EP1993167A1 - Antenne für ein RFID-Etikett - Google Patents
Antenne für ein RFID-Etikett Download PDFInfo
- 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- Withdrawn
Links
Images
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)
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)
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)
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 |
-
2007
- 2007-05-16 EP EP07108368A patent/EP1993167A1/de not_active Withdrawn
-
2008
- 2008-05-16 WO PCT/NL2008/050291 patent/WO2008147183A1/en active Application Filing
Patent Citations (3)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7427955B2 (en) | Dual polarization antenna and RFID reader employing the same | |
CA2753206C (en) | Wireless communications including an antenna for wireless power transmission and data communication and associated methods | |
JP5738437B2 (ja) | 移動通信基地局用二重偏波アンテナ及びそれを使用する多重帯域アンテナシステム | |
US7825810B2 (en) | RFID tag read system and method of reading RFID tag | |
JP4437475B2 (ja) | 折り返しダイポールアンテナ及びこれを使用したタグ | |
TWI279024B (en) | Planar antenna | |
CN108352602A (zh) | 超紧凑超宽带双极化基站天线 | |
KR20120072144A (ko) | 넓은 빔 폭을 갖는 원형 편파 안테나 | |
Rahim et al. | UWB monopole antenna with circular polarization | |
WO2013015264A1 (ja) | アンテナ装置 | |
WO2015107983A1 (ja) | アンテナ装置 | |
Narbudowicz et al. | Omnidirectional microstrip patch antenna with reconfigurable pattern and polarisation | |
BRPI1107131A2 (pt) | Sistema de antenas com múltiplos feixes | |
CN105789846A (zh) | 圆极化天线及电子设备 | |
JP2009212727A (ja) | レーダ用アンテナ | |
Feng et al. | A dual‐polarized antenna with low cross polarization, high gain, and isolation for the fifth‐generation array/multiple‐input multiple‐output communications | |
EP2962362B1 (de) | Zirkulär polarisierte antenne | |
CN109066070B (zh) | 一种rfid读写器天线及其使用方法 | |
EP1993167A1 (de) | Antenne für ein RFID-Etikett | |
JP2007142876A (ja) | 偏波共用パッチアンテナ | |
WO2015016349A1 (ja) | アンテナ及びセクタアンテナ | |
CN206134929U (zh) | 小尺寸wifi全向天线及电子设备 | |
JP5149232B2 (ja) | アンテナ装置 | |
KR101481994B1 (ko) | 광대역 복편파 안테나 장치 | |
Sun et al. | Bandwidth enhancement and RCS reduction for a wideband high-gain Fabry-Perot antenna |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
AKX | Designation fees paid | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20090520 |