Antenna positioning device

Abstract

The utility model belongs to the technical field of radio frequency positioning, and particularly discloses an antenna positioning device, which comprises a reader-writer used for transmitting a control signal; the main antenna is electrically connected with the reader-writer and is used for transmitting a first wave beam according to the control signal; the label assembly is used for receiving the first wave beam and transmitting a third wave beam; the passive reflecting surface is used for receiving the third wave beam and reflecting a fourth wave beam; and the main antenna is also used for receiving the third wave beam and the fourth wave beam and transmitting the third wave beam and the fourth wave beam to the reader-writer. The antenna positioning device provided by the utility model can solve the technical problems that the ultrahigh frequency RFID technology in the prior art is single in data identification dimension and not accurate enough in label positioning.

Description

Technical Field

[0001] This application belongs to the technical field of radio frequency positioning, and particularly relates to an antenna positioning device. Background Art

[0002] Ultra-high frequency RFID (Radio Frequency Identification) technology is one of the mainstream RFID technologies at present. Due to its high frequency and short wavelength, compared with high-frequency RFID technology, it has high identification accuracy and small antenna size, and can be integrated into scenarios such as intelligent access control, tunnel machines, and passage machines for use, realizing fast multi-tag identification and improving the efficiency of item identification or inventory. At present, ultra-high frequency RFID technology is mainly used for fast identification of single or multiple tags of goods in retail, warehousing, and logistics application scenarios. The identification data dimension is based on the received signal strength indication (RSSI) emitted by the tag, and the data dimension is single, and the positioning of the tag is not accurate enough. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide an antenna positioning device to solve the technical problem in the prior art that the ultra-high frequency RFID technology has a single identification data dimension and the positioning of the tag is not accurate enough.

[0004] To achieve the above purpose, the embodiments of this application provide an antenna positioning device, including: a reader-writer for transmitting a control signal; a main antenna electrically connected to the reader-writer for transmitting a first beam according to the control signal; a tag assembly for receiving the first beam and emitting a third beam; a passive reflector for receiving the third beam and reflecting a fourth beam; the main antenna is further configured to receive the third beam and the fourth beam and transmit them to the reader-writer.

[0005] In some embodiments, the antenna positioning device further includes a secondary antenna electrically connected to the reader-writer. The secondary antenna is configured to transmit a second beam according to the control signal; the tag assembly is further configured to receive the second beam and emit the third beam; the secondary antenna is further configured to receive the third beam and the fourth beam and transmit them to the reader-writer.

[0006] In some embodiments, the distance between the main antenna and the secondary antenna is d1, and the value range of d1 is: 2λ ≤ d1 ≤ 3λ, where λ is the wavelength of the antenna positioning device.

[0007] In some embodiments, the antenna positioning device includes a plurality of the secondary antennas, and the plurality of secondary antennas are arranged around the main antenna to increase the coverage area of the second beam.

[0008] In some embodiments, the main antenna and the tag assembly are spaced apart, and at least a part of the passive reflecting surface is disposed between the main antenna and the tag assembly.

[0009] In some embodiments, the normal direction of the passive reflecting surface is perpendicular to the spacing direction between the main antenna and the tag assembly; and / or, the antenna positioning device includes a plurality of the passive reflecting surfaces.

[0010] In some embodiments, the distance between the passive reflecting surface and the main antenna is d2, and the value range of d2 is: 8λ ≤ d2 ≤ 10λ, where λ is the wavelength of the antenna positioning device.

[0011] In some embodiments, the tag assembly is disposed on one side of the main antenna along a first direction, and the sub-antenna is disposed on one side of the main antenna along a direction perpendicular to the first direction.

[0012] In some embodiments, the antenna positioning device includes a beamforming device, the beamforming device is electrically connected to each of the reader, the main antenna, and the sub-antenna, and the beamforming device is configured to control the main antenna and the sub-antenna to respectively transmit the first beam and the second beam according to the control signal.

[0013] In some embodiments, the passive reflecting surface includes an intelligent reflecting surface.

[0014] The beneficial effect of the antenna positioning device provided by this application is that: by setting a passive reflecting surface to reflect the beam emitted by the tag assembly into the main antenna, the main antenna can receive the third beam directly emitted by the same tag in the tag assembly and the fourth beam reflected by the passive reflecting surface. The position of the tag can be determined by two beams respectively. Compared with using one beam to determine the position of the tag, after the positions of the tag are determined by two beams and then fused, the positioning error can be reduced and the positioning accuracy can be improved, and the technical problem that the ultra-high frequency RFID technology in the prior art has a single dimension of identified data and the positioning of the tag is not accurate enough can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of an antenna positioning device provided by some embodiments of the present application Figure 1 ;

[0017] Figure 2 Schematic diagram of the antenna positioning device provided by some embodiments of the present application Figure 2 .

[0018] Among them, each reference numeral in the figure:

[0019] 100, antenna positioning device;

[0020] 10, reader-writer;

[0021] 20, beamforming device

[0022] 30, main antenna;

[0023] 40, sub-antenna;

[0024] 50, passive reflector;

[0025] 60, tag assembly; 61, positioning tag; 62, calibration tag;

[0026] 70, support;

[0027] 81, first beam; 82, second beam; 83, third beam; 84, fourth beam. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0032] The antenna positioning device is used to position the electronic tag and the article with the electronic tag. The antenna positioning device can locate the position of the commodity and judge the trajectory of the commodity in scenarios such as retail, warehousing, and logistics; the antenna positioning device can also locate the position of personnel or articles in scenarios such as intelligent access control, tunnel machines, and passage machines.

[0033] An existing antenna positioning device mainly outputs a control signal from an RFID reader-writer to an RFID single antenna, causing the RFID single antenna to generate a radiation beam. The coverage range of this radiation beam is relatively large, and within the coverage range, the RFID electronic tag is identified. The electronic tag transmits the corresponding information through the RFID single antenna to the RFID reader-writer, and the RFID reader-writer locates the position of the electronic tag based on the information transmitted by the electronic tag.

[0034] Another existing antenna positioning device mainly outputs a control signal from an RFID reader-writer to an RFID beamforming module for the read-write beam, causing the RFID beamforming module for the read-write beam to generate a radiation scanning beam. This scanning beam can scan the possible range where the RFID electronic tag may be located, and within the scanning range, the RFID electronic tag is identified. The electronic tag transmits the corresponding information through the RFID beamforming module for the read-write beam to the RFID reader-writer, and the RFID reader-writer locates the position of the electronic tag based on the information transmitted by the electronic tag.

[0035] Both of the above two methods locate the electronic tag based on the information (beam) in one direction transmitted by the electronic tag, resulting in a relatively large positioning error.

[0036] An embodiment of this application provides an antenna positioning device. Please refer to Figure 1 , the antenna positioning device 100 includes a reader-writer 10, a main antenna 30, and a tag assembly 60. The reader-writer 10 can transmit a control signal. The main antenna 30 is electrically connected to the reader-writer 10. The main antenna 30 can transmit a first beam 81 according to the control signal. The tag assembly 60 can receive the first beam 81 and transmit a third beam 83.

[0037] The control signal transmitted by the reader / writer 10 is the radio frequency signal sent by the reader / writer 10 to the antenna. The control signal transmitted by the reader / writer 10 can control the main antenna 30 to emit a specific beam. The reader / writer 10 can also receive the beam transmitted by the electronic tag in the tag assembly 60 and transmitted by the main antenna 30, and calculate the position of the electronic tag according to the received beam.

[0038] That is to say, the tag assembly 60 includes an electronic tag. It can be understood that after receiving the first beam 81, the electronic tag emits a specific third beam 83 according to the encoded information stored internally. Optionally, the electronic tag can include a positioning tag 61 and a calibration tag 62 fixedly arranged. The positioning tag 61 is arranged on the item to be positioned and can move with the item; the calibration tag 62 is a reference point and can store the relevant information of the reference point to determine the area where the positioning tag 61 is located. Optionally, different positioning tags 61 can be arranged on different items, and the encoded information related to the item where they are located is stored in different positioning tags 61. Then, different positioning tags 61 can emit different third beams 83, and the reader / writer 10 can locate the position of the item corresponding to the beam according to the received specific beam.

[0039] It can be understood that the first beam 81 has the same frequency as the control signal, and the first beam 81 is used to detect the position of the electronic tag.

[0040] In some embodiments, the antenna positioning device 100 provided by the embodiments of the present application further includes a support member 70, and the main antenna 30 is mounted on the support member 70. The main antenna 30 is connected to a beamforming device 20. The input end of the beamforming device 20 is electrically connected to the reader / writer 10, and the output end of the beamforming device 20 is electrically connected to the main antenna 30. Among them, the beamforming device 20 can control the first beam 81 to scan in a specific shape, so that the first beam 81 performs beam focusing on a single electronic tag or a tag cluster composed of multiple electronic tags in the near field.

[0041] The antenna positioning device 100 provided by the embodiments of the present application further includes a passive reflector 50. The passive reflector 50 can receive the third beam 83 and reflect a fourth beam 84; the main antenna 30 can also receive the third beam 83 and the fourth beam 84 and transmit them to the reader / writer 10.

[0042] It can be understood that the fourth beam 84 is the reflected wave of the third beam 83, so the angles between the third beam 83 and the fourth beam 84 and the normal line of the passive reflector 50 are equal; the main antenna 30 and the tag assembly 60 are arranged at intervals, and the normal direction X of the passive reflector 50 intersects with the interval direction Y between the main antenna 30 and the tag assembly 60, so that the fourth beam 84 reflected by the passive reflector 50 can be directed to the main antenna 30, and the main antenna 30 transmits the fourth beam 84 to the reader / writer 10.

[0043] The method for locating the electronic tag is as follows: The reader 10 locates the spatial positions of the electronic tags according to the received third beam 83 and fourth beam 84 respectively, and then fuses the spatial positions of multiple electronic tags to obtain the final spatial position.

[0044] Optionally, the method for the reader 10 to locate the electronic tag according to the received third beam 83 is as follows: The reader 10 locates the direction of the electronic tag relative to the main antenna 30 according to the angle at which the third beam 83 shoots towards the main antenna 30, and the reader 10 locates the distance of the electronic tag relative to the main antenna 30 according to the intensity of the third beam 83, so as to locate the spatial position of the electronic tag.

[0045] Optionally, the method for the reader 10 to locate the electronic tag according to the received fourth beam 84 is as follows: The reader 10 calculates the angle of the fourth beam 84 relative to the passive reflector 50 according to the angle of the fourth beam 84 relative to the main antenna 30 and the specific installation position of the passive reflector 50 (including spatial position information and angle information), and then can calculate the angle of the third beam 83 relative to the passive reflector 50 before the fourth beam 84 is reflected, that is, obtain the direction of the third beam 83. The reader 10 can locate the direction of the electronic tag relative to the passive reflector 50 according to the direction of the third beam 83. The reader 10 can calculate the total distance that the beam emitted by the electronic tag reaches the main antenna 30 after being reflected by the passive reflector 50 according to the signal intensity of the fourth beam 84 and the specific installation position of the passive reflector 50 (including spatial position information and angle information). After obtaining the above total distance, the reader 10 can calculate the distance between the electronic tag and the passive reflector 50 according to the distance between the passive reflector 50 and the main antenna 30. The reader 10 can then locate the spatial position of the electronic tag by combining the direction of the electronic tag relative to the passive reflector 50.

[0046] The beneficial effect of this embodiment is as follows: The antenna positioning device 100 provided by the embodiment of the present application reflects the beam emitted by the tag component 60 into the main antenna 30 by setting the passive reflector 50, so that the main antenna 30 can receive the third beam 83 directly emitted by the same tag in the tag component 60 and the fourth beam 84 reflected by the passive reflector 50, and can determine the position of the tag through two beams respectively. Compared with using one beam to determine the position of the tag, the antenna positioning device provided by the embodiment of the present application uses two beams to determine the position of the tag and then fuses them, which can reduce the positioning error and improve the positioning accuracy, and can solve the technical problem that the ultra-high frequency RFID technology in the prior art has a single dimension of identified data and the positioning of the tag is not accurate enough. Compared with using multiple single antennas, the present application is simpler, has lower cost, and reduces the situation of misreading electronic tags caused by leakage of redundant electromagnetic energy.

[0047] In some embodiments, please refer to Figure 2, the antenna positioning device 100 further includes a secondary antenna 40. The secondary antenna 40 is electrically connected to the reader 10. The secondary antenna 40 can transmit a second beam 82 according to a control signal. The tag assembly 60 can receive the second beam 82 and transmit a third beam 83. The secondary antenna 40 can also receive the third beam 83 and a fourth beam 84 and transmit them to the reader 10.

[0048] It can be understood that the frequency of the second beam 82 is the same as that of the control signal. The second beam 82 and the first beam 81 have the same function, and both can cause the electronic tag in the tag assembly 60 to emit a third beam 83. The second beam 82 is mainly used to detect the range outside the first beam 81. Optionally, the second beam 82 is a near-field beam.

[0049] The method for the reader 10 to locate the electronic tag according to the secondary antenna 40 is the same as the method for the reader 10 to locate the electronic tag according to the main antenna 30. That is, the reader 10 locates the spatial position of the electronic tag according to the third beam 83 emitted by the same electronic tag to the main antenna 30 and the secondary antenna 40, and the fourth beam 84 after reflection of the third beam 83, and then fuses multiple spatial positions to obtain the final spatial position of the electronic tag.

[0050] The beneficial effects of this embodiment are as follows: The antenna positioning device 100 provided by the embodiment of the present application can increase the detection range of the antenna positioning device 100 for tags by transmitting the second beam 82 complementary to the first beam 81 through the secondary antenna 40. The secondary antenna 40 receives the third beam 83 and the fourth beam 84, which can increase the receiving area of the effective signal, enable the reader 10 to locate the spatial position of the electronic tag according to the secondary antenna 40, can fuse the spatial positions of more electronic tags, further reduce the positioning error of the electronic tag, and improve the positioning accuracy.

[0051] In some embodiments, please refer to Figure 2 , the distance between the main antenna 30 and the secondary antenna 40 is d1, and the value range of d1 is: 2λ ≤ d1 ≤ 3λ, where λ is the wavelength of the antenna positioning device 100.

[0052] The wavelength of the antenna positioning device 100 is the wavelength of the control signal transmitted by the reader 10.

[0053] Optionally, d1 is 2λ, 2.5λ or 3λ.

[0054] Optionally, the secondary antenna 40 and the main antenna 30 are installed on the same support 70 to make the antenna positioning device 100 more concentrated.

[0055] The beneficial effects of this embodiment are as follows: The antenna positioning device 100 provided by the embodiment of the present application limits the distance between the main antenna 30 and the sub-antenna 40 within the above range, enabling the main antenna 30 and the sub-antenna 40 to be centrally arranged. At the same time, the main antenna 30 and the sub-antenna 40 can perform tag positioning at different positions, increasing the difference in the spatial positions located by the main antenna 30 and the sub-antenna 40, and making the final fused spatial position more accurate.

[0056] In some embodiments, please refer to Figure 2 , the antenna positioning device 100 includes a plurality of sub-antennas 40, and the plurality of sub-antennas 40 are arranged around the main antenna 30 to increase the coverage area of the second beam 82.

[0057] It can be understood that the sub-antennas 40 can be distributed around the main antenna 30 along the axes in different directions. Optionally, the sub-antennas can be distributed around the interval direction Y between the main antenna 30 and the tag assembly 60, or can be distributed around a direction that forms an angle with the interval direction Y between the main antenna 30 and the tag assembly 60. The sub-antennas 40 emit the second beam 82 complementary to the main antenna 30 from different positions around the main antenna 30.

[0058] The beneficial effects of this embodiment are as follows: The antenna positioning device 100 provided by the embodiment of the present application can receive the third beam 83 and the fourth beam 84 at multiple positions by setting a plurality of sub-antennas 40, increasing the spatial positions obtained when the reader 10 locates the same electronic tag, and making the final fused spatial position more accurate.

[0059] In some embodiments, please refer to Figure 1 and Figure 2 , the main antenna 30 and the tag assembly 60 are arranged at an interval, and at least part of the passive reflector 50 is disposed between the main antenna 30 and the tag assembly 60.

[0060] It can be understood that a part of the passive reflector 50 is disposed between the main antenna 30 and the tag assembly 60, and the other part is disposed on the side of the tag assembly 60 away from the main antenna 30; or, the passive reflector 50 is entirely disposed between the main antenna 30 and the tag assembly 60.

[0061] The beneficial effects of this embodiment are as follows: The antenna positioning device 100 provided by the embodiment of the present application disposes the passive reflector 50 between the main antenna 30 and the tag assembly 60. Compared with the case where the passive reflector 50 is disposed on the side of the tag assembly 60 away from the main antenna 30, the sum of the distance between the passive reflector 50 and the main antenna 30 and the distance between the passive reflector 50 and the tag assembly 60 is smaller. The sum of the transmission distance of the third beam 83 emitted by the tag assembly 60 and the propagation distance of the reflected fourth beam 84 is smaller, and the signals received by the main antenna and the sub-antennas 40 are stronger and easier to identify.

[0062] In some embodiments, please refer toFigure 1 and Figure 2 The normal direction X of the passive reflector 50 is perpendicular to the spacing direction Y between the main antenna 30 and the tag assembly 60.

[0063] It can be understood that the main antenna 30 and the tag assembly 60 are respectively located on both sides of the normal of the passive reflector 50. Optionally, the normal of the passive reflector 50 is set horizontally, and the main antenna 30 emits a vertical first beam 81 towards the tag assembly 60.

[0064] The beneficial effect of this embodiment is that: in the antenna positioning device 100 provided by the embodiment of the present application, since the normal direction X of the passive reflector 50 is perpendicular to the spacing direction Y between the main antenna 30 and the tag assembly 60, the fourth beam 84 reflected by the passive reflector 50 between the main antenna 30 and the tag assembly 60 is transmitted along the spacing direction Y between the main antenna 30 and the tag assembly 60 towards the direction close to the main antenna 30, and the fourth beam 84 is more easily received by the main antenna 30.

[0065] In some embodiments, please refer to Figure 1 and Figure 2 the antenna positioning device 100 includes a plurality of passive reflectors 50.

[0066] Optionally, the plurality of passive reflectors 50 can be arranged around the main antenna 30 along the spacing direction Y between the main antenna 30 and the electronic tag, or a part of the passive reflectors 50 can be arranged within the projection of the main antenna 30 in the area of the tag assembly 60 along the spacing direction Y from the tag assembly 60.

[0067] Optionally, the normal direction X of the plurality of passive reflectors 50 is perpendicular to the spacing direction Y between the main antenna 30 and the tag assembly 60.

[0068] The plurality of passive reflectors 50 can be numbered respectively. The reader 10 can judge the number of the passive reflector 50 that reflects the fourth beam 84 according to the reflection modulation situation of the fourth beam 84, and calculate the spatial position of the electronic tag according to the installation position of the specific passive reflector 50. Optionally, the number of the passive reflector 50 is judged according to the angle of the fourth beam 84 incident on the main antenna 30, and the passive reflectors 50 at different positions can reflect the fourth beam 84 in different directions.

[0069] The beneficial effect of this embodiment is that: the antenna positioning device 100 provided by the embodiment of the present application can receive the third beam 83 of the same electronic tag at multiple positions through the plurality of passive reflectors 50 and reflect the fourth beam 84, increasing the spatial positions obtained by the reader 10 when positioning the same electronic tag, and making the final fused spatial position more accurate.

[0070] In some embodiments, the distance between the passive reflector 50 and the main antenna 30 is d2, and the value range of d2 is: 8λ ≤ d2 ≤ 10λ, where λ is the wavelength of the antenna positioning device 100.

[0071] Optionally, d1 is 8λ, 8.5λ or 9λ.

[0072] The beneficial effect of this embodiment is that the antenna positioning device 100 provided by the embodiment of the present application can easily achieve beam focusing by the main antenna 30 emitting a near-field beam, improving the positioning accuracy. Limiting the distance between the passive reflector 50 and the main antenna 30 within the above range can reflect and collect weak signals that are far from the main antenna 30, and can effectively reflect the third beam 83 within the near-field range, ensuring the signal strength received by the main antenna 30.

[0073] In some embodiments, please refer to Figure 2 , the tag component 60 is arranged on one side of the main antenna 30 along the first direction, and the sub-antenna 40 is arranged on one side of the main antenna 30 along the direction perpendicular to the first direction.

[0074] It can be understood that the first direction is the interval direction Y between the main antenna 30 and the tag component 60.

[0075] It can be understood that there are multiple directions perpendicular to the first direction, and the sub-antenna 40 can be arranged on one side of the main antenna 30 along any direction perpendicular to the first direction. Different sub-antennas 40 can be respectively arranged on one side of the main antenna 30 along different directions perpendicular to the first direction, that is, multiple sub-antennas 40 can be arranged around the first direction. Optionally, two sub-antennas 40 are provided and are symmetrically arranged with respect to the main antenna 30.

[0076] The beneficial effect of this embodiment is that the antenna positioning device 100 provided by the embodiment of the present application makes each sub-antenna 40 have a relatively short distance from the edge of the first beam 81 by arranging the sub-antenna 40 on one side of the main antenna 30 along the first direction, making the overall of the main antenna 30 and the sub-antenna 40 more concentrated.

[0077] In some embodiments, please refer to Figure 1 and Figure 2 , the antenna positioning device 100 includes a beamforming device 20, and the beamforming device 20 is electrically connected to each of the reader 10, the main antenna 30 and the sub-antenna 40. The beamforming device 20 can control the main antenna 30 and the sub-antenna 40 to emit the first beam 81 and the second beam 82 respectively according to the control signal.

[0078] It can be understood that the input end of the beamforming device 20 is connected to the reader 10, and the output end of the beamforming device 20 is connected to the main antenna 30 and the sub-antenna 40. The beamforming device 20 processes the control signal of the reader 10 and then transmits it to the main antenna 30 and the sub-antenna 40, so that the main antenna 30 and the sub-antenna 40 emit a focused beam with a specific shape for scanning. Optionally, the beamforming device 20 is integrated with the reader 10.

[0079] The beneficial effect of this embodiment is that the antenna positioning device 100 provided by the embodiment of the present application uses the beamforming device 20 to control the main antenna 30 and the sub-antenna 40, which can enable the first beam 81 and the second beam 82 to be directionally transmitted and has a better focusing effect.

[0080] In some embodiments, the passive reflector 50 includes an intelligent reflector.

[0081] The beneficial effect of this embodiment is that compared with the traditional passive reflector 50, the antenna positioning device 100 provided by the embodiment of the present application can enhance the signal intensity of the reflected fourth beam 84 through the intelligent reflector.

[0082] In other embodiments, the passive reflector 50 further includes a plane mirror or a metal reflector plate.

[0083] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An antenna positioning device, characterized in that: include: A reader / writer, used to transmit control signals; A main antenna, electrically connected to the reader / writer, and configured to transmit a first beam according to the control signal; A tag component, the tag component is used to receive the first beam and emit a third beam; a passive reflecting surface, the passive reflecting surface being used to receive the third beam and reflect a fourth beam; The main antenna is also used to receive the third beam and the fourth beam and transmit them to the reader.

2. The antenna positioning device according to claim 1, characterized in that: The antenna positioning device also includes a sub-antenna electrically connected to the reader / writer, and the sub-antenna is used to transmit a second beam according to the control signal; the tag component is also used to receive the second beam and emit the third beam; the sub-antenna is also used to receive the third beam and the fourth beam and transmit them to the reader / writer.

3. The antenna positioning device according to claim 2, characterized in that: The distance between the main antenna and the secondary antenna is d1, and the value range of d1 is: 2λ≤d1≤3λ, where λ is the wavelength of the antenna positioning device.

4. The antenna positioning device according to claim 2, characterized in that: The antenna positioning device includes a plurality of the secondary antennas, and the plurality of the secondary antennas are arranged around the main antenna to increase the coverage area of ​​the second beam.

5. The antenna positioning device according to claim 1, characterized in that: The main antenna and the tag component are spaced apart, and at least a portion of the passive reflective surface is disposed between the main antenna and the tag component.

6. The antenna positioning device according to claim 1, characterized in that: The normal direction of the passive reflection surface is perpendicular to the spacing direction between the main antenna and the tag assembly; and / or, the antenna positioning device includes a plurality of the passive reflection surfaces.

7. The antenna positioning device according to claim 5, characterized in that: The distance between the passive reflection surface and the main antenna is d2, and the value range of d2 is: 8λ≤d2≤10λ, where λ is the wavelength of the antenna positioning device.

8. The antenna positioning device according to any one of claims 2 to 4, characterized in that: The tag component is arranged on one side of the main antenna along a first direction, and the secondary antenna is arranged on one side of the main antenna along a direction perpendicular to the first direction.

9. The antenna positioning device according to any one of claims 2 to 4, characterized in that: The antenna positioning device includes a beamforming device, which is electrically connected to the reader / writer, the main antenna and each of the secondary antenna. The beamforming device is used to control the main antenna and the secondary antenna to transmit the first beam and the second beam respectively according to the control signal.

10. The antenna positioning device according to any one of claims 1 to 7, characterized in that: The passive reflective surface includes a smart reflective surface.

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