EP1471599A1 - Antenne planaire multibandes - Google Patents

Antenne planaire multibandes Download PDF

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Publication number
EP1471599A1
EP1471599A1 EP20040009669 EP04009669A EP1471599A1 EP 1471599 A1 EP1471599 A1 EP 1471599A1 EP 20040009669 EP20040009669 EP 20040009669 EP 04009669 A EP04009669 A EP 04009669A EP 1471599 A1 EP1471599 A1 EP 1471599A1
Authority
EP
European Patent Office
Prior art keywords
planar antenna
radiant element
patch
antenna according
metallic patch
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Withdrawn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
EP20040009669
Other languages
German (de)
English (en)
Inventor
Guido Biffi Gentili
Matteo Cerretelli
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.)
Ask Industries SpA
Original Assignee
Ask Industries SpA
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 Ask Industries SpA filed Critical Ask Industries SpA
Publication of EP1471599A1 publication Critical patent/EP1471599A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface
    • 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
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element

Definitions

  • the present invention refers to a multiband planar antenna.
  • Various kinds of dual band antennas to be used on vehicles for cellular telephone services are already known. Most of them are of the monopole or asymmetric dipole, wire or strip type to be installed on vehicle roofs near their front or rear edge.
  • the radiant element of said antennas is usually protected by a plastic material casing having also aesthetic and aerodynamic functions, it can be of various shapes and configurations, even though the "dolphin fin" one is the most commonly used.
  • the positioning of the antenna on the roof of vehicles allows obtaining an isotropic diagram on the horizontal plan as the radiation is not influenced by the presence of structural barriers in near sound field.
  • Said printed monopole or dipole planar antennas with constant width strip radiant arms have a common drawback consisting in the intrinsic limitation of the impedance band, therefore the only way to obtain a dual frequency operation is their association to a suitable matching network causing however a further bandwidth reduction.
  • the most relevant consequence of these solutions is substantially the difficulty in covering more services with the same antenna and this condition does not comply with the needs of the car manufacturers which are more and more frequently requiring compact antennas at low costs being able to carry out multiple services on different frequencies.
  • the typical need is the covering of all cellular telephone services including the most recent UMTS (Universal Mobile Telecommunications System) with one antenna.
  • UMTS Universal Mobile Telecommunications System
  • Object of the present invention is to carry out a simple compact multiband planar antenna at low cost being able to cover the present cellular telephone services and optimized for the operation on vehicle roof or on any broad enough metallic surfaces, such as the vehicle rear hood or the doors.
  • Another object consists in obtaining an "intrinsic" bandwidth operation using a planar radiant structure that conceptually derives from the "pressure" of one pseudo-conical radiant element loaded with dielectric material and equipped with ground-connected strip of the type correspondent to the one present in one conical antenna loaded with dielectric material, said antenna is suitable for operation in vertical position on vehicle roof and is shown and described in the European patent no. 01121539.9 having title "Low profile, cord-less aerial" filed on 10.09.2001 in the name of Zendar S.p.A. - 42020 Montecavolo , RE (Italy).
  • Another object is the structuring of the radiant element in such a way to integrate a further commercial "patch” in it for the reception of the GPS (Global Positioning System) satellite signals with the relevant amplification and filtering circuitry.
  • GPS Global Positioning System
  • a further object consists in designing the antenna for an intrinsically bandwidth operation that can be centered on two separate bands through the insertion of a matching network, a first narrower band centered around 900 MHz and a second broader band centered on a frequency that simultaneously covers both the GSM (Global System Mobile) and the UMTS (around 1800 MHz) cellular telephone services.
  • GSM Global System Mobile
  • UMTS around 1800 MHz
  • the antenna keeps its main flatness and thinness features together with the electromagnetic behaviour of a monopole on a finite size ground plane compared with the wavelength such as the roofs, the hoods, the doors the wing mirrors, the windscreen of the vehicles and can take an arbitrary flat or bent triangular, rectangular, trapezoid or polygonal shape in order to fit the manufacturing requirements and the installation constraints.
  • Another advantage consists in that the shape of the metal conductor patch that constitutes the radiant element and the shape of the dielectric material plate on which the same patch is printed can be configured in order to allow the integration of a patch for the GPS satellite signal reception using the same ground plane as the radiant element.
  • a further advantage consists in that the metal conductor patch that constitutes the radiant element can be embedded into a multilayer constituted by thin layers of dielectric and/or magnetic material.
  • the multiband planar antenna according to the invention in its basic embodiment, is substantially constituted by a radiant element obtained by a triangular or polygonal-shaped thin metal conductor patch 1 with one or two coplanar projecting parts with ground-connected strips 2.
  • the metallic patch 1 is generally printed on a single substrate of thin dielectric material 3, by means of the well known selective etching technique which is commonly used for the production of printed circuits. Other suitable methods to obtain the metallic patch can also be used without leaving the scope of the invention, for example the serigraphy with conductive paint.
  • the metallic patch 1 with the relevant strip/strips 2 is obtained on a thin plate of dielectric material 3 associated to a multilayer comprising also thin layers of magnetic materials 4; by means of this solution an appreciable reduction of the multiband planar antenna sizes is obtained; this allows installing the antenna into narrower areas other than the vehicle roofs, for example into wing mirrors, bumpers, doors, spoilers and the like to the detriment of the bandwidth of the antenna.
  • strip/strips 2 allow the in phase electric currents forming the low frequency radiation diagram flowing towards the ground.
  • a further patch 6 for the reception of the GPS satellite signals using the same ground plane 5 without exceedingly compromising the low frequency performance of the antenna can be inserted with an appropriate configuration of the shape of the metal conductor patch that constitutes the radiant element 1, of the shape of the dielectric material plate 3 on which the same patch is printed and removing one of the strips ( Figures 11, 13, 14).
  • the planar radiant element 1 is preferably orthogonally placed with respect to a lower ground plane constituted by a base 5 having the required dimensions compatible with the space available and connects for example with the underlying roof 7 of a vehicle.
  • the input electrical connection of the antenna is constituted by the connection between the lower vertex 8 of the planar radiant element 1 and the middle wire of the coaxial feeder whose earth braid is ground-connected.
  • the connection can be directly obtained or through a circuit containing a concentrated, distributed, or mixed constant matching network 9.
  • a slit 10 allows extending the strip 2 ( Figures 10, 13) so that it can reach the required dimensions in order to obtain a good impedance pattern at the lower end of the strip (below 900 MHz).
  • two dielectric material plates 3 can be used instead of one; these plates are V-placed with the lower feeding vertexes 8 of the metallic patches that constitute the relevant radiant elements 1 in common ( Figure 9) and with the lower ends of the strips being jointly or severally ground-connected; this layout allows reducing the overall dimension in height and obtaining a greater possibility of aerodynamic configuration of its external covering.
  • the multilayer that constitutes the windscreen, the rear window or any other casing or plastic support for accessories such as wing mirrors, spoilers, bumpers and the like can be used as a support for the polygonal-shaped thin metallic patch that constitutes the radiant element 1.
  • the configuration and layout of the plate/plates of dielectric material supporting the radiant element 1 with respect to the ground plane 5-7 and the optimization of shapes and dimensions allow obtaining the utmost bandwidth consistent with the overall dimensions available for the application of the antenna.
  • the antenna keeps its main flatness feature together with the typical electromagnetic behaviour of a monopole on a ground plate with limited dimensions, preferably of big dimensions, with respect to the wavelength, such as roofs, hoods, doors and windscreens of vehicles, it can also have any arbitrary flat bent triangular, rectangular, trapezoidal shape in order to fit, also from the aesthetical point of view, the requirements and the installation constraints on any position and/or any kind of vehicle.
  • the radiative behaviour of the antenna is similar to the one of a monopole operating on the same ground plane.
  • the circuit with concentrated, distributed or mixed constant integrated matching network 9, associated to the input electrical connection of the antenna is used to optimize the performances on two separate bands; the first narrower band is centered around 900 MHz and the second broader band is centered around a frequency that simultaneously covers the GSM and UMTS cellular phone services (between 1700 and 2200 MHz).
  • the function of the matching network is the centering of the two minimums of the chart on the frequency values required.
EP20040009669 2003-04-24 2004-04-23 Antenne planaire multibandes Withdrawn EP1471599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE20030042 2003-04-24
IT000042A ITRE20030042A1 (it) 2003-04-24 2003-04-24 "antenna planare multibanda"

Publications (1)

Publication Number Publication Date
EP1471599A1 true EP1471599A1 (fr) 2004-10-27

Family

ID=29267159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040009669 Withdrawn EP1471599A1 (fr) 2003-04-24 2004-04-23 Antenne planaire multibandes

Country Status (3)

Country Link
EP (1) EP1471599A1 (fr)
CN (1) CN1551410A (fr)
IT (1) ITRE20030042A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066327A1 (fr) * 2005-12-05 2007-06-14 Elta Systems Ltd. Antenne monopole fractale
EP2146392A3 (fr) * 2008-07-16 2010-02-03 R.A. Miller Industries, INC. Antenne marine multibande
DE102011113725A1 (de) * 2011-09-17 2013-03-21 Volkswagen Aktiengesellschaft Mehrbereichsantenne für ein Kraftfahrzeug
GB2507788A (en) * 2012-11-09 2014-05-14 Univ Birmingham Vehicle roof mounted reconfigurable MIMO antenna
US8928545B2 (en) 2011-12-05 2015-01-06 Nxp, B.V. Multi-band antenna
EP1944830B1 (fr) * 2005-01-31 2015-04-08 Fujitsu Component Limited Appareil d'antenne et dispositif électronique
US9190719B2 (en) 2011-03-03 2015-11-17 Nxp B.V. Multiband antenna
EP3048667A1 (fr) * 2015-01-23 2016-07-27 LG Innotek Co., Ltd. Antenne à capot multibande

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8466842B2 (en) * 2010-10-22 2013-06-18 Pittsburgh Glass Works, Llc Window antenna
US11600908B2 (en) * 2015-12-28 2023-03-07 Kymeta Corporation Device, system and method for providing a modular antenna assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363114A (en) * 1990-01-29 1994-11-08 Shoemaker Kevin O Planar serpentine antennas
EP0790664A2 (fr) * 1995-10-06 1997-08-20 Ford Motor Company Antenne de véhicule
WO2001026182A1 (fr) * 1999-10-04 2001-04-12 Smarteq Wireless Ab Moyens d'antenne
EP1189305A2 (fr) * 2000-09-13 2002-03-20 ZENDAR S.p.A. Antenne courte sans fil
EP1260998A1 (fr) * 2000-11-16 2002-11-27 TDK Corporation Substrat pour composant electronique et composant electronique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5363114A (en) * 1990-01-29 1994-11-08 Shoemaker Kevin O Planar serpentine antennas
EP0790664A2 (fr) * 1995-10-06 1997-08-20 Ford Motor Company Antenne de véhicule
WO2001026182A1 (fr) * 1999-10-04 2001-04-12 Smarteq Wireless Ab Moyens d'antenne
EP1189305A2 (fr) * 2000-09-13 2002-03-20 ZENDAR S.p.A. Antenne courte sans fil
EP1260998A1 (fr) * 2000-11-16 2002-11-27 TDK Corporation Substrat pour composant electronique et composant electronique

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1944830B1 (fr) * 2005-01-31 2015-04-08 Fujitsu Component Limited Appareil d'antenne et dispositif électronique
US7248223B2 (en) 2005-12-05 2007-07-24 Elta Systems Ltd Fractal monopole antenna
WO2007066327A1 (fr) * 2005-12-05 2007-06-14 Elta Systems Ltd. Antenne monopole fractale
EP2146392A3 (fr) * 2008-07-16 2010-02-03 R.A. Miller Industries, INC. Antenne marine multibande
US8130155B2 (en) 2008-07-16 2012-03-06 R.A. Miller Industries, Inc. Marine multiband antenna
US9190719B2 (en) 2011-03-03 2015-11-17 Nxp B.V. Multiband antenna
DE102011113725A1 (de) * 2011-09-17 2013-03-21 Volkswagen Aktiengesellschaft Mehrbereichsantenne für ein Kraftfahrzeug
US8928545B2 (en) 2011-12-05 2015-01-06 Nxp, B.V. Multi-band antenna
GB2507788A (en) * 2012-11-09 2014-05-14 Univ Birmingham Vehicle roof mounted reconfigurable MIMO antenna
EP3048667A1 (fr) * 2015-01-23 2016-07-27 LG Innotek Co., Ltd. Antenne à capot multibande
KR20160091090A (ko) * 2015-01-23 2016-08-02 엘지이노텍 주식회사 샤크 핀 안테나
CN105826658A (zh) * 2015-01-23 2016-08-03 Lg伊诺特有限公司 鲨鱼鳍天线
US10056686B2 (en) 2015-01-23 2018-08-21 Lg Innotek Co., Ltd. Shark pin antenna
CN105826658B (zh) * 2015-01-23 2019-01-15 Lg伊诺特有限公司 鲨鱼鳍天线

Also Published As

Publication number Publication date
CN1551410A (zh) 2004-12-01
ITRE20030042A1 (it) 2004-10-25
ITRE20030042A0 (it) 2003-04-24

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