CN101118985B - Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same - Google Patents

Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same Download PDF

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CN101118985B
CN101118985B CN 200710058346 CN200710058346A CN101118985B CN 101118985 B CN101118985 B CN 101118985B CN 200710058346 CN200710058346 CN 200710058346 CN 200710058346 A CN200710058346 A CN 200710058346A CN 101118985 B CN101118985 B CN 101118985B
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antenna
metal wire
metal
low temperature
shaped
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CN101118985A (en
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张为
曾燕
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天津大学
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Abstract

The invention relates to a low temperature co-firing ceramic antenna and a VHF(very high frequency) radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna. The antenna adopts the low temperature co-firing ceramic as a base plate and adopts metal wire to be printed on the low temperature co-firing ceramic base plate so as to from a needed shape. The VHF radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna comprises an L-shaped grounding metal wire which is printed on the low temperature co-firing ceramic base plate, a spiral micro strip eradiating unit which is connected with the L-shaped grounding metal wire, and a zigzag line shape feed-in metal wire which is connected at the connecting point of the Lshape grounding metal wire and the spiral micro strip eradiating unit. The other end of the zigzag line shape feed in metal wire is the feeding line inputting end; the under layer of the L-shaped grounding metal wire, the spiral micro strip eradiating unit and the zigzag line shape feed in metal wire is provided with an under layer grounding metal plate which adopts the low temperature co-firing ceramic as a base plate; the other end of the L shape grounding metal wire is connected with the under layer grounding metal plate through a through hole between two layers. The present invention reduces the area of the antenna and reduces the wastage, which can realize the whole integration of the RFID label.

Description

由低温共烧陶瓷天线构成的甚高频射频识别标签天线 VHF antenna by the radio frequency identification tag LTCC antenna configuration

技术领域 FIELD

[0001] 本发明涉及一种射频识别标签天线。 [0001] The present invention relates to a radio frequency identification tag antenna. 特别是涉及一种在保证UHF RFID标签性能的情况下,能够大大减小天线面积,提高天线增益,降低损耗,且可通过调整馈入金属线和接地金属线的尺寸,轻易实现与负载阻抗相匹配的由低温共烧陶瓷天线构成的甚高频射频识别标签天线。 Particularly it relates to a case where the RFID tag performance guarantee the UHF, antenna area can be greatly reduced, to improve the antenna gain, reduce the loss, and the size can be fed into the metal wire and the ground wire by adjusting the metal, easy to implement and the load impedance matching VHF antenna by the radio frequency identification tag LTCC antennas.

背景技术 Background technique

[0002] 射频识别(RFID,即Radio Frequency Identification)技术是从上世纪八十年代起走向成熟的一种自动识别技术,它通过射频方式进行非接触双向通信,从而达到识别并交换数据目的。 [0002] Radio frequency identification (the RFID, i.e. Radio Frequency Identification) technology since the early eighties the maturity of an automatic identification technology, which non-contact bidirectional communication by way of radio frequency, so as to achieve the purpose of identification and exchange data. 随着大规模集成电路技术的发展成熟,射频识别系统,特别是射频标签的体积大大减小,因此可应用于更加广阔的领域。 With the development of large scale integrated circuit technology matures, a radio frequency identification system, in particular the volume of the RF tag is greatly reduced, and therefore it can be applied to wider fields.

[0003] RFID标签天线的性能直接影响到系统的整体性能。 [0003] RFID tag antenna performance directly affects the overall system performance. 通常,为了确保接收和发射信号的可靠性,标签天线必须采用全向天线。 Generally, in order to ensure the reliability of receiving and transmitting signals, using the tag antenna to be omni-directional antenna. 此外,天线的实现与应用还受到成本、面积及基底材料特性等因素的限制。 Further, implementation and application of the antenna is also subject to constraints of cost, area and material characteristics of the substrate. 商品化RFID标签一般采用胶片乃至普通纸张等柔性材料作为基底,这样,由于基底材料的介电常数低、损耗高,使得天线的增益和尺寸等指标很难有所突破。 RFID tags typically employed commercial film and the flexible material of plain paper as the substrate, so that, due to the low dielectric constant of the substrate material, high loss, so that the gain index and size of the antenna is difficult to achieve a breakthrough. 现有UHF RFID标签天线的增益通常小于I. 8,面积约等于IC卡面积(8. 5cmX5cm),且制作工艺与半导体集成电路工艺互不兼容,无法实现全集成UHF RFID标签。 Conventional UHF RFID tag antenna gain is generally less than I. 8, an area approximately equal to the area of ​​the IC card (8. 5cmX5cm), and the production process of the semiconductor integrated circuit technology are not compatible, can not achieve a fully integrated UHF RFID tag.

[0004] 在UHF RFID系统中,最常使用的是偶极子天线。 [0004] In the UHF RFID systems, the most commonly used is a dipole antenna. 它的基本结构由两段同样粗细和等长的直导线排布成一条直线构成。 The basic structure of the same thickness and the like by the two long, straight wires arranged in a straight line configuration. 信号从中间的两个端点馈入,在偶极子的两臂上产生一定的电流分布,这种电流分布会在天线周围空间激发电磁场。 Signal, a certain current distribution on the dipole arms from the two end points of the intermediate feed, this current distribution excites an electromagnetic field in space around the antenna. 偶极子天线具有优良的辐射性能,但是天线的尺寸较大,不能满足微型化要求。 Dipole antenna having excellent radiation performance, but the large size of the antenna can not satisfy the requirements of miniaturization. 为了在满足全向性要求的同时减小天线尺寸,可将偶极子天线变形为单极子结构,但由于单极子天线纵向尺寸较大,且阻抗匹配存在一定的难度,所以极少在UHF RFID标签中应用。 In order to reduce antenna size while meeting the requirements of omnidirectional, dipole antenna may be deformed into a monopole structure, but due to the large longitudinal dimension monopoles, and there is a certain degree of difficulty of impedance matching, so little in UHF RFID tag application.

[0005] 现有UHF频段的单极天线多采用倒F结构,它是由L型单极天线演变而来的。 [0005] UHF band monopole antenna prior to use more inverted-F structure that is evolved from the evolution of the L-shaped monopole antenna. L型单极天线是将单极天线折成L的形状,其优点在于可以减小天线的高度。 L-monopole antenna is folded monopole antenna L shape, which is advantageous in that the height of the antenna can be reduced. 但其负载阻抗较低,匹配存在一定难度。 But its low impedance load, there is a certain difficulty matching. 因此,为了增加整体天线的输入阻抗,在L型单极天线垂直部分的尾端再加上一个L形,同时将尾端接地,即形成倒F结构。 Accordingly, in order to increase the overall input impedance of the antenna, at the end of the vertical L-shaped monopole antenna portion coupled with an L-shaped, while the trailing end of the ground, i.e., an inverted-F structure is formed.

[0006] 图I是印刷倒F天线结构示意图。 [0006] FIG. I is a schematic view of a printed inverted F antenna structures. 目前倒F天线通常印刷在PCB基板上,但若将其制作在胶片和普通纸张等低介电常数、高损耗的基底上用于915MHz UHF RFID标签,则由于其长度约为共振频率的四分之一波长,面积难以进一步减小。 Currently generally inverted-F antenna printed on the PCB substrate, but if it is used for making labels on 915MHz UHF RFID low dielectric constant film substrate and the like plain paper, high loss, since a length of about a quarter of the resonance frequency one of the wavelengths, it is difficult to further reduce the area.

[0007] LTCC技术采用多层基板通过低温共烧形成高密度三维集成电路,不仅可方便地将电阻、电容、电感等无源元件埋置在三维结构中,而且具有高频高Q值特性、可适应大电流及耐高温应用要求等优点。 [0007] LTCC technology uses a high-density multilayer substrate is formed by low-temperature co-fired dimensional integrated circuit, not only may conveniently be resistors, capacitors, inductors and other passive components embedded in the three-dimensional structure, and a high Q value having a characteristic frequency, Great advantages can be adapted to current requirements and high temperature applications. 与胶片和纸张等材料相比,LTCC基板材料的介电常数高,损耗低,温度稳定性好,有利于高性能天线的制备,同时解决了UHF RFID标签天线性能与面积之间的矛盾,并为实现全集成UHF RFID标签奠定了坚实的基础,使得RFID技术可应用于更加广阔的领域。 Compared to materials such as paper and film, high dielectric constant material LTCC substrate, low loss, good temperature stability, facilitate the preparation of high-performance antenna also solves the contradiction between the UHF RFID tag antenna performance and area, and It laid a solid foundation for the realization of a fully integrated UHF RFID tag, so that RFID technology can be applied to broader areas. 发明内容 SUMMARY

[0008] 本发明所要解决的技术问题是,提供一种在保证UHF RFID标签性能的情况下,能够大大减小天线面积,提高天线增益,降低损耗,且可通过调整馈入金属线和接地金属线的尺寸,轻易实现与负载阻抗相匹配的由低温共烧陶瓷天线构成的甚高频射频识别标签天线。 [0008] The present invention solves the technical problem, in the case to provide a guaranteed performance UHF RFID tag, the antenna area can be greatly reduced, to improve the antenna gain, reduce the loss, and can be fed into the metal wire and the ground by adjusting the metal dimension line, easily achieved with the load impedance to match the co-firing VHF radio frequency identification tag antenna composed of a low-temperature ceramic antennas.

[0009] 本发明所采用的技术方案是:一种由低温共烧陶瓷天线构成的甚高频射频识别标签天线,包括有:L形接地金属线;与L形接地金属线连接的螺旋形微带辐射单元;连接在L形接地金属线与螺旋形微带辐射单元的连接点处的曲折线形馈入金属线,所述的曲折线形馈入金属线的另一端为馈线输入端;所述的L形接地金属线、螺旋形微带辐射单元、曲折线形馈入金属线均印刷在由低温共烧陶瓷构成的基板上;在L形接地金属线、螺旋形微带辐射单元、曲折线形馈入金属线的基板下层还设置有由低温共烧陶瓷和接地金属共同构成的下层接地金属板,其中的低温共烧陶瓷作为基板,接地金属印刷在低温共烧陶瓷基板上;在L形接地金属线的另一端通过两层之间的通孔与下层接地金属板相连接。 [0009] The technical proposal of the present invention is: A VHF low-temperature co-fired ceramic RFID tag antenna composed of an antenna, comprising: an L-shaped grounding metal wire; micro-helical L-shaped ground connected to the metal lines band radiating element; meander line is connected to the connection point of the L-shaped ground metal wire spiral microstrip radiating elements feeding the metal wire, the other end of the meander line feeding the metal wire is input feeder; the L-shaped ground metal wire, spiral microstrip radiating elements, meander line feeding the metal wires are printed on a LTCC substrate constituting; the L-shaped ground metal wire, spiral microstrip radiating elements, meander line feed a substrate underlying the metal wire is further provided with a low-temperature co-fired lower ground plate of ceramic and the ground metal together form, wherein the low-temperature co-fired ceramic as the substrate, a ground metal printing in a low temperature co-fired ceramic substrate; L-shaped ground metal line the other end is connected to ground by vias to the underlying metal sheet between two layers.

[0010] 所述的下层接地金属板上印刷的接地金属覆盖螺旋形微带辐射单元以下直至馈线输入端的面积。 The lower grounded metal plate of the [0010] printed metal ground coverage area of ​​microstrip spiral radiating element until the input feeder.

[0011] 本发明的由低温共烧陶瓷天线构成的甚高频射频识别标签天线,采用LTCC技术实现了一种改进结构的UHF RFID标签天线,在保证UHF RFID标签性能的情况下,大大减小了天线面积(比现有PCB印刷倒F天线减小70% ),提高了天线增益(约为3. I),降低了损耗,且可通过调整馈入金属线和接地金属线的尺寸轻易实现与负载阻抗相匹配。 [0011] VHF antenna by the radio frequency identification tag LTCC antennas of the present invention, using a LTCC technology improved UHF RFID tag antenna structure, in the case of guaranteed performance UHF RFID tags, greatly reduced the antenna area (than the conventional inverted F antenna printed PCB 70% reduction), increased antenna gain (about 3. I), loss is reduced, and the size can be fed into the metal wire and the metal wire is grounded easily achieved by adjusting to match the load impedance. 采用LTCC基天线还可实现RFID标签的全集成化。 LTCC substrate antenna can also be implemented using fully integrated RFID tag.

附图说明 BRIEF DESCRIPTION

[0012] 图I是现有技术的PCB印刷倒F天线结构示意图; [0012] FIG. I is a schematic view of prior art PCB printed inverted F antenna structure;

[0013] 图2是本发明的基于低温共烧陶瓷技术的甚高频射频识别标签天线的结构示意图。 [0013] FIG. 2 is a schematic view based on LTCC technology VHF radio frequency identification tag antenna according to the present invention.

[0014]其中: [0014] wherein:

[0015] I :L形接地金属线 2 :两层之间的通孔 [0015] I: L-shaped ground metal line 2: through-hole between the two layers

[0016] 3:曲折线形馈入金属线4:下层接地金属板 [0016] 3: meander line feeding the metal wire 4: the lower ground plate

[0017] 5:馈线输入端 6:螺旋形微带辐射单元 [0017] 5: input feeder 6: spiral microstrip radiating elements

具体实施方式 Detailed ways

[0018] 下面结合实施例对本发明的由低温共烧陶瓷天线构成的甚高频射频识别标签天线做出详细说明。 [0018] The following detailed description made in conjunction with embodiments of the VHF radio frequency identification tag antenna by the LTCC antennas of the present invention.

[0019] 本发明的低温共烧陶瓷天线,包括有低温共烧陶瓷和金属线,所述的低温共烧陶瓷构成金属线的基板,金属线印刷在低温共烧陶瓷基板上一起共同构成所需形状的天线。 [0019] The present invention is a low temperature co-fired ceramic antenna, including LTCC and the wire, the LTCC substrate constituting the metal wire, the wire in printing on low temperature cofired ceramics substrate together constitute the desired shape of the antenna.

[0020] 所述的金属线与构成基板的低温共烧陶瓷可以共同构成任意所需的形状。 [0020] The low metal wire constituting said co-fired ceramic substrate may constitute any desired shape. 如共同构成L形结构的天线,或曲折线形结构的天线,或螺旋线形结构的天线等。 The antenna together form an L-shaped structure, or a meander line antenna structure, the antenna, or the like helical structure.

[0021] 如图2所示,本发明的由低温共烧陶瓷天线构成的甚高频射频识别标签天线,包括有:L形接地金属线I ;与L形接地金属线I连接的螺旋形微带辐射单元6 ;连接在L形接地金属线I与螺旋形微带辐射单元6的连接点处的曲折线形馈入金属线3,所述的曲折线形馈入金属线3的另一端为馈线输入端5 ;所述的L形接地金属线I、螺旋形微带辐射单元6、曲折线形馈入金属线3均印刷在由低温共烧陶瓷构成的基板上;在L形接地金属线I、螺旋形微带辐射单元6、曲折线形馈入金属线3的基板下层还设置有由低温共烧陶瓷和接地金属共同构成的下层接地金属板4,其中的低温共烧陶瓷作为基板,接地金属印刷在低温共烧陶瓷基板上,所述下层接地金属板4上的接地金属覆盖螺旋形微带辐射单元6以下直至馈线输入端5的面积;在L形接地金属线I的另一端通过两层之间的通孔2与下层 [0021] As shown, the LTCC antennas VHF antenna 2 radio frequency identification tag of the present invention, comprising: L-shaped ground metal line I; micro-helical L-shaped ground and connected to the metal line I 6 with a radiating element; L is connected with the line I-shaped ground metal spiral meander line microstrip radiating element is connected at a point 6 the metal wire 3 feeding said meander line feeding the other end of the metal wire 3 is input feeder end 5; said L-shaped ground metal line I, spiral microstrip radiating elements 6, meander line feeding the wires 3 are printed on the LTCC substrate constituting; the L-shaped ground metal line I, the coil shaped radiating element 6 microstrip, meander line metal line feeding the lower substrate 3 is also provided with a low-temperature co-fired ceramic and a lower ground plate together constitute a ground metal 4, wherein the LTCC substrate as the ground metal printing LTCC ceramic substrate, a metal ground on the metal plate 4 to cover the lower ground spiral radiating element microstrip feed line 6 until the end of the input area 5; L-shaped ground at the other end between the two layers of metal through the line I through hole 2 and the lower layer 接地金属板4相连接。 4 is connected to a grounded metal plate.

[0022] 在本发明的实施例中,是采用LTCC(低温共烧陶瓷)技术制作用于915MHz UHFRFID标签的天线,两层LTCC基板,每层基板的厚度为0. 12mm。 [0022] In an embodiment of the present invention, is the use of LTCC (low temperature cofired ceramics) technology for the production of a tag antenna 915MHz UHFRFID, two LTCC substrate, the thickness of each substrate is 0. 12mm. 上层基板印刷的微带金属线线宽均为0. 2_。 Metal upper substrate printed microstrip line width are 0. 2_. 下层基板印刷接地金属,金属要覆盖辐射单元以下直至馈入端。 Lower printing grounded metal substrate, a metal cover to the radiating unit until feeding terminal. 在LTCC三维集成电路中,可直接利用隔离天线和其它元件之间的金属板作为天线的接地金属板。 In LTCC three dimensional integrated circuit, the metal plate may be directly between the separator and the other antenna elements as an antenna ground plate. 因此可在不影响天线性能的情况下,尽量减小金属板的尺寸。 May thus without affecting the antenna performance, to minimize the size of the metal plate. 在本发明的实施例中用于L形接地金属线与接地金属板之间连接的通孔的直径为0. 15mm。 The diameter of a through-hole L-shaped ground connection between the metal line and the ground metal plate in the embodiment of the present invention is 0. 15mm.

[0023] 本发明所使用的LTCC材料(Ferro A6_M)的介电常数为5. 9±0. 3,比柔性衬底的介电常数(2〜3)大。 [0023] LTCC dielectric constant material (Ferro A6_M) used in the present invention is to 5. 9 ± 0. 3, larger than the dielectric constant of the flexible substrate (2 or 3). 由于天线长度与介质中的波长成正比,所以增大介电常数可有效地减小天线面积。 Since the length of the antenna is proportional to the wavelength of the medium, it can effectively reduce the dielectric constant increases the area of ​​the antenna. 为了进一步减小天线长度,将天线做成螺旋线结构,馈线变形为曲折线结构,这种变形虽然会使得天线的频带中点发生偏移,但是通过调整L形接地金属线和馈线的长度可轻易地将频带中心调整到所希望的位置。 To further reduce the length of the antenna, the antenna made of helix structure, the midpoint of the band feeder structure is deformed into a zigzag line, although it will deform so that the antenna is offset, but by adjusting a grounded metal wire length L and the feeder can be shaped band center easily adjusted to the desired position. 本发明的实施例中采用银作为金属导体,使得制作出来的天线具有较高的品质因数。 Embodiments of the present invention, the silver as the metal conductor, so that the antenna has produced the higher quality factor. 此外,还可进一步将RFID标签芯片置入LTCC基板中,实现全集成UHF RFID标签。 Further, the RFID tag may further LTCC substrate into chips, to achieve a fully integrated UHF RFID tag.

Claims (2)

1. 一种由低温共烧陶瓷天线构成的甚高频射频识别标签天线,其特征在于,包括有:L形接地金属线(I);与L形接地金属线(I)连接的螺旋形微带辐射单元¢);连接在L形接地金属线(I)与螺旋形微带辐射单元(6)的连接点处的曲折线形馈入金属线(3),所述的曲折线形馈入金属线(3)的另一端为馈线输入端(5);所述的L形接地金属线(I)、螺旋形微带辐射单元¢)、曲折线形馈入金属线(3)均印刷在由低温共烧陶瓷构成的基板上;在1形接地金属线(I)、螺旋形微带辐射单元¢)、曲折线形馈入金属线(3)的基板下层还设置有由低温共烧陶瓷和接地金属共同构成的下层接地金属板(4),其中的低温共烧陶瓷作为基板,接地金属印刷在低温共烧陶瓷基板上;在1形接地金属线(I)的另一端通过两层之间的通孔(2)与下层接地金属板(4)相连接。 A co-fired VHF radio frequency identification tag antenna composed of a low-temperature ceramic antennas, characterized in that, comprising: L-shaped ground metal line (I); and L-shaped ground metal line (I) connected to the micro-helical band radiating elements ¢); L-shaped ground connection metal line (I) and a spiral microstrip radiating elements at the connection point (6) of the meander line feeding the metal wire (3), the meander line metal line feed (3) the other end of the feeder is input (5); said L-shaped ground metal line (I), spiral microstrip radiating elements ¢), meander line feeding the metal wire (3) are printed on a low-temperature co sintered ceramic substrate; a metal in the 1-shaped ground wire (I), spiral microstrip radiating elements ¢), meander line feeding the metal wire (3) is also provided with the lower substrate by a low-temperature co-fired ceramic and a common grounded metal the lower grounded metal plate (4), wherein the LTCC substrate as the ground metal printing in a low temperature cofired ceramic substrate; and the other end shaped in a grounded metal wire (I) through the through hole between the two layers (2) and the lower ground plate (4) is connected.
2.根据权利要求I所述的由低温共烧陶瓷天线构成的甚高频射频识别标签天线,其特征在于,所述的下层接地金属板(4)上印刷的接地金属覆盖螺旋形微带辐射单元¢)以下直至馈线输入端(5)的面积。 The I by the VHF low temperature cofired ceramic RFID tag antenna composed of the antenna, characterized in that the print (4) the lower ground plate grounded metal cover spiral microstrip radiation as claimed in claim ¢ unit area) until the input feeder (5).
CN 200710058346 2007-07-20 2007-07-20 Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same CN101118985B (en)

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CN101546862B (en) 2008-03-28 2012-06-20 鸿富锦精密工业(深圳)有限公司 Micro-strip antenna
CN101350447B (en) 2008-07-05 2012-08-22 中山达华智能科技股份有限公司 Line-imbedding type UHF frequency band line-establishing antennae and UHF electronic label using the same
CN101707284B (en) * 2009-11-20 2013-01-09 电子科技大学 LTCC electrically small integrated antenna for radio-frequency front-end system
CN101950857B (en) * 2010-08-27 2012-12-05 电子科技大学 Chip antenna based on LTCC ceramic medium
CN103515700B (en) * 2013-09-27 2016-01-13 北京邮电大学 A kind of RFID antenna
CN105161855A (en) * 2015-09-28 2015-12-16 江苏大学 433 MHz miniaturization omnidirectional micro-strip antenna and manufacture method

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KR20020013673A (en) 2000-08-14 2002-02-21 우종명 Surface-mounted multi-layered Chip Ceramic Dielectric antenna for PCS Phone

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KR20020013673A (en) 2000-08-14 2002-02-21 우종명 Surface-mounted multi-layered Chip Ceramic Dielectric antenna for PCS Phone

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