WO2020103335A1 - Ultra-high frequency radio frequency identification microstrip and ultra-high frequency radio frequency identification reader and writer - Google Patents

Ultra-high frequency radio frequency identification microstrip and ultra-high frequency radio frequency identification reader and writer

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Publication number
WO2020103335A1
WO2020103335A1 PCT/CN2019/073282 CN2019073282W WO2020103335A1 WO 2020103335 A1 WO2020103335 A1 WO 2020103335A1 CN 2019073282 W CN2019073282 W CN 2019073282W WO 2020103335 A1 WO2020103335 A1 WO 2020103335A1
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WIPO (PCT)
Prior art keywords
radio frequency
frequency identification
microstrip line
uhf radio
microstrip
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PCT/CN2019/073282
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French (fr)
Chinese (zh)
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颜力
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南京思追特电子科技有限公司
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Publication of WO2020103335A1 publication Critical patent/WO2020103335A1/en

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    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
    • 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
    • H01Q1/2216—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 interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors

Definitions

  • the invention relates to the field of signal transmission, in particular to a UHF radio frequency identification microstrip line and an UHF radio frequency identification reader.
  • UHF RFID technology With the improvement of chip performance and the reduction of chip prices, the development and application of UHF RFID technology has entered the fast lane since 2015. More and more actual projects use UHF radio frequency identification technology to identify items or people, thereby helping to complete the management work such as inventory, search, traceability, timing, and charging.
  • UHF RFID technology performance is not ideal, the label is either missed or misread, it is always difficult to obtain a satisfactory recognition rate.
  • the repeated reflection and refraction of the electromagnetic field in the surrounding environment, the influence of the liquid and metal on the matching performance of the tag antenna, and the fading law of the field in the far field of the electromagnetic field radiation have caused the randomness of the electromagnetic field strength and blind areas in the entire reading area Sex, uncertainty, and perturbability. This leads to problems of missed reading and misreading.
  • Most near-field antenna structures can be regarded as a combination of several radiating elements, which are still essentially standing wave antennas. As long as it is a standing wave antenna, there are inevitably strong and blind areas in the antenna field area.
  • the near-field antenna structure currently proposed in the market or in the literature is relatively complex, difficult to process, and the cost remains high, which affects the further promotion and application of the radio frequency identification system.
  • the present invention provides an ultra-high frequency radio frequency identification microstrip line, which is easy to process and controllable in cost, and has a simple feed point and a frequency loan of more than 100 trillion.
  • the present invention provides a UHF radio frequency identification microstrip line
  • the UHF radio frequency identification microstrip line includes a dielectric substrate, a conductor formed on a surface of the dielectric substrate, formed in the The metal ground on the other surface of the dielectric substrate, the conductor includes a meandering part, a pair of connecting parts located at both ends of the meandering part and integrally formed with the meandering part, one of the connecting parts is connected to a matching load, Another connection part connects the feed point.
  • the number of the UHF radio frequency identification microstrip lines is several, the several UHF radio frequency identification microstrip lines are connected in series by a cable, and are located at the connection parts at the first and last ends, one of which is connected To match the load, another connection part is connected to the feed point.
  • the number of the UHF radio frequency identification microstrip lines is several, the several UHF radio frequency identification microstrip lines are connected in series by a cable, and are located at the connection parts at the first and last ends, one of which is connected To match the load, another connection part is connected to the feed point.
  • connection part is connected to a radio frequency connector matching a load, a feed point or another UHF radio frequency identification microstrip line through a radio frequency connector.
  • the metal ground of the UHF radio frequency identification microstrip line extends around the conductor, and the metal ground extending around the conductor is located on the same surface as the conductor.
  • grounding portion surrounding the conductor has two slots, and the connecting portion passes through the slot and is connected to the radio frequency connector.
  • the strong magnetic field of the micro-strip line of the UHF radio frequency identification is evenly distributed.
  • the cable is a coaxial cable.
  • the UHF radio frequency identification microstrip line is at most 10 meters.
  • the present invention also provides a UHF RFID microstrip line connection for identifying, reading or writing near field RFID electronic tags located in the area above the UHF RFID microstrip line .
  • the ultra-high frequency radio frequency identification microstrip line in the present invention is easy to process, the cost is controllable, and the feed point is simple, and the frequency loan can reach more than one trillion.
  • the meander line structure of the UHF RFID microstrip line uses the spatial coupling of the current of the adjacent microstrip lines and the discontinuity at the bend to form a strong magnetic field near the UHF RFID microstrip line. Connect a matching load to the end of the UHF RFID microstrip line, so that the strong magnetic field of the UHF RFID microstrip line is evenly distributed.
  • the length of the UHF RFID microstrip line is adjustable, easy to use, users can choose the appropriate UHF RFID microstrip line with a meandering period according to their needs, or connect different numbers of UHF RFID in series as needed Microstrip line.
  • the length of the UHF RFID microstrip line can be adjusted from several meters to tens of meters.
  • the microstrip line of the UHF radio frequency identification in the present invention has quite excellent radio frequency reading performance, successfully restrains the electromagnetic near field directly above it, and completely solves the problems of missed reading and misreading of the UHF radio frequency identification.
  • this UHF radio frequency identification microstrip line has wide frequency band adaptability, wide temperature adaptability, wide processing tolerance, and wide dielectric constant adaptability.
  • the metal ground plane can also process printed circuits, directly integrating the RF front end and the UHF radio frequency identification microstrip line, which is an excellent structure with extensive practical value.
  • FIG. 1 is a schematic structural view of a metal plate placed above the microstrip line of the UHF radio frequency identification of the present invention.
  • FIG. 2 is a schematic diagram of the structure of a microstrip line for UHF radio frequency identification.
  • the UHF radio frequency identification microstrip line in the present invention is given.
  • the UHF radio frequency identification microstrip line is processed by PCB (Printed Circuit Board) technology, and the UHF radio frequency identification
  • the microstrip line includes a dielectric substrate 1, a conductor 2 formed on the upper surface of the dielectric substrate 1, a metallic ground 3 formed on the lower surface of the dielectric substrate, the metallic ground surrounding the conductor and extending to the dielectric On the other surface of the substrate 1, the metal ground extending around the conductor is on the same surface as the conductor.
  • the UHF radio frequency identification microstrip line may not have a metal ground surrounding the conductor, but only a metal ground located on the opposite surface of the dielectric substrate and the conductor 2.
  • the conductor 2 includes a meandering portion 21, a pair of connecting portions 22, 23 located at both ends of the meandering portion 21 and integrally formed with the meandering portion 21, one of the connecting portions 22 is connected to a matching load, and the other is connected Section 23 connects the feed points.
  • the number of meanders can be adjusted according to actual needs.
  • the length of the conductor 2 can be adjusted freely, the period of the meander line can be selected according to the need, or several UHF radio frequency identification microstrip lines can be connected through a coaxial cable, and the coaxial cables are respectively connected to two adjacent The connection part of a UHF radio frequency identification microstrip line.
  • the coaxial cable connects several UHF RFID microstrip lines in series, and then connects the connection end of one of the UHF RFID microstrip lines at both ends to the load and the other to the feed point.
  • connection parts 22 and 23 are connected to two radio frequency connectors 5, one of which is connected to the feed point, and the other is connected to the radio frequency connector of the ultra-high frequency radio frequency identification microstrip line connected thereto or a matched load.
  • the metal ground 3 surrounding the conductor 2 has two slots 31 through which the connecting portions 22 and 23 pass and are connected to the radio frequency connector 5.
  • the ultra-high frequency radio frequency identification microstrip line in the present invention is easy to process, the cost is controllable, and the feed point is simple, and the frequency loan can reach more than 100 trillion.
  • the meander line structure of the UHF RFID microstrip line uses the spatial coupling of the current of the adjacent microstrip lines and the discontinuity at the bend to form a strong magnetic field near the UHF RFID microstrip line. Connect the matching load to the end of the UHF RFID microstrip line, so that the strong magnetic field of the UHF RFID microstrip line is evenly distributed, that is, the same point may be a peak or a trough at different times. As shown in FIG. 1, the uppermost rectangular metal plate 4 has little effect on the performance of the UHF radio frequency identification microstrip line, and further reflects the near-field characteristics of the UHF radio frequency identification microstrip line.
  • the length of the UHF radio frequency identification microstrip line is adjustable, easy to use, users can choose the appropriate UHF radio frequency identification microstrip line with a meandering period, or connect different numbers of UHF in series Radio frequency identification microstrip line.
  • the length of the UHF radio frequency identification microstrip line can be adjusted from several meters to several tens of meters, and the meandering period of the meandering part 21 can be extended to many as long as the radio frequency loss of the propagation structure or the dielectric substrate is small enough.
  • UHF radio frequency identification microstrip lines can also be cascaded with each other, thereby forming a longer or irregular UHF radio frequency identification microstrip line.
  • the UHF radio frequency identification microstrip line is connected to the UHF radio frequency identification reader, and is used to identify, read or write the near field radio frequency identification electronic tag located in the area above the UHF radio frequency identification microstrip line.
  • the microstrip line of the UHF radio frequency identification in the present invention has quite excellent radio frequency reading performance, successfully restrains the electromagnetic near field directly above it, and completely solves the problems of missed reading and misreading of the UHF radio frequency identification.
  • this UHF radio frequency identification microstrip line has wide frequency band adaptability, wide temperature adaptability, wide processing tolerance, and wide dielectric constant adaptability.
  • the metal ground plane can also process printed circuits, directly integrating the RF front end and the UHF radio frequency identification microstrip line, which is an excellent structure with extensive practical value.

Abstract

An ultra-high frequency radio frequency identification microstrip comprises a medium substrate (1); a conductor (2) formed on a surface of the medium substrate (1); and a metal ground (3) formed on another surface of the medium substrate (1). The conductor (2) comprises a meandering portion (21), and a pair of connection portions (22, 23) located at two ends of the meandering portion (21) and integrally formed therewith, wherein one connection portion (22) is connected to a matched load, and the other connection portion (23) is connected to a feed point. The ultra-high frequency radio frequency identification microstrip has a meandering structure employing spatial coupling of currents in adjacent microstrips and the discontinuity of bent portions, so as to form a strong magnetic field at a position close to and above the ultra-high frequency radio frequency identification microstrip. The length of the ultra-high frequency radio frequency identification microstrip is adjustable and easy to use. A user can select, according to actual requirements, an ultra-high frequency radio frequency identification microstrip having an appropriate meandering period, or connect a random number of ultra-high frequency radio frequency identification microstrips in series according to actual requirements.

Description

超高频射频识别的微带线及超高频射频识别读写器UHF radio frequency identification microstrip line and UHF radio frequency identification reader 【技术领域】【Technical Field】
本发明涉及信号传输领域，具体为一种超高频射频识别的微带线及超高频射频识别读写器。The invention relates to the field of signal transmission, in particular to a UHF radio frequency identification microstrip line and an UHF radio frequency identification reader.
【背景技术】【Background technique】
随着芯片性能的提升和芯片价格的降低，从2015年开始超高频射频识别技术的发展和应用进入快车道。越来越多的实际项目中使用超高频射频识别技术来识别物品或人员，从而帮助完成盘点、查找、追溯、计时、收费等管理工作。然而，在实际使用中，超高频射频识别技术表现并不理想，标签要么漏读、要么误读，总是难以获得令人满意的识别率。因为周围环境对电磁场的反复反射和折射、液体和金属对标签天线匹配性能的影响、以及电磁场辐射远场中场的衰落规律等因素综合起来造成了整个识读区域内外电磁场强区和盲区的随机性、不确定性、和易扰动性。从而导致漏读和误读问题。With the improvement of chip performance and the reduction of chip prices, the development and application of UHF RFID technology has entered the fast lane since 2015. More and more actual projects use UHF radio frequency identification technology to identify items or people, thereby helping to complete the management work such as inventory, search, traceability, timing, and charging. However, in actual use, UHF RFID technology performance is not ideal, the label is either missed or misread, it is always difficult to obtain a satisfactory recognition rate. The repeated reflection and refraction of the electromagnetic field in the surrounding environment, the influence of the liquid and metal on the matching performance of the tag antenna, and the fading law of the field in the far field of the electromagnetic field radiation have caused the randomness of the electromagnetic field strength and blind areas in the entire reading area Sex, uncertainty, and perturbability. This leads to problems of missed reading and misreading.
为避免周围环境对电磁场的反复反射和折射，适应从物品的大包装射频识别标签、托盘射频识别标签向着单品级射频识别标签迈进的趋势，越来越多的用于超高频射频识别读写器的近场天线结构被提出。这些天线各具特点，但也存在一定的不足，主要表现在：In order to avoid the repeated reflection and refraction of the electromagnetic field in the surrounding environment, it is adapted to the trend of moving from large-package RFID tags and pallet RFID tags to item-level RFID tags. More and more are used for UHF RFID reading The near-field antenna structure of the writer is proposed. These antennas have their own characteristics, but they also have certain deficiencies, mainly manifested in:
1.大多数近场天线结构可以被看作是若干个辐射单元的组合，本质上仍然是驻波式天线。只要是驻波天线，天线场区就不可避免地存在强区和盲区。1. Most near-field antenna structures can be regarded as a combination of several radiating elements, which are still essentially standing wave antennas. As long as it is a standing wave antenna, there are inevitably strong and blind areas in the antenna field area.
2.目前市场上或者文献中提出的近场天线结构较为复杂，难以加工，成本居高不下，影响了射频识别系统的进一步推广应用。2. The near-field antenna structure currently proposed in the market or in the literature is relatively complex, difficult to process, and the cost remains high, which affects the further promotion and application of the radio frequency identification system.
3.目前市场上或者文献中提出的近场天线都是精心设计调试的成果。它们往往对生产的加工精度、材料的温度特性等要求很高。这也影响了量产的成品率和产品的应用范围。3. The near field antennas currently proposed in the market or in the literature are the result of careful design and debugging. They often have high requirements on the processing accuracy and temperature characteristics of materials. This also affects the yield of mass production and the scope of product applications.
由此可见，提供一种超高频射频识别的微带线及超高频射频识别读写器是本领域亟需解决的问题。It can be seen that providing a UHF radio frequency identification microstrip line and an UHF radio frequency identification reader is an urgent problem to be solved in the art.
【发明内容】[Invention content]
本发明针对上述问题，提供超高频射频识别的微带线，易于加工，成本可 控，而且馈点简单、频率贷款可以达到百兆以上。In view of the above problems, the present invention provides an ultra-high frequency radio frequency identification microstrip line, which is easy to process and controllable in cost, and has a simple feed point and a frequency loan of more than 100 trillion.
为了解决上述问题，本发明提供的一种超高频射频识别的微带线，所述超高频射频识别的微带线包括介质基材、形成于介质基材一表面的导体、形成于所述介质基材另一表面的金属地，所述导体包括蜿蜒部、位于所述蜿蜒部两端并与所述蜿蜒部一体成型的一对连接部，其中一个连接部连接匹配负载，另一个连接部连接馈点。In order to solve the above problems, the present invention provides a UHF radio frequency identification microstrip line, the UHF radio frequency identification microstrip line includes a dielectric substrate, a conductor formed on a surface of the dielectric substrate, formed in the The metal ground on the other surface of the dielectric substrate, the conductor includes a meandering part, a pair of connecting parts located at both ends of the meandering part and integrally formed with the meandering part, one of the connecting parts is connected to a matching load, Another connection part connects the feed point.
进一步的，所述超高频射频识别的微带线数量具有若干个，所述若干个超高频射频识别的微带线通过线缆串联，位于首末两端的连接部，其中一个连接部连接匹配负载，另一个连接部连接馈点。Further, the number of the UHF radio frequency identification microstrip lines is several, the several UHF radio frequency identification microstrip lines are connected in series by a cable, and are located at the connection parts at the first and last ends, one of which is connected To match the load, another connection part is connected to the feed point.
进一步的，所述超高频射频识别的微带线数量具有若干个，所述若干个超高频射频识别的微带线通过线缆串联，位于首末两端的连接部，其中一个连接部连接匹配负载，另一个连接部连接馈点。Further, the number of the UHF radio frequency identification microstrip lines is several, the several UHF radio frequency identification microstrip lines are connected in series by a cable, and are located at the connection parts at the first and last ends, one of which is connected To match the load, another connection part is connected to the feed point.
进一步的，所述连接部通过射频连接器连接接匹配负载、馈点或者另一个超高频射频识别的微带线的射频连接器。Further, the connection part is connected to a radio frequency connector matching a load, a feed point or another UHF radio frequency identification microstrip line through a radio frequency connector.
进一步的，所述超高频射频识别的微带线的金属地延伸至所述导体四周，延伸至所述导体四周的金属地与所述导体位于同一表面。Further, the metal ground of the UHF radio frequency identification microstrip line extends around the conductor, and the metal ground extending around the conductor is located on the same surface as the conductor.
进一步的，所述围绕在导体四周的接地部具有两个开槽，所述连接部穿过所述开槽并与所述射频连接器连接。Further, the grounding portion surrounding the conductor has two slots, and the connecting portion passes through the slot and is connected to the radio frequency connector.
进一步的，所述超高频射频识别的微带线的强磁场均匀分布。Further, the strong magnetic field of the micro-strip line of the UHF radio frequency identification is evenly distributed.
进一步的，所述线缆为同轴电缆。Further, the cable is a coaxial cable.
进一步的，所述超高频射频识别的微带线至多为10米。Further, the UHF radio frequency identification microstrip line is at most 10 meters.
为了解决上述问题，本发明还提供一种超高频射频识别的微带线连接，用于识别、读取或写入位于超高频射频识别的微带线上方区域的近场射频识别电子标签。In order to solve the above problems, the present invention also provides a UHF RFID microstrip line connection for identifying, reading or writing near field RFID electronic tags located in the area above the UHF RFID microstrip line .
再者，本发明中的超高频射频识别的微带线易于加工，成本可控，而且馈点简单、频率贷款可以达到百兆以上。Furthermore, the ultra-high frequency radio frequency identification microstrip line in the present invention is easy to process, the cost is controllable, and the feed point is simple, and the frequency loan can reach more than one trillion.
超高频射频识别的微带线的蜿蜒线结构，利用相邻微带线电流的空间耦合以及弯折处的不连续性，在超高频射频识别的微带线附近上方形成强磁场。在超高频射频识别的微带线末端连接匹配负载，使超高频射频识别的微 带线的强磁场得到均匀分布。The meander line structure of the UHF RFID microstrip line uses the spatial coupling of the current of the adjacent microstrip lines and the discontinuity at the bend to form a strong magnetic field near the UHF RFID microstrip line. Connect a matching load to the end of the UHF RFID microstrip line, so that the strong magnetic field of the UHF RFID microstrip line is evenly distributed.
超高频射频识别的微带线的长度可调，使用方便，使用者可根据需要选择蜿蜒周期合适的超高频射频识别的微带线，或者根据需要串联不同数量的超高频射频识别的微带线。超高频射频识别的微带线的长度可调整至数米至数十米。The length of the UHF RFID microstrip line is adjustable, easy to use, users can choose the appropriate UHF RFID microstrip line with a meandering period according to their needs, or connect different numbers of UHF RFID in series as needed Microstrip line. The length of the UHF RFID microstrip line can be adjusted from several meters to tens of meters.
本发明中的超高频射频识别的微带线具有相当出色的射频读取性能，成功地将电磁近场束缚在其正上方，彻底解决了超高频射频识别的漏读和误读问题。同时，经过小批量生产测试，验证了这种超高频射频识别的微带线具有宽频带适应性、宽温度适应性、宽加工容差、宽介电常数适应性。其金属接地平面还可以加工印刷电路，直接将射频前端和超高频射频识别的微带线合为一体，是一种极其出色并具有广泛实用价值的结构。The microstrip line of the UHF radio frequency identification in the present invention has quite excellent radio frequency reading performance, successfully restrains the electromagnetic near field directly above it, and completely solves the problems of missed reading and misreading of the UHF radio frequency identification. At the same time, after small batch production testing, it has been verified that this UHF radio frequency identification microstrip line has wide frequency band adaptability, wide temperature adaptability, wide processing tolerance, and wide dielectric constant adaptability. The metal ground plane can also process printed circuits, directly integrating the RF front end and the UHF radio frequency identification microstrip line, which is an excellent structure with extensive practical value.
【附图说明】【Explanation】
图1是本发明超高频射频识别的微带线上方放置金属板的结构示意图。FIG. 1 is a schematic structural view of a metal plate placed above the microstrip line of the UHF radio frequency identification of the present invention.
图2是超高频射频识别的微带线的结构示意图。FIG. 2 is a schematic diagram of the structure of a microstrip line for UHF radio frequency identification.
【具体实施方式】【detailed description】
参见图1至图2，给出了本发明中超高频射频识别的微带线，超高频射频识别的微带线采用PCB(Printed Circuit Board，印刷电路板)工艺加工，超高频射频识别的微带线包括介质基材1、形成于介质基材1上表面的导体2、形成于所述介质基材下表面的金属地3，所述金属地围绕在所述导体四周并延伸至介质基材1另一表面，延伸至所述导体四周的金属地与所述导体位于同一表面。超高频射频识别的微带线也可以没有围绕在导体四周的金属地，只有位于所述介质基材与所述导体2相对表面的金属地。Referring to FIGS. 1 to 2, the UHF radio frequency identification microstrip line in the present invention is given. The UHF radio frequency identification microstrip line is processed by PCB (Printed Circuit Board) technology, and the UHF radio frequency identification The microstrip line includes a dielectric substrate 1, a conductor 2 formed on the upper surface of the dielectric substrate 1, a metallic ground 3 formed on the lower surface of the dielectric substrate, the metallic ground surrounding the conductor and extending to the dielectric On the other surface of the substrate 1, the metal ground extending around the conductor is on the same surface as the conductor. The UHF radio frequency identification microstrip line may not have a metal ground surrounding the conductor, but only a metal ground located on the opposite surface of the dielectric substrate and the conductor 2.
所述导体2包括蜿蜒部21、位于所述蜿蜒部21两端并与所述蜿蜒部21一体成型的一对连接部22、23，其中一个连接部22连接匹配负载，另一个连接部23连接馈点。蜿蜒曲折的数目可以根据实际需要调节。导体2的长度可以自由延伸调节，可根据需要选择蜿蜒线的周期，也可以将若干个超高频射频识别的微带线通过同轴线缆连接起来，同轴线缆分别连接相邻两个超高频射频识别的微带线的连接部。同轴线缆将若干超高频射频识别的微带线串联 起来，再将首末两端的超高频射频识别的微带线的其中一个的连接端匹配负载，另一个连接馈点。The conductor 2 includes a meandering portion 21, a pair of connecting portions 22, 23 located at both ends of the meandering portion 21 and integrally formed with the meandering portion 21, one of the connecting portions 22 is connected to a matching load, and the other is connected Section 23 connects the feed points. The number of meanders can be adjusted according to actual needs. The length of the conductor 2 can be adjusted freely, the period of the meander line can be selected according to the need, or several UHF radio frequency identification microstrip lines can be connected through a coaxial cable, and the coaxial cables are respectively connected to two adjacent The connection part of a UHF radio frequency identification microstrip line. The coaxial cable connects several UHF RFID microstrip lines in series, and then connects the connection end of one of the UHF RFID microstrip lines at both ends to the load and the other to the feed point.
所述连接部22、23连接两个射频连接器5，其中一个射频连接器连接馈点，另一个连接与其串联的超高频射频识别的微带线的射频连接器或者匹配负载。所述围绕在导体2四周的金属地3具有两个开槽31，所述连接部22、23穿过所述开槽并与所述射频连接器5连接。The connection parts 22 and 23 are connected to two radio frequency connectors 5, one of which is connected to the feed point, and the other is connected to the radio frequency connector of the ultra-high frequency radio frequency identification microstrip line connected thereto or a matched load. The metal ground 3 surrounding the conductor 2 has two slots 31 through which the connecting portions 22 and 23 pass and are connected to the radio frequency connector 5.
本发明中的超高频射频识别的微带线易于加工，成本可控，而且馈点简单、频率贷款可以达到百兆以上。The ultra-high frequency radio frequency identification microstrip line in the present invention is easy to process, the cost is controllable, and the feed point is simple, and the frequency loan can reach more than 100 trillion.
超高频射频识别的微带线的蜿蜒线结构，利用相邻微带线电流的空间耦合以及弯折处的不连续性，在超高频射频识别的微带线附近上方形成强磁场。在超高频射频识别的微带线末端连接匹配负载，使超高频射频识别的微带线的强磁场得到均匀分布，即同一个点在不同的时间可能是波峰，可能是波谷。如图1所示，最上面长方形的金属板4对超高频射频识别的微带线性能影响很小，进一步反应超高频射频识别的微带线的近场特性。The meander line structure of the UHF RFID microstrip line uses the spatial coupling of the current of the adjacent microstrip lines and the discontinuity at the bend to form a strong magnetic field near the UHF RFID microstrip line. Connect the matching load to the end of the UHF RFID microstrip line, so that the strong magnetic field of the UHF RFID microstrip line is evenly distributed, that is, the same point may be a peak or a trough at different times. As shown in FIG. 1, the uppermost rectangular metal plate 4 has little effect on the performance of the UHF radio frequency identification microstrip line, and further reflects the near-field characteristics of the UHF radio frequency identification microstrip line.
同时，超高频射频识别的微带线的长度可调，使用方便，使用者可根据需要选择蜿蜒周期合适的超高频射频识别的微带线，或者根据需要串联不同数量的超高频射频识别的微带线。超高频射频识别的微带线的长度可调整至数米至数十米，蜿蜒部21的蜿蜒周期可以扩展到很多，只要传播结构或者介质基材的射频损耗足够小即可。超高频射频识别的微带线还可以彼此级联，从而构成更长或者异形的超高频射频识别的微带线。At the same time, the length of the UHF radio frequency identification microstrip line is adjustable, easy to use, users can choose the appropriate UHF radio frequency identification microstrip line with a meandering period, or connect different numbers of UHF in series Radio frequency identification microstrip line. The length of the UHF radio frequency identification microstrip line can be adjusted from several meters to several tens of meters, and the meandering period of the meandering part 21 can be extended to many as long as the radio frequency loss of the propagation structure or the dielectric substrate is small enough. UHF radio frequency identification microstrip lines can also be cascaded with each other, thereby forming a longer or irregular UHF radio frequency identification microstrip line.
超高频射频识别的微带线与超高频射频识别读写器相连，用于识别、读取或写入位于超高频射频识别的微带线上方区域的近场射频识别电子标签。The UHF radio frequency identification microstrip line is connected to the UHF radio frequency identification reader, and is used to identify, read or write the near field radio frequency identification electronic tag located in the area above the UHF radio frequency identification microstrip line.
本发明中的超高频射频识别的微带线具有相当出色的射频读取性能，成功地将电磁近场束缚在其正上方，彻底解决了超高频射频识别的漏读和误读问题。同时，经过小批量生产测试，验证了这种超高频射频识别的微带线具有宽频带适应性、宽温度适应性、宽加工容差、宽介电常数适应性。其金属接地平面还可以加工印刷电路，直接将射频前端和超高频射频识别的微带线合为一体，是一种极其出色并具有广泛实用价值的结构。The microstrip line of the UHF radio frequency identification in the present invention has quite excellent radio frequency reading performance, successfully restrains the electromagnetic near field directly above it, and completely solves the problems of missed reading and misreading of the UHF radio frequency identification. At the same time, after small batch production testing, it has been verified that this UHF radio frequency identification microstrip line has wide frequency band adaptability, wide temperature adaptability, wide processing tolerance, and wide dielectric constant adaptability. The metal ground plane can also process printed circuits, directly integrating the RF front end and the UHF radio frequency identification microstrip line, which is an excellent structure with extensive practical value.
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施 方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。In addition, it should be understood that although the description is described according to the embodiments, not every embodiment only includes an independent technical solution. This description of the description is only for clarity, and those skilled in the art should take the description as a whole The technical solutions in the embodiments can also be combined appropriately to form other implementations that can be understood by those skilled in the art.

Claims (9)

  1. 一种超高频射频识别的微带线，所述超高频射频识别的微带线包括介质基材(1)、形成于介质基材(1)一表面的导体(2)、形成于所述介质基材另一表面的金属地(3)，其特征在于，所述导体(2)包括蜿蜒部(21)、位于所述蜿蜒部(21)两端并与所述蜿蜒部一体成型的一对连接部(22、23)，其中一个连接部(22)连接匹配负载，另一个连接部(23)连接馈点。An UHF radio frequency identification microstrip line, the UHF radio frequency identification microstrip line includes a dielectric substrate (1), a conductor (2) formed on a surface of the dielectric substrate (1), A metal ground (3) on the other surface of the dielectric substrate, characterized in that the conductor (2) includes a meandering part (21), located at both ends of the meandering part (21) and connected to the meandering part A pair of integrally formed connecting portions (22, 23), one of the connecting portions (22) is connected to the matching load, and the other connecting portion (23) is connected to the feeding point.
  2. 根据权利要求1所述的超高频射频识别的微带线，其特征在于，所述超高频射频识别的微带线数量具有若干个，所述若干个超高频射频识别的微带线通过线缆串联，位于首末两端的连接部，其中一个连接部连接匹配负载，另一个连接部连接馈点。The UHF radio frequency identification microstrip line according to claim 1, wherein the number of the UHF radio frequency identification microstrip lines is several, and the plurality of UHF radio frequency identification microstrip lines The cables are connected in series, and the connecting parts located at both ends of the first and last ends, one of the connecting parts is connected to the matching load, and the other connecting part is connected to the feeding point.
  3. 根据权利要求1或2所述的超高频射频识别的微带线，其特征在于，所述连接部通过射频连接器连接接匹配负载、馈点或者另一个超高频射频识别的微带线的射频连接器。The UHF radio frequency identification microstrip line according to claim 1 or 2, wherein the connection part is connected to a matching load, a feed point or another UHF radio frequency identification microstrip line through a radio frequency connector RF connector.
  4. 根据权利要求3所述的超高频射频识别的微带线，其特征在于，所述超高频射频识别的微带线的金属地延伸至所述导体四周，延伸至所述导体四周的金属地与所述导体位于同一表面。The UHF radio frequency identification microstrip line according to claim 3, wherein the metal ground of the UHF radio frequency identification microstrip line extends around the conductor and extends to the metal around the conductor The ground is on the same surface as the conductor.
  5. 根据权利要求4所述的超高频射频识别的微带线，其特征在于，所述围绕在导体四周的金属地具有两个开槽，所述连接部穿过所述开槽并与所述射频连接器连接。The UHF radio frequency identification microstrip line according to claim 4, characterized in that the metal ground surrounding the conductor has two slots, and the connecting portion passes through the slot and connects with the RF connector connection.
  6. 根据权利要求1所述的超高频射频识别的微带线，其特征在于，所述超高频射频识别的微带线的强磁场均匀分布。The UHF radio frequency identification microstrip line according to claim 1, wherein the strong magnetic field of the UHF radio frequency identification microstrip line is evenly distributed.
  7. 根据权利要求2所述的超高频射频识别的微带线，其特征在于，所述线缆为同轴电缆。The UHF radio frequency identification microstrip line according to claim 2, wherein the cable is a coaxial cable.
  8. 根据权利要求1所述的超高频射频识别的微带线，其特征在于，所述超高频射频识别的微带线至多为10米。The UHF radio frequency identification microstrip line according to claim 1, wherein the UHF radio frequency identification microstrip line is at most 10 meters.
  9. 一种超高频射频识别读写器，其特征在于，与上述任一权利要求中的超高频射频识别的微带线连接，用于识别、读取或写入位于超高频射频识别的微带线上方区域的近场射频识别电子标签。An UHF radio frequency identification reader, characterized in that it is connected to the UHF radio frequency identification microstrip line according to any of the preceding claims, and is used to identify, read or write to the UHF radio frequency identification Near-field radio frequency identification electronic tags in the area above the microstrip line.
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