the third detection line are arranged along the first surface of the article and across each opening on the first surface of the article, and the second detection line is arranged along the second surface of the article and across each opening on the second surface of the article. There is no spatial intersection between each far-field radiation antenna and the first detection line, the second detection line, and the third detection line.

[0007] As a preferred technical solution of the utility model: the feeding body includes a main routing line, the main routing line is attached to the first surface of the object, the main routing line is not connected end to end, or the main routing line is connected end to end to form a near-field coupling inductor loop, the RF chip is arranged on the main routing line, and each far-field radiating antenna is connected to the main routing line respectively.

[0008] As a preferred technical solution of the utility model: the feeding body also includes connecting wires whose number is equal to the number of far-field radiating antennas, each connecting wire corresponds one-to-one to each far-field radiating antenna, each far-field radiating antenna is connected to the main wire via the corresponding connecting wire, and each connecting wire is arranged along the first surface of the article.

[0009] As a preferred technical solution of the utility model: the number of the far-field radiating antennas is 2, the two far-field radiating antennas are distributed on two opposite sides of the feeding body, and the feeding body and the two far-field radiating antennas are axially symmetrical as a whole.

[0010] The RFID tag with object opening detection described in the utility model adopts the above technical solution and has the following technical effects compared with the prior art:

[0011] The utility model designs an RFID tag with object opening detection. The RFID tag is implemented based on a radio frequency chip with dual detection end pins. At the same time, a closed-loop routing is introduced to cross various openings on the surface of the object for layout, so as to realize simultaneous detection of multiple openings. A bridge structure is introduced to realize detection line distribution along the front and back sides of the object, so as to realize comprehensive detection of various openings on the front and back sides of the object. In addition, considering the radiation of the antenna during the operation of the RFID tag, the detection routing is designed not to cross the radiation antenna space, so as to minimize the influence of the radio frequency radiation signal, realize all-round detection of multiple surfaces and multiple openings of the object, and improve the practical application efficiency of the designed radio frequency tag. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure corresponding to the first surface of the article in the design of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure corresponding to the second surface of the article in the design of the utility model;

[0014] Figure 3 It is a schematic diagram of the structure of the corresponding article in the utility model design;

[0015] Among them, 1. RF chip, 2. First detection trace, 3. Far-field radiation antenna, 4. Second detection trace, 5. Third detection trace, 6. First bridge, 7. Second bridge, 8. Third bridge, 9. Fourth bridge, 10. Near-field coupling inductor loop, 11. Connection trace. DETAILED DESCRIPTION

[0016] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] The utility model is designed to provide an RFID tag with object opening detection. In practical applications, Figure 1 As shown, the specific design includes a radio frequency chip 1, a feeding body, a first detection trace 2, and at least one far-field radiation antenna 3, wherein the feeding body is arranged on the surface of the object, based on the definition that the surface of the feeding body on the object is the first surface, and the radio frequency chip 1 is arranged on the feeding body; each far-field radiation antenna 3 is arranged on the first surface of the object, and each far-field radiation antenna 3 is respectively connected to the feeding body; one end of the first detection trace 2 is connected to one of the detection end pins on the radio frequency chip 1, the first detection trace 2 is arranged along the first surface of the object and across each opening on the first surface of the object, the other end of the first detection trace 2 is connected to another detection end pin on the radio frequency chip 1, and each far-field radiation antenna 3 does not form a spatial intersection with the first detection trace 2, that is, the first detection trace 2 is prevented from affecting the performance of the radio frequency tag.

[0018] In practical applications, in addition to the above-mentioned single-surface detection routing design, a front and back double-surface design is further designed, such as Figures 1 to 3 As shown, the design also includes a second detection line 4, a third detection line 5, a first bridge 6, a second bridge 7, a third bridge 8, and a fourth bridge 9. Based on the definition that the other surface of the object opposite to the first surface is the second surface, the first bridge 6 and the second bridge 7 are respectively arranged on the first surface of the object, the third bridge 8 and the fourth bridge 9 are respectively arranged on the second surface of the object, the first bridge 6 and the third bridge 8 are opposite to each other and are conductively connected to each other through the surface of the object, the second bridge 7 and the fourth bridge 9 are opposite to each other and are conductively connected to each other through the surface of the object, the other end of the first detection line 2 is connected to the first bridge 6, and one end of the second detection line 4 is connected to the third bridge 8 The other end of the second detection trace 4 is connected to the fourth bridge 9, one end of the third detection trace 5 is connected to the second bridge 7, the other end of the third detection trace 5 is connected to one of the detection end pins on the RF chip 1, the first detection trace 2 and the third detection trace 5 are arranged along the first surface of the article and across each opening on the first surface of the article, the second detection trace 4 is arranged along the second surface of the article and across each opening on the second surface of the article, and each far-field radiation antenna 3 does not form a spatial intersection with the first detection trace 2, the second detection trace 4, and the third detection trace 5, respectively, that is, the first detection trace 2, the second detection trace 4, and the third detection trace 5 are prevented from affecting the performance of the RF tag.

[0019] The above-mentioned design for the two square surfaces of the object expands the coverage of the detection line, effectively avoiding the cost increase caused by the conventional surrounding detection line and the interference with the UHF RFID tag.

[0020] According to the path layout design of the above-mentioned detection lines, any position on the path is destroyed, which can be detected by the detection line designed in the utility model. In addition to the above-mentioned design of the detection line, the feeding part is designed next. The specific design of the feeding body includes a main line, which is attached to the first surface of the object. The main line is not connected at the beginning and the end, or the main line is connected at the beginning and the end to form a near-field coupling inductor loop 10. The radio frequency chip 1 is arranged on the main line, and each far-field radiating antenna 3 is connected to the main line respectively.

[0021] In practical applications, such as Figure 1 As shown, the feeding body is further designed to include connecting wires 11 whose number is equal to the number of far-field radiating antennas 3, and each connecting wire 11 corresponds one-to-one to each far-field radiating antenna 3. Each far-field radiating antenna 3 is connected to the main wire via the corresponding connecting wire 11, and each connecting wire 11 is arranged along the first surface of the object.

[0022] The above-mentioned RFID tag with object opening detection is applied in practice, such as Figures 1 to 3 As shown, two far-field radiating antennas 3 are specifically used, and the two far-field radiating antennas 3 are distributed on two sides of the feeding body opposite to each other, and the feeding body and the two far-field radiating antennas 3 are axially symmetrical as a whole, and in application, it is required that each detection line does not form a spatial intersection with any far-field radiating antenna 3, and in actual application, the RFID tag is designed to be applied to the surface of an insulating object, and in the connection structure between the detection line and the bridge, it can be riveted, copper-plated vias, etc.

[0023] The above technical solution designs an RFID tag with object opening detection. Based on the radio frequency chip 1 with dual detection end pins, while realizing the RFID tag, a closed-loop routing is introduced to cross the openings on the surface of the object for layout, so as to realize simultaneous detection of multiple openings, and a bridge structure is introduced to realize the distribution of detection lines along the front and back sides of the object, so as to realize comprehensive detection of each opening on the front and back sides of the object. In addition, considering the radiation of the antenna during the operation of the RFID tag, the detection routing is designed not to cross the radiation antenna space, so as to minimize the influence of the radio frequency radiation signal, realize all-round detection of multiple surfaces and multiple openings of the object, and improve the actual application efficiency of the designed radio frequency tag.

[0024] 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. An RFID tag capable of detecting the opening of an object, characterized in that: The invention comprises a radio frequency chip (1), a feed body, a first detection trace (2), and at least one far-field radiation antenna (3), wherein the feed body is arranged on the surface of the object, based on the definition that the surface of the feed body on the object is the first surface, and the radio frequency chip (1) is arranged on the feed body; each far-field radiation antenna (3) is arranged on the first surface of the object, and each far-field radiation antenna (3) is respectively connected to the feed body; one end of the first detection trace (2) is connected to one of the detection end pins on the radio frequency chip (1), the first detection trace (2) is arranged along the first surface of the object and across each opening on the first surface of the object, the other end of the first detection trace (2) is connected to another detection end pin on the radio frequency chip (1), and each far-field radiation antenna (3) does not form a spatial intersection with the first detection trace (2).

2. The RFID tag with object opening detection according to claim 1, characterized in that: The invention also includes a second detection line (4), a third detection line (5), a first bridge (6), a second bridge (7), a third bridge (8), and a fourth bridge (9), wherein the other surface of the object opposite to the first surface is defined as the second surface, the first bridge (6) and the second bridge (7) are respectively arranged on the first surface of the object, the third bridge (8) and the fourth bridge (9) are respectively arranged on the second surface of the object, the first bridge (6) and the third bridge (8) are opposite to each other and are electrically connected to each other through the surface of the object, the second bridge (7) and the fourth bridge (9) are opposite to each other and are electrically connected to each other through the surface of the object, the other end of the first detection line (2) is connected to the first bridge (6), and the third bridge (8) and the fourth bridge (9) are opposite to each other and are electrically connected to each other through the surface of the object. One end of the second detection trace (4) is connected to the third bridge (8), the other end of the second detection trace (4) is connected to the fourth bridge (9), one end of the third detection trace (5) is connected to the second bridge (7), and the other end of the third detection trace (5) is connected to one of the detection end pins on the radio frequency chip (1). The first detection trace (2) and the third detection trace (5) are arranged along the first surface of the object and across each opening on the first surface of the object. The second detection trace (4) is arranged along the second surface of the object and across each opening on the second surface of the object. Each far-field radiation antenna (3) does not form a spatial intersection with the first detection trace (2), the second detection trace (4), and the third detection trace (5).

3. The RFID tag with object opening detection according to claim 1, characterized in that: The feeding body comprises a main line, the main line is attached to the first surface of the object, the main line is not connected end to end, or the main line is connected end to end to form a near-field coupling inductor loop (10), the radio frequency chip (1) is arranged on the main line, and each far-field radiation antenna (3) is connected to the main line respectively.

4. The RFID tag with object opening detection according to claim 3, characterized in that: The feeding body further comprises connection lines (11) whose number is equal to the number of far-field radiating antennas (3), each connection line (11) corresponds to each far-field radiating antenna (3) on a one-to-one basis, each far-field radiating antenna (3) is connected to the main line via a corresponding connection line (11), and each connection line (11) is arranged along the first surface of the object.

5. The RFID tag with object opening detection according to claim 1 or 4, characterized in that: The number of the far-field radiating antennas (3) is 2, and the two far-field radiating antennas (3) are distributed on two sides of the feeding body that are opposite to each other, and the feeding body and the two far-field radiating antennas (3) are axially symmetrical as a whole.

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