EP1698019A1 - Vehicle windshield-integrated antenna - Google Patents

Vehicle windshield-integrated antenna

Info

Publication number
EP1698019A1
EP1698019A1 EP04820446A EP04820446A EP1698019A1 EP 1698019 A1 EP1698019 A1 EP 1698019A1 EP 04820446 A EP04820446 A EP 04820446A EP 04820446 A EP04820446 A EP 04820446A EP 1698019 A1 EP1698019 A1 EP 1698019A1
Authority
EP
European Patent Office
Prior art keywords
heating
antenna
conductor
reception
vehicle window
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
Application number
EP04820446A
Other languages
German (de)
French (fr)
Other versions
EP1698019B1 (en
Inventor
Rainer Kuehne
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.)
Continental Advanced Antenna GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1698019A1 publication Critical patent/EP1698019A1/en
Application granted granted Critical
Publication of EP1698019B1 publication Critical patent/EP1698019B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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 is based on a vehicle window antenna with a heating field, which is provided both for VHF reception and for LMK reception.
  • the heating field of the window is often used as the antenna structure.
  • the heating field for VHF and TV reception is provided in US 6,498,588 B1 and W099 / 66587.
  • a conductor loop is also provided on the upper edge of the pane, which is not connected to the heating field.
  • a major disadvantage of such an arrangement is the need for an area, e.g. in the upper area of the window pane, which cannot be heated due to the lack of a heating conductor and therefore cannot be defrosted.
  • the resulting heatable area is inadmissibly small.
  • the heat conductors run essentially horizontally and essentially parallel to the metallic boundaries of the disk.
  • the electrical system disturbances transmitted from the heating current to the heating conductors serving as antennas must be suppressed by modules with high-frequency high-impedance behavior if the antenna connection point is galvanically connected to the heating field.
  • these are, for example, rod chokes that are integrated in the line parts supplying the heating current and are usually located near the heating current connections of the heating field.
  • LMK reception this is a current-compensated toroidal choke (AM blocking circuit), which is also arranged in the heating current supply.
  • AM blocking circuit is a very cost-intensive assembly, whose weight, approx.
  • the reception of LMK and various VHF signals with line structures is realized in one or more window panes, which are usually in the immediate vicinity but are spatially separated.
  • a major disadvantage of such an arrangement is the need for at least two, usually fixed window panes, which results in an increased effort in the manufacture of the panes, in the electronic design of connected, usually active circuit components and in the assembly of corresponding circuit carriers.
  • Antenna arrangements are also known which use antennas for LMK and VHF
  • the measures according to claim 1 ie with a heating conductor field, which is provided both for VHF and possibly TV reception and for LMK reception with a single disc, at least one decoupling element being provided for at least LMK reception, which is not galvanically connected to the heating field in terms of radio frequency and the decoupling element is arranged in the heating conductor field, in particular between two adjacent heating conductors, it is possible to receive LMK and, in particular, diversified VHF / TV signals with a single window pane, without having to rely on a complete one The entire pane is not heated, especially in the area not covered by black printing must become.
  • the necessary filter elements for the LMK Rundfiink can be dispensed with or the filter elements can be assembled with significantly less effort than with previous systems. This means that there is no need for a separate examination of the mechanical load on this assembly, and the quality of the system over the life of the vehicle is inexpensive
  • Filter assemblies can be guaranteed.
  • the basic noise of the antenna for the LMK radio reception can be significantly reduced if filter elements for the LMK range are retained.
  • the line structure is applied to a window pane by conventional methods, it being irrelevant in the sense of the invention whether it is a pane safety glass or laminated safety glass.
  • Said window pane is surrounded by a metallic frame and is usually designed as a rear window of a motor vehicle.
  • the arrangement described can also be applied to any other disc, e.g. for ships.
  • the particular advantage of the invention lies in the fact that either no special filter elements for the decoupling of the LMK antenna function from the vehicle electrical system interference in the form of a current-compensated toroidal choke (high-frequency high-impedance component) are necessary, or that
  • an outcoupling element preferably an additional conductor or an additional conductor loop
  • an additional conductor or an additional conductor loop is inserted between two heating conductors in parallel, usually between the top two, because the technical performance of the receiving system is optimal, so that no galvanic Connection between this conductor and the heating field exists. Due to the non-galvanic connection, electrical system disturbances have little influence on the noise floor of the antenna.
  • the heating field and additional conductor are so low for LMK frequencies that on-board electrical system faults in the heating current do not or only crosstalk.
  • the capacitive coupling for FM and TV frequencies is, however, sufficiently high that the antenna signals are received with the entire heating conductor structure. Filter elements are necessary here.
  • the antenna function is due to the high capacitive Coupling comparable to an arrangement in which the antenna connection point is electrically connected to the heating field.
  • the entire pane can be heated since no structures outside the heating conductor field are necessary.
  • FIG. 1 shows an integrated antenna system for LMK, VHF and possibly TV reception according to the invention
  • FIG. 2 shows a further exemplary embodiment with a further VHF / TV antenna signal coupling
  • FIG. 3 shows a comparison of the reception pcgcl in the LMK frequency range.
  • Figure 1 shows a disc antenna consisting of parallel to each other
  • the heating conductor field formed in this way is supplied with heating current in each case via an FM / TV choke 5 in the supply lines (Ub heater).
  • an AM blocking circuit 13 with more or less complex filter effort is provided in the supply lines for the heating current or not.
  • Antenna connection point 1 for VHF / TV and LMK signals is galvanically connected to a coupling element 6 in the heating conductor field but not to the heating conductor field.
  • the decoupling element 6 can be designed as a straight conductor, as an open conductor loop as shown in FIG. 1, or as a closed conductor loop or from combinations of the latter elements. A structure that is as long as possible is advantageous.
  • the Coupling element 6 is arranged in particular between two adjacent heating conductors 3 and runs parallel (leg of the open conductor loop) to the entire length of two heating conductors 3. The distance of the coupling element 6 or its conductor pieces parallel to the heating conductors 3 should be as small as possible, so that a capacitive Coupling for FM / TV frequencies is ensured.
  • connection of the active antenna module 7 is advantageously located in the immediate vicinity of the antenna connection point 1 in the upper right corner of the heating conductor field on the metallic frame 8 surrounding the window pane (shown in dashed lines).
  • the heat conductor structure of the pane is thus formed, e.g. through additional vertical
  • Crossing lines 10 which are galvanically connected to the parallel heating conductors 3 at each crossing point and are located on the equipotential points formed by the voltage distribution, so that a resonant structure is created at the antenna connection point 1 for VHF frequencies.
  • the decoupled antenna signals are amplified separately in the electronic assembly 7 (AM, FM, TV1) and, if necessary, filtered and fed to the TV tuner 11 or radio 12.
  • FIG. 2 shows a further embodiment in which a further VHF / TV
  • Antenna signal decoupling is formed from the antenna connection point 2, which is galvanically connected to the heating field on the opposite side, and a closely adjacent ground connection. This then forms a two-antenna system.
  • Other antennas can also be formed in the same way from the heating field elsewhere, e.g. two additional ones in order to generate a four-antenna system.
  • Another FM or TV area can be covered, a second FM receiver can be operated, or a diversity effect can be exploited by different reception signals at the two antenna connection points 1 and 2, as e.g. can occur under unfavorable reception conditions in mobile use.
  • the decisive factor is the capacity of the antenna conductor compared to the vehicle mass.
  • a second electronic module is connected with a certain input capacity, the total capacity of the arrangement based on the antenna connection 1 increases.
  • part of the received LMK signal is diverted to ground via the second module and thus deteriorates the overall reception. This fact is prevented in the antenna arrangement according to the invention.
  • Figure 1 shows the best results achieved.
  • the reception level is slightly lower, but a lower background noise is generated by the heating current.
  • the reception performance for FM / TV reception is comparable to known arrangements.

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  • Details Of Aerials (AREA)

Abstract

The invention relates to a vehicle windshield-integrated antenna in which the heat conductor field (3, 4) is used both for ultrashort wave reception as well as for long, medium and short wave reception. At least one extracting element (6) for long, medium and short wave reception is provided, which is connected in a high-frequency manner but not galvanically to the heat conductor field (3, 4). The extracting element (6) is placed in the heat conductor field, in particular, between two adjacent heat conductors (3).

Description

FahrzeugscheibenantenneVehicle window antenna
Die Erfindung geht aus von einer Fahrzeugscheibenantenne mit einem Heizfeld, welches sowohl für den UKW-Empfang als auch für den LMK-Empfang vorgesehen ist.The invention is based on a vehicle window antenna with a heating field, which is provided both for VHF reception and for LMK reception.
Stand der TechnikState of the art
Bei Fahrzeugantennen wird oft das Heizfeld der Scheibe als Antennenstruktur benutzt. Bei der US 6,498,588 Bl bzw. der W099/66587 ist das Heizfeld für UKW- und TV- Empfang vorgesehen. Für LMK-Empfang ist zusätzlich eine Leiterschleife am oberen Rand der Scheibe, die nicht mit dem Heizfeld verbunden ist, vorgesehen.In vehicle antennas, the heating field of the window is often used as the antenna structure. The heating field for VHF and TV reception is provided in US 6,498,588 B1 and W099 / 66587. For LMK reception, a conductor loop is also provided on the upper edge of the pane, which is not connected to the heating field.
Ein wesentlicher Nachteil einer derartigen Anordnung ist die Notwendigkeit einer Fläche, z.B. im oberen Bereich der Fensterscheibe, die aufgrund fehlender Heizleiter nicht beheizt und damit nicht abgetaut werden kann. Gerade bei PKW mit kleinen Scheiben ist der sich ergebende beheizbare Bereich unzulässig klein.A major disadvantage of such an arrangement is the need for an area, e.g. in the upper area of the window pane, which cannot be heated due to the lack of a heating conductor and therefore cannot be defrosted. In the case of cars with small panes in particular, the resulting heatable area is inadmissibly small.
Die Hcizleiter verlaufen im wesentlichen waagerecht und im wesentlichen parallel zu den metallischen Begrenzungen der Scheibe. Die vom Heizstrom auf die als Antenne dienenden Heizleiter übertragenen Bordnetzstörungen müssen bekanntermaßen durch Baugruppen mit hochfrequenztechnisch hochohmigen Verhalten unterdrückt werden, wenn der Antennenanschlusspunkt galvanisch mit dem Heizfeld verbunden ist. Für den UKW/TV-Empfang sind dies z.B. Stabkemdrosseln, die in den Heizstrom zuführenden Leitungsteilen integriert werden und sich in der Regel in der Nähe der Heizstromanschlüsse des Heizfeldes befinden. Für den LMK-Empfang ist dies eine stromkompensierte Ringkerndrossel (AM- Sperrkreis), die ebenfalls in der Heizstromzuführung angeordnet ist. Dieser AM- Sperrkreis ist eine sehr kostenintensive Baugruppe, deren Eigengewicht, ca. 200 g, zu hohen mechanischen Belastungen sowohl der Leiterplatte als auch der Verschraubungspunkte führt und damit im Rahmen der Qualitätssicherung als äußerst kritisch zu bewerten ist. Die bei normalen Fahrbedingungen auftretenden Vibrationen führen dazu, dass Lötstellen stark beansprucht werden. Bei Kompaktfahrzeugen ist dieser AM-Sperrkreis oftmals in der hinteren Heckklappe angebracht, so dass beim Zuschlagen der Klappe Beschleunigungen von ca. 50 g auftreten können und das gesamte Bauteil von den Verschraubpunkten abreißt.The heat conductors run essentially horizontally and essentially parallel to the metallic boundaries of the disk. As is known, the electrical system disturbances transmitted from the heating current to the heating conductors serving as antennas must be suppressed by modules with high-frequency high-impedance behavior if the antenna connection point is galvanically connected to the heating field. For VHF / TV reception, these are, for example, rod chokes that are integrated in the line parts supplying the heating current and are usually located near the heating current connections of the heating field. For LMK reception, this is a current-compensated toroidal choke (AM blocking circuit), which is also arranged in the heating current supply. This AM blocking circuit is a very cost-intensive assembly, whose weight, approx. 200 g, leads to high mechanical loads on both the printed circuit board and the screw connection points and is therefore to be assessed as extremely critical in the context of quality assurance. The vibrations that occur under normal driving conditions mean that soldering points are put under a lot of stress. In compact vehicles, this AM locking circuit is often installed in the rear tailgate, so that when the flap slams shut, accelerations of approx. 50 g can occur and the entire component is torn off the screwing points.
Bei anderen Fahrzeugantennen-Empfangsanordnungen wird der Empfang von LMK- und divcrsitären UKW-Signalen mit Leitungsstrukturen in einer oder mehreren sich meist in unmittelbarer Nähe befindlichen aber räumlich getrennten Fensterscheiben realisiert. Ein wesentlicher Nachteil einer derartigen Anordnung ist die Notwendigkeit mindestens zwei, meist feststehenden Fensterscheiben, wodurch sich einer erhöhter Aufwand bei der Fertigung der Scheiben, bei der elektronischen Auslegung angeschlossener, meist aktiver Schaltungskomponenten und bei der Montage entsprechender Schaltungsträger ergibt.In other vehicle antenna reception arrangements, the reception of LMK and various VHF signals with line structures is realized in one or more window panes, which are usually in the immediate vicinity but are spatially separated. A major disadvantage of such an arrangement is the need for at least two, usually fixed window panes, which results in an increased effort in the manufacture of the panes, in the electronic design of connected, usually active circuit components and in the assembly of corresponding circuit carriers.
Es sind auch Antennenanordnungen bekannt, die Antennen für den LMK- und UKW-Antenna arrangements are also known which use antennas for LMK and VHF
Empfang aus dem galvanisch kontaktierten Heizfeld bilden. Auch hier sind bordnetzentkoppelnde Filterelemente für Antennenanschlusspunkt und Heizleiter notwendig (EP 0269723 Bl, EP 0382895 Bl).Form reception from the galvanically contacted heating field. Here, too, filter elements decoupling the vehicle electrical system are necessary for the antenna connection point and heating conductor (EP 0269723 B1, EP 0382895 B1).
Vorteile der ErfindungAdvantages of the invention
Mit den Maßnahmen gemäß Anspruch 1, d.h. mit einem Heizleiterfeld, welches sowohl für den UKW- und gegebenenfalls TV-Empfang als auch für den LMK-Empfang mit einer einzigen Scheibe vorgesehen ist, wobei mindestens ein Auskoppelelement für zumindest den LMK-Empfang vorgesehen ist, welches hochfrequenzmäßig jedoch nicht galvanisch an das Heizfeld angeschlossen ist und wobei das Auskoppelelement im Heizleiterfeld, insbesondere zwischen zwei benachbarten Heizleitern angeordnet ist, ist der Empfang von LMK- und insbesondere diversitären UKW/TV-Signalen mit einer einzigen Fensterscheibe möglich, ohne dass auf eine vollständige Beheizung der gesamten Scheibe gerade im nicht durch den Schwarzdruck bedeckten Bereich verzichtet werden muss. Gleichzeitig kann auf die notwendigen Filterelemente für den LMK- Rundfiink verzichtet werden oder die Filterelemente können mit deutlich weniger Aufwand als bei bisherigen Systemen aufgebaut werden. Damit kann auf eine gesonderte Untersuchung der auftretenden mechanischen Belastung dieser Baugruppe verzichtet und die Qualität des Systems über die Fahrzeuglebensdauer bei unaufwändigenWith the measures according to claim 1, ie with a heating conductor field, which is provided both for VHF and possibly TV reception and for LMK reception with a single disc, at least one decoupling element being provided for at least LMK reception, which is not galvanically connected to the heating field in terms of radio frequency and the decoupling element is arranged in the heating conductor field, in particular between two adjacent heating conductors, it is possible to receive LMK and, in particular, diversified VHF / TV signals with a single window pane, without having to rely on a complete one The entire pane is not heated, especially in the area not covered by black printing must become. At the same time, the necessary filter elements for the LMK Rundfiink can be dispensed with or the filter elements can be assembled with significantly less effort than with previous systems. This means that there is no need for a separate examination of the mechanical load on this assembly, and the quality of the system over the life of the vehicle is inexpensive
Filterbaugruppen gewährleistet werden. Das Grundrauschen der Antenne für den LMK- Rundfunkempfang lässt sich bei Beibehaltung von Filterelementen für den LMK-Bereich deutlich vermindern.Filter assemblies can be guaranteed. The basic noise of the antenna for the LMK radio reception can be significantly reduced if filter elements for the LMK range are retained.
Die Leitungsstruktur wird durch gängige Verfahren auf eine Fensterscheibe aufgebracht, wobei es im Sinne der Erfindung unerheblich ist, ob es sich um ein Scheibensicherheitsglas oder Verbundssicherheitsglas handelt. Besagte Fensterscheibe ist durch einen metallischen Rahmen umgeben und meist als Heckscheibe eines Kraftfahrzeuges ausgeführt. Die beschriebene Anordnung kann jedoch auch auf jede andere Scheibe übertragen werden z.B. bei Schiffen.The line structure is applied to a window pane by conventional methods, it being irrelevant in the sense of the invention whether it is a pane safety glass or laminated safety glass. Said window pane is surrounded by a metallic frame and is usually designed as a rear window of a motor vehicle. However, the arrangement described can also be applied to any other disc, e.g. for ships.
Der besondere Vorteil der Erfindung liegt darin, dass entweder keine besonderen Filterelemente für die Entkopplung der LMK-Antennenfünktion von den Bordnetzstörungen in Form einer stromkompensierten Ringkerndrossel (hochfrequenztechnisch hochohmiges Bauelement) notwendig sind oder sich dasThe particular advantage of the invention lies in the fact that either no special filter elements for the decoupling of the LMK antenna function from the vehicle electrical system interference in the form of a current-compensated toroidal choke (high-frequency high-impedance component) are necessary, or that
Grundrauschen bei LMK-Empfang deutlich verringern lässt, wenn Filterelemente für den LMK-Empfang beibehalten werden.Can significantly reduce the background noise in LMK reception if filter elements for LMK reception are retained.
Es wird neben den zur Entrostung dienenden Heizleitern lediglich ein Auskoppelclement vorzugsweise ein zusätzlicher Leiter oder eine zusätzliche Leiterschleife so insbesondere zwischen zwei parallel geführten Heizleitern, in der Regel zwischen den oberen beiden, weil so die technische Performance des Empfangssystems optimal ist, eingefügt, dass keine galvanische Verbindung zwischen diesem Leiter und dem Heizfeld existiert. Aufgrund der nicht galvanischen Verbindung haben Bordnetzstörungen einen geringen Einfluss auf das Grundrauschen der Antenne. Die kapazitive Kopplung zwischenIn addition to the heating conductors used for rust removal, only an outcoupling element, preferably an additional conductor or an additional conductor loop, is inserted between two heating conductors in parallel, usually between the top two, because the technical performance of the receiving system is optimal, so that no galvanic Connection between this conductor and the heating field exists. Due to the non-galvanic connection, electrical system disturbances have little influence on the noise floor of the antenna. The capacitive coupling between
Heizfeld und zusätzlichem Leiter ist für LMK-Frequenzen so gering, dass Bordnetzstörungen im Heizstrom nicht oder nur gering übersprechen. Die kapazitive Kopplung für UKW- und TV-Frequenzen ist allerdings ausreichend hoch, so dass die Antennensignale mit der gesamten Heizleiterstruktur empfangen werden. Hier sind Filterelemente notwendig. Die Antennenfunktion ist aufgrund der hohen kapazitiven Kopplung vergleichbar mit einer Anordnung, bei der der Antennenanschlusspunkt galvanisch mit dem Heizfeld verbunden ist. Außerdem ist die gesamte Scheibe beheizbar, da keine Strukturen außerhalb des Heizleiterfeldes notwendig sind.The heating field and additional conductor are so low for LMK frequencies that on-board electrical system faults in the heating current do not or only crosstalk. The capacitive coupling for FM and TV frequencies is, however, sufficiently high that the antenna signals are received with the entire heating conductor structure. Filter elements are necessary here. The antenna function is due to the high capacitive Coupling comparable to an arrangement in which the antenna connection point is electrically connected to the heating field. In addition, the entire pane can be heated since no structures outside the heating conductor field are necessary.
Ein weiterer Vorteil der erfindungsgemäßen Ausgestaltung liegt in der kostengünstigenAnother advantage of the configuration according to the invention is the cost-effective
Fertigung. Gegenüber anderen Ausführungsformen braucht nur eine einzige Scheibe ausgebildet werden. Ein weiterer Vorteil ist der integrierte und damit einfache Aufbau von passiven oder aktiven Schaltungsteilen, die für die unterschiedlichen Frequenzbänder zwar getrennte Signalpfade vorsehen, aber in einem einzigen Gehäuse angeordnet werden können. Hieraus resultiert neben einem Minimum an mechanischen Komponenten auch eine minimale Verkabelung.Production. Compared to other embodiments, only a single disk needs to be formed. Another advantage is the integrated and thus simple construction of passive or active circuit parts, which provide separate signal paths for the different frequency bands, but can be arranged in a single housing. In addition to a minimum of mechanical components, this also results in minimal wiring.
Zeichnungendrawings
Anahand der Zeichnungen werden Ausführungsbeispiele der Erfindung erläutert. Es zeigenExemplary embodiments of the invention are explained on the basis of the drawings. Show it
Figur 1 ein integriertes Antennensystem für LMK-, UKW- und gegebenenfalls TV- Empfang nach der Erfindung, Figur 2 ein weiteres Ausfuhrungsbeispiel mit einer weiteren UKW-/TV- Antennensignalauskopplung,1 shows an integrated antenna system for LMK, VHF and possibly TV reception according to the invention, FIG. 2 shows a further exemplary embodiment with a further VHF / TV antenna signal coupling,
Figur 3 einen Vergleich des Empfangspcgcls im LMK-Frequenzbereich.FIG. 3 shows a comparison of the reception pcgcl in the LMK frequency range.
Beschreibung von AusführungsbeispielenDescription of exemplary embodiments
Figur 1 zeigt eine Scheibenantenne bestehend aus parallel zueinander angeordnetenFigure 1 shows a disc antenna consisting of parallel to each other
Hcizleitern 3, die jeweils an ihren linken und rechten Enden in eine Sammelschicne 4 münden. Das so gebildete Heizleiterfeld wird jeweils über eine FM-/TV-Drossel 5 in den Zuleitungen mit Heizstrom versorgt (Ub-Heizung). Je nach Akzeptanz des Grundrauschens ist in den Zuleitungen für den Heizstrom ein AM-Sperrkreis 13 mit mehr oder weniger aufwändigem Filteraufwand vorgesehen oder nicht. DerHcizleitern 3, each of which ends at their left and right ends in a collecting table 4. The heating conductor field formed in this way is supplied with heating current in each case via an FM / TV choke 5 in the supply lines (Ub heater). Depending on the acceptance of the background noise, an AM blocking circuit 13 with more or less complex filter effort is provided in the supply lines for the heating current or not. The
Antennenanschlusspunkt 1 für UKW-/TV- und LMK-Signale ist galvanisch mit einem Auskoppelelement 6 im Heizleiterfeld aber nicht mit dem Heizleiterfeld verbunden. Das Auskoppelelement 6 kann als geradliniger Leiter, als offene Leiterschleife wie in Figur 1 dargestellt, oder als geschlossene Leiterschleife oder aus Kombinationen letzterer Elemente ausgeführt sein. Eine möglichst lange Struktur ist vorteilhaft. Das Auskoppelelement 6 ist insbesondere zwischen zwei benachbarten Heizleitern 3 angeordnet und verläuft parallel (Schenkel der offenen Leiterschleife) zur ganzen Länge zweier Heizleiter 3. Der Abstand des Auskoppelelements 6 bzw. dessen Leiterstücke parallel zu den Heizleitern 3 sollte so gering wie möglich sein, damit eine kapazitive Kopplung für UKW-/TV-Frequenzen sichergestellt ist. Der Massepunkt 9 für denAntenna connection point 1 for VHF / TV and LMK signals is galvanically connected to a coupling element 6 in the heating conductor field but not to the heating conductor field. The decoupling element 6 can be designed as a straight conductor, as an open conductor loop as shown in FIG. 1, or as a closed conductor loop or from combinations of the latter elements. A structure that is as long as possible is advantageous. The Coupling element 6 is arranged in particular between two adjacent heating conductors 3 and runs parallel (leg of the open conductor loop) to the entire length of two heating conductors 3. The distance of the coupling element 6 or its conductor pieces parallel to the heating conductors 3 should be as small as possible, so that a capacitive Coupling for FM / TV frequencies is ensured. The earth point 9 for the
Anschluss der aktiven Antennenbaugruppe 7 befindet sich vorteilhaft in unmittelbarer Nähe des Antennenanschlusspunkts 1 in der rechten oberen Ecke des Heizleiterfeldes an dem die Fensterscheibe umgebenden metallischen Rahmen 8 (gestrichelt dargestellt).The connection of the active antenna module 7 is advantageously located in the immediate vicinity of the antenna connection point 1 in the upper right corner of the heating conductor field on the metallic frame 8 surrounding the window pane (shown in dashed lines).
Die Heizleiterstruktur der Scheibe wird so ausgebildet, z.B. durch zusätzliche vertikaleThe heat conductor structure of the pane is thus formed, e.g. through additional vertical
Crossing Lines 10, die an jeder Kreuzungsstelle galvanisch mit den parallelen Heizleitern 3 verbunden sind und sich auf den durch die Spannungsverteilung ausbildenden Äquipotentialpunkten befinden, dass am Antennenanschlusspunkt 1 für UKW- Frequenzen eine resonantc Struktur entsteht.Crossing lines 10, which are galvanically connected to the parallel heating conductors 3 at each crossing point and are located on the equipotential points formed by the voltage distribution, so that a resonant structure is created at the antenna connection point 1 for VHF frequencies.
In der Elektronikbaugruppe 7 werden die ausgekoppelten Antennensignale getrennt verstärkt (AM, FM, TV1) und gegebenenfalls gefiltert und dem TV-Tuner 11 bzw. Radio 12 zugeführt.The decoupled antenna signals are amplified separately in the electronic assembly 7 (AM, FM, TV1) and, if necessary, filtered and fed to the TV tuner 11 or radio 12.
Figur 2 zeigt ein weiteren Ausführungsbeispiel, bei dem eine weitere UKW-/TV-Figure 2 shows a further embodiment in which a further VHF / TV
Antennensignalauskopplung aus dem galvanisch mit dem Heizfeld auf der gegenüberliegenden Seite verbundenen Antennenanschlusspunkt 2 und einem dicht benachbarten Masseanschluss gebildet wird. Hiermit ist dann ein Zweiantennensystem gebildet. Es können an anderer Stelle auch noch weitere Antennen in gleicher Weise aus dem Heizfeld gebildet werden, z.B, noch zwei zusätzliche, um ein Vierantennensystem zu generieren. Es kann damit ein weiterer FM- oder TV -Bereich überstrichen werden, ein zweiter UKW -Empfanger betrieben werden oder aber ein Diversity-Effckt durch unterschiedliche Empfangssignale an den beiden Antennenanschlusspunkten 1 und 2 ausgenutzt werden, wie er z.B. unter ungünstigen Empfangsbedingungen im Mobileinsatz zustande kommen kann.Antenna signal decoupling is formed from the antenna connection point 2, which is galvanically connected to the heating field on the opposite side, and a closely adjacent ground connection. This then forms a two-antenna system. Other antennas can also be formed in the same way from the heating field elsewhere, e.g. two additional ones in order to generate a four-antenna system. Another FM or TV area can be covered, a second FM receiver can be operated, or a diversity effect can be exploited by different reception signals at the two antenna connection points 1 and 2, as e.g. can occur under unfavorable reception conditions in mobile use.
Ein weiterer Vorteil der Erfindung wird an dieser Stelle deutlich: Beim LMK-Empfang kommt es entscheidend auf die Kapazität des Antennenleiters gegenüber der Fahrzeugmasse an. Bei dem System nach dem Stand der Technik wird bei dem Zweiantennen-System durch den Anschluss einer zweiten elektronischen Baugruppe mit einer gewissen Eingangskapazität die Gesamtkapazität der Anordnung bezogen auf den Antennenanschluss 1 erhöht. Mit anderen Worten wird ein Teil des empfangenen LMK-Signals über die zweite Baugruppe gegen Masse abgeleitet und verschlechtert damit den gesamten Empfang. Dieser Umstand wird bei der erfindungsgemäßen Antennenanordnung verhindert.Another advantage of the invention is clear at this point: With LMK reception, the decisive factor is the capacity of the antenna conductor compared to the vehicle mass. In the system according to the prior art, in the two-antenna system, a second electronic module is connected with a certain input capacity, the total capacity of the arrangement based on the antenna connection 1 increases. In other words, part of the received LMK signal is diverted to ground via the second module and thus deteriorates the overall reception. This fact is prevented in the antenna arrangement according to the invention.
Messungen zeigen, dass der Empfang von LMK-Signalen mit der erfindungsgemäßen Anordnung gemäß Figur 1 vergleichbar ist mit einem System, bei dem der Antennenanschlusspunkt galvanisch mit dem Heizfeld an der oberen äußeren Ecke verbunden ist. Dabei stellt es sich ebenfalls heraus, dass eine offene Leiterschlcife wie inMeasurements show that the reception of LMK signals with the arrangement according to the invention according to FIG. 1 is comparable to a system in which the antenna connection point is galvanically connected to the heating field at the upper outer corner. It also turns out that an open conductor loop as in
Figur 1 dargestellt die besten Ergebnisse erzielt. Der Empfangspegel ist zwar geringfügig geringer, dafür wird aber ein geringeres Grundrauschen von dem Heizstrom erzeugt.Figure 1 shows the best results achieved. The reception level is slightly lower, but a lower background noise is generated by the heating current.
Die Empfangsperformance für UKW-/TV-Empfang ist vergleichbar mit bekannten Anordnungen. The reception performance for FM / TV reception is comparable to known arrangements.

Claims

Patentansprüche claims
1. Fahrzeugscheibenantenne mit einem Heizleiterfeld, welches für den UKW- und gegebenenfalls TV-Empfang als auch für den LMK-Empfang vorgesehen ist, wobei mindestens ein Auskoppelelement (6) für zumindest den LMK-Empfang vorgesehen ist, welches hochfrequenzmäßig jedoch nicht galvanisch an das Heizleiterfeld angeschlossen ist, und wobei das Auskoppelelement (6) im Heizleiterfeld, insbesondere zwischen zwei benachbarten Heizleitern (3) angeordnet ist.1. Vehicle window antenna with a heating conductor field, which is provided for VHF and possibly TV reception as well as for LMK reception, at least one decoupling element (6) being provided for at least LMK reception, which is not galvanically connected to the radio frequency Heating conductor field is connected, and wherein the coupling element (6) is arranged in the heating conductor field, in particular between two adjacent heating conductors (3).
2. Fahrzeugscheibenantenne nach Anspruch 1, dadurch gekennzeichnet, dass das Auskoppelelement (6) zusätzlich für den UKW- und gegebenenfalls für den TV- Empfang vorgesehen ist.2. Vehicle window antenna according to claim 1, characterized in that the decoupling element (6) is additionally provided for the FM and possibly for the TV reception.
3. Fahrzeugscheibenantenne nach Anspruch 2, dadurch gekennzeichnet, dass im Heizkreis eine FM-/TV-Drossel (5) vorgesehen ist.3. Vehicle window antenna according to claim 2, characterized in that an FM / TV choke (5) is provided in the heating circuit.
4. Scheibenantenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass im Heizleiterfeld im wesentlichen senkrecht zu den Heizleitern (3) Antennenleiter (10) angeordnet sind, die mit den Heizleitern (3) galvanisch verbunden sind.4. Disc antenna according to one of claims 1 to 3, characterized in that in the heating conductor field substantially perpendicular to the heating conductors (3) antenna conductors (10) are arranged, which are electrically connected to the heating conductors (3).
5. Scheibenantenne nach Anspruch 4, dadurch gekennzeichnet, dass die Antennenleiter (10) bezüglich ihrer Länge und/oder Lage derart ausgebildet sind, dass sich ein resonanzartiges Verhalten der Antenne am Anschlussende (1) des Auskoppelelements (6) im UKW-Bereich einstellt. 5. disc antenna according to claim 4, characterized in that the antenna conductors (10) are designed with respect to their length and / or position such that a resonant behavior of the antenna at the connection end (1) of the decoupling element (6) occurs in the VHF range.
6. Fahrzeugscheibenantenne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Auskoppelelement (6) als geradliniger Leiter, als offene Leiterschleife und/oder als geschlossene Leiterschleife ausgebildet ist.6. Vehicle window antenna according to one of claims 1 to 5, characterized in that the decoupling element (6) is designed as a rectilinear conductor, as an open conductor loop and / or as a closed conductor loop.
7. Fahrzeugscheibenantenne nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sich der Massepunkt (9) für die Auskopplung der LMK- bzw. UKW-/TV- Antennensignale in der Nähe des Anschlussendes (1) des Auskoppelelements (6) befindet.7. Vehicle window antenna according to one of claims 1 to 6, characterized in that the ground point (9) for the decoupling of the LMK or VHF / TV antenna signals is in the vicinity of the connection end (1) of the decoupling element (6).
8. Fahrzeugscheibenantenne nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass mindestens eine weitere UKW-/TV- Antennensignalauskopplung vorgesehen ist, die insbesondere galvanisch mit dem Heizleiterfeld vorzugsweise mit jener Sammelschiene (4) verbunden ist, die entfernt vom Anschlussende (1) des Auskoppelelements (6) gelegen ist.8. Vehicle window antenna according to one of claims 1 to 7, characterized in that at least one further FM / TV antenna signal coupling is provided, which is in particular galvanically connected to the heating conductor field, preferably to that busbar (4) which is remote from the connection end (1) the decoupling element (6) is located.
9. Fahrzeugscheibenantenne nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Abstand des Auskoppelelements (6) bzw. des geradlinigen Leiters/der Leiterschleife zu einem der Heizleiter (3) so nahe gewählt wird, dass eine kapazitive Kopplung für UKW-/TV-Frequenzen mit dem Heizleiter sichergestellt ist. 9. Vehicle window antenna according to one of claims 1 to 8, characterized in that the distance of the decoupling element (6) or the rectilinear conductor / the conductor loop to one of the heating conductors (3) is chosen so close that a capacitive coupling for VHF / TV frequencies with the heat conductor is ensured.
EP04820446.5A 2003-12-17 2004-11-05 Vehicle windshield-integrated antenna Active EP1698019B1 (en)

Applications Claiming Priority (2)

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DE10359223A DE10359223A1 (en) 2003-12-17 2003-12-17 Vehicle window antenna
PCT/EP2004/052836 WO2005060044A1 (en) 2003-12-17 2004-11-05 Vehicle windshield-integrated antenna

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EP1698019A1 true EP1698019A1 (en) 2006-09-06
EP1698019B1 EP1698019B1 (en) 2015-07-29

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BR (1) BRPI0413273B1 (en)
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US20080055169A1 (en) 2008-03-06
DE10359223A1 (en) 2005-07-21
WO2005060044A1 (en) 2005-06-30
US7719475B2 (en) 2010-05-18
BRPI0413273A (en) 2006-10-10
BRPI0413273A8 (en) 2018-05-22
EP1698019B1 (en) 2015-07-29
JP2006524928A (en) 2006-11-02
BRPI0413273B1 (en) 2018-12-11

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