EP1993167A1 - Antenne für ein RFID-Etikett - Google Patents

Antenne für ein RFID-Etikett Download PDF

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Publication number
EP1993167A1
EP1993167A1 EP07108368A EP07108368A EP1993167A1 EP 1993167 A1 EP1993167 A1 EP 1993167A1 EP 07108368 A EP07108368 A EP 07108368A EP 07108368 A EP07108368 A EP 07108368A EP 1993167 A1 EP1993167 A1 EP 1993167A1
Authority
EP
European Patent Office
Prior art keywords
antenna
double quad
squares
double
quad
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.)
Withdrawn
Application number
EP07108368A
Other languages
English (en)
French (fr)
Inventor
Johannes Adrianus Cornelis Theeuwes
Gerardus Johannes Nicolaas Doodeman
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP07108368A priority Critical patent/EP1993167A1/de
Priority to PCT/NL2008/050291 priority patent/WO2008147183A1/en
Publication of EP1993167A1 publication Critical patent/EP1993167A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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

Definitions

  • the invention refers to an antenna which bundles an RF signal for the benefit of reading out RFID tags with a narrow bundle.
  • a well-known antenna in literature is a "double quad” or "Doppelquad” antenna.
  • a double quad antenna shown in figure 1 , comprises two mainly closed squares 1 and 2, mainly lying in one antenna plane and constituted by filamentary conductors, each side of which having a length of a quarter of the wavelength at which the antenna has to operate. Both squares meet diagonally, i.e. the diagonals of both squares starting from that meeting point are in line. In a corner where both squares meet, both squares are fed by, as it were, cutting them open there, at the points A and B. When a high frequent source is connected, an electric field will arise in both squares having the same direction as the field between the connection points A and B.
  • a ground plane 3 is provided which shields the power radiated towards the ground plane.
  • a disadvantage of the known antenna is that the near field readability is moderate.
  • the near field is that part of the radiated field nearest to the antenna, where the radiation pattern depends on the distance from the antenna. Beyond the near field is the far field.” ( ⁇ Wikipedia).
  • the invention aims to improve the near field readability of the antenna.
  • the invention preferably provides adding a second double quad antenna, of which the antenna plane is mainly parallel to the antenna plane of the first double quad, and which is rotated a quarter of a turn w.r.t. the first double quad around an imaginary axis perpendicular to both antenna planes and mainly through the respective common vertices or feed points of both double quad antennas.
  • the second double quad antenna has mainly the same dimensions as the first one.
  • the relevant ribs of the squares of the first and second double quad are preferably located at small distance (e.g. 1 to 2 mm) to each other.
  • the quads of the first antenna and those of the second antenna may be located either in the same plane or in different planes.
  • the quads of the first antenna may be located in a first plane and the quads of the second antenna in a second plane, located below or above the first one.
  • the same RF signal source is connected to the points C and D via a delay line, arousing ("passively") an electric field which is, however, perpendicular to the first field.
  • the operation of the second double quad is equal to the operation of the first one.
  • a delay time which provides 90 degrees phase shift arouses a circularly polarized field aroused by the four quad antennas. By varying the delay time the radiation diagram may be adapted to oval polarization.
  • Electrical coupling between the two orthogonally located double quad antennas can be provided via a plane below the (preferably common) antenna plane of the quads.
  • each double quad acting as a passive radiator of the other one, results in good near field bundling, due to which this combination is very well fit for short distance reading of e.g. RFID tags.
  • the antenna shown in figure 2 consists of two double quad antennas, each consisting of two mainly closed squares 1, 2 and 3, 4 respectively, mainly located in one antenna plane and formed by filamentary conductors.
  • the sides of each quad have a length of a quarter of the operational wavelength of the antenna.
  • Both squares of antenna 1-2 are fed via the nodes A and B; the squares of antenna 3-4 are fed via the nodes C and D.
  • Connected to an RF source an electric field arises in the squares 1 and 2, the direction of which is indicated by the arrows I.
  • the squares 3 and 4 are fed via the nodes C and D; the resulting electric field has a direction which is indicated by the arrows II.
  • the directions I and II are transverse to each other.
  • this configuration comprises a base 3 which screens the radiated power in the direction of that base.
  • the antenna plane of the second double quad antenna 3-4 - the (in this case) common plane through the quads 3 and 4 - is mainly parallel to the antenna plane - the (in this case) common plane through the quads 1 and 2 - of the first double quad, while the second double quad antenna is rotated a quarter of a turn with respect to the first double quad around an imaginary axis perpendicular to both antenna planes and mainly through the respective feed points (or common vertices) of both double quad antennas.
  • the second double quad antenna mainly has the same dimensions as the first one; however, different dimensions may be chosen.
  • the ribs of the squares of the first and second double quad preferably are located at a small distance (e.g. 1 to 2 mm) from each other. In the shown exemplary embodiment (somewhat) below each other, because the antenna planes of the quads 1-2 respectively 3-4 are not in the same plane; in the shown exemplary embodiment the plane of the second double quad antenna 3-4 is located below the plane of the first double quad antenna 1-2.
  • the two squares connected to these nodes will arouse an electric field.
  • the added second double quad antenna will come into resonance too because always two sides of a square of the connected first antenna electromagnetically couple with the relevant sides of the second antenna.
  • the second antenna will arouse an equally aligned, i.e. pointing in the same direction, electric field (in figure 2 the arrows I and II would have the same direction).
  • the whole would behave like four quad antennas which together provide bundling of the radiation.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP07108368A 2007-05-16 2007-05-16 Antenne für ein RFID-Etikett Withdrawn EP1993167A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07108368A EP1993167A1 (de) 2007-05-16 2007-05-16 Antenne für ein RFID-Etikett
PCT/NL2008/050291 WO2008147183A1 (en) 2007-05-16 2008-05-16 Antenna for rfid tag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07108368A EP1993167A1 (de) 2007-05-16 2007-05-16 Antenne für ein RFID-Etikett

Publications (1)

Publication Number Publication Date
EP1993167A1 true EP1993167A1 (de) 2008-11-19

Family

ID=38606541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07108368A Withdrawn EP1993167A1 (de) 2007-05-16 2007-05-16 Antenne für ein RFID-Etikett

Country Status (2)

Country Link
EP (1) EP1993167A1 (de)
WO (1) WO2008147183A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110205027A1 (en) * 2008-06-30 2011-08-25 Nederlandse Organisatie voor toegepast- natuurwetenschappelijf onderzoek TNO Radio frequency tag
WO2013091548A1 (zh) * 2011-12-20 2013-06-27 Liu Zhijia 超薄型双频微带贴片天线阵式rfid标签天线

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142292A (en) * 1991-08-05 1992-08-25 Checkpoint Systems, Inc. Coplanar multiple loop antenna for electronic article surveillance systems
DE19603803A1 (de) * 1996-02-02 1997-08-14 Niels Koch Quad-Antenne, gefertigt auf einem isolierenden Material
FR2864354A1 (fr) * 2003-12-17 2005-06-24 Commissariat Energie Atomique Antenne plane a champ tournant, comportant une boucle centrale et des boucles excentrees, et systeme d'identification par radiofrequence

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142292A (en) * 1991-08-05 1992-08-25 Checkpoint Systems, Inc. Coplanar multiple loop antenna for electronic article surveillance systems
DE19603803A1 (de) * 1996-02-02 1997-08-14 Niels Koch Quad-Antenne, gefertigt auf einem isolierenden Material
FR2864354A1 (fr) * 2003-12-17 2005-06-24 Commissariat Energie Atomique Antenne plane a champ tournant, comportant une boucle centrale et des boucles excentrees, et systeme d'identification par radiofrequence

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110205027A1 (en) * 2008-06-30 2011-08-25 Nederlandse Organisatie voor toegepast- natuurwetenschappelijf onderzoek TNO Radio frequency tag
WO2013091548A1 (zh) * 2011-12-20 2013-06-27 Liu Zhijia 超薄型双频微带贴片天线阵式rfid标签天线
US9230207B2 (en) 2011-12-20 2016-01-05 Xerafy Ltd (Bvi) RFID tag aerial with ultra-thin dual-frequency micro strip patch aerial array

Also Published As

Publication number Publication date
WO2008147183A1 (en) 2008-12-04

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