EP1091444A2 - Planare Antenne für Motorfahrzeuge - Google Patents
Planare Antenne für Motorfahrzeuge Download PDFInfo
- Publication number
- EP1091444A2 EP1091444A2 EP00121650A EP00121650A EP1091444A2 EP 1091444 A2 EP1091444 A2 EP 1091444A2 EP 00121650 A EP00121650 A EP 00121650A EP 00121650 A EP00121650 A EP 00121650A EP 1091444 A2 EP1091444 A2 EP 1091444A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- planar antenna
- motor
- antenna
- radiant element
- vehicles according
- 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.)
- Granted
Links
- 230000001413 cellular effect Effects 0.000 claims abstract description 5
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 238000001465 metallisation Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005672 electromagnetic field Effects 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 241001422033 Thestylus Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
-
- 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
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
-
- 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
- H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
-
- 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 present invention relates to a planar antenna for motor-vehicles. More particularly, the present invention relates to a microstrip (patch) planar antenna, particularly suitable for use in motor-cars both for cell-phones and for different applications.
- a microstrip (patch) planar antenna particularly suitable for use in motor-cars both for cell-phones and for different applications.
- the planar antenna of the present invention is preferably located on the windows of motor-vehicles, in particular on the rear window. It may be utilized both in the cell-phones of the present frequency field of 800/900 MHz (GSM, ETACS, AMPS, PCD) up to the higher frequencies of 2.5 GHz (DCS, UMTS, PCN, PDC, 1.5) and for applications other than telephony, such as for instance: reception in L, DAB, GPS band and the like, and at higher frequencies up to 6 GHz, as well as for Telepass type transponder systems of the, and the like.
- Radiophony systems for motor-vehicles are known that utilize frequencies in the UHF band; at present systems are widespreading that use higher frequency systems, suitable to obtain an increasing number of transmission channels.
- the present antennas adopted in such systems are of the stylus type; they are installed on the vehicles' metal roofs and provide acceptable performances, with an almost omnidirectional radiation and vertical polarization.
- the metal roof acts as a mass plane and provides a good shielding for the interior compartment from the electromagnetic radiation emitted by the antenna.
- said antennas while having proved to have satisfactory radioactive characteristics, have some drawbacks.
- these antennas while allowing the application without making holes in the body, comprise always an external protruding part subject to damages, tampering and/or vandalisms.
- antennas have been realized that are directly mounted on the windscreen or the rear glass, in the inside of the passengers' compartment. They are constituted of flat leads having various shapes similar to monopoles or dipoles which however, because of their elongated shape, are mainly installed in an horizontal position, with ensuing distortion of the polarization of the magnetic field and a severe degradation of the radiation diagram, because of the electromagnetic coupling with the metal structures of the vehicle. Besides, their emission takes place indifferently both towards the inside and the outside of the passengers' compartment, exposing said passengers to high levels of electromagnetic field.
- Planar antennas suitable for the frequencies of the radiotelephone systems can be derived from the theory of the so-called patch-antennas, that consist essentially of two conductive surfaces, one of which has generally a size greater than the other one, aligned in parallel at a distance shorter than the wave length; between the two leads a dielectric material may be interposed or, more simply, the leads are maintained in the position by insulating spacers exploiting air as a dielectric.
- This class of antennas includes also the one called "QWSCM" (Quarter Wave Short Circuited Microstrip Antenna) wherein the resonating length of the upper lead is reduced by ⁇ /2 to ⁇ /4, shorting a radiant edge.
- VSWR 2 (Voltage Standing Wave Ratio) and a prevailingly isotropic radiation diagram.
- Object of this invention is to eliminate the above drawbacks.
- planar antenna for motor-vehicles having the features of the characterizing part of claim 1.
- the antenna of the present invention has a low profile with contained dimensions, is of simple construction and low cost, and can be easily installed in the inside of vehicles' compartments.
- the antenna of the present invention lies essentially in that it has a band length equal to or higher than 10%; it can irradiate uniformly throughout the horizontal plane with a prevailingly vertical polarization of the electric field, as it may be compared to a horizontal radiant slot (magnetic current) and allows an adequate containment of the radiation emitted in the inside of passengers' compartment, avoiding the exceeding of the electromagnetic field limits indicated by the norms in force. It may be installed, on a prior simple tuning, on any type of vehicle.
- the figures refer to a planar patch-antenna for use in motor-car applications of cellular telephony, of the known type indicated by the initials "QWSCM”.
- the microstrip planar antenna (patch) of the present invention comprises a radiant element 1, that adheres to glass 2 constituting the windshield or the rear window of a vehicle: a mass plane 8 parallel to said radiant element 1 and a continuous striped metal lead 9 connecting said radiant element to said mass plane 8, and constituting the mass shorting element.
- Said antenna is fed by a coaxial cable 5 fixed to a capacitive coupling 4 applied to the mass plane 8 and spaced from the radiant element 1 by a portion which depends on the operating band of the antenna.
- the radiant element 1, the shorting lead 9 arranged orthogonally and the mass plane 8 are realized by punching and subsequent bending of one only continuos wall (9) which is oriented in a substantially orthogonal manner with respect to the radiant element 1 and the mass plane 8, parallel with each other.
- the antenna is fed through a flat armor 13 capacitive coupling 4.
- the lower distance of armor 13 from the upper radiant element 1 can be adjusted in order to optimize the radioactive and circuit characteristics of the antenna, in particular to optimize its band width.
- the mass plane 8 may be possibly extended by means of a suitable transparent metallization of the low resistance, high optical transmittance rear window.
- transparent conductive films 2' applied on normal glasses may be utilized, or glasses already metallized by vacuum evaporation or sputtering, such as those already mounted on many models of motor-vehicles.
- the main characteristics of the antenna of the present invention are basically the following:
- Such characteristics cause the antenna of the present invention to be substantially universal for applications on any types of motor-cars and allow to operate in a band width equal to or higher than 10%, with a uniform irradiation on the horizontal plane, with a prevailingly vertical polarization of the electric field and boundary emissions of the electromagnetic field in the inside of the vehicle comprised within those indicated by the norms in force.
- the mass shorting wall instead of being constituted of a continuous lead 9, is constituted of several suitably spaced strips 9' whose number and shape or size are characterizing parameters of the project of the antenna, depending on the determination of the overall entity of the inductive charge and the entity of the reduction in the physical size of the antenna.
- the width determines the equivalent inductance associated to each strip.
- Figure 4 schematizes the circuit configuration equivalent to a transmission line, wherefrom one understands that the inductive charging, realized by means of a plurality of strips 9' spaced by gaps, allows to shorten the resonant length of the antenna and, as a consequence, to reduce the size thereof.
- the broken lines represent the width of RF voltage within the antenna.
- a further embodiment realizable even more easily and which is more suitable for mass industrialization, is obtained by forming the mass plane 8 of the antenna from a printed circuit board metallized on one side only, for instance by means of a surface coppering, and having a coplanar transmission line printed or etched as shown in Figure 6.
- the feeding line can be realized in the form of a coplanar microstrip, with the following advantages:
- the radiant element 1 that comprises arc-shaped strips 9'' is directly fastened to the conductive layer 12 of the mass plane 8 of the board by means of welding or rivets.
- the fastening is carried out along the lower ends of said strips 9''.
- the capacitive coupling 4' is realized by means of a suspended foil 13, also provided with an arc-shaped strip 14 whose lower end is welded or tied with rivets or the like, at an end of the coplanar transmission line whose other end is connected to the connector or, more simply, to the coaxial cable 5.
- Figure 7 shows the diagram of SWR or ROS (Stationary Waive Ratio) of an antenna according to the invention, measured with a 50 ohm standard instruments: as can be observed, its band with SWR ⁇ 2 is given by frequencies (700-1130) MHz and that the percent value with respect to the central frequency is > 20%.
- the planar antenna of the present invention is applied in particular in cellular telephony, from the present frequencies of 800/900 MHz (GSM, ETACS, AMPS, PCD) up to the higher ones of 2.5 GHz (DCS, UMTS, PCN, PCD 1.5); besides, it may be utilized for applications other than telephony, such as L, DAB, GPS band reception and the like and at higher frequencies up to 6 GHz, also for Telepass type transponder systems, and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITRE990101 | 1999-10-08 | ||
IT1999RE000101A IT1309775B1 (it) | 1999-10-08 | 1999-10-08 | Antenna planare per autoveicoli. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1091444A2 true EP1091444A2 (de) | 2001-04-11 |
EP1091444A3 EP1091444A3 (de) | 2002-04-17 |
EP1091444B1 EP1091444B1 (de) | 2003-12-17 |
Family
ID=11399497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00121650A Expired - Lifetime EP1091444B1 (de) | 1999-10-08 | 2000-10-04 | Planare Antenne für Motorfahrzeuge |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1091444B1 (de) |
DE (1) | DE60007254T2 (de) |
IT (1) | IT1309775B1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2825517A1 (fr) * | 2001-06-01 | 2002-12-06 | Socapex Amphenol | Antenne a plaque |
DE102004027692A1 (de) * | 2004-03-10 | 2005-10-06 | Daimlerchrysler Ag | Verwendung einer invertierten L-Antenne in einem Kraftfahrzeug |
EP1624527A1 (de) * | 2003-04-24 | 2006-02-08 | Asahi Glass Company Ltd. | Antenneneinrichtung |
JPWO2019151407A1 (ja) * | 2018-02-02 | 2021-01-14 | Agc株式会社 | アンテナ装置、車両用窓ガラス及び窓ガラス構造 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004041014B3 (de) * | 2004-08-24 | 2006-01-19 | Siemens Ag | Antenne und Verfahren zu deren Herstellung |
DE102009048229B4 (de) * | 2009-10-05 | 2021-01-21 | Sennheiser Electronic Gmbh & Co. Kg | Antenneneinheit für eine Drahtlos-Audioübertragung |
DE102018126361A1 (de) * | 2018-10-23 | 2020-04-23 | Fuba Automotive Electronics Gmbh | Folienantenne |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60134605A (ja) * | 1983-12-23 | 1985-07-17 | Mitsubishi Electric Corp | マイクロストリツプアンテナ |
EP0526643A1 (de) * | 1991-01-28 | 1993-02-10 | Mitsubishi Denki Kabushiki Kaisha | Antennenanordnung |
EP0801435A2 (de) * | 1996-04-09 | 1997-10-15 | FUBA Automotive GmbH | Flachantenne |
EP0851528A2 (de) * | 1996-12-30 | 1998-07-01 | General Motors Corporation | Fahrzeugscheibenantenne |
-
1999
- 1999-10-08 IT IT1999RE000101A patent/IT1309775B1/it active
-
2000
- 2000-10-04 DE DE60007254T patent/DE60007254T2/de not_active Expired - Lifetime
- 2000-10-04 EP EP00121650A patent/EP1091444B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60134605A (ja) * | 1983-12-23 | 1985-07-17 | Mitsubishi Electric Corp | マイクロストリツプアンテナ |
EP0526643A1 (de) * | 1991-01-28 | 1993-02-10 | Mitsubishi Denki Kabushiki Kaisha | Antennenanordnung |
EP0801435A2 (de) * | 1996-04-09 | 1997-10-15 | FUBA Automotive GmbH | Flachantenne |
EP0851528A2 (de) * | 1996-12-30 | 1998-07-01 | General Motors Corporation | Fahrzeugscheibenantenne |
Non-Patent Citations (2)
Title |
---|
KENICHI KAGOSHIMA ET AL: "ANALYSIS OF A PLANAR INVERTED F ANTENNA FED BY ELECTROMAGNETIC COUPLING" PROCEEDINGS OF THE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSIS). CHICAGO, JULY 20 - 24, 1992, NEW YORK, IEEE, US, vol. 3, 20 July 1992 (1992-07-20), pages 1702-1705, XP000340013 ISBN: 0-7803-0730-5 * |
PATENT ABSTRACTS OF JAPAN vol. 009, no. 295 (E-360), 21 November 1985 (1985-11-21) -& JP 60 134605 A (MITSUBISHI DENKI KK), 17 July 1985 (1985-07-17) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2825517A1 (fr) * | 2001-06-01 | 2002-12-06 | Socapex Amphenol | Antenne a plaque |
EP1624527A1 (de) * | 2003-04-24 | 2006-02-08 | Asahi Glass Company Ltd. | Antenneneinrichtung |
EP1624527A4 (de) * | 2003-04-24 | 2007-02-21 | Asahi Glass Co Ltd | Antenneneinrichtung |
US7365685B2 (en) | 2003-04-24 | 2008-04-29 | Asahi Glass Company, Limited | Antenna device |
DE102004027692A1 (de) * | 2004-03-10 | 2005-10-06 | Daimlerchrysler Ag | Verwendung einer invertierten L-Antenne in einem Kraftfahrzeug |
JPWO2019151407A1 (ja) * | 2018-02-02 | 2021-01-14 | Agc株式会社 | アンテナ装置、車両用窓ガラス及び窓ガラス構造 |
US11522278B2 (en) | 2018-02-02 | 2022-12-06 | AGC Inc. | Antenna device, window glass for vehicle, and window glass structure |
Also Published As
Publication number | Publication date |
---|---|
IT1309775B1 (it) | 2002-01-30 |
ITRE990101A1 (it) | 2001-04-08 |
DE60007254D1 (de) | 2004-01-29 |
ITRE990101A0 (it) | 1999-10-08 |
EP1091444A3 (de) | 2002-04-17 |
DE60007254T2 (de) | 2004-09-30 |
EP1091444B1 (de) | 2003-12-17 |
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