EP2223385B1 - Antenne plane à large bande - Google Patents

Antenne plane à large bande Download PDF

Info

Publication number
EP2223385B1
EP2223385B1 EP07856804.5A EP07856804A EP2223385B1 EP 2223385 B1 EP2223385 B1 EP 2223385B1 EP 07856804 A EP07856804 A EP 07856804A EP 2223385 B1 EP2223385 B1 EP 2223385B1
Authority
EP
European Patent Office
Prior art keywords
antenna element
planar
antenna
radiation element
feed points
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP07856804.5A
Other languages
German (de)
English (en)
Other versions
EP2223385A1 (fr
Inventor
Gerhard RÖTTER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2223385A1 publication Critical patent/EP2223385A1/fr
Application granted granted Critical
Publication of EP2223385B1 publication Critical patent/EP2223385B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/106—Microstrip slot antennas

Definitions

  • the invention relates to a planar antenna having a surface-trained inner radiation element, which is surrounded by an outer radiation element, wherein the inner and the outer radiation element each having a feed point.
  • Such an antenna is in the EP 1 437 792 B1 disclosed as part of a cavity slot antenna for automobiles.
  • the inner radiation element has a hexagonal shape. It is surrounded by a square-shaped surface element, which serves as a ground conductor.
  • From the EP 1 513 224 A1 is another known planar antenna.
  • This has a radiating element with an approximately square basic shape, wherein, however, are milled off two opposite corners of the square basic shape. This has the consequence that the two orthogonal successive diagonals of the approximately square basic shape have different lengths.
  • terminal contact points for the radiating element and the grounding surface are present. These are placed opposite each other on two side edges of the radiating element and ground surface outside the diagonal.
  • the wideband as possible implementation of a coplanar antenna structure is required.
  • Read and write devices for UHF transponders in the frequency range from currently 865 MHz to 960 MHz may only operate in a certain frequency range, depending on the country's approval regulations, where the system is used. Objects that are to be identified with transponders are often used across borders. Therefore, transponders with a recognition range in a large frequency range of importance. Large detection ranges are only possible if the antenna system of a transponder can supply enough energy to the RFID semiconductor component.
  • the invention is based on the object to provide a planar antenna of the type mentioned above, which allows broadband operation.
  • the object is achieved in that between the inner radiation element and the outer radiation element is a continuous or discontinuous change in the distance, which is similar with respect to an axis of symmetry of the inner radiation element, and wherein the distance of the outer to the inner radiation element in the region of the two feed points different in the area facing away from the feeding points.
  • the antenna By this embodiment of the antenna, a continuous transformation of the impedance at the feed point to the characteristic impedance of the free space is achieved.
  • the continuous transformation results in a nearly constant radiation behavior in the operating frequency range.
  • the outer radiation element can also be opened in the area facing away from the feed points.
  • the inner radiation element of the antenna according to the invention is in the form of an isosceles triangle.
  • a radiation element which is inhomogeneous in the sense of conduction theory is obtained.
  • the edges can also run exponentially.
  • FIG. 1 is in the middle of the base of the triangular inner radiation element 2, a first feed point 4 and this opposite on the formed as a loop outer radiation element 3, a second feed point 5 is provided.
  • FIG. 2 is the tip of the triangular inner radiation element with the feed point 4 directly opposite the feed point 5 of the outer radiation element 3.
  • the illustrated triangular, inner radiation element 2 is in the sense of line theory an inhomogeneous radiation element whose legs may not necessarily be continuous but also discontinuous as in FIG. 3 shown.
  • the here completely filled surface of the inner radiation element 2 can also be a recess 6 different shape as in the Figures 4,5,6 represented, for example, a slot, for example.
  • the complex impedance and radiation behavior of an antenna is constant within a frequency range.
  • changes in the complex impedance occur as a function of the frequency. The smaller these changes in the given frequency range, the more broadband this execution can be called.
  • This property can be achieved by self-similar or self-complementary geometric structures. Self-similar structures show similar or comparable properties when magnified as in the initial state.
  • the similarity of the inner radiation element 2 is meant with the recess, which results from the boundary with the outer closed or partially closed, rectangular loop. The loop must be closed or continuous in the region of the inner radiation element 2.
  • the extent of the largest dimension of the inner radiation element 2 is in the range of the quarter wavelength of the operating frequency.
  • the dashed shown connected to the feed points 4,5 transformation network 8 is optional, that is, with suitable semiconductor impedance, the connection without concentrated elements is possible.
  • the positioning of the two feed points 4,5 is crucial.
  • the practical embodiment requires the placement of the RFID chip 7 between the illustrated feed points 4, 5, since bonding wires establish the electrical connection between the RFID chip and the antenna 1.
  • the geometrically minimal distance is to be realized for the connection of the outer radiation element 3 to the RFID chip and from this to the planar inner radiation element 2.
  • the connections are to be made in the vicinity of the symmetry line.
  • the positioning of the RFID chip and its connections to the radiation elements 2, 3 at locations where the geometrically minimum distance also results is possible for the impedance matching.
  • the geometrically minimal distance of the connection to the radiation elements 2, 3 is likewise advantageous.
  • RFID semiconductors exhibit lossy capacitive impedance behavior between their connection ports.
  • the antenna 1 shows between those feed points 4,5 a complex impedance in the inductive range.
  • capacitive and inductive components cancel each other out in the best case. If the inductive component of the antenna 1 should not be sufficient for complete compensation, the addition of corresponding proportions by a concentrated component or a power element with a corresponding required inductive content is possible.
  • the outer radiation element 3, in this case the loop is continuous in the area of the feed points 4, 5, that is to say it is closed.
  • the inner 2 and outer radiation element 3 need not necessarily be on one level. However, this is advantageous for the practical implementation.
  • the antenna 1 according to the invention may be applied to a non-conductive support and opposed to a metal surface. With the inventively designed antenna 1 then results in a change in impedance between the feed points 4,5, but to a lesser extent, as in a dipole antenna with comparable dimensions.

Landscapes

  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)

Claims (8)

  1. Antenne ( 1 ) plane ayant un élément ( 2 ) de rayonnement intérieur en deux dimensions qui est entouré d'un élément ( 3 ) de rayonnement extérieur, l'élément intérieur ( 2 ) et l'élément extérieur ( 3 ) de rayonnement ayant respectivement un point ( 4, 5 ) d'alimentation.
    dans laquelle
    a ) il y a, entre l'élément ( 2 ) intérieur de rayonnement et l'élément ( 3 ) extérieur de rayonnement, une variation continue ou discontinue de la distance et celle-ci similaire est par rapport à un axe de symétrie de l'élément ( 2 ) de rayonnement intérieur.
    b ) la distance de l'élément ( 3 ) de rayonnement extérieur à l'élément ( 2 ) de rayonnement intérieur est différente dans la région des deux points ( 4, 5 ) d'alimentation de celle dans la région éloignée des deux points ( 4, 5 ) d'alimentation et
    c ) les points ( 4, 5 ) d'alimentation sont placés aux environs de l'axe de symétrie de l'élément ( 2 ) de rayonnement intérieur,
    caractérisée en ce que l'élément ( 2 ) de rayonnement intérieur est constitué sous la forme d'un triangle isocèle.
  2. Antenne plane suivant la revendication 1,
    caractérisée en ce que l'élément ( 2 ) intérieur de rayonnement et l'élément ( 3 ) extérieur de rayonnement sont dans le même plan.
  3. Antenne plane suivant l'une des revendications précédentes,
    caractérisée en ce que l'élément ( 2 ) de rayonnement a un évidement ( 6 ).
  4. Antenne plane suivant 1"une des revendications précédentes,
    caractérisée en ce que l'évidement ( 6 ) est réalisé sous la forme d'une fente.
  5. Antenne plane suivant l'une des revendications précédentes,
    caractérisée en ce que l'étendue longitudinale de l'élément ( 2 ) de rayonnement intérieur est dans la plage du quart de la longueur d'onde de la fréquence de fonctionnement.
  6. Antenne plane suivant l'une des revendications précédentes,
    caractérisée par l'utilisation dans un transpondeur RFID.
  7. Antenne plane suivant l'une des revendications précédentes,
    caractérisée en ce que l'élément ( 3 ) de rayonnement extérieur est constitué sous la forme d'une boucle.
  8. Antenne plane suivant l'une des revendications précédentes,
    caractérisée en ce que l'élément ( 3 ) de rayonnement extérieur sert de système de conducteur de retour.
EP07856804.5A 2007-12-17 2007-12-17 Antenne plane à large bande Not-in-force EP2223385B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/011068 WO2009076986A1 (fr) 2007-12-17 2007-12-17 Antenne plane à large bande

Publications (2)

Publication Number Publication Date
EP2223385A1 EP2223385A1 (fr) 2010-09-01
EP2223385B1 true EP2223385B1 (fr) 2015-10-28

Family

ID=39769452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856804.5A Not-in-force EP2223385B1 (fr) 2007-12-17 2007-12-17 Antenne plane à large bande

Country Status (4)

Country Link
US (1) US8542150B2 (fr)
EP (1) EP2223385B1 (fr)
CN (1) CN101904053B (fr)
WO (1) WO2009076986A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2984493B1 (fr) * 2011-12-14 2013-12-27 Centre Nat Rech Scient Dispositif de mesure de l'etat de polarisation d'une onde incidente de frequence de 10 ghz a 30 thz
TWI462023B (zh) * 2012-02-08 2014-11-21 Favite Inc 可耦合金屬的電子標籤(tag)
DE102012107291B4 (de) * 2012-08-08 2020-02-13 HARTING Stiftung & Co. KG RFID-Tag mit polarisationsunabhängiger Antenne
JP6789759B2 (ja) * 2016-10-28 2020-11-25 株式会社Ｎｔｔドコモ 円偏波アンテナ
CN112768924B (zh) * 2020-12-31 2022-03-15 厦门大学 渐变多阶矩形密堆积拓频准自补天线

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08148921A (ja) 1994-11-21 1996-06-07 Nippon Sheet Glass Co Ltd 自動車電話用ガラスアンテナ装置
US6914573B1 (en) * 2000-08-07 2005-07-05 Freescale Semiconductor, Inc. Electrically small planar UWB antenna apparatus and related system
JP2002252520A (ja) 2001-02-22 2002-09-06 Asahi Glass Co Ltd 平面アンテナ
JPWO2003105278A1 (ja) * 2002-06-11 2005-10-13 日本板硝子株式会社 平面アンテナおよびその設計方法
JP2004214821A (ja) * 2002-12-27 2004-07-29 Honda Motor Co Ltd 車載アンテナ
JP2004214819A (ja) 2002-12-27 2004-07-29 Honda Motor Co Ltd 車載アンテナ
CN100589277C (zh) * 2003-03-19 2010-02-10 中央硝子株式会社 车用天线
JP4057560B2 (ja) * 2004-06-25 2008-03-05 アルプス電気株式会社 アンテナ装置
JP4315938B2 (ja) * 2004-11-30 2009-08-19 本田技研工業株式会社 車両用アンテナ装置の給電構造および車両用アンテナ装置

Also Published As

Publication number Publication date
US8542150B2 (en) 2013-09-24
US20110057845A1 (en) 2011-03-10
CN101904053B (zh) 2013-06-12
EP2223385A1 (fr) 2010-09-01
WO2009076986A1 (fr) 2009-06-25
CN101904053A (zh) 2010-12-01

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