WO2011088597A1 - 小型化射频识别标签及其中的微带贴片天线 - Google Patents

小型化射频识别标签及其中的微带贴片天线 Download PDF

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Publication number
WO2011088597A1
WO2011088597A1 PCT/CN2010/000429 CN2010000429W WO2011088597A1 WO 2011088597 A1 WO2011088597 A1 WO 2011088597A1 CN 2010000429 W CN2010000429 W CN 2010000429W WO 2011088597 A1 WO2011088597 A1 WO 2011088597A1
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WO
WIPO (PCT)
Prior art keywords
frequency identification
radio frequency
identification tag
patch antenna
microstrip patch
Prior art date
Application number
PCT/CN2010/000429
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English (en)
French (fr)
Inventor
刘智佳
Original Assignee
Liu Zhijia
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=42449144&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2011088597(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Liu Zhijia filed Critical Liu Zhijia
Priority to US13/574,360 priority Critical patent/US8678295B2/en
Priority to EP10843640.3A priority patent/EP2525441A4/en
Priority to SG2012052718A priority patent/SG182571A1/en
Priority to KR1020147014914A priority patent/KR20140075021A/ko
Publication of WO2011088597A1 publication Critical patent/WO2011088597A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means

Definitions

  • the present invention relates to miniaturized radio frequency identification tags and antennas thereof, and more particularly to miniaturized radio frequency identification tags and antennas thereof that can be used in a metal environment. Background technique
  • Radio Frequency Identification is a non-contact automatic identification technology that automatically identifies target objects and acquires relevant data through RF signals. The identification work can be performed in a variety of harsh environments without manual intervention.
  • RFID is a wireless system consisting of an interrogator (or reader [Reader]) and a number of transponders (or tags [Tag]).
  • readers or reader [Reader]
  • tags or tags
  • radio frequency identification tags are attached to objects made up of multiple materials and shapes; therefore, existing radio frequency identification tags have a limit of use in a metal environment and are stable.
  • the cognitive characteristics are often the basic design requirements for tag antennas.
  • the proper design of the RFID tag antenna is also particularly important in order to maximize the functionality of the read range. Therefore, it is necessary to transmit the maximum power without loss to the RFID chip as much as possible. Therefore, it must have good radiation characteristics and be completely integrated with the tag chip.
  • the RFID tag chip has a function of recording a variety of information and also reading the saved information.
  • the return loss characteristics of the antenna and the characteristics of the Radiation Pattern are very sensitive, so it is necessary to pay attention when designing the antenna.
  • the dipole antenna is close to the metal body, electromagnetic waves cannot be radiated, and according to the reflected wave on the metal surface, the power required for the radio frequency identification tag chip driving cannot be ensured, and the parasitic capacitance between the metal surface and the antenna [Capacitance] Changes in composition, resonance frequency [Resonance Frequency], 'Antenna', impedance [Impedance], and Radiation Efficiency [RadiationEfficiency] also change.
  • the existing identification tags used in the past are between the metal body and the tag antenna.
  • a variety of materials are inserted to maintain the RFID tag at a certain distance from the metal to make the tag antenna.
  • the tag antenna thus manufactured is somewhat inconvenient when used in practical products. In different environments, such as different metal bodies, different shapes, etc., such tag antenna requirements are different, which is not conducive to mass production, and Depending on the environment in which it is used, it may cause damage to the label, especially if the thickness and size become large, which is not conducive to miniaturization.
  • an antenna used as a Gomnd for an antenna should be considered as a metal-attached tag antenna.
  • the microstrip patch antenna is relatively easy to manufacture, but the resonant frequency is designed to be half wavelength. Therefore, it appears to be a disadvantage when making a tag antenna.
  • the structure of the microstrip patch antenna may appear as a metal. Side effects, that is, the production of ultra high frequency.
  • the PIFA antenna is designed to have a size of 1/4 wavelength at the resonance frequency, which makes it possible to miniaturize, but the problem that comes with it is that the manufacturing process is cumbersome and, when attached to the metal body, The material and shape of the metal surface are different, and the resonance characteristics of the antenna also change.
  • the present invention has been made to solve the above problems, and an object thereof is to provide a miniaturized radio frequency identification tag of a microstrip patch antenna [Microstrip Patch Antenna] which uses a metal body as a ground of an antenna, and does not lower the antenna when attached to a metal body.
  • an object of the present invention is to provide a power supply portion as a microstrip and directly connect it to a radiation portion; in order to connect the radio frequency identification chip, the position of the power supply portion is designed to be on the upper, lower, and side sides of the dielectric.
  • a miniaturized RFID tag antenna that can be easily connected anywhere and an RFID tag that utilizes it.
  • an object of the present invention is to provide a radiographic portion having a slit (Slit) in a case where the radio frequency identification label has a small attachment space, and the radio frequency can be obtained even in an area smaller than a normal ⁇ /2 resonance length.
  • the electrical half-wavelength of the identified frequency band is designed to be an ultra-small-sized RFID tag antenna of the same length and a radio frequency identification tag using the same.
  • the object of the present invention is to provide a relatively simple manufacturing process and a relatively low manufacturing cost, and a radio frequency identification tag antenna of various frequency bands can be easily manufactured by a simple method, and To achieve an ultra-compact metal-attached RFID tag antenna and a radio frequency identification tag using the same.
  • Another object of the present invention is to miniaturize a radio frequency identification tag antenna of a ceramic which is designed as an intrinsic current for designing an ultra-miniature RFID tag antenna and a radio frequency identification tag using the same.
  • the present invention provides a microstrip patch antenna in a miniaturized radio frequency identification tag, comprising a power supply portion and a radiation portion connected to each other, wherein at least one slit is formed on both sides of the radiation portion.
  • the radio frequency identification tag further includes at least a chip, and the power supply unit is connected to the chip through a microstrip line.
  • the slit may be any one of a circle, an ellipse, and a polygon.
  • the size of the slit is adjustable.
  • the radiation portion is one of a circular shape, an elliptical shape, and a polygonal shape.
  • the microstrip patch antenna in the miniaturized radio frequency identification tag further includes a metal ground layer, and the metal ground layer, the radiation portion, and the power supply portion are made of silver.
  • a miniaturized radio frequency identification tag including: a chip, a dielectric, and a microstrip patch antenna, wherein the microstrip patch antenna and a ground layer are attached to a surface of the dielectric, the microstrip patch antenna
  • the power supply unit and the radiation unit are connected to each other, and the power supply unit and the chip are connected by a microstrip line.
  • the periphery of the chip has a protective coating disposed according to the height of the chip, and the protective coating may be ceramic, rubber or the like.
  • the dielectric is ceramic.
  • the microstrip patch antenna further includes a ground layer having a connection portion, the power supply portion and the radiation portion are disposed on a side opposite to the ground layer, and the power supply portion and the connection portion connect the chip On the same side as the microstrip patch antenna, or on the same side of the ground plane, or on one side of the microstrip patch antenna and ground plane. There is a gap between the two sides of the power supply portion and the radiation portion.
  • the radiation portion is one of a circular shape, an elliptical shape, and a polygonal shape.
  • the microstrip patch antenna and ground plane are made of silver.
  • the two sides of the radiation portion have at least one opening, and the slit may be one of a circular shape, an elliptical shape and a polygonal shape.
  • the size of the slit is adjustable.
  • the antenna of the miniaturized radio frequency identification tag based on the length and width of the radiation portion or the bottom surface, the length and width of the slit Slit formed on the radiation body, and the desired resonance frequency and various labels Chip matching is the purpose of impedance matching.
  • the power supply method uses the [L strip] [Micro strip], which can position the power supply unit according to the application environment, at any position of the top, bottom, and side, and the chip is embedded. After that, it does not "bump out,” and is not easily damaged by an external environment. Since the antenna can be formed in a simple Print form, it can be used not only in mass production but also in miniaturized metal bodies due to its low manufacturing cost. Advantages in the field of adhesive applications.
  • Miniaturized radio frequency identification tag antenna based on the present invention, as a label attached to metal Even if it is attached to a variety of metals, it will not degrade performance and maintain a stable recognition rate. Due to its simple production, it can realize a variety of changes, and it has the advantage of being easily applicable to a wide range of applications.
  • FIG. 1 is a perspective view of a metal-attached UHF band RFID tag antenna according to an embodiment of the present invention
  • Figure 2 is a side view of Figure 1;
  • Figure 3 is a detailed view of the power supply portion and the radiation portion of the microstrip patch antenna of the present invention in Figure 1;
  • Figure 4 is a center frequency measurement map of the present invention based on Figure 1;
  • Figure 5 is a diagram showing the return loss measurement of the present invention based on Figure 1;
  • Fig. 6 is a graph showing the measurement results of the reading range of the present invention based on Fig. 1.
  • Radio Frequency Identification technology is a technique for attaching electronic tags to various things and recognizing things by wirelessly recognizing the inherent ID of things.
  • the radio frequency identification system uses a plurality of frequency bands in the frequency band of 125 kHz to 5.8 GHz in the applicable field.
  • the frequency of operation of the RFID system has increased to above the UHF band.
  • the design of the RFID tag antenna becomes a very important factor in maximizing the performance of the system in the read range.
  • the miniaturized radio frequency identification tag antenna of the present invention integrated with the tag chip constitutes a complete impedance, and is composed of a power supply unit and a radiation unit in a large aspect.
  • the power supply unit rectifies electromagnetic waves output from the reader/writer to obtain an operation power supply, and supplies the operation power to the radiation unit.
  • the above power supply unit is connected to the four corners of the radio frequency identification tag chip. Shaped space.
  • the passive RFID tag chip is placed in the space of the above quadrilateral.
  • the radiator is directly connected to the power supply unit via a microstrip line, and has an electrical length of about 1/2 of a desired wavelength length.
  • the radiator receives the output electromagnetic wave from the reader/writer, and obtains an operation power supply from the power supply unit to complete the action of radiating electromagnetic waves, and has an electrical half-wavelength length of the used radio frequency identification band.
  • the miniaturized radio frequency identification tag (100) of the present invention includes: a ground layer (10) a ceramic dielectric (20) on the ground layer (10), a radiation portion (30) on the ceramic dielectric (20), and a microstrip [Micro strip] power supply portion (31) connected to the radiation portion (30). .
  • the microstrip [Micro strip] power supply unit (31) is formed by electrically connecting the connection portion 11 of the ground layer 10 to the side surface in order to supply power to the chip (33) on the side surface at a 90 degree angle.
  • the chip may also be disposed above or below the dielectric (20), that is, in the same plane as the power supply portion (31) or the ground layer (10).
  • the radiation portion (30) is basically a patch antenna having a resonance length of ⁇ /2, and the radiation portion (30) is formed with at least a slit S32 (32), which can be maintained even in a smaller area.
  • ⁇ /2 resonance length thereby greatly reducing the size of the miniaturized radio frequency identification tag (100), and the shape of the slit (32) can also be embodied in various shapes such as a circle, an ellipse, and a polygon.
  • the resonance frequency of the tag antenna (100) can be adjusted, that is, when the label product is in use, if the different standard requirements of different regions are met, the slit can be adjusted, It is necessary to replace the product or the antenna, which is more advantageous for mass production of the product; in this embodiment, the length of the slit Slit is 1/3 of the width of the radiation portion (30), and the width of the Slit is not more than 0.5 mm, which is ideal.
  • the miniaturized radio frequency identification tag (100) of the present invention produces a ⁇ /2 resonance.
  • a passive radio frequency identification chip IC Chip (33) is provided on the side of the terminal of the microstrip [micro strip] power supply unit (31) connected to the above-mentioned radiator (30).
  • FIG. 2 it is a side view of FIG. 1.
  • a ground layer Ground (10) constituting a tag antenna, and an upper portion of the ground layer Ground (10) forms a ceramic dielectric (20).
  • the power supply unit (31) of the strip the power supply unit (31) of the microstrip [micro strip] is electrically connected to the side surface so that the power supply to the side surface is bent at 90°.
  • the miniaturized radio frequency identification tag (100) is a microstrip patch antenna structure using ⁇ /2 resonance, and since the maximum point and the minimum point of the electric field simultaneously occur on the radiator (30), Attaching the miniaturized radio frequency identification tag (100) to any metal surface can be used without changing the performance of the tag antenna.
  • the ceramic dielectric (20) is made of a ceramic material having an intrinsic current.
  • the periphery of the chip (33) may have a protective coating disposed according to the height of the chip, for example, coated with a ceramic layer. , or a rubber layer, etc., to protect the chip.
  • the miniaturized radio frequency identification tag (100) has a total length of 12 to 25 mm, a width of 10 mm, and a thickness of 1.5 to 3 mm, that is, the use of ultra-small size is possible.
  • FIG. 1 is a detailed view of a power supply portion and a radiation portion of the microstrip patch antenna of the present invention. As shown in the figure, in the microstrip patch antenna of the present invention, the radiation portion (30) and the microstrip
  • the power supply unit (31) of the [MicroStrip] is connected, and the microstrip [micro strip] power supply unit (31) connects the chip to the side surface in a form of being bent at 90 degrees for the side power supply, and is connected to the side microstrip [Micro strip]
  • the chip at the terminal of the power supply unit (31) is a passive RFID chip IC
  • the overall size of the miniaturized radio frequency identification tag (100) forming the Slit is 13 mm x 9 mm x 3 mm, and the power supply portion (31) and ground of the above-mentioned radiator (30) and microstrip [micro strip] are obtained.
  • the miniaturized radio frequency identification tag (100) can be adjusted according to the change of the length [L], the width [W], and the interval [D] between the microstrip [Microstrip] power supply unit (31) and the radiator.
  • the microstrip [Micro strip] power supply portion (31) is adjusted to be longer [L] within 10 mm and wider [W] for impedance matching. Within 3 mm, the distance [D] with the radiator is within 1 mm.
  • the center frequency measurement map of the present invention based on Fig. 1 is used to measure the frequency change according to the size of the metal surface of the miniaturized radio frequency identification tag (100).
  • the resonance frequency of the miniaturized radio frequency identification tag (100) of the present invention changes according to the size of the substance attached to the metal surface.
  • the amount is 5MHz.
  • FIG. 5 is based on the return loss measurement [Return Loss] of the present invention.
  • the size of the radio frequency identification tag (100) attached to the metal surface is measured as a result of the change in return loss [Return Loss].
  • the size of the miniaturized radio frequency identification tag (100) attached to the metal surface is changed, and the return loss of the miniaturized radio frequency identification tag (100) of the present invention is based on the size of the substance attached to the metal surface [ Return Loss] has a 2dB change at maximum.
  • the miniaturized radio frequency identification tag (100) of the present invention has nothing to do with the size of the substance attached to the metal surface in the case of a slow change in the center frequency and the return loss [Return Loss].
  • Fig. 6 which is a measurement result of the reading range of the present invention based on Fig. 1, the result is measured by a Handheld Reader Antenna using a circularly polarized antenna having an output of 28 dBm.
  • the miniaturized radio frequency identification tag (100) does not adhere to the metal surface to have a reading range of up to 8 cm when measuring the reading range, and the size of the metal substance attached to the metal is 20 x 20 mm, the maximum is 49 cm, 60 x 60 mm. The time is reflected as a reading range of up to 56 cm.
  • the miniaturized radio frequency identification tag (100) when attached to the metal, the reading range is independent of the size of the substance attached to the metal surface, and there is no great difference, and therefore, in a fragile metal environment. A variety of functions can be achieved.

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Description

小型化射频识别标签及其中的微带贴片天线 技术领域
本发明是关于小型化射频识别标签及其天线， 更详细来说， 是关于能 够在金属环境下的使用小型化射频识别标签及其天线。 背景技术
射频识别 （Radio Frequency Identification)是一种非接触式的自动识 别技术， 它通过射频信号自动识别目标对象并获取相关数据， 识别工作无 须人工干预， 可工作于各种恶劣环境。 RFID是一种无线系统， 由一个询 问器 （或阅读器 [Reader] ) 和很多应答器 （或标签 [Tag] ) 组成。 标签上使 用的天线，在附着于金属材质表面时， 一般的标签在不同位置上具有不稳 定的识别率， 并需要考虑金属环境的不同。
与被动型射频识别的识读 [Reader]不同， 射频识别标签是附着于由多 种材质和不同形状构成的物体上使用；所以现有射频标识标签在金属环境 下就有使用极限，而具有稳定的认识特性又常常是标签天线的基本设计要 求。
在射频识别技术中， 为了使读取范围的功能达到最大化，射频识别标 签天线的适当的设计也尤为重要。 因此， 需要尽可能将最大的电力无损失 的传达到射频识别芯片上， 为此， 须具有良好的放射特性的同时， 还要与 标签芯片完整的结合。 通常， 射频识别标签芯片具有可以记录多种信息， 还能识读被保存的信息的功能。
射频识别标签天线附着于金属体上时，天线的回波损耗特性和放射模 式 [Radiation Pattern]的特性会非常敏感地受到影响， 因此需要在设计天 线时予以注意。 一般， 使偶极子天线接近金属体时， 不能放射电磁波， 而 根据金属表面的反射波， 无法保证射频识别标签芯片驱动所需要的电力， 且随着金属表面和天线之间的寄生电容 [Capacitance]成分的变化， 共振 频率 [Resonance Frequency]、 '天线 [Antenna]、 阻抗 [Impedance]及放射效率 [RadiationEfficiency]等特性也会发生变化。
因此， 过去所采用的现存的标识型标签， 是在金属体和标签天线之间 插入各种各样的物质， 以使得射频识别标签与金属保持一定间隔的方法， 来制作标签天线的。 然而， 这样制造的标签天线用在实际常用产品上时多 少有些不便， 在不同环境下， 例如不同的金属体、 不同的形状等等， 这样 的标签天线要求有所不同， 不利于批量生产， 且根据使用环境会引起标签 的损伤， 特别是厚度及大小变大， 不利于小型化化。
因此， 将金属体作为天线的 Gomnd来使用的天线， 应被考虑为金属 体附着型标签天线。
作为此种类的代表性天线被广泛熟悉的就是微带贴片天线
[Microstrip Patch Antenna]和 PIFA[Planar Inverted-F Antenna]天线。
通常，微带贴片天线的制造相对容易， 然而共振频率上被设计成半波 长的大小， 因此在制作标签天线时显得偏大一些成为其缺点， 另外， 微带 贴片天线的结构会出现金属副作用， 即产生超高频。 与其相比， PIFA天 线在共振频率上设计成 1/4波长的大小， 由此小型化化变为可能， 但随之 而来的问题是制造工程烦瑣， 且附着于金属体时， 随着金属表面的材质和 形状不同， 天线的共振特性也发生变化。
有鉴于此， 如何提供一种射频识别标签及其天线， 来解决上述问题已 成为业界亟待解决的技术问题。 发明内容
本发明作为解决上述问题，其目的在于提供将金属体作为天线的地面 来使用的微带贴片天线 [Microstrip Patch Antenna]的小型化射频识别标 签， 其附着于金属体上时， 不会降低天线的性能， 且在各个位置上能拥有 稳定的认识率的小型化射频识别标签天线及利用它的射频识别标签。
另外， 本发明的目的在于提供， 将供电部设计成微带 [Microstrip] , 并 使其与放射部直接连接； 为了连接射频识别芯片， 将供电部的位置设计成 在电介质的上、 下、侧面的任何一处都可以容易连接的小型化射频识别标 签天线及利用它的射频识别标签。
同时， 本发明的目的在于提供， 在射频识别标签附着空间狭小的情况 下， 放射部具备一字型切口 （Slit ) , 即便是在小于正常的 λ/2共振长度的 面积中，也可以将射频识别频带的电气性半波长设计成相同长度的超小型 化射频识别标签天线及利用它的射频识别标签。
再者， 本发明的目的在于提供， 制造工程比较简单， 制造费用相对低 廉， 可以用简单的方法很容易地制造各种频带的射频识别标签天线， 并可 以实现超小型化的金属附着型射频识别标签天线及利用它的射频识别标 签。
本发明的目的还在于为了设计超小型化的射频识别标签天线而将电 介质设计成固有电流的陶瓷的小型化射频识别标签天线及利用它的射频 识别标签。
基于上述目的，本发明提供一种小型化射频识别标签中的微带贴片天 线， 包括相互连接的供电部及放射部， 其中， 所述放射部两侧至少具有一 切口。
其中， 所述射频识别标签至少还包括芯片， 所述供电部是通过微带线 与所述芯片连接。
在具体实施例中， 所述切口可以是圆形、 椭圆形、 多边形中的任意一 种。 所述切口的大小是可调节的。 所述供电部两侧与所述放射部之间具有 间隔。 所述放射部为圆形、 椭圆形、 多边形中的一种。
另外， 所述小型化射频识别标签中的微带贴片天线还包括金属接地 层， 而上述金属接地层、 放射部、 和供电部是由银制成。
提供一种小型化射频识别标签， 包括： 芯片、 电介质、 及微带贴片天 线， 其中， 所述微带贴片天线及接地层是附着在所述电介质的表面， 所述 微带贴片天线包括相互连接的供电部及放射部，所述供电部与所述芯片通 过微带线连接。
在具体实施例中，所述芯片周边具有根据所述芯片的高度而设置的保 护涂层， 而所述保护涂层可以是陶瓷、 橡胶等。 所述电介质为陶瓷。 所述 微带贴片天线还包括具有连接部的接地层，所述供电部和放射部是设置在 与所述接地层相对的一面，且所述供电部与所述连接部将所述芯片连接在 与所述微带贴片天线同一面上、或与所述接地层同一面上、或所述微带贴 片天线和接地层连接的一个侧面上。所述供电部两侧与所述放射部之间具 有间隔。 所述放射部为圓形、 椭圓形、 多边形中的一种。 所述微带贴片天 线及接地层是由银制成。
而上述放射部两侧至少具有一切口， 所述切口可以是圆形、 椭圓形、 多边形中的一种。 所述切口的大小是可调节的。
根据如上所述的基于本发明的小型化射频识别标签中的天线，基于放 射部或底面的长度及宽度、 放射体上形成的切口 Slit的长度和宽度， 具有 以理想的共振频率及多种标签芯片匹配为目的的阻抗易匹配的优点；供电 方式上因使用了^ L带 [Micro strip] , 可以将供电部的位置根据应用的环 境， 在上、 下、 侧面的任意一处， 且芯片嵌入后不 "凸出，， ， 不易受到外 接环境造成的损伤， 因能够以简单的 Print形态构成天线， 所以， 不仅可以 大量生产， 而且还因其低廉的制造费用， 具有可使用于小型化金属体附着 型应用领域上的优点。
基于本发明的小型化射频识别标签天线， 作为附着于金属的标签制 品， 即使附着于多种形态的金属上也不会降低性能， 并能保持稳定的认识 率； 因制作简单， 可实现多样形态的变化， 具有很容易适用于广阔的应用 领域上的优点。 附图说明
图 1是基于本发明的一实施例的可附于金属的 UHF带射频识别标签天 线的立体图；
图 2是图 1的侧面图；
图 3是图 1 中本发明的微带贴片天线的供电部和放射部的详细图； 图 4是基于图 1的本发明中心频率测定图；
图 5是基于图 1的本发明回波损耗测定图；
图 6是基于图 1的本发明读取范围的测定结果图。
具体实施方式
以下通过特定的具体实例说明本发明的实施方式， 本领域技术人员可 由本说明书所揭示的内容轻易地了解本发明的其他优点与功效。 本发明也 可通过其他不同的具体实例加以实施或应用， 本说明书中的各项细节亦可 基于不同观点与应用， 在不背离本发明的目的下进行各种修饰与变更。
射频识另' Radio Frequency Identification)技术， 是在各事物上附着电子 标签， 通过无线认识事物的固有 ID， 对事物进行识别的技术。 射频识别 系统，按适用领域在 125kHz的频带至 5.8GHz的微波带，使用着多种频带。
最近， 在流通物流领域等， 随着对远距离识别要求的增加， 射频识别 系统的动作频率提高至超高频 （UHF ) 带以上。 随着频率的增加， 在读取 范围的系统性能最大化上，射频识别标签天线的设计成为非常重要的因素。
特别是在没有额外的电池， 通过对读卡器输出的电磁波信号进行整流 而获得自身动作电源的被动型射频识别标签天线的情况下， 以尽可能最大 限度地控制电能损耗来传达到标签芯片上， 为此， 应伴随良好的放射特性 形成与标签芯片的完整的阻抗整合。
与标签芯片构成完整的阻抗整合的本发明下的小型化射频识别标签天 线， 从大的方面是由供电部、 及放射部来构成的。
上述供电部是对从读写器输出的电磁波进行整流来获得动作电源， 并 将该动作电源供给放射部。 上述供电部是由连接射频识别标签芯片的四角 形空间构成的。
此时， 被动型射频识别标签芯片就置于上述四角形的空间上。
上述放射体与上述供电部通过微带线直接连接， 具有理想的波长长度 的约 1/2的电气长度。
上述放射体从读写器获得所输出的电磁波， 并从上述供电部得到动作 电源， 完成放射电磁波的作用， 拥有使用的射频识别频带的电气性半波长 长度。
下面， 参照附加图纸， 详细说明本发明的实施例。 在说明本发明时， 为了避免本发明要旨的含糊不清， 将省略有关公布功能或对于构成的具体 说明。
请参阅图 1， 是基于本发明的一实施例的可附于金属的 UHF带射频识 别标签天线的立体图，如图所示，本发明的小型化射频识别标签（100)包括： 接地层（10)、 接地层（10)的上的陶瓷电介质（20)、 陶瓷电介质（20)上的放射 部（30)和上述放射部（30)连接的微带 [Micro strip]供电部（31)所形成。 上述微 带 [Micro strip]供电部（31)为了给在侧面的芯片 （33 )供电， 是以 90度弯曲 的形态， 与接地层 10具有的连接部 11将电气连接到侧面而形成。 当然， 在其他实施例中， 所述芯片也可以设置在所述电介质 （20 ) 的上面或者下 面， 即与所述供电部 （31 ) 或者接地层 （ 10 ) 同一平面。
更详细来说， 上述放射部 (30)基本上是拥有 λ/2共振长度的贴片天线， 上述放射部 (30)上形成至少一切口 Slit(32)，即使是更小的面积也能保持 λ/2 共振长度， 由此大幅缩小小型化射频识别标签（100)的大小， 切口（32)的形 状也可以体现为圆形、 椭圆形、 多边形等多种形状。
通过调整上述切口 Slit(32)的长度和宽度，可以调节标签天线（100)的共 振频率， 即在标签产品在使用过程中， 如遇到不同区域不同标准要求时， 可以对切口进行调整， 不需要再进行产品或者天线的更换， 这样更有利于 产品批量生产；本实施例中，切口 Slit的长度是上述放射部 (30)宽度的 1/3， Slit的宽度不超过 0.5mm, 作为理想的一个实施例， 本发明的小型化射频 识别标签（100)产生 λ/2共振。
而且，与上述放射体 (30)连接的微带 [Micro strip]供电部（31)终端的侧面 上， 具有被动型射频识别芯片 IC Chip(33)。
请参阅图 2， 是图 1的侧面图， 如图所示， 构成标签天线的接地层 Ground(lO), 上述接地层 Ground(lO)的上部形成陶瓷电介质（20), 在上述陶 strip]的供电部（31), 上述微带 [Micro strip]的供电部（31)为了侧面的供电以 90°弯曲的形态将电气连接到侧面。
更详细来说， 上述小型化射频识别标签（100)作为利用 λ/2共振的微带 贴片天线构造， 因电场的最大点及最小点同时发生在上述放射体 (30)上， 所以， 无论将小型化射频识别标签 (100)附着于任意的金属面上， 都可以在 标签天线的性能不发生变化的情况下使用。
上述陶瓷电介质 (20)是由固有电流的陶瓷材质构成的，而在其他实施例 中，上述芯片（33 )周边可以具有根据所述芯片的高度而设置的保护涂层， 例如涂布有陶瓷层、 或橡胶层等， 用以保护芯片。
同时， 作为理想的一实施例， 上述小型化射频识别标签（100)的构成是 全长 12 ~ 25mm， 宽 10mm, 厚度 1.5 ~ 3mm以内， 即超小型化的使用成为 可能。
请参阅图 3， 图 1 中本发明的微带贴片天线的供电部和放射部的详细 图， 如图所示， 本发明的微带贴片天线中上述放射部 (30)与上述微带
[MicroStrip]的供电部 (31 )连接， 上述微带 [Micro strip]供电部 (31 )为了侧面 的供电， 弯曲成 90度的形态将芯片连接至侧面， 连接至上述侧面的微带 [Micro strip]供电部（31 )的终端处上的芯片是被动型射频识别芯片 IC
Chip(33 上述供电部两侧与所述放射部之间具有间隔 [D]。
更详细来说， 上述形成 Slit的小型化射频识别标签（100)的全体大小为 13 mmx 9mm x 3mm, 上述放射体 (30)和微带 [Micro strip]的供电部（31)、 Ground为了获得高电导率， 由银 [Ag]构成。
特别是， 根据上述微带 [Microstrip]供电部 (31)的长度 [L]、 宽度 [W]、 与 放射体之间的间隔 [D]的变化， 可调节小型化射频识别标签（100)的虛数阻 抗和实数阻抗。
特别是， 本实施例中， 将放射部的面积最大化的同时， 为了阻抗匹配， 可望将上述微带 [Micro strip]供电部 (31)调整为长 [L] 10mm以内， 宽 [W]为 3mm以内， 与放射体间的距离 [D]为 1mm以内。
请参阅图 4 , 是基于图 1的本发明中心频率测定图， 按照小型化射频 识别标签（ 100 )附肴的金属面的大小， 测定频率变化的结果。
更详细来说， 提供了小型化射频识别标签（100)附着在金属表面的大小 的变化， 根据附着在金属表面的物质的大小， 本发明的小型化射频识别标 签（100)的共振频率的变化量为 5MHz。
请参阅图 5 , 是基于图 1的本发明回波损耗 [Return Loss]测定图， 按小 型化射频识别标签（100)附着在金属表面的大小测定回波损耗 [Return Loss] 变化的结果。
更详细来说， 提供了小型化射频识别标签（100)附着在金属表面的大小 的变化， 根据附着在金属表面的物质的大小， 本发明的小型化射频识别标 签（100)的回波损耗 [Return Loss]最大时有 2dB的变化。
由此可以知道，在中心频率及回波损耗 [Return Loss]的变化迟钝的问题 上，本发明的小型化射频识别标签（100)与附着在金属表面的物质的大小是 没有关系的。
请参阅图 6 ,是基于图 1的本发明读取范围的测定结果图，是利用具有 28dBm输出的圓偏振天线的 Handheld Reader Antenna (手握式读卡天线） 进行测定的结果。
更详细来说， 小型化射频识别标签（100)并不附着在金属表面来测定读 取范围时有最大 8cm的读取范围， 附着于金属时的金属物质的大小为 20x20mm, 最大为 49cm，60x60mm时体现为最大 56cm的读取范围。
由此可以知道， 上述小型化射频识别标签（100)附着在金属上时， 读取 范围与附着在金属面的物质的大小无关， 不会出现很大的差， 因此， 在脆 弱的金属环境下可以实现各式各样的功用。
如上所述， 参照根据本发明的小型化小型化射频识别标签及其具有的 微带贴片天线的图示为例进行了说明， 上述图纸和发明的详细说明属于预 示性， 所以， 并不会按实施例与图纸来限定本发明。
凡是具有本技术领域的一般知识的人， 就能理解从此可以实现多种变 形及类似的其他实施例。 因此， 可以说本发明在不超越由附加的专利请求 范围提供的本发明的技术性思想或领域的范围内， 能够均等对待的构成要 素的变更都属于本发明的范围。

Claims

权 利 要 求
1. 一种应用在小型化射频识别标签中的微带贴片天线， 其中， 其特征在 于包括： 相互连接的供电部及放射部， 其中， 所述放射部两侧至少具 有一切口。
2. 根据权利要求 1所述的应用在小型化射频识别标签中的微带贴片天 线， 其特征在于， 所述切口为圆形、 椭圆形、 多边形中的一种。
3. 根据权利要求 1所述的应用在小型化射频识别标签中的微带贴片天 线， 其特征在于， 所述放射部为圓形、 椭圓形、 多边形中的一种。
4. 根据权利要求 1或 3所述的应用在小型化射频识别标签中的微带贴片 天线， 其特征在于， 所述放射部和供电部是由银制成。
5. 一种小型化射频识别标签， 其特征在于包括： 芯片、 电介质、 及微带 贴片天线， 其中， 所述微带贴片天线是附着在所述电介质的表面， 所 述微带贴片天线包括相互连接的供电部及放射部， 所述供电部与所述 芯片通过微带线连接。
6. 根据权利要求 5所述的小型化射频识别标签， 其特征在于， 所述芯片 周边具有根据所述芯片的高度而设置的保护涂层。
7. 根据权利要求 6所述的小型化射频识别标签， 其特征在于， 所述保护 涂层为陶瓷、 或橡胶。
8. 根据权利要求 5所述的小型化射频识别标签， 其特征在于， 所述电介 质为陶瓷。
9. 根据权利要求 5所述的小型化射频识别标签， 其特征在于， 所述微带 贴片天线还包括具有连接部的接地层， 所述供电部和放射部是设置在 与所述接地层相对的一面， 且所述供电部与所述连接部将所述芯片连 接在与所述微带贴片天线同一面上、 或与所述接地层同一面上、 或所 述微带贴片天线和接地层连接的一个侧面上。
10.根据权利要求 5或 9所述的小型化射频识别标签， 其特征在于， 所述 微带贴片天线是由银制成。
1 1.根据权利要求 5所述的小型化射频识别标签， 其特征在于， 所述供电 部两侧与所述放射部之间具有间隔。
12.根据权利要求 5所述的小型化射频识别标签， 其特征在于， 所述放射 部为圆形、 椭圆形、 多边形中的一种。
13.根据权利要求 5、 9、 1 1、 12中的任一所述的小型化射频识别标签， 其 特征在于， 所述放射部两侧至少具有一切口。
根据权利要求 13所述的小型化射频识别标签， 其特征在于， 所述切口 为圓形、 椭圆形、 多边形中的一种。
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