EP1135828A1 - Ensemble antenne comportant au moins une antenne installee notamment sur une vitre d'un vehicule automobile - Google Patents
Ensemble antenne comportant au moins une antenne installee notamment sur une vitre d'un vehicule automobileInfo
- Publication number
- EP1135828A1 EP1135828A1 EP99962073A EP99962073A EP1135828A1 EP 1135828 A1 EP1135828 A1 EP 1135828A1 EP 99962073 A EP99962073 A EP 99962073A EP 99962073 A EP99962073 A EP 99962073A EP 1135828 A1 EP1135828 A1 EP 1135828A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- lmk
- arrangement according
- distance
- signal
- 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.)
- Ceased
Links
Classifications
-
- 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
- H01Q1/1278—Supports; Mounting means for mounting on windscreens in association with heating wires or layers
-
- 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
Definitions
- the invention relates to an antenna arrangement with at least one LMK antenna, which is arranged on a pane or other non-conductive parts of a motor vehicle and has an antenna capacity C a , and with an antenna amplifier for LMK reception.
- Such antenna arrangements are used in particular on the corner plate of a motor vehicle. Of course, they can also be used on other windows, such as side windows, the front window or on other non-conductive parts of motor vehicles, such as spoilers.
- Preamble of claim 1 has been assumed is known from EP-C-0-155 647.
- This known antenna arrangement which is obviously designed exclusively for use on the rear window of motor vehicles, is arranged on an area not occupied by the heating field.
- the LMK (long-wave, medium-wave, short-wave) antenna has an areal extension.
- EP-C-0-155 647 teaches that the size of the antenna area must be in a very specific relationship to the size of the available area in order to obtain a maximum input signal for the antenna amplifier. It is expressly explained that, in order for the reception to be optimal, it is absolutely necessary that the signal voltage at the input of the LMK amplifier is maximal.
- the conductive surface acts as a capacitor, the impedance of which increases with decreasing frequency. All transistors show minimal noise only with a very specific Que11 impedance. If the impedance deviates from this, their noise increases.
- the antenna known from EP-C-0 155 647 is optimally adapted in the upper medium wave range and in the course wave range (also referred to as upper LMK range), in the lower medium wave range and in long wave range (lower LMK range) however, losses in reception quality are accepted. This is particularly disadvantageous because the signal / noise emission of the antenna in the lower LMK range and especially in the long-wave range is in any case significantly worse than in the upper LMK-3 range.
- the object of the invention is to develop an antenna arrangement according to the preamble of claim 1 in such a way that optimum reception results under practically all operating conditions and frequencies.
- One inventive solution to this problem is defined tent pipe 1 in Pa ⁇ . Further developments of the invention are the subject of the dependent claims.
- the invention is based on the basic idea of adapting the LMK antenna to the antenna amplifier in such a way that there is an optimal signal / noise ratio in the lower LMK range.
- the distance of the antenna conductor or antennas from the parts surrounding the LMK antenna is selected such that the value is the harmful capacitance C 3 of the LMK antenna, which is essentially formed by the capacitance between the antenna conductors and the conductive parts surrounding the antenna is chosen to be greater than the value at which the maximum antenna output voltage results, and that the value of the harmful capacitance C 3 is selected such that the signal / noise ratio is not in the upper, but rather by appropriate selection of the source impedance of the antenna amplifier is optimized in the lower LMK range.
- the invention thus breaks with the usual procedure according to which damage or stray capacities are minimized as far as possible.
- fiction, econceß a comparatively large Schadkapa ⁇ itst is deliberately adjusted *, by which the swelling capacity of the input transistor is increased so that, although the input signal, but rather the signal / noise ratio is not a maximum optimal.
- This adaptation according to the invention can be achieved, for example, by selecting the conductive area A acting as an antenna to be larger than that described in EP-C-0 155 647. Since the area A is increased according to the invention compared to the prior art, the capacity of the antenna increases with respect to the electromagnetic field.
- the damage capacity increases due to the reduced distance from the conductive parts surrounding the antenna conductors, such as metallic body parts, the heating wires of the rear window, etc.
- the amount of the capacitive component Z ⁇ of the source impedance is smaller. This reduces the amount Z of the source impedance.
- the signal voltage at the amplifier input also decreases, but at the same time the input noise of the transistor used also decreases very significantly in the lower LMK range.
- this measure leads to an improvement in the signal / P-au ⁇ ch distance for practically all common transistors.
- F g. 1 the noise voltage of a conventional LMK amplifier with a FET J310 as an amplifying element
- Fig. 4 shows the dependence of the capacity of the antenna on the ratio b / h.
- FIG. 1 shows the noise voltage of a conventional LMK amplifier with a FET J310 as a reinforcing element as functions of the frequency in the long and medium wave range.
- the frequency in MHz is plotted on the abscissa, while the noise voltage is plotted on the ordinate.
- 1 shows the dependency of the noise voltage as a function of the frequency for different source 3 impedances.
- the Rausc voltage for the transistor illustrated by way of example rises sharply with a decreasing source impedance, at least for frequencies below 1 MHz.
- 2 shows an example of the arrangement of an LMK antenna according to the invention on the rear window of a motor vehicle.
- the LMK antenna 1 is arranged between a heating field 2 and a conductive frame 3 of the rear window.
- the antenna is arranged in the center of this area as a conductive area.
- the antenna has the transverse dimension b and the distance a from the frame 3 or the heating field 2.
- c is the distance of the antenna from the lateral edge of the pane.
- the lateral distance c of the antenna from the conductive window frame has been left constant at 3 cm. Only the transverse dimension b is varied. Of course, it is also possible to vary both c and b.
- FIG. 3 shows measurement results obtained with an exemplary selected car radio.
- the ratio b / h is plotted on the abscissa, while the antenna voltage is plotted on the left ordinate and the sensitivity for a signal / noise ratio of 20 dB is plotted on the right ordinate.
- the values for different frequencies are given, whereby the assignment of the symbols used to specific frequency values can be found in the legend below the diagram.
- Fig. 3 shows that with a value of the ratio b / h of 0.4 a maximum antenna voltage is obtained, but at least for frequencies in the lower LMK range no optimal signal / noise ratio is obtained.
- the signal / noise ratio improves in the lower LMK range, while it is only slightly reduced in the upper LMK range.
- Fig. 4 shows the capacitance of the antenna in pF as a function of the ratio b / h.
- the harmful capacitance C E increases disproportionately at the height h of the AM antenna under consideration, which not only reduces the antenna voltage, but also the signal / noise ratio.
- the value 0.6 applies to an optimal b / h ratio according to the teaching according to the invention only for a height h of the available area of 13 cm.
- the optimal b / h ratio is at other values; based on the above statements, these values can be found without inventive step by optimizing the signal / noise ratio in the lower LMK range. This always leads to a larger b / h ratio than the optimization of the signal / noise ratio for the upper LMK range or the maximization of the signal size for the upper LMK range.
- the antenna can be attached to any window - not just the rear window - or to other non-conductive parts of the vehicle, such as spoilers, attachments made of a plastic material, etc.
- the antenna is arranged on the rear window, it is possible to integrate an FM antenna into the entire antenna arrangement, which uses the heating wires of the heated rear window.
- the LMK antenna according to the invention can of course also have a shape other than that shown, for example a non-rectangular shape or the shape of a U or an E.
Landscapes
- Details Of Aerials (AREA)
Abstract
L'invention concerne un ensemble antenne comportant: au moins une antenne à ondes kilométriques, hectométriques, décamétriques, qui est placée sur une vitre ou sur une autre partie non conductrice d'un véhicule automobile et qui présente une capacité Ca, ainsi qu'un amplificateur d'antenne pour la réception des ondes kilométriques, hectométriques, décamétriques. Cette antenne est caractérisée en ce que la distance entre le ou les conducteurs d'antenne et les parties entourant ladite antenne est sélectionnée de sorte que la capacité parasite C3 de l'antenne, formée essentiellement par la capacité entre les conducteurs d'antenne et les parties conductrices entourant l'antenne, est supérieure à la valeur correspondant à la tension de sortie maximale de l'antenne. Cette antenne est en outre caractérisée en ce que la valeur de cette capacité parasite C3 est sélectionnée de sorte que le rapport signal/bruit dans la plage inférieure des ondes kilométriques, hectométriques, décamétriques est optimisé par augmentation de la capacité de source de l'amplificateur d'antenne.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19855825 | 1998-12-03 | ||
DE19855825 | 1998-12-03 | ||
DE19936590 | 1999-08-04 | ||
DE19936590A DE19936590A1 (de) | 1998-12-03 | 1999-08-04 | Antennenanordnung mit wenigstens einer Antenne insbesondere auf einer Scheibe eines KFZ's |
PCT/DE1999/003751 WO2000033415A1 (fr) | 1998-12-03 | 1999-11-26 | Ensemble antenne comportant au moins une antenne installee notamment sur une vitre d'un vehicule automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1135828A1 true EP1135828A1 (fr) | 2001-09-26 |
Family
ID=26050542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99962073A Ceased EP1135828A1 (fr) | 1998-12-03 | 1999-11-26 | Ensemble antenne comportant au moins une antenne installee notamment sur une vitre d'un vehicule automobile |
Country Status (4)
Country | Link |
---|---|
US (1) | US6593889B1 (fr) |
EP (1) | EP1135828A1 (fr) |
JP (1) | JP4327366B2 (fr) |
WO (1) | WO2000033415A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8545974B2 (en) * | 2005-02-09 | 2013-10-01 | Laird Technologies, Inc. | Flame retardant EMI shields |
WO2013063207A1 (fr) | 2011-10-28 | 2013-05-02 | Corning Incorporated | Articles en verre à réflectivité infrarouge et leurs procédés de fabrication |
CN107531562B (zh) | 2015-04-30 | 2021-05-28 | 康宁股份有限公司 | 具有离散的金属银层的导电制品及其制造方法 |
DE102017213374B3 (de) * | 2017-08-02 | 2018-10-11 | Audi Ag | Antennenanordnung für ein Fahrzeug |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1600987A (en) * | 1977-08-17 | 1981-10-21 | Bsh Electronics Manchester Ltd | Electrical device to enable the heating element of an electrically heated motor vehicle window to be used as a radio transmitting aerial |
JPS5947882B2 (ja) * | 1978-04-11 | 1984-11-22 | 旭硝子株式会社 | 自動車のアンテナガラス |
DE3410415A1 (de) | 1984-03-21 | 1985-09-26 | Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker | Aktive antenne in der heckscheibe eines kraftfahrzeugs |
US4803492A (en) * | 1985-11-25 | 1989-02-07 | Central Glass Company, Limited | Vehicle window glass antenna |
JPH04249405A (ja) * | 1991-02-05 | 1992-09-04 | Harada Ind Co Ltd | 自動車用ガラスアンテナ |
US5548298A (en) | 1992-02-05 | 1996-08-20 | Harada Kogyo Kabushiki Kaisha | Glass antenna for automobiles |
US5790079A (en) * | 1995-11-22 | 1998-08-04 | Delco Electronics Corporation | Backlite antenna for AM/FM automobile radio |
JP3608890B2 (ja) | 1996-12-06 | 2005-01-12 | セントラル硝子株式会社 | 自動車用ガラスアンテナ |
TW423180B (en) * | 1997-01-31 | 2001-02-21 | Terajima Fumitaka | Glass antenna device for an automobile |
US6130645A (en) * | 1998-01-14 | 2000-10-10 | Fuba Automotive Gmbh & Co. Kg | Combination wide band antenna and heating element on a window of a vehicle |
US6215450B1 (en) * | 1998-06-03 | 2001-04-10 | Nippon Sheet Glass Co., Ltd. | Glass window antenna system for motor vehicles |
JP2000151248A (ja) * | 1998-11-16 | 2000-05-30 | Nippon Sheet Glass Co Ltd | 車両用ガラスアンテナ装置 |
-
1999
- 1999-11-26 WO PCT/DE1999/003751 patent/WO2000033415A1/fr not_active Application Discontinuation
- 1999-11-26 US US09/857,336 patent/US6593889B1/en not_active Expired - Fee Related
- 1999-11-26 EP EP99962073A patent/EP1135828A1/fr not_active Ceased
- 1999-11-26 JP JP2000585959A patent/JP4327366B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0033415A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP4327366B2 (ja) | 2009-09-09 |
US6593889B1 (en) | 2003-07-15 |
JP2002531982A (ja) | 2002-09-24 |
WO2000033415A1 (fr) | 2000-06-08 |
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Legal Events
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17Q | First examination report despatched |
Effective date: 20050415 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 20061210 |