CN106845607B - Narrow wave beam RFID circular polarization antenna system - Google Patents
Narrow wave beam RFID circular polarization antenna system Download PDFInfo
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- CN106845607B CN106845607B CN201611255786.7A CN201611255786A CN106845607B CN 106845607 B CN106845607 B CN 106845607B CN 201611255786 A CN201611255786 A CN 201611255786A CN 106845607 B CN106845607 B CN 106845607B
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- 230000010287 polarization Effects 0.000 title description 3
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 239000004809 Teflon Substances 0.000 claims description 7
- 229920006362 Teflon® Polymers 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 210000001956 EPC Anatomy 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention relates to a narrow-beam RFID circularly polarized antenna system, and belongs to the technical field of radio frequency identification technology and antenna technology. The antenna system comprises two receiving and transmitting antenna array elements, an angle-adjustable antenna bracket, a reader and a logic control alarm circuit. The antenna system controls the practical beam by utilizing the logical relation between the beams of the two antenna array elements, the reader polls the two receiving and transmitting antenna array elements and uploads the information of the read tag to the logic control alarm circuit, the logic control alarm circuit carries out logic judgment on the acquired information, and only the tag is considered to be effective when the tag is judged to be from two ports of the reader, namely the intersection of the radiation beams of the two antenna array elements is the practical beam, and the practical beam of the antenna system is controlled by adjusting the radiation angles of the two antenna array elements. The method is very suitable for the RFID access control system, can regulate and control the practical wave beam of the RFID antenna system, enhances the accuracy of tag identification, and reduces the misjudgment of the RFID access control system.
Description
Technical Field
The invention belongs to the technical field of radio frequency identification technology and antennas, and particularly relates to an antenna system for RFID narrow beam control.
Background
RFID technology has been used for various tracking and identification purposes, such as inventory control, merchandise tracking, security access, and inventory checking. In the practical application of RFID, different application scenarios have specific requirements for the identification area. Reader antennas are an important component of RFID systems, which are of great importance for the development and application of RFID.
An anti-theft gate inhibition system is a typical application of the RFID technology, however, the application of the gate inhibition system faces serious problems: if an article does not enter the practical alarm area, the article is misread and alarms, for example, when a store is provided with a goods shelf near an exit, an RFID tag on the article can be read by an antenna of an access control system to be misjudged. In order to eliminate the misjudgment phenomenon, a narrow-beam access control antenna is required to be provided, the traditional method is to compress beams by adopting an antenna array, the more the number of antenna array elements is, the narrower the beams are, but the antenna designed by the scheme often has a complicated feed network, a larger antenna size and high cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a narrow-beam RFID circularly polarized antenna system, which can reduce the beam of the antenna system, has controllable beam width, and can reduce the size, complexity and cost of the antenna. For this purpose, the invention is implemented by the following technical scheme:
the narrow wave beam RFID circularly polarized antenna system is characterized in that: the antenna comprises two or more than three receiving and transmitting antenna array elements, an antenna bracket capable of adjusting the angles of the receiving and transmitting antenna array elements, a reader and a logic control alarm circuit;
the included angles between the array elements of different receiving and transmitting antennas and the ground are different, the intersection of the beams of the array elements of the different receiving and transmitting antennas is a practical beam, different output ports of the reader are connected with the array elements of the different receiving and transmitting antennas, and the reader is connected with the logic control alarm circuit; the reader polls different receiving and transmitting antenna array elements and uploads information of the read tag to the logic control alarm circuit, the logic control alarm circuit carries out logic judgment on the acquired tag information, and the tag is considered to be read effectively only when the same tag information is judged to be from different ports of the reader.
Further, the antenna system is provided with two receiving and transmitting antenna elements, and the reader is provided with two ports which are respectively connected with the first receiving and transmitting antenna element and the second receiving and transmitting antenna element.
Further, the transceiver antenna array element comprises two radiation patches, a teflon filling plate and a feed network, wherein the radiation patches and the feed network are arranged on an insulating material and then connected to the teflon filling plate. The use of teflon filler plates instead of conventional air filling can reduce the cross section and size of the antenna elements.
Further, the two radiation patches are identical, and the distance is half of the working wavelength of the electromagnetic wave transmitted in the medium.
Further, the feed network is combined by a Wilkinson power divider and a 3dB bridge to generate a constant amplitude orthogonal signal, which is connected to the radiating patch to generate a circularly polarized radiation characteristic.
The invention has the following advantages: the antenna has the advantages of being simple in structure, combining the wave beam control technology of the antenna and the RFID technology, not only realizing the characteristic of the narrow wave beam RFID antenna with controllable wave beams, but also enhancing the accuracy of tag identification and reducing the misjudgment of an RFID system, and being an RFID tag-based access control system with simple structure.
Drawings
FIG. 1 is a schematic view of the structural principles of the present invention;
fig. 2a is a front view of an antenna element structure according to the invention;
fig. 2b is a side view of the antenna element structure of the present invention;
FIG. 3 is a schematic view of the orientation of two antenna elements and an antenna support of the present invention;
FIG. 4 is a circuit block diagram of the present invention;
FIG. 5 is a logic control flow diagram of the present invention;
fig. 6a is a schematic diagram of a beam area (alarm area) when the first antenna element forms an angle θ=0° with respect to the ground.
Fig. 6b is a schematic diagram of a beam area (alarm area) when the first antenna element forms an angle θ=15° with respect to the ground.
Fig. 6c is a schematic diagram of a beam area (alarm area) when the first antenna element forms an angle θ=30° with respect to the ground.
FIG. 7 is a schematic diagram of a system performance test scheme according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawings: the present embodiment is carried out on the basis of the present invention, and specific embodiments are given, but the scope of the present invention is not limited to the following embodiments.
Reference is made to the accompanying drawings. The narrow-beam RFID circularly polarized antenna system comprises two receiving and transmitting antenna array elements 101 and 102, an antenna bracket 103 capable of adjusting the angles of the receiving and transmitting antenna array elements, a reader and a logic control alarm circuit;
the included angles between the array elements of different receiving and transmitting antennas and the ground are different, namely the radiation angles of the array elements of the antennas are different, the intersection of the beams of the array elements of the different receiving and transmitting antennas is a practical beam, different output ports of the reader are connected with the array elements of the different receiving and transmitting antennas, and the reader is connected with the logic control alarm circuit;
different structures can be adopted in the implementation mode of the antenna support 103, so long as the angle of the antenna array element can be adjusted, the included angle between different antenna array elements and the ground is different, different antenna array elements can be formed by different antenna supports, and each antenna support can be integrated on one mounting support. As shown in fig. 3, it includes a general mounting bracket 1030, and each antenna bracket 103 is fixed to the mounting bracket 1030, and the antenna brackets 103 are provided with hinges and positioning structures to adjust the antenna angle and fix the antenna.
The reader can be developed based on an M6e read-write module of Thingmagic, and is provided with 4 antenna output ports, the output power is adjustable by 5-31.5dBm, and the receiving sensitivity reaches-75 dBm. Two connection ports of the reader, namely a port 1 and a port 2, are arranged and can be respectively connected with a first transceiver antenna array element and a second transceiver antenna array element.
The logic control alarm circuit can adopt a conventional MCU control module and is connected with the alarm module and the power supply module, and the logic control flow is shown in figure 5.
The transceiver antenna array element comprises two radiation patches 106, a teflon filling plate 107 and a feed network 105, wherein the radiation patches 106 and the feed network 105 are arranged on an insulating material 108 and then connected to the teflon filling plate 107. The two radiation patches are identical, and the distance is half of the working wavelength of electromagnetic wave transmission in the medium.
The rf signal of the reader is connected via a feed line 104 to the feed point a of the feed network 105 of the antenna array element. In the feed network 105, two output ends of the Wilkinson power divider are respectively connected to an input end of a 3dB bridge, another port of the 3dB bridge is connected to ground through a 50Ω load resistor, and two output ports of the 3dB bridge provide equal-amplitude orthogonal signal excitation radiation patches to generate circular polarization characteristics.
A schematic diagram of an embodiment of the present invention is shown in fig. 2. The port 1 and the port 2 of the reader are connected with feed network feed points of the transceiver antenna array elements 101 and 102 through feed lines, respectively poll and control the transceiver antenna array element 101 and the transceiver antenna array element 102, and upload the information read by the tag 200 to a logic control alarm circuit, when the tag only falls in the identification area 1010 of the transceiver antenna array element 101 or the identification area 1020 of the transceiver antenna array element 102, the logic control alarm circuit only receives the tag information uploaded by the port 1 or the port 2 of the reader, and the logic control alarm circuit does not respond to the alarm. When the tag information is uploaded by both the reader port 1 and the reader port 2 (both fall into the identification area 1010 and the identification area 1020, and the intersection of the two areas is the alarm area 1000), the logic control alarm circuit compares EPCs of the tags received by the two ports, and only when the EPC data of the tags received by the two ports are judged to be the same, the logic control alarm circuit sends an alarm command.
The radiation beam direction of each antenna element can be adjusted by adjusting the antenna support 103 as required, so that the intersection area of the radiation beams of the two antenna elements is changed, i.e. the practical beam of the antenna system is adjustable.
In order to prove the practical effect of the invention, as shown in fig. 7, a plane 1.8m below the antenna system is selected as an experimental surface, a clothing tag is selected as an experimental tag, the tag is moved on the experimental surface by changing the included angle theta between the antenna array element and the ground, and the practical beam area of the antenna system is verified by drawing an alarm area. Fig. 4 shows the alarm area of the antenna system when θ=0°, θ=15°, θ=30°, and it can be seen that as θ increases, the practical beam of the antenna system narrows, and the alarm area 1000 becomes smaller, so that the size and position of the alarm area can be changed according to the adjustment of the antenna angle, and the special requirement of the mall on entrance guard theft prevention is satisfied.
The above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (4)
1. The narrow wave beam RFID circularly polarized antenna system is characterized in that: the antenna comprises two receiving and transmitting antenna array elements, an antenna bracket capable of adjusting the angles of the receiving and transmitting antenna array elements, a reader and a logic control alarm circuit; the included angles between the array elements of different receiving and transmitting antennas and the ground are different, the intersection of the beams of the array elements of the different receiving and transmitting antennas is a practical beam, different output ports of the reader are connected with the array elements of the different receiving and transmitting antennas, and the reader is connected with the logic control alarm circuit; the reader polls different receiving and transmitting antenna array elements and uploads information of the read tag to the logic control alarm circuit, the logic control alarm circuit carries out logic judgment on the acquired tag information, and only when the same tag information is judged to be from different ports of the reader, the tag is considered to be read effectively; the antenna system is provided with two receiving and transmitting antenna array elements, the reader is provided with two ports, and the two ports are respectively connected with the first receiving and transmitting antenna array element and the second receiving and transmitting antenna array element; the output power of the port of the reader is 5-31.5dBm, the output power is adjustable within the range of 5-31.5dBm, and the receiving sensitivity of the port of the reader reaches-75 dBm; the antenna comprises a total mounting bracket, wherein the first transceiver antenna array element and the second transceiver antenna array element are fixed on the mounting bracket through corresponding antenna brackets, and the antenna brackets are provided with hinges and positioning structures to adjust the angle of the antenna and fix the antenna; according to the adjustment of the angle of the antenna, the size and the position of the alarm area are changed, and the requirement of the entrance guard is met.
2. The narrow beam RFID circularly polarized antenna system of claim 1, wherein: the receiving and transmitting antenna array element comprises two radiation patches, a Teflon filling plate and a feed network, wherein the radiation patches and the feed network are arranged on an insulating material and then connected to the Teflon filling plate.
3. The narrow beam RFID circularly polarized antenna system of claim 2, wherein: the two radiation patches are identical, and the distance is half of the working wavelength of electromagnetic wave transmission in the medium.
4. The narrow beam RFID circularly polarized antenna system of claim 2, wherein: the feed network is combined by a Wilkinson power divider and a 3dB bridge to generate constant amplitude orthogonal signals, which are connected to the radiating patches to generate circularly polarized radiation characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611255786.7A CN106845607B (en) | 2016-12-30 | 2016-12-30 | Narrow wave beam RFID circular polarization antenna system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611255786.7A CN106845607B (en) | 2016-12-30 | 2016-12-30 | Narrow wave beam RFID circular polarization antenna system |
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| Publication Number | Publication Date |
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| CN106845607A CN106845607A (en) | 2017-06-13 |
| CN106845607B true CN106845607B (en) | 2023-12-08 |
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| CN201611255786.7A Active CN106845607B (en) | 2016-12-30 | 2016-12-30 | Narrow wave beam RFID circular polarization antenna system |
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Families Citing this family (1)
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| CN111860712B (en) * | 2020-07-06 | 2021-04-30 | 深圳市亿云联科技有限公司 | RFID access door based on narrow beam antenna and working method thereof |
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| CN106845607A (en) | 2017-06-13 |
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