EP2514031B1 - Antenne à encoche - Google Patents

Antenne à encoche Download PDF

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Publication number
EP2514031B1
EP2514031B1 EP10805726.6A EP10805726A EP2514031B1 EP 2514031 B1 EP2514031 B1 EP 2514031B1 EP 10805726 A EP10805726 A EP 10805726A EP 2514031 B1 EP2514031 B1 EP 2514031B1
Authority
EP
European Patent Office
Prior art keywords
notch
plate
antenna
suitably
adjustment portion
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
EP10805726.6A
Other languages
German (de)
English (en)
Other versions
EP2514031A2 (fr
Inventor
Robert James Clements
James Maximillian Todd
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.)
Aerial Research Technology Ltd
Original Assignee
Aerial Research Technology Ltd
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 Aerial Research Technology Ltd filed Critical Aerial Research Technology Ltd
Publication of EP2514031A2 publication Critical patent/EP2514031A2/fr
Application granted granted Critical
Publication of EP2514031B1 publication Critical patent/EP2514031B1/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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
    • 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
    • H01Q13/085—Slot-line radiating ends
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line

Definitions

  • the invention described herein relates to notch antennas, to plate components of notch antennas, and to related manufacturing and installation methods.
  • a conventional notch antenna is shown in Figure 1 .
  • the antenna comprises a plate P with a notch N, the notch N being coupled to feed line F at a feed point.
  • the width W of the plate P is chosen to be less than a quarter of one wavelength.
  • the notch N is doglegged to allow the notch to be of sufficient length.
  • US2004239575 A1 describes a mobile terminal comprising a broad band notch antenna composed of a fed notch and a parasitic notch operating through electromagnetic coupling with the fed notch.
  • the two notches are of different lengths and cut in parallel with from the same edge of a printed circuit board.
  • US5917454 describes a slotted ring-shaped antenna for toroidal radiation in global positioning system comprising a flexible cylindrical copper strip arranged around an electronic package including a driven slot and parasitically driven slots. A copper tape placed over each slot in order to adjust the length thereof such that the slot radiates at the desired frequency.
  • US2002171594 describes a dual band slot antenna having a fed slot and a parasitic slot.
  • EP1148582 describes a slot antenna with parasitic slots used to influence the beam width of the antenna.
  • WO2006/097496 describes a mobile phone comprising a notch antenna with an adjustment component arranged across the notch.
  • US2009/273524 describes an antenna which includes: a plate-like base made of an insulating material; and a conductor in a predetermined shape, which has multiple cut-out portions and which is provided at a predetermined position of the base to obtain predetermined antenna characteristics.
  • the antenna is configured so that the antenna characteristics can be mostly maintained even when the base is deformed into a predetermined curved-surface shape.
  • WO00/69021 describes a concealed antenna system for a vehicle radio communication system which consists of a slot or notch cut in a conductive panel which is adapted to form part of or be fitted to the structure of a vehicle with which the radio communication system is to be used.
  • the antenna In order to produce vertically polarised radiation the antenna is positioned with the slot or notch horizontal and in order to ensure that the antenna operates with a non-resonant feed line matched to the antenna impedance of coaxial cable is connected to the edges of the slot by insulated leads linked to the magnetic field in a portion of the slot.
  • a nonmagnetic electrically conductive element is positioned spanning a part of the slot and insulated therefrom.
  • the second notch is arranged with the first to be excited, in use, by currents induced around the first notch.
  • the first notch comprises an open end at an edge of the plate, a closed end, and long edges between the open and closed ends.
  • the second notch comprises an open end at an edge of the plate, a closed end, and long edges between the open and closed ends.
  • the plate comprises a metallic material.
  • the plate comprises a thin, electrically conducting material.
  • the plate comprises an elastically deformable material.
  • the plate comprises a flexible material.
  • the antenna further comprises a cover arranged over one or both faces of the plate.
  • the cover is electrically non-conductive.
  • the cover is of low electrical permittivity to radio frequency energy within the operating range of the antenna.
  • the cover comprises part of a vehicle registration plate.
  • the plate comprises a component selected from a group including: the ground plane of a circuit-board, metal sheet and expanded metal.
  • the plate has a width, x, dimension, a height, z, dimension and a depth, y, dimension.
  • the depth of the plate is small in comparison to the width and height.
  • the plate is generally rectangular.
  • the width of the plate is equal to or greater than one quarter of one wavelength at the centre of the operating frequency range.
  • the width of the plate is selected according to the desired frequency for the centre of the operating range.
  • the first and second notches open on opposite plate edges.
  • the first notch is generally linear.
  • the second notch is generally linear.
  • the first notch comprises long edges aligned with the width dimension of the plate.
  • the second notch comprises long edges aligned with the width dimension of the plate.
  • the first notch is of length less than or equal to one fifth of one wavelength at the centre of the operating frequency range.
  • the second notch is of length less than one fifth of one wavelength at the centre of the operating frequency range.
  • the length of the first and/or second notch is selected with a length according to the desired frequency for the centre of the operating range.
  • the notch antenna comprises an adjustment portion provided to the second notch to facilitate change to the effective length of the second notch.
  • the adjustment portion comprises a conductive patch applied to the second notch, suitably applied across the second notch.
  • the adjustment portion is applied at the closed end of the second notch.
  • the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
  • the adjustment portion is arranged to bridge the second notch with a conducing element in contact with the plate.
  • the adjustment portion is arranged to provide a conductor that is capacitively coupled to the plate.
  • the adjustment portion comprises an semiconductor component coupled across the second notch.
  • the adjustment portion comprises a switching component coupled across the second notch.
  • the adjustment portion comprises a PIN diode coupled across the second notch.
  • the adjustment portion comprises a plurality of like or unlike components, including one or more selected from the adjustment portions described above.
  • the feed line comprises a coaxial feed line.
  • the feed line comprises a microstrip connection across the first notch.
  • the antenna comprises a sealed body provided around the plate.
  • the sealed body is an insulating body.
  • the adjustment portion is provided outside the sealed body.
  • the first and second notches are manufactured with different lengths.
  • the second notch is longer than the first notch.
  • the adjustment portion shortens the effective length of the second notch.
  • the method of manufacturing a notch antenna comprising the steps of: providing a first notch coupled to a feed line, and providing a second notch in use to be passively excited by a signal supplied to the first notch through the feed line.
  • the method further comprises providing an adjustment portion for the second notch to change the effective length of the second notch.
  • the method further comprises providing an adjustment portion in the form of a conductive patch applied to the second notch, suitably applied across the second notch.
  • the adjustment portion is applied at the closed end of the second notch.
  • the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
  • the method further comprises providing an adjustment portion in the form of a semiconductor component coupled across the second notch.
  • the adjustment portion comprises a switching component coupled across the second notch.
  • the adjustment portion comprises a PIN diode coupled across the second notch.
  • the adjustment portion comprises a plurality of like or unlike components, including one or more selected from the adjustment portions described above.
  • the method comprising installing the antenna at a desired installation position, and providing an adjustment portion for the second notch to change the effective length of the second notch in response to a detected frequency shift from a desired centre frequency caused by electrical permittivity of the installation position.
  • providing the adjustment portion comprises providing a conductive patch applied to the second notch, suitably applied across the second notch.
  • the adjustment portion is applied at the closed end of the second notch.
  • the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
  • the antenna 10 comprises a plate 20, first and second notches 21,22 and a feed line 30.
  • the feed line 30 may be fed directly, or alternatively via a BALUN.
  • the first notch 21 is operatively coupled to the feed line 30 at a feed point to receive a signal from the feed line 30 when the antenna 10 is used to transmit. Reciprocity applies when the antenna 10 is used to receive.
  • the second notch 22 is in use passively excited by a signal supplied to the first notch 21 through the feed line 30, or by induced currents in the plate for the receive condition.
  • the feed line 30 is suitably a coaxial line.
  • the plate 20 is generally planar, and generally rectangular with characteristic dimensions of width x, height z, and out of plane depth y, that is an out of plane depth y that is orthogonal to the plane of the paper.
  • the depth of the plate 20 is small in comparison to the width and height.
  • the first and second notches 21,22 are provided in the plate 20 close to one another such that the second notch 22 is excited, in use, by currents induced around the first notch 21 in response to a signal applied to the first notch 21 from the feed line 30, or by induced plate currents in the case or reception.
  • the first notch 21 comprises an open end 211 at an edge of the plate, a closed end 212, and long edges 213 between the open and closed ends 211,212.
  • the second notch 22 comprises an open end 221 at an edge of the plate, a closed end 222, and long edges 223 between the open and closed ends 221,222.
  • the long edges 213,223 are linear, and are aligned with the width of the plate 20.
  • the open ends 211,221 of the first and second notches 21,22 are located on opposing plate edges.
  • the width of the plate 20 is greater than one quarter of one wavelength at the centre of the operating frequency range.
  • the first and second notches 21,22 are of length less than one fifth of one wavelength at the centre of the operating frequency range.
  • the plate 20 comprises a metallic material which in example embodiments may be flexible to allow the antenna 10 to be bent out of planar arrangement around a substrate to which it is to be installed.
  • the plate 20 is arranged with a non-conductive cover arranged over one or both faces of the plate, and for example may be integrated with a cover in the guise of a vehicle registration plate.
  • Flexible plates may for example comprise an electrically conductive metallic mesh, for example expanded metal.
  • Rigid plates may for example comprise a circuit board with its ground plane, or metal sheet. Copper is a particularly suited metal for any of these plate constructions owing to its excellent electrical conduction properties.
  • the antenna produced is conveniently sized and shaped to enable it to be hermetically sealed, thereby reducing the risk of degradation in performance over time due to corrosion or other environmental effects.
  • the relatively simple construction and convenient dimensions enable a relatively robust antenna package to be produced, with the antenna being easily mountable and concealable in a range of applications.
  • the area around the closed end 222 of the second notch 22 comprises an adjustment portion provided to facilitate change to the effective length of the second notch 22.
  • the second notch 22 is relatively longer than required. If required, a conductive patch can be applied across the second notch 22 at the closed end 222 thereof, effectively reducing the length of the second notch 22.
  • the change in length of the second notch 22 enables frequency response of the antenna to be easily adjusted to suit its environment. For example, shift in the centre frequency of the desired operating frequency range caused by permittivity of the structure on which the antenna 10 is mounted, or that of nearby metallic structures, can now be compensated for.
  • the two linear notches provide a circular polar response with high efficiency over a significant bandwidth range.
  • a high efficiency is achievable over more than a 10% of the bandwidth.
  • the centre frequency of the antenna can be altered by simply adjusting the length of the unfed second notch 22 there is no need to reposition the feed line when installing and tuning the antenna.
  • the manufacturing method comprises the steps of providing a first notch coupled to a feed line, and providing a second notch in use to be passively excited by a signal supplied to the first notch through the feed line, in the case of transmission.
  • the notch antenna manufacturing method suitably further comprises providing an adjustment portion for the second notch. The adjustment portion is provided along the second notch to enable a change in the effective electrical length of the second notch.
  • the installation method comprises the steps of providing a notch antenna comprising a first notch coupled to a feed line, and a second notch, in use to be passively excited by a signal supplied to the first notch through the feed line, installing the antenna at a desired installation position, and providing an adjustment portion for the second notch to change the effective length of the second notch in response to a detected frequency shift from a desired centre frequency caused by the local environmental effects about the installation position.
  • the step of providing the adjustment portion comprises providing a piece of adhesive backed metallic tape at the closed end of the second notch.
  • the step of providing the adjustment portion comprises providing a suitable electronically activated semiconductor device or devices to bridge the second notch at an appropriate position, for example providing one or more PIN diode switches.
  • FIG 3 shows a schematic front view of a plate 20 for a tuneable notch antenna according to an example embodiment of the invention described herein.
  • the plate 20 is intended for an antenna designed to operate at a lowest frequency of 405 MHz in free space. It can be seen in Figure 3 that the unfed notch has been, coincidently, reduced to half the width of the plate to give a modified centre frequency of 430 MHz.
  • example embodiments of the invention described herein are operable over frequencies in the lower UHF band, up to and including the S-Band, for example in the range 0.2GHz to 4GHz.
  • Figure 4 shows the VSWR of an antenna constructed from the plate of Figure 3
  • Figures 5 and 6 show the radiation characteristics of the antenna.
  • Figure 5 shows the pattern in the yz plane and Figure 6 shows the pattern in the xy plane.
  • Figures 5 and 6 show radiation patterns similar to those produced by a dipole aligned on the z axis, with the antenna providing a complete 360 degree azimuth radiation pattern.
  • simple, effective and readily tunable antenna constructions with related componentry, and related method steps have been described, able to produce a notch antenna that operates efficiently over a useful range of frequencies.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Waveguide Aerials (AREA)
  • Support Of Aerials (AREA)

Claims (13)

  1. Antenne (10) à encoches comportant :
    une plaque électriquement conductrice (20) ;
    des première et deuxième encoches (21, 22) formées dans ladite plaque (20), la première encoche (21) comportant une extrémité ouverte (211) à un bord de la plaque (20), une extrémité fermée (212), et des bords longs (213) entre les extrémités ouverte et fermée (211, 212) et la deuxième encoche (22) comportant une extrémité ouverte (221) à un bord de la plaque (20), une extrémité fermée (222), et des bords longs (223) entre les extrémités ouverte et fermée (221, 222) ;
    une ligne (30) d'alimentation couplée à la première encoche (21), la deuxième encoche (22) étant disposée près de la première encoche (21) et configurée pour être excitée passivement par un signal fourni à la première encoche (21) via la ligne (30) d'alimentation ;
    une partie de réglage comportant un composant parmi un élément conducteur, un semi-conducteur et/ou un interrupteur placé en travers de la deuxième encoche (22) pour en raccourcir la longueur effective ;
    les première et deuxième encoches (21, 22) s'ouvrant sur des bords opposés de la plaque pour assurer une réponse polaire circulaire.
  2. Antenne à encoches selon la revendication 1, la plaque (20) comportant un matériau élastiquement déformable.
  3. Antenne à encoches selon la revendication 1 ou 2, l'antenne (10) à encoches comportant en outre une couverture électriquement non conductrice disposée pardessus au moins une face de la plaque (20).
  4. Antenne à encoches selon l'une quelconque des revendications 1-3, la plaque (20) étant généralement rectangulaire.
  5. Antenne à encoches selon l'une quelconque des revendications précédentes, la largeur de la plaque étant supérieure ou égale à un quart d'une longueur d'onde au centre de la plage de fréquences de fonctionnement.
  6. Antenne à encoches selon la revendication 4 ou 5, la première encoche (21) et la deuxième encoche (22) comportant des bords longs alignés avec la dimension de largeur de la plaque.
  7. Antenne à encoches selon l'une quelconque des revendications précédentes, la première encoche (21) et la deuxième encoche (22) étant de longueur inférieure ou égale à un cinquième d'une longueur d'onde au centre de la plage de fréquences de fonctionnement spécifiée pour l'antenne (10) à encoches.
  8. Antenne à encoches selon l'une quelconque des revendications précédentes, comportant un corps électriquement hermétique placé autour de la plaque (20), et la partie de réglage comportant un conducteur qui est couplé de façon capacitive à la plaque (20).
  9. Antenne à encoches selon la revendication 8, la partie de réglage comportant un morceau de ruban métallique à revers adhésif.
  10. Antenne à encoches selon l'une quelconque des revendications précédentes, les première et deuxième encoches (21, 22) présentant des longueurs différentes et la deuxième encoche (22) étant plus longue que la première encoche (21).
  11. Plaque d'immatriculation de véhicule comportant l'antenne à encoches selon l'une quelconque des revendications précédentes.
  12. Procédé de fabrication de l'antenne à encoches selon l'une quelconque des revendications précédentes, le procédé comportant les étapes consistant à :
    réaliser une plaque électriquement conductrice comportant une première encoche couplée à une ligne d'alimentation, et réaliser une deuxième encoche destinée, en cours d'utilisation, à être excitée passivement par un signal fourni à la première encoche via la ligne d'alimentation ;
    le procédé comportant en outre l'étape consistant à munir la deuxième encoche de la partie de réglage pour modifier la longueur effective de la deuxième encoche.
  13. Procédé selon la revendication 12, comportant les étapes consistant à installer l'antenne dans une position d'installation souhaitée, et à munir la deuxième encoche de la partie de réglage pour modifier la longueur effective de la deuxième encoche en réponse à un décalage détecté de fréquence par rapport à une fréquence centrale souhaitée, causé par la permittivité électrique de la position d'installation.
EP10805726.6A 2009-12-14 2010-12-14 Antenne à encoche Not-in-force EP2514031B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0921811.6A GB0921811D0 (en) 2009-12-14 2009-12-14 Notch antenna
GBGB1008784.9A GB201008784D0 (en) 2009-12-14 2010-05-26 Notch antenna
GB1009752A GB2476132A (en) 2009-12-14 2010-06-11 Fed and parasitic notch antenna arrangement
PCT/GB2010/052079 WO2011073645A2 (fr) 2009-12-14 2010-12-14 Antenne à encoche

Publications (2)

Publication Number Publication Date
EP2514031A2 EP2514031A2 (fr) 2012-10-24
EP2514031B1 true EP2514031B1 (fr) 2018-12-05

Family

ID=41667051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10805726.6A Not-in-force EP2514031B1 (fr) 2009-12-14 2010-12-14 Antenne à encoche

Country Status (3)

Country Link
EP (1) EP2514031B1 (fr)
GB (3) GB0921811D0 (fr)
WO (1) WO2011073645A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106537690A (zh) * 2015-08-31 2017-03-22 华为技术有限公司 一种缝隙天线和终端设备
US10573970B2 (en) 2016-01-28 2020-02-25 Sony Corporation Antenna arrangement on a circuit board
US10218077B2 (en) * 2016-08-04 2019-02-26 Te Connectivity Corporation Wireless communication device having a multi-band slot antenna with a parasitic element
CN113809519B (zh) 2017-12-28 2023-08-22 华为技术有限公司 一种多频天线及移动终端

Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2000069021A1 (fr) * 1999-05-05 2000-11-16 Asg Technology Limited Systeme d'antenne de radiocommunications cache

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US2600179A (en) * 1946-02-18 1952-06-10 Alford Andrew Split cylinder antenna
JPH07249926A (ja) * 1994-03-09 1995-09-26 Matsushita Electric Works Ltd 平面アンテナ
US5754143A (en) * 1996-10-29 1998-05-19 Southwest Research Institute Switch-tuned meandered-slot antenna
US5917454A (en) * 1997-08-22 1999-06-29 Trimble Navigation Limited Slotted ring shaped antenna
US6320544B1 (en) * 2000-04-06 2001-11-20 Lucent Technologies Inc. Method of producing desired beam widths for antennas and antenna arrays in single or dual polarization
TW535329B (en) * 2001-05-17 2003-06-01 Acer Neweb Corp Dual-band slot antenna
JP3844717B2 (ja) * 2002-07-19 2006-11-15 ソニー・エリクソン・モバイルコミュニケーションズ株式会社 アンテナ装置および携帯無線通信端末
TWI256749B (en) * 2004-04-30 2006-06-11 Hon Hai Prec Ind Co Ltd Multi-band antenna
EP1859508A1 (fr) * 2005-03-15 2007-11-28 Fractus, S.A. Plan de masse a fente utilise comme antenne a fente ou pour une antenne pifa
TWI313082B (en) * 2005-08-16 2009-08-01 Wistron Neweb Corp Notebook and antenna thereof
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JP4904197B2 (ja) * 2007-05-08 2012-03-28 パナソニック株式会社 不平衡給電広帯域スロットアンテナ
TWM347695U (en) * 2008-01-31 2008-12-21 Wistron Neweb Corp Antenna

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2000069021A1 (fr) * 1999-05-05 2000-11-16 Asg Technology Limited Systeme d'antenne de radiocommunications cache

Also Published As

Publication number Publication date
WO2011073645A2 (fr) 2011-06-23
WO2011073645A3 (fr) 2011-08-18
GB201008784D0 (en) 2010-07-14
EP2514031A2 (fr) 2012-10-24
GB2476132A (en) 2011-06-15
GB0921811D0 (en) 2010-01-27
GB201009752D0 (en) 2010-07-21

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