EP0124055B1 - Antenne active adhérant au pare-brise d'un véhicule pour toutes les sortes de polarisation - Google Patents
Antenne active adhérant au pare-brise d'un véhicule pour toutes les sortes de polarisation Download PDFInfo
- Publication number
- EP0124055B1 EP0124055B1 EP84104520A EP84104520A EP0124055B1 EP 0124055 B1 EP0124055 B1 EP 0124055B1 EP 84104520 A EP84104520 A EP 84104520A EP 84104520 A EP84104520 A EP 84104520A EP 0124055 B1 EP0124055 B1 EP 0124055B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aerial
- amplifier
- windscreen
- active
- metallic frame
- 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.)
- Expired - Lifetime
Links
Images
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Definitions
- the invention relates to an active windshield antenna for motor vehicles for VHF and LMK radio reception according to the preamble of claim 1.
- the antenna due to the integration into the vehicle body, meets vehicle-specific requirements such as mechanical robustness, long service life, easy installation, avoidance of unnecessary air swirling much better than the standard rod antenna.
- Active windshield antennas with the properties described above are known for example from DE-GM 78 08 489.
- a motor vehicle antenna which is designed according to this prior art, in the case of vertically or circularly polarized waves, types of polarization such as those e.g. are frequently used in the USA for VHF broadcasting, only provides extremely unsatisfactory reception powers, while the reception powers in the FM range with horizontal polarization and in the LMK range are at least equivalent to those of the standard antenna.
- Another disadvantage is the position of the antenna amplifier that is predetermined for the antenna to function properly. A change in the antenna configuration shown in Figure 1 of DE-GM 78 08 489 by changing the connection point leads to poorer reception properties, particularly in the FM range.
- the invention is based on the object of realizing an active windshield antenna according to the preamble of claim 1, the reception power of which has good reception properties both in the case of horizontally and also in the case of vertically and circularly polarized VHF reception field and in the vertically polarized LMK range, and the requirement being met should also be that the mounting point for the amplifier near the metal frame can be freely chosen with regard to vehicle-specific aspects.
- An antenna arrangement has also become known (FR-A-2 513 021) which, although it is a two-band antenna, is not an active antenna of the type described.
- This known antenna arrangement is always composed of two sections, namely a section for frequency modulation (FM) and a section for amplitude modulation (AM), these two sections being connected to one another in series. The sections are separated by an inductor, the inductor acting as an open circuit for the FM range and a short circuit for the AM range.
- the known antenna arrangement is therefore not able to achieve the described task without this separation by the inductance, namely to achieve the desired reception results. It is also essential that an antenna amplifier, as required by an active antenna, is not present in this known antenna arrangement. This also contradicts a solution to the task described.
- Such an antenna has the particular advantage of delivering very good reception results with horizontal as well as with vertical and circular polarization in the FM range.
- the antenna according to the invention delivers good results in all types of polarization.
- FR-A-2 513 021 there is a significant difference in the omission of the division of the antenna configuration into a conductor section for the FM range and one for the AM range, with the advantage thereby achieved of the uniformity of the antenna conductors for FM and AM reception.
- the location for the antenna connection point and the amplifier is predetermined by vehicle-specific constraints.
- the constraints often result from the assembly sequence in the manufacture of the motor vehicle and from the requirement that the antenna amplifier be exchangeable and retrofitted.
- the reception properties that can be achieved are largely independent of the specified installation location.
- a comparison of the conductor or wire length with a view to adapting to the current vehicle body or windshield opening is largely unproblematic with the given conductor configuration.
- Fig. 1 shows the front window of the vehicle with a view from the passenger compartment.
- the antenna amplifier 5 is attached in the vicinity of the metal frame 2 and is connected at its ground point to the metal frame of the windshield via the connection 8 (input connection).
- the antenna amplifier 5 has at its input a branching of the transmission paths for signal components from the FM frequency range and the LMK frequency range.
- a signal branch is e.g. known from DE-PS 21 15 657 or from DE-PS 21 66 898 or DE-PS 19 19 749.
- the transmission path for the LMK frequency range contains an amplifier with a high-impedance input impedance, as is e.g. is known from DE-PS 20 21 331 or DE-PS 25 54 828 or DE-PS 25 54 829.
- the circuit for branching the signals does not load the input impedance of the LMK amplifier in the LMK frequency range with a low impedance, so that the input impedance of the overall amplifier 5 in the LMK frequency range is overall high impedance.
- the output line 6 of the antenna amplifier 5 is led to a receiver 7.
- the first input terminal 3 of the antenna amplifier 5 is connected to the one end of the antenna conductor 4a, 4b via the shortest possible connecting line.
- the interaction of the conductor configuration given by the antenna conductors 4a and 4b with the LMK amplifier 10 is explained below.
- the conductor 4b makes the essential contribution to reception. In the interest of good reception in the LMK area, the conductor 4b should not be chosen too short and if possible use the full pane height. Although the reception field strength in the lower part of the conductor 4b is opposite to the field strength in the upper part 4a, the full conductor length is preferable from the point of view of the LMK reception due to the associated increased capacitance.
- This contribution is due to the high concentration of the electric field lines in the vicinity of the metal frame 2, which brings about a noticeable improvement in reception even when the conductor 4a is at a small distance from the metal frame 2. This makes it possible to choose the distance A of this conductor 4a from the metal frame 2 so small that it does not significantly impair the driver's or passenger's view and the design of the windshield. Distances A significantly less than 10mm between the conductor 4a and the metal frame 2 should, however, be avoided.
- the pane opening 1 enclosed by the conductive frame 2 can be regarded approximately as a slot radiator, which can be optimally excited by a wave with an electrical field strength vector oriented in the direction of the vertical line of symmetry 9.
- a resonance-like increase in the field strength along the line of symmetry 9 occurs when the width of the window opening corresponds to approximately half a wavelength, as is usually the case with cars customary today.
- field components in the direction of the symmetry line 9, which excite the disk resonance are present because of the pane inclined in the vehicle.
- a conductor or wire structure such as the conductor part 4b is therefore strongly coupled to the receiving field.
- the coupling of the conductor part 4a can be changed via the distance A, small distances A between the conductor 4a and the frame 2 resulting in low power consumption from the field and large distances A leading to higher power consumption from the field.
- the distance A can therefore also be used to change the ratio of the contributions to reception by the conductor parts 4a and 4b in the FM range.
- the available output power of the structure can be optimized by varying the distance 11 between the end of the vertical conductor part 4b and the frame 2, the maximum possible length often being found to be the optimal length for all polarizations.
- the distance 11 should not be less than approx. 2 mm.
- the optimal distance 11 between the end of the conductor part 4b and the frame 2 must be found by the fact that for different distances 11 through longer measurement runs with statistical travel routes, the mean antenna output voltage resulting from the input resistance of a measurement receiver structure under investigation compared to the average output voltage of the reference antenna is determined. After measuring the impedance of the conductor or wire structure, this voltage across a load resistor that is not matched to the power must then be converted to the available average output power, that is to say to the power that would have been achievable with a respective power-matched load.
- the optimum distance 11 is when this available signal power is at a maximum, the value of the impedance of the conductor or wire structure itself being almost insignificant, since low-loss transformation circuits can be used in the antenna amplifier 5 within the transmission path for the FM frequency range 13.
- Such transformation circuits are expediently to be designed such that noise adaptation for the input transistor is achieved if an active, amplifying three-pole element such as a field effect transistor or a bipolar transistor is used in the transmission path 13, or it is necessary to adapt the power to the characteristic impedance of the connecting cable 6 to the receiver 7, if the transmission path 13 is passive.
- Fig. 2 shows an advantageous embodiment of the invention, in which the antenna amplifier 5 and the antenna connector are located near the lower right corner of the metal frame and the break point 12 is located near the upper horizontal part of the metal frame and the conductor 4a parallel to right and to the horizontal upper part of the metal frame.
- the amplifier is mounted in the area of the dashboard, an area in which there is often enough space and which is usually also easily accessible for retrofitting an antenna or for replacing the antenna amplifier. It is also advantageous at this installation location that only a relatively short connecting cable to the receiver is required.
- FIG. 4 shows an embodiment of the invention with the same mounting point for the amplifier as in FIG. 2, but with a minimized conductor or wire length on the disk and, compared to the structure according to FIG. 2, a simple geometry of the conductor arrangement with only a single break point , which results in cost advantages in production.
- the risk of interference coupling from the engine compartment to the antenna structure is greater in an embodiment according to FIG. 4 because of the closer proximity of the conductor part 4a to the interference sources such as the ignition. Therefore, such a structure can preferably only be used for vehicles with good interference suppression.
- Fig. 3 shows a likewise advantageous attachment of the amplifier in the upper right corner of the metal frame, an area in which there is often enough space for the antenna amplifier in the right spar or under the vehicle headlining.
- the connecting cable can often simply be led down under the plastic cover with which the metal bar is clad.
- the conductor or wire structure itself has the same advantages as the structure according to FIG. 4, namely the advantage of simplicity and that of inexpensive production, but is not at risk with regard to the coupling in of motor faults.
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Claims (9)
caractérisée en ce que :
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3315458 | 1983-04-28 | ||
DE19833315458 DE3315458A1 (de) | 1983-04-28 | 1983-04-28 | Aktive windschutzscheibenantenne fuer alle polarisationsarten |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0124055A2 EP0124055A2 (fr) | 1984-11-07 |
EP0124055A3 EP0124055A3 (en) | 1987-05-27 |
EP0124055B1 true EP0124055B1 (fr) | 1992-10-21 |
EP0124055B2 EP0124055B2 (fr) | 1997-07-23 |
Family
ID=6197618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84104520A Expired - Lifetime EP0124055B2 (fr) | 1983-04-28 | 1984-04-20 | Antenne active adhérant au pare-brise d'un véhicule pour toutes les sortes de polarisation |
Country Status (4)
Country | Link |
---|---|
US (1) | US4602260A (fr) |
EP (1) | EP0124055B2 (fr) |
DE (2) | DE3315458A1 (fr) |
ES (1) | ES8506943A1 (fr) |
Families Citing this family (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4928108A (en) * | 1983-12-20 | 1990-05-22 | Bsh Electronics, Ltd. | Electrical signal separating device having isolating and matching circuitry for split passband matching |
US4903034A (en) * | 1983-12-20 | 1990-02-20 | Bsh Electronics, Ltd. | Electrical signal separating device having isolating and matching circuitry |
US4903035A (en) * | 1983-12-20 | 1990-02-20 | Bsh Electronics, Ltd. | Electrical signal separating device having isolating and matching circuitry |
US4823140A (en) * | 1984-06-18 | 1989-04-18 | Asahi Glass Company Ltd. | Antenna device for a television receiver mounted on an automobile |
JPS6182502A (ja) * | 1984-09-29 | 1986-04-26 | Pioneer Electronic Corp | 車輌用アンテナ装置 |
JPS6269704A (ja) * | 1985-09-21 | 1987-03-31 | Nippon Sheet Glass Co Ltd | アンテナ |
DE3619704A1 (de) * | 1986-06-12 | 1987-12-17 | Lindenmeier Heinz | Antennenanordnung fuer diversityempfang in der fensterscheibe eines kraftfahrzeugs |
US4910796A (en) * | 1986-09-01 | 1990-03-20 | Harada Kogyo Kabushiki Kaisha | Automobile antenna |
US4914447A (en) * | 1986-11-21 | 1990-04-03 | Asahi Glass Company, Ltd. | Antenna for mobile telephone on a glass panel of an automobile |
GB2216341B (en) * | 1988-02-25 | 1992-01-22 | Central Glass Co Ltd | Vehicle window glass antenna suited to reception of fm radio and tv broadcasting |
DE3820229C1 (fr) * | 1988-06-14 | 1989-11-30 | Heinz Prof. Dr.-Ing. 8033 Planegg De Lindenmeier | |
DE3907493A1 (de) * | 1989-03-08 | 1990-09-20 | Lindenmeier Heinz | Scheibenantenne mit antennenverstaerker |
US5019830A (en) * | 1989-03-13 | 1991-05-28 | Harada Kogyo Kabushiki Kaisha | Amplified FM antenna with parallel radiator and ground plane |
DE4041863A1 (de) * | 1990-12-26 | 1992-07-02 | Lindenmeier Heinz | Antennenverstaerkerschaltung fuer aktive hochlineare empfangsantennen mit eingangsseitiger rauschanpassung mit mindestens zwei aktiven dreipolen |
JPH0746016A (ja) * | 1993-07-30 | 1995-02-14 | Nippon Sheet Glass Co Ltd | 自動車電話用窓ガラスアンテナ |
JPH08204443A (ja) * | 1995-01-27 | 1996-08-09 | Nippon Mektron Ltd | 受信用コプレーナ線路給電アクティブアンテナ |
DE19612958A1 (de) * | 1996-04-01 | 1997-10-02 | Fuba Automotive Gmbh | Antennenverstärker auf einer Fensterscheibe |
DE69707636T2 (de) * | 1996-12-20 | 2002-06-20 | Central Glass Co., Ltd. | Fahrzeugseitenfensterantenne für Rundfunkempfang |
US6433835B1 (en) | 1998-04-17 | 2002-08-13 | Encamera Sciences Corporation | Expanded information capacity for existing communication transmission systems |
US20030140351A1 (en) * | 1998-04-17 | 2003-07-24 | Hoarty W. Leo | Cable television system compatible bandwidth upgrade using embedded digital channels |
US20030112370A1 (en) * | 2001-12-18 | 2003-06-19 | Chris Long | Adaptive expanded information capacity for communications systems |
DE19925127C1 (de) * | 1999-06-02 | 2000-11-02 | Daimler Chrysler Ag | Antennenanordnung in Kraftfahrzeugen |
US6239758B1 (en) | 2000-01-24 | 2001-05-29 | Receptec L.L.C. | Vehicle window antenna system |
DE10114769B4 (de) * | 2001-03-26 | 2015-07-09 | Heinz Lindenmeier | Aktive Breitbandempfangsantenne |
US20030219085A1 (en) * | 2001-12-18 | 2003-11-27 | Endres Thomas J. | Self-initializing decision feedback equalizer with automatic gain control |
US7180942B2 (en) | 2001-12-18 | 2007-02-20 | Dotcast, Inc. | Joint adaptive optimization of soft decision device and feedback equalizer |
US6917336B2 (en) * | 2002-01-23 | 2005-07-12 | Dotcast, Inc. | Miniature ultra-wideband active receiving antenna |
US7601130B2 (en) * | 2002-02-25 | 2009-10-13 | Saebo, Inc. | Dynamic hand splint |
WO2004075469A2 (fr) * | 2003-02-19 | 2004-09-02 | Dotcast Inc. | Commande adaptative commune de l'egalisation, de la synchronisation et du gain dans un recepteur de communication numerique |
JP4064978B2 (ja) * | 2004-05-28 | 2008-03-19 | 株式会社デンソー | 車載アンテナの搭載構造 |
US7446719B2 (en) | 2004-05-28 | 2008-11-04 | Denso Corporation | Mobile antenna mounted on a vehicle body |
DE102006039357B4 (de) * | 2005-09-12 | 2018-06-28 | Heinz Lindenmeier | Antennendiversityanlage zum Funkempfang für Fahrzeuge |
DE102007017478A1 (de) * | 2007-04-13 | 2008-10-16 | Lindenmeier, Heinz, Prof. Dr. Ing. | Empfangsanlage mit einer Schaltungsanordnung zur Unterdrückung von Umschaltstörungen bei Antennendiversity |
DE102008031068A1 (de) * | 2007-07-10 | 2009-01-15 | Lindenmeier, Heinz, Prof. Dr. Ing. | Antennendiversityanlage für den relativ breitbandigen Funkempfang in Fahrzeugen |
DE102007039914A1 (de) * | 2007-08-01 | 2009-02-05 | Lindenmeier, Heinz, Prof. Dr. Ing. | Antennendiversityanlage mit zwei Antennen für den Funkempfang in Fahrzeugen |
DE102008003532A1 (de) * | 2007-09-06 | 2009-03-12 | Lindenmeier, Heinz, Prof. Dr. Ing. | Antenne für den Satellitenempfang |
PT2209221T (pt) * | 2009-01-19 | 2018-12-27 | Fuba Automotive Electronics Gmbh | Sistema de recepção para a soma de sinais de antena em fase |
DE102009011542A1 (de) * | 2009-03-03 | 2010-09-09 | Heinz Prof. Dr.-Ing. Lindenmeier | Antenne für den Empfang zirkular in einer Drehrichtung der Polarisation ausgestrahlter Satellitenfunksignale |
DE102009023514A1 (de) * | 2009-05-30 | 2010-12-02 | Heinz Prof. Dr.-Ing. Lindenmeier | Antenne für zirkulare Polarisation mit einer leitenden Grundfläche |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1919749C3 (de) * | 1969-04-18 | 1982-05-13 | Hans Kolbe & Co, 3202 Bad Salzdetfurth | Aktive Empfangsantenne mit Dipolcharakter |
CA960759A (en) * | 1970-02-12 | 1975-01-07 | Shigenobu Esaki | Antenna for vehicle windows |
DE2039076A1 (de) * | 1970-08-06 | 1972-02-10 | Franz Christ | Antenne fuer Kraftfahrzeuge |
DE2115657C3 (de) * | 1971-03-31 | 1983-12-22 | Flachenecker, Gerhard, Prof. Dr.-Ing., 8012 Ottobrunn | Aktive Unipol-Empfangsantenne |
DE2166898C2 (de) * | 1971-03-31 | 1982-08-26 | Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker | Aktive Unipol-Empfangsantenne für den Empfang in zwei durch eine Frequenzlücke getrennten Frequenzbereichen |
GB1417715A (en) * | 1972-11-14 | 1975-12-17 | Triplex Safety Glass Co | Vehicle windscreens |
DE2429628A1 (de) * | 1974-06-20 | 1976-01-08 | Hans Heinrich Prof Dr Meinke | Empfangsantenne fuer kraftfahrzeuge |
US3990072A (en) * | 1974-12-09 | 1976-11-02 | Xerox Corporation | Acoustic residue algebra decoder |
FR2310640A1 (fr) * | 1975-05-06 | 1976-12-03 | Saint Gobain | Antenne de vehicule |
DE7527621U (de) * | 1975-09-01 | 1976-05-20 | Meinke, Hans Heinrich, Prof. Dr., 8035 Gauting | Antenne fuer den rundfunkempfang im kraftfahrzeug |
DE2554829C3 (de) * | 1975-12-05 | 1985-01-24 | Flachenecker, Gerhard, Prof. Dr.-Ing., 8012 Ottobrunn | Aktive Empfangsantenne mit einer gegenkoppelnden Impedanz |
DE7808489U1 (de) * | 1978-03-20 | 1978-10-05 | Flachenecker, Gerhard, Prof. Dr.-Ing., 8012 Ottobrunn | Kraftfahrzeug mit eingebauter Antenne |
IT1138605B (it) * | 1981-09-15 | 1986-09-17 | Siv Soc Italiana Vetro | Antenna multibanda,particolarmente adatta ad una vetratura di autoveicolo |
DE3144287A1 (de) * | 1981-11-07 | 1983-05-19 | Robert Bosch Gmbh, 7000 Stuttgart | Schaltungsanordnung zum empfangen von hochfrequenzsignalen |
-
1983
- 1983-04-28 DE DE19833315458 patent/DE3315458A1/de active Granted
-
1984
- 1984-04-20 EP EP84104520A patent/EP0124055B2/fr not_active Expired - Lifetime
- 1984-04-20 DE DE8484104520T patent/DE3485958D1/de not_active Expired - Lifetime
- 1984-04-26 US US06/604,312 patent/US4602260A/en not_active Expired - Lifetime
- 1984-04-27 ES ES531970A patent/ES8506943A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3315458A1 (de) | 1984-11-08 |
ES531970A0 (es) | 1985-08-01 |
DE3315458C2 (fr) | 1988-06-30 |
EP0124055A3 (en) | 1987-05-27 |
ES8506943A1 (es) | 1985-08-01 |
EP0124055A2 (fr) | 1984-11-07 |
US4602260A (en) | 1986-07-22 |
EP0124055B2 (fr) | 1997-07-23 |
DE3485958D1 (de) | 1992-11-26 |
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