EP2248221A1 - Antennenanordnung für ein kraftfahrzeug - Google Patents
Antennenanordnung für ein kraftfahrzeugInfo
- Publication number
- EP2248221A1 EP2248221A1 EP09715961A EP09715961A EP2248221A1 EP 2248221 A1 EP2248221 A1 EP 2248221A1 EP 09715961 A EP09715961 A EP 09715961A EP 09715961 A EP09715961 A EP 09715961A EP 2248221 A1 EP2248221 A1 EP 2248221A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- motor vehicle
- arrangement according
- further component
- component
- 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
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
Definitions
- the invention relates to an antenna arrangement for a motor vehicle.
- antennas In order to use, for example, radio and TV services in motor vehicles, modern motor vehicles usually have at least one, often even many, possibly also different types of antennas. As a rule, in designing the antennas, an attempt is made to achieve the best possible compromise between antenna efficiency, electromagnetic compatibility with regard to intrinsic disturbance in the vehicle and vehicle design. In modern motor vehicles, for example, antennas are often installed in the rear window, in one of the rear side windows or in the spoiler.
- an antenna arrangement which is completely or partially installed in such a vehicle part, for example, the rear window, comprise a plurality of antennas. It may also include ancillary elements to the antenna (s), such as connectors, amplifiers, chokes, and / or signal processing units (e.g., antenna diversity module). Even components that primarily do not fulfill an antenna function, such as a rear window heater, may be included in the antenna arrangement.
- heating cables of a rear window heater also fulfill an antenna function in addition to their heating function.
- it is known, for example from WO 2005/060044 A1, to suppress the on-board network disturbances transmitted by the heating current to the heating conductors serving as antennas by assemblies with high-frequency high-impedance behavior (so-called blocking circuits or blocking circuit chokes), if the antenna connection point is galvanically connected to the heating field connected is.
- blocking circuits or blocking circuit chokes assemblies with high-frequency high-impedance behavior
- antenna connection point is galvanically connected to the heating field connected is.
- antenna utility currents flow to the supply potential of the voltage supply and / or to the ground potential.
- the object of the invention is to improve the antenna reception of AM antennas used in motor vehicles. This object is achieved by an antenna arrangement with the features of claim 1. Advantageous embodiments and further developments of the invention will become apparent from the dependent claims.
- the antenna arrangement according to the invention has at least one AM antenna for the reception of at least long, medium and / or shortwave signals and at least one further electrically conductive component arranged adjacent to the AM antenna.
- the further component is connected to a ground and / or supply potential of the motor vehicle via at least one filter element. By the filter element signal frequencies are suppressed in at least one of the AM antenna to be received frequency range.
- the invention improves the reception characteristics of the AM antenna in the long, medium and / or shortwave range. Surprisingly, not leading to this technical success filter measures that are directly related to the AM antenna itself, but filter measures that are related to an adjacent component.
- the characteristic reception properties of the AM antenna in the long, medium and / or shortwave range can be selectively changed, e.g. an angle of arrival dependent gain can be achieved.
- AM antennas included in prior art antenna assemblies have suboptimal properties associated with specific market or customer requirements. For example, it is typically of high importance to the North American market to be able to receive radio in very good sound quality over medium wave. However, this customer expectation can not always be met satisfactorily with the above-mentioned compromise between antenna efficiency, electromagnetic compatibility and vehicle design. This is especially true in regions with low transmit signal strength (eg in rural areas).
- the physical nature, in particular the length of the AM antenna installed in the rear, side window or spoiler is then often insufficient for the reception of medium waves. Also unfavorable Framework conditions can complicate or reduce the quality of medium wave reception. In many cases, the above-mentioned typical installation locations on the motor vehicle even do not exist at all.
- deficits in the antenna performance may arise in connection with specific market requirements, for example in the case of unusual frequency bands, field strengths or altered transmitter or geographical typology.
- the invention is particularly suitable for use with AM antennas, the length of which is much smaller than the wavelength of the received signals, since the abovementioned suboptimal properties and / or deficits can occur more frequently in such AM antennas in conventional antenna arrangements.
- the invention is based on the consideration that the reception properties of the AM antenna can be improved by metallic or otherwise electrically conductive components which are directly and / or electrically low impedance connected to the vehicle electrical mass and which are arranged adjacent to the AM antenna, such that the electric vehicle ground for the AM antennas no longer becomes “visible” as ground potential.
- "Visible” is a conductive element in the present context when acting as a parasitic capacitance on the antenna. Such parasitic capacitances attenuate the supply of the antenna signal power to the next stage of the signal chain, which is often designed as an amplifier. The invention prevents such vapor deposition.
- the vehicle mass of a component adjacent to the AM antenna can be made "invisible" to the AM antenna in a particularly simple manner by the adjacent component being made of an electrically nonconductive material, provided this does not impair its function adjacent components - provided this does not impair its function - are electrically isolated from the vehicle mass.
- the invention provides a targeted Befiltem the adjacent component for the to be received by the AM antenna frequency range.
- the adjacent vehicle mass becomes selectively invisible to such frequencies.
- the component can be simultaneously filtered for all higher frequencies. It can then be used as a filter element a low pass.
- the invention is particularly advantageously applicable to antenna arrangements in which the heating wires of a rear window heater run at least partially in the immediate vicinity of the AM antenna. The improvement of the AM reception effected by the invention is particularly clear in such cases.
- the invention is advantageously applicable to antenna arrangements in which another antenna, such as an FM and / or TV antenna is arranged as another component according to the invention at least partially in the immediate vicinity of the AM antenna.
- another antenna such as an FM and / or TV antenna
- both antennas may be mounted on the same rear window. Even in such cases, the invention causes a significant improvement in AM reception.
- the arrangement of the inventively filtered component in a large geometric distance of lying on ground potential parts, lines or other components serve.
- this can also serve a purposeful low-impedance and low-capacitive design of the other terminals of the filtered component and / or a targeted low-impedance and low-capacitive design of possibly required matching circuits of the component.
- the further component can be embodied as a further antenna.
- this antenna is then connected to the ground and / or supply potential of the motor vehicle (in addition to the above-mentioned filter element) via at least one additional filter element, are suppressed by which signal frequencies in at least one of the other antenna to be received frequency range.
- antenna useful currents of the further antenna flow away to the supply potential and / or to the ground potential.
- the antenna arrangement has at least one further electrically conductive component arranged adjacent to the AM antenna, and the filter element has a bifilar coil with a first and a second partial coil.
- the further component is connected to the ground and / or supply potential via the first partial coil of the bifilar coil.
- the further component is connected to the ground and / or supply potential via the second partial coil of the bifilar coil.
- a bifilar coil is to be understood as a two-wire coil wound in opposite directions. Each winding core represents for itself a full-fledged coil, here called part coil.
- the further component mentioned in the preceding paragraph can also be designed as an antenna, in particular FM and / or TV antenna. It can be arranged in a rear window of the vehicle together with the AM antenna and the further component, which can also be designed as an antenna, in particular FM and / or TV antenna.
- the AM antenna, the further component and an optionally present further component of the antenna arrangement are integrated in a rear window of the motor vehicle, it may be advantageous to use the at least one filter element, possibly embodied as a bifilar coil, on the rear shelf or the C To arrange the pillar of the motor vehicle.
- the invention can be implemented in various variants, some of which have already been discussed and others are still to be discussed with reference to the following exemplary embodiments.
- selective and gradual measures can be taken to improve the reception quality. This achieves a fine scalability.
- costs per vehicle are only triggered if the corresponding optional equipment is installed.
- a simply equipped vehicle can thus be equipped with a simple and inexpensive antenna system with little to be installed parts.
- FIG. 1a shows a first partially integrated in a rear window antenna arrangement
- Fig. 2 shows a second partly integrated in a rear window antenna arrangement
- FIG. 3 shows a third partially integrated in a rear window antenna arrangement.
- FIG. 1 a shows an antenna arrangement partially integrated in a rear window 1 of a motor vehicle 10.
- several other antennas are installed in addition to an AM antenna AM.
- These are a total of three FM antennas FM1, FM2 and FM3, three TV antennas TV1, TV2 and TV3, one antenna, an antenna FBD for remote control services and an antenna DAB for digital radio reception.
- Some of the antennas have multiple functions, whereby the taps of the antennas can be used several times and thus reduced in number.
- the FM antenna FM2 is physically identical to the TV antenna TV2.
- the FM antenna FM3 is physically identical to the DAB antenna for digital radio.
- the antennas FM1, FM2, FM3, TV2 and TV 3 act as heating wires of a rear window heater.
- the antenna areas overlap in a known manner (e.g., FM1 with FM2, FM1 with FM3, and TV2 with TV3). Therefore, no limits of the overlapping antennas are shown in the figures.
- Each of the antennas is connected via a feed line to a signal processing unit 2, which may for example comprise an antenna diversity module including amplifier.
- the antennas FM1, FM2, FM3, TV1, DAB, TV2 and TV3, which also act as heating wires of a rear window heater, are connected or connectable to a supply potential 6 via terminals 6a and 6b, respectively, and to a ground potential 5 via connections 5a and 5b , Circling circuits 3 and 4 between the terminals 5a, 5b, 6a, 6b of the antennas and the ground potential 5 or the supply potential 6 suppress any on-board network interference transmitted by the heating current to these antennas and prevent antenna utility currents from flowing to the ground potential 5 or to the supply potential 6.
- signal frequencies are selectively suppressed in typical frequency ranges of electrical system interference.
- either signal frequencies in the frequency range to be received by the respective FM antenna or TV antenna are either suppressed or simplified by means of a low-pass filter.
- a low-pass filter For example, for FM or TV Band I frequencies, this can be designed to be effectively blocking for frequencies above 30 MHz.
- FIG. 1b shows a modified embodiment of the antenna arrangement according to FIG. 1a.
- the blocking circuits 3 and 4 are replaced by filter elements 3 'and 4 1 .
- the filter elements fulfill the above-mentioned objects of the trap circuits 3 and 4, i. They suppress on-board network disturbances and suppress signal frequencies in the frequency range to be received by the respective FM antenna or TV antenna. In addition, however, signal frequencies in at least one frequency range to be received by the adjacent AM antenna AM are also suppressed by the filter elements 3 'and 4'.
- the suppression of the FM / TV frequencies and the suppression of the AM frequencies can be effected by dedicated filtering measures.
- filtering of the adjacent FM / TV antennas by exclusive suppression of signal frequencies in at least one frequency range to be received by the adjacent AM antenna AM is also possible possible, ie without simultaneous suppression of signal frequencies in the frequency range to be received by the respective FM antenna or TV antenna and / or without filtering typical frequency ranges of onboard power supply interference.
- Fig. 2 shows a second partially integrated in a rear window antenna arrangement. It corresponds in detail not described in more detail below to the antenna arrangement from FIG. 1a.
- the bifilar-wound coil 7 can optionally even in combination with Capacitors (eg Lo ESR types) already achieve a filtering effect, which additionally benefits the goal of increased reception performance.
- the bifilar coil 7 can effect a blockage of both AM frequencies and FM / TV frequencies, independently of the effect of the blocking circuits 3 and 4.
- the ground-side connection of the respective sub-coil of the bifilar coil 7 can then be connected directly to the vehicle ground or led to the blocking circuit 3 or 4 (corresponds to the case shown in FIG. 2), but only looped through to the vehicle mass.
- the bifilar coil 7 can be designed such that only in cooperation with the blocking circuit 3 results in the desired filtering effect.
- the effect of the bifilar coil 7 is then limited to the AM filtering, while the FM / TV filtering is performed in a conventional manner by the blocking circuit 3 or 4.
- the concentration of the AM filtering on the bifilar coil 7 provided as a dedicated component according to this second variant allows a selective provision of the AM filtering by selective incorporation of the bifilar coil.
- AM filtering may be provided in a market or area specific manner or at the explicit request of the buyer of an automobile.
- the modular principle aimed at for cost and efficiency reasons in automotive development is supported by this second variant.
- the use of blocking circuits and / or a bifilar coil conceivable for realizing the invention still other forms of filtering.
- the region which is filtered according to the invention and adjacent to the actual AM antenna can also be separated from other ground paths in another way. In the specific case, this can be done by
- such adaptation circuits can be implemented for further antenna taps via the smallest possible series capacitance.
- the input adaptation of a possible antenna amplifier can be designed specifically so that its series capacity is kept small.
- the heating cables may pass through a high inductance coil close to or on the disc so that their (parasitic) capacitance to ground at the amplifier input is minimized.
- FIG. 3 shows a further antenna arrangement according to the invention, which is partially integrated in a rear window. It corresponds in detail not described in more detail below to the antenna arrangement from FIG. 1a.
- the antenna arrangement according to FIG. 3, however, comprises antenna amplifiers 8 and 9 for the TV antennas TV2 and TV3.
- the antenna amplifier 8 is integrated into the housing of the blocking circuit 3
- the antenna amplifier 9 is integrated into the housing of the blocking circuit 4.
- the integration of the antenna amplifiers in the pincushion housings can be independent of the filtering of the antennas adjacent to the AM array with respect to signal frequencies in the frequency range to be received by the AM antenna, if a pinning circuit is already for filtering the FM antennas with respect to signal frequencies in the FM antenna receiving frequency range or in terms of electrical system interference is provided.
- an antenna arrangement for a motor vehicle comprising at least one antenna for the reception of signals in a specific frequency range and at least one further electrically conductive component arranged adjacent to the antenna, is also advantageous the further component is connected to a ground and / or supply potential of the motor vehicle via at least one filter element, by means of which signal frequencies in the specific frequency range are selectively or selectively suppressed.
Landscapes
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008011131A DE102008011131A1 (de) | 2008-02-26 | 2008-02-26 | Antennenanordnung für ein Kraftfahrzeug |
| PCT/EP2009/001003 WO2009106235A1 (de) | 2008-02-26 | 2009-02-13 | Antennenanordnung für ein kraftfahrzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2248221A1 true EP2248221A1 (de) | 2010-11-10 |
| EP2248221B1 EP2248221B1 (de) | 2019-04-10 |
Family
ID=40497604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09715961.0A Active EP2248221B1 (de) | 2008-02-26 | 2009-02-13 | Antennenanordnung für ein kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8253637B2 (de) |
| EP (1) | EP2248221B1 (de) |
| CN (1) | CN101911377B (de) |
| DE (1) | DE102008011131A1 (de) |
| WO (1) | WO2009106235A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5720308B2 (ja) * | 2010-06-16 | 2015-05-20 | セントラル硝子株式会社 | 車両用ガラスアンテナ |
| US11786146B1 (en) | 2012-09-25 | 2023-10-17 | Micro Mobio Corporation | Wireless hub system and method |
| US12138041B1 (en) | 2012-09-25 | 2024-11-12 | Micro Mobio Corporation | Mobile device case with satellite communication capability |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5548298A (en) * | 1992-02-05 | 1996-08-20 | Harada Kogyo Kabushiki Kaisha | Glass antenna for automobiles |
| JPH0758534A (ja) * | 1993-08-20 | 1995-03-03 | Nippon Sheet Glass Co Ltd | 窓ガラスアンテナ |
| JP3562980B2 (ja) * | 1998-03-11 | 2004-09-08 | 日本板硝子株式会社 | 車両用ガラスアンテナ装置 |
| US6215450B1 (en) * | 1998-06-03 | 2001-04-10 | Nippon Sheet Glass Co., Ltd. | Glass window antenna system for motor vehicles |
| DE19854169A1 (de) * | 1998-11-24 | 2000-05-25 | Heinz Lindenmeier | Fensterscheibenantenne mit hochfrequent hochohmig angeschlossenem Heizfeld |
| JP2001308624A (ja) * | 2000-04-21 | 2001-11-02 | Sanwa Newtec Co Ltd | 無線周波機器の電波干渉抑制方法 |
| JP2001320293A (ja) * | 2000-05-11 | 2001-11-16 | Asahi Glass Co Ltd | 自動車用ガラスアンテナ装置 |
| DE10234851A1 (de) * | 2002-07-31 | 2004-02-12 | Robert Bosch Gmbh | Fahrzeug-Antennenanordnung für den Empfang von LMK-, UKW- und TV-Signalen |
| DE10350780A1 (de) * | 2003-10-30 | 2005-06-02 | Robert Bosch Gmbh | Fahrzeugscheibenantenne |
| DE10359223A1 (de) | 2003-12-17 | 2005-07-21 | Robert Bosch Gmbh | Fahrzeugscheibenantenne |
| DE202006016379U1 (de) * | 2006-10-20 | 2007-03-08 | Fuba Automotive Gmbh & Co. Kg | Antennenanordnung in einer Windschutzscheibe eines Kraftfahrzeugs |
-
2008
- 2008-02-26 DE DE102008011131A patent/DE102008011131A1/de not_active Withdrawn
-
2009
- 2009-02-13 EP EP09715961.0A patent/EP2248221B1/de active Active
- 2009-02-13 CN CN200980101540.6A patent/CN101911377B/zh active Active
- 2009-02-13 WO PCT/EP2009/001003 patent/WO2009106235A1/de not_active Ceased
-
2010
- 2010-06-29 US US12/825,891 patent/US8253637B2/en active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009106235A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009106235A1 (de) | 2009-09-03 |
| CN101911377A (zh) | 2010-12-08 |
| EP2248221B1 (de) | 2019-04-10 |
| CN101911377B (zh) | 2014-02-05 |
| US8253637B2 (en) | 2012-08-28 |
| DE102008011131A1 (de) | 2009-09-10 |
| US20100265144A1 (en) | 2010-10-21 |
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