EP1810364A1 - Vehicle screen antenna - Google Patents

Vehicle screen antenna

Info

Publication number
EP1810364A1
EP1810364A1 EP04791197A EP04791197A EP1810364A1 EP 1810364 A1 EP1810364 A1 EP 1810364A1 EP 04791197 A EP04791197 A EP 04791197A EP 04791197 A EP04791197 A EP 04791197A EP 1810364 A1 EP1810364 A1 EP 1810364A1
Authority
EP
European Patent Office
Prior art keywords
reception
vhf
heating
antenna according
antenna
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
Application number
EP04791197A
Other languages
German (de)
French (fr)
Inventor
Markus Hoffmeister
Rainer Kuehne
Michael Thole
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.)
Robert Bosch 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 EP1810364A1 publication Critical patent/EP1810364A1/en
Ceased legal-status Critical Current

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.
  • the heating field of the windshield is often used as the antenna structure.
  • the heating field is provided for FM and TV reception.
  • an additional conductor loop is 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 heating conductors run essentially horizontally and essentially parallel to the metallic boundaries of the pane (chassis).
  • 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 core chokes that are integrated in the heating current-carrying line parts and are usually located in the heating current connections of the heating field. Appropriate installation space must also be provided for this.
  • the reception of LMK and diverse VHF signals with line structures is realized in one or more window panes, which are usually located 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 increases the effort involved in
  • Antenna arrangements are also known which form antennas for LMK and FM reception from the galvanically contacted heating field.
  • filter elements decoupling the vehicle electrical system are necessary in the heating current supply lines (EP 0382895 B1).
  • the measures of the invention i.e. with a heating conductor field, which is provided at least for VHF reception, as well as for LMK reception, whereby at least one decoupling element is provided for VHF reception, which is connected to the heating conductor field in a low-frequency, low-impedance manner but is not galvanically connected LMK and diverse VHF signals with a line structure applied through a single sieve by means of the usual screen printing process in a single window pane are possible without having to do without complete heating of the entire pane, especially in the area not covered by black printing (outer edge of the pane).
  • the line structure is applied to a window pane by conventional methods, it being irrelevant in the sense of the invention whether it is single-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 is that in the case of LMK reception no components are connected to the heating field acting as an antenna, which will be explained in the following.
  • the electronic components connected to receive FM and TV signals can be regarded as a replacement capacity between the antenna connection point and ground. This is around 30-40pF.
  • Heating field is in the range 150-250pF. This capacity is unnecessarily increased by more than 10% by connected electronic components, so that the LMK reception is deteriorated because received signals flow to ground via the electronic assembly. This deterioration in performance cannot be tolerated in areas with high AM usage (e.g. USA, Mexico). Due to a high-frequency, low-impedance but not galvanically contacted decoupling element, the replacement capacity of the connected electronic module for LMK frequencies is not effective and therefore the LMK reception is optimal.
  • Another advantage of the invention lies in the cost-effective 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 in the vehicle and thus a considerable reduction in weight.
  • the invention requires no restrictions with regard to the design of the heating field, it is particularly suitable for use in motor vehicles of all types of panes.
  • FIG. 1 shows a basic circuit diagram of a window antenna according to the invention
  • FIG. 2 shows a pane antenna with two decouplings for VHF reception
  • FIG. 3 shows a disk antenna with a subrack for a plurality of decoupling elements
  • FIG. 4 shows a disk antenna for feeding a diversity switching device
  • FIG. 5 shows a disk antenna with coupling elements for other frequency ranges
  • Figure 6 is a disc antenna with an alternative arrangement of the coupling element.
  • FIG. 1 shows a pane antenna consisting of heating conductors 3 arranged parallel to one another, each of which opens into a busbar 4 at its left and right ends.
  • the heating conductor field thus formed is supplied with heating current via a filter element 5 (Ub heater).
  • the antenna connection point 1 is galvanically connected to the heating conductor field and realizes the LMK reception. The contact is advantageously made at any point, but at the upper outer corner of the heating conductor field.
  • the antenna connection point 2 is electrically connected to a decoupling element 6.
  • Decoupling element 6 preferably consists of a conductor arranged essentially parallel to at least one edge of the heating conductor field, which is not provided by the busbars 4.
  • the decoupling element can also be of any shape, but advantageously consist of a conductor structure consisting of straight line pieces. VHF reception is made possible via the decoupling element 6.
  • Coupling element / conductor structure 6 has a low-frequency, high-frequency connection, but is not galvanically connected to the heating conductor field. It is important to ensure that the capacitive coupling between the conductor structure 6 and the metallic frame 8 surrounding the window pane is low enough for good reception behavior.
  • the formation of the conductor structure, the length of the preferably rectilinear conductor pieces and / or the geometrical position are designed such that a resonant impedance behavior forms at the antenna connection point 2 in the VHF frequency range.
  • high-frequency low-resistance but not galvanically coupled the following is always meant: For TV and FM frequencies, the coupling between the heating field and the decoupling element is as large as possible (S21 ⁇ 5 dB), for LMK-
  • the coupling is as low as possible (S21> 15 dB).
  • the VHF / TV filter elements required in the case of a galvanically contacted heating field can also be dimensioned smaller and thus become more cost-effective or even be omitted entirely.
  • a plurality of essentially vertical animate conductors 9 can also be provided, which are galvanically connected to the heating conductors 3 at equipotential points of the voltage distribution that is being formed.
  • the length of the antenna conductor 9 and / or its geometric position is determined by the fact that a resonance-like behavior of the antenna
  • the resonance behavior of the decoupling element 6 and the anteimate conductor 9 can be coordinated with one another by a targeted offset of the resonance frequencies in such a way that, as with two mutually detuned bandpass filters, a much broader resonance increase occurs overall, as in the case of a single filter. This means that the entire VHF range can be covered with regard to the excessive resonance.
  • FIG. 2 shows a disk antenna constructed as in FIG. 1, with the difference that two decoupling elements 6 are now arranged on the upper edge of the heating conductor field to the left and right of each other together with their electronic assemblies 7.
  • a further FM range can thus be covered, a second VHF receiver can be operated, or a diversity effect can be exploited by means of different received signals on the two decoupling elements 6, as e.g. can occur under unfavorable reception conditions in mobile use.
  • FIG. 3 shows a pane antenna according to the invention in which the antenna connection points 1 for LMK reception and 2 for FM reception are routed to a common mechanical component as the carrier for the electronic modules (common module rack 10). With this design, the mechanical complexity of the antenna system is minimized.
  • decoupling elements 6 are provided for FM and one for LMK.
  • This configuration is suitable e.g. to supply a diversity switching device with four different antenna signals.
  • a plurality of decoupling elements 61, 62 and 63 are provided, which are galvanically interconnected at their connection point 2.
  • the decoupling element / conductor 61 for VHF reception and the further, in particular shorter, decoupling elements 62, 63 can be used for TV reception in VHF or UHF range can be provided.
  • the decoupling elements 61, 62, 63 of different lengths preferably run parallel to one another.
  • FIG. 6 shows a further pane antenna according to the invention.
  • the antenna connection point 1 leads to an electronic assembly for LMK and FM
  • a second antenna is formed by means of the coupling-out element 6 and fed to a further electronic assembly via the antenna connection point 2.
  • the capacitive loading of the antenna is optimized in the case of LMK reception, because the second of the electronic modules is connected at LMK frequencies with high-frequency technology.
  • the described invention also applies accordingly to differently designed heating conductor fields, e.g. the heating conductors do not run horizontally but vertically.

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  • Details Of Aerials (AREA)

Abstract

The invention relates to a vehicle screen antenna comprising a heating conductor field that is designed for both VHF reception and LMS reception. According to the invention, the antenna is equipped with a decoupling element (6) for the VHF reception, which is connected to the heating conductor field at high-frequency with a low-impedance, but is not galvanically connected to said field.

Description

FahrzeugscheibenantenneVehicle window antenna
Die Erfindung geht aus von einer Fahrzeugscheibenantenne.The invention is based on a vehicle window antenna.
Stand der TechnikState of the art
Bei Fahrzeugscheibenantennen wird oft das Heizfeld der Scheibe als Antennenstruktur benutzt. Bei der US 6,498,588 Bl ist das Heizfeld für UKW- und TV-Empfang vorgesehen. Für LMK-Empfang ist eine zusätzliche Leiterschleife am oberen Rand der Scheibe, die nicht mit dem Heizfeld verbunden ist, vorgesehen.In vehicle windshield antennas, the heating field of the windshield is often used as the antenna structure. In US 6,498,588 B1, the heating field is provided for FM and TV reception. For LMK reception, an additional conductor loop is provided on the upper edge of the pane, which is not connected to the heating field.
Ein wesentlicher Nachteil einer derartigen Anordnung ist in 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 Heizleiter verlaufen im wesentlichen waagerecht und im wesentlichen parallel zu den metallischen Begrenzungen der Scheibe (Chassis). 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.The heating conductors run essentially horizontally and essentially parallel to the metallic boundaries of the pane (chassis). 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.
Für den UKW-Empfang sind dies z.B. Stabkerndrosseln, die in den heizstromführenden Leitungsteilen integriert werden und sich in der Regel der Heizstromanschlüsse des Heizfeldes befinden. Hierfür muss außerdem entsprechender Bauraum zur Verfügung gestellt werden. Bei anderen Fahrzeugantennen- Empfangsanordnungen wird der Empfang von LMK- und diversitären 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 ein erhöhter Aufwand bei derFor VHF reception, these are, for example, rod core chokes that are integrated in the heating current-carrying line parts and are usually located in the heating current connections of the heating field. Appropriate installation space must also be provided for this. In other vehicle antenna reception arrangements, the reception of LMK and diverse VHF signals with line structures is realized in one or more window panes, which are usually located 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 increases the effort involved in
Fertigung der Scheiben, bei der elektronischen Auslegung angeschlossener, meist aktiver Schaltungskomponenten und bei der Montage entsprechender Schaltungsträger ergibt.Manufacture of the panes, in the electronic design of connected, mostly active circuit components and in the assembly of corresponding circuit carriers.
Es sind auch Antennenanordnungen bekannt, die Antennen für den LMK- und UKW- Empfang aus dem galvanisch kontaktierten Heizfeld bilden. Auch hier sind bordnetzentkoppelnde Filterelemente in den Heizstromzufühmngen notwendig (EP 0382895 Bl).Antenna arrangements are also known which form antennas for LMK and FM reception from the galvanically contacted heating field. Here, too, filter elements decoupling the vehicle electrical system are necessary in the heating current supply lines (EP 0382895 B1).
Vorteile der ErfindungAdvantages of the invention
Mit den Maßnahmen der Erfindung, d.h. mit einem Heizleiterfeld, welches mindestens für den UKW-Empfang, als auch für den LMK-Empfang vorgesehen ist, wobei mindestens ein Auskoppelelement für den UKW-Empfang vorgesehen ist, welches hochfrequenzmäßig niederohmig jedoch nicht galvanisch an das Heizleiterfeld angeschlossen ist, ist der Empfang von LMK- und diversitären UKW-Signalen mit einer durch ein einziges Sieb mittels gängigem Siebdruckverfahren aufgebrachten Leitungsstruktur in einer einzigen Fensterscheibe möglich, ohne dass auf eine vollständige Beheizung der gesamten Scheibe gerade im nicht durch Schwarzdruck (äußere Berandung der Scheibe) bedeckten Bereich verzichtet werden muss.With the measures of the invention, i.e. with a heating conductor field, which is provided at least for VHF reception, as well as for LMK reception, whereby at least one decoupling element is provided for VHF reception, which is connected to the heating conductor field in a low-frequency, low-impedance manner but is not galvanically connected LMK and diverse VHF signals with a line structure applied through a single sieve by means of the usual screen printing process in a single window pane are possible without having to do without complete heating of the entire pane, especially in the area not covered by black printing (outer edge of the pane).
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 Kraftfahrzeugs 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 single-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 im Fall des LMK-Empfangs keine Komponenten an das als Antenne wirkende Heizfeld angeschlossen sind, was im folgenden erläutert werden soll. Die zum Empfang von UKW- und TV-Signalen angeschlossenen elektronischen Komponenten können im Fall des LMK-Empfangs als eine Ersatzkapazität zwischen Antennenanschlusspunkt und Masse betrachtet werden. Diese liegt etwa im Bereich von 30-40pF. Die Empfangskapazität einer Heckscheibenantenne, gebildet aus dem gesamtenThe particular advantage of the invention is that in the case of LMK reception no components are connected to the heating field acting as an antenna, which will be explained in the following. In the case of LMK reception, the electronic components connected to receive FM and TV signals can be regarded as a replacement capacity between the antenna connection point and ground. This is around 30-40pF. The reception capacity of a rear window antenna, formed from the whole
Heizfeld, liegt im Bereich 150-250pF. Durch angeschlossene elektronische Komponenten wird diese Kapazität unnötig um mehr als 10% vergrößert, so dass der LMK-Empfang verschlechtert wird, weil Empfangssignale über die elektronische Baugruppe nach Masse abfließen. Diese Verschlechterung der Performance kann in Gebieten mit starker AM- Nutzung (z. B. USA, Mexiko) nicht toleriert werden. Durch ein hochfrequenzmäßig niederohmiges aber nicht galvanisch kontaktiertes Auskoppelelement ist die Ersatzkapazität der angeschlossenen elektronischen Baugruppe für LMK-Frequenzen nicht wirksam und damit der LMK-Empfang optimal.Heating field, is in the range 150-250pF. This capacity is unnecessarily increased by more than 10% by connected electronic components, so that the LMK reception is deteriorated because received signals flow to ground via the electronic assembly. This deterioration in performance cannot be tolerated in areas with high AM usage (e.g. USA, Mexico). Due to a high-frequency, low-impedance but not galvanically contacted decoupling element, the replacement capacity of the connected electronic module for LMK frequencies is not effective and therefore the LMK reception is optimal.
Ein weiterer Vorteil der Erfindung liegt in der kostengünstigen Fertigung. Gegenüber anderen Ausfuhrungsformen 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 im Fahrzeug und damit eine erhebliche Gewichtsreduktion.Another advantage of the invention lies in the cost-effective 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 in the vehicle and thus a considerable reduction in weight.
Da die Erfindung bezüglich der Ausgestaltung des Heizfeldes keinerlei Einschränkungen fordert, ist sie insbesondere für den Einsatz in Kraftfahrzeugen jeglicher Scheibentypen geeignet.Since the invention requires no restrictions with regard to the design of the heating field, it is particularly suitable for use in motor vehicles of all types of panes.
In den Unteransprüchen sind vorteilhafte Weiterbildungen angegeben.Advantageous further developments are specified in the subclaims.
Zeichnungendrawings
Anhand 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 Prinzipschaltbild einer Scheibenantenne nach der Erfindung,FIG. 1 shows a basic circuit diagram of a window antenna according to the invention,
Figur 2 eine Scheibenantenne mit zwei Auskopplungen für UKW-Empfang, Figur 3 eine Scheibenantenne mit einem Baugruppenträger für eine Mehrzahl von Auskoppelelementen,FIG. 2 shows a pane antenna with two decouplings for VHF reception, FIG. 3 shows a disk antenna with a subrack for a plurality of decoupling elements,
Figur 4 eine Scheibenantenne zur Speisung einer Diversity-Schalteinrichtung, Figur 5 eine Scheibenantenne mit Auskoppelelementen für andere Frequenzbereiche. Figur 6 eine Scheibenantenne mit alternativer Anordnung des Auskoppelelements.FIG. 4 shows a disk antenna for feeding a diversity switching device; FIG. 5 shows a disk antenna with coupling elements for other frequency ranges. Figure 6 is a disc antenna with an alternative arrangement of the coupling element.
Beschreibung von AusführungsbeispielenDescription of exemplary embodiments
Figur 1 zeigt eine Scheibenantenne bestehend aus parallel zueinander angeordneten Heizleitern 3, die jeweils an ihren linken und rechten Enden in eine Sammelschiene 4 münden. Das so gebildete Heizleiterfeld wird über ein Filterelement 5 mit Heizstrom versorgt (Ub-Heizung). Der Antennenanschlusspunkt 1 ist galvanisch mit dem Heizleiterfeld verbunden und realisiert den LMK-Empfang. Die Kontaktierung erfolgt an beliebiger Stelle vorteilhaft aber an der oberen äußeren Ecke des Heizleiterfeldes. Der Anteniienanschlusspunkt 2 ist mit einem Auskoppelelement 6 galvanisch verbunden. DasFIG. 1 shows a pane antenna consisting of heating conductors 3 arranged parallel to one another, each of which opens into a busbar 4 at its left and right ends. The heating conductor field thus formed is supplied with heating current via a filter element 5 (Ub heater). The antenna connection point 1 is galvanically connected to the heating conductor field and realizes the LMK reception. The contact is advantageously made at any point, but at the upper outer corner of the heating conductor field. The antenna connection point 2 is electrically connected to a decoupling element 6. The
Auskoppelelement 6 besteht vorzugsweise aus einem im wesentlichen parallel zumindest einer Berandung des Heizleiterfeldes angeordneten Leiter, die nicht durch die Sammelschienen 4 gegeben ist. Das Auskoppelelement kann auch beliebig geformt sein, vorteilhaft aber aus einem aus geradlinigen Leitungsstücken bestehenden Leitergebilde bestehen. Über das Auskoppelelement 6 ist der UKW-Empfang ermöglicht. DasDecoupling element 6 preferably consists of a conductor arranged essentially parallel to at least one edge of the heating conductor field, which is not provided by the busbars 4. The decoupling element can also be of any shape, but advantageously consist of a conductor structure consisting of straight line pieces. VHF reception is made possible via the decoupling element 6. The
Auskoppelelement/Leitergebilde 6 ist hochfrequenzmäßig niederohmig aber nicht galvanisch mit dem Heizleiterfeld verbunden. Es ist darauf zu achten, dass die kapazitive Kopplung zwischen Leitergebilde 6 und dem die Fensterscheibe umgebenden metallischen Rahmen 8 gering genug für ein gutes Empfangsverhalten ist. Die Ausbildung des Leitergebildes, die Länge der vorzugsweise geradlinigen Leiterstücke und/oder die geometrische Lage sind so ausgeführt, dass sich am Anteniienanschlusspunkt 2 im UKW-Frequenzbereich ein resonantes Impedanzverhalten ausbildet. Mit hochfrequenzmäßig niederohmig aber nicht galvanisch gekoppelt ist stets folgendes gemeint: Für TV- und UKW-Frequenzen ist die Kopplung zwischen dem Heizfeld und dem Auskoppelelement so groß wie möglich (S21 < 5 dB), für LMK-Coupling element / conductor structure 6 has a low-frequency, high-frequency connection, but is not galvanically connected to the heating conductor field. It is important to ensure that the capacitive coupling between the conductor structure 6 and the metallic frame 8 surrounding the window pane is low enough for good reception behavior. The formation of the conductor structure, the length of the preferably rectilinear conductor pieces and / or the geometrical position are designed such that a resonant impedance behavior forms at the antenna connection point 2 in the VHF frequency range. With high-frequency low-resistance but not galvanically coupled, the following is always meant: For TV and FM frequencies, the coupling between the heating field and the decoupling element is as large as possible (S21 <5 dB), for LMK-
Frequenzen ist die Kopplung so gering wie möglich (S21 > 15 dB). Unter diesen Umständen können außerdem die bei galvanisch ontaktiertem Heizfeld notwendigen UKW-/TV-Filterelemente geringer dimensioniert und damit kostengünstiger werden oder evtl. sogar ganz entfallen. Zur Verbesserung der Empfangseigenschaften können desweiteren eine Vielzahl im wesentlichen vertikale Anteimenleiter 9 vorgesehen werden, die mit dem Heizleitern 3 galvanisch an Äquipotentialpunkten der sich ausbildenden Spannungsverteilung verbunden sind. Die Länge der Antennenleiter 9 und/oder deren geometrische Lage ist festgelegt dadurch, dass sich ein resonanzartiges Verhalten der Antenne amFrequencies, the coupling is as low as possible (S21> 15 dB). Under these circumstances, the VHF / TV filter elements required in the case of a galvanically contacted heating field can also be dimensioned smaller and thus become more cost-effective or even be omitted entirely. In order to improve the reception properties, a plurality of essentially vertical animate conductors 9 can also be provided, which are galvanically connected to the heating conductors 3 at equipotential points of the voltage distribution that is being formed. The length of the antenna conductor 9 and / or its geometric position is determined by the fact that a resonance-like behavior of the antenna
Antennenanschlusspunkt 2 über den gesamten UKW-Empfangsbereich einstellt. Das Resonanzverhalten des Auskoppelelements 6 und der Anteimenleiter 9 kann durch einen gezielten Versatz der Resonanzfrequenzen so aufeinander abgestimmt sein, dass wie bei zwei gegeneinander verstimmten Bandfiltern insgesamt eine sehr viel breitere Resonanzüberhöhung zustande kommt, wie bei einem Einzelfilter. Damit kann der gesamte UKW-Bereich bezüglich der Resonanzüberhöhung abgedeckt werden.Set antenna connection point 2 over the entire FM reception range. The resonance behavior of the decoupling element 6 and the anteimate conductor 9 can be coordinated with one another by a targeted offset of the resonance frequencies in such a way that, as with two mutually detuned bandpass filters, a much broader resonance increase occurs overall, as in the case of a single filter. This means that the entire VHF range can be covered with regard to the excessive resonance.
Figur 2 zeigt eine wie in Figur 1 aufgebaute Scheibenantenne mit dem Unterschied, dass nun zwei Auskoppelelemente 6 jeweils am oberen Rand des Heizleiterfeldes links und rechts voneinander mitsamt ihren elektronischen Baugruppen 7 angeordnet sind. Es kann damit ein weiterer FM-Bereich überstrichen werden, ein zweiter UKW-Empfänger betrieben werden oder aber ein Diversity-Effekt durch unterschiedliche Empfangssignale an den beiden Auskoppelelementen 6 ausgenutzt werden, wie er z.B. unter ungünstigen Empfangsbedingungen im Mobileinsatz zustande kommen kann.FIG. 2 shows a disk antenna constructed as in FIG. 1, with the difference that two decoupling elements 6 are now arranged on the upper edge of the heating conductor field to the left and right of each other together with their electronic assemblies 7. A further FM range can thus be covered, a second VHF receiver can be operated, or a diversity effect can be exploited by means of different received signals on the two decoupling elements 6, as e.g. can occur under unfavorable reception conditions in mobile use.
Figur 3 zeigt eine erfindungsgemäße Scheibenantenne bei der die Antennenanschlusspunlcte 1 für LMK-Empfang und 2 für UKW-Empfang zu einer gemeinsamen mechanischen Komponente als Träger der elektronischen Baugruppen (gemeinsamer Baugruppenträger 10) geführt sind. Mit dieser Ausführung ist der mechanische Aufwand des Antennensystems minimiert.FIG. 3 shows a pane antenna according to the invention in which the antenna connection points 1 for LMK reception and 2 for FM reception are routed to a common mechanical component as the carrier for the electronic modules (common module rack 10). With this design, the mechanical complexity of the antenna system is minimized.
Bei der Ausgestaltung nach Figur 4 sind vier Auskoppelelemente 6 für UKW und eines für LMK vorgesehen. Diese Ausgestaltung ist geeignet z.B. eine Diversity- Schalteimichtung mit vier unterschiedlichen Antennensignalen zu speisen.In the embodiment according to FIG. 4, four decoupling elements 6 are provided for FM and one for LMK. This configuration is suitable e.g. to supply a diversity switching device with four different antenna signals.
Bei der Ausgestaltung nach Figur 5 sind mehrere Auskoppelelemente 61, 62 und 63 vorgesehen, die an ihrem Anschlusspunkt 2 galvanisch zusammengeschaltet sind. So kann z.B. das Auskoppelelement/Leiter 61 für den UKW-Empfang und die weiteren insbesondere kürzeren Auskoppelelemente 62, 63 können für den TV-Empfang im VHF oder UHF-Bereich vorgesehen sein. Die Auskoppelelemente 61, 62, 63 unterschiedlicher Länge verlaufen vorzugsweise parallel zueinander.In the embodiment according to FIG. 5, a plurality of decoupling elements 61, 62 and 63 are provided, which are galvanically interconnected at their connection point 2. For example, the decoupling element / conductor 61 for VHF reception and the further, in particular shorter, decoupling elements 62, 63 can be used for TV reception in VHF or UHF range can be provided. The decoupling elements 61, 62, 63 of different lengths preferably run parallel to one another.
Figur 6 zeigt eine weitere erfindungsgemäße Scheibenantenne. Hier führt der Antennenanschlusspunkt 1 zu einer elektronischen Baugruppe für LMK- und UKW-FIG. 6 shows a further pane antenna according to the invention. Here the antenna connection point 1 leads to an electronic assembly for LMK and FM
Signale. Eine zweite Antenne wird mittels des Auskoppelelementes 6 gebildet und über den Antennenschlusspunkt 2 einer weiteren elektronischen Baugruppe zugeführt. Auch in diesem Fall ist die kapazitive Belastung der Antenne im LMK-Empfangsfall optimiert, weil die zweite der elektronischen Baugruppen hochfrequenztechnisch hochohmig bei LMK-Frequenzen angeschlossen ist.Signals. A second antenna is formed by means of the coupling-out element 6 and fed to a further electronic assembly via the antenna connection point 2. In this case too, the capacitive loading of the antenna is optimized in the case of LMK reception, because the second of the electronic modules is connected at LMK frequencies with high-frequency technology.
Bei der Ausbildung unterschiedlicher UKW- Antennen ist darauf zu achten, dass die im mobilen und diversitären Empfangsverhalten gleichzeitig auftretenden Pegeleinbrüche minimiert sind.When designing different FM antennas, care must be taken to ensure that the level drops occurring simultaneously in mobile and diverse reception behavior are minimized.
Die beschriebene Erfindung gilt entsprechend auch für anders ausgeführte Heizleiterfelder, wenn z.B. die Heizleiter nicht waagerecht sondern senkrecht verlaufen.The described invention also applies accordingly to differently designed heating conductor fields, e.g. the heating conductors do not run horizontally but vertically.
Es ist weiterhin unerheblich, ob geteilte oder ungeteilte Heizleiterfelder vorliegen. It is also irrelevant whether there are divided or undivided heating conductor fields.

Claims

Patentansprüche claims
1. Fahrzeugscheibenantenne mit einem Heizleiterfeld, welches sowohl für den UKW- Empfang als auch für den LMK-Empfang vorgesehen ist, wobei mindestens ein Auskoppelelement (6) für den UKW-Empfang vorgesehen ist, welches hochfrequenzmäßig niederohmig jedoch nicht galvanisch an das Heizleiterfeld angeschlossen ist.1. Vehicle window antenna with a heating conductor field, which is provided both for VHF reception and for LMK reception, at least one decoupling element (6) being provided for VHF reception, which is connected to the heating conductor field in a low-frequency, but low-impedance manner ,
2. Scheibenantenne nach Anspruch 1, dadurch gekennzeichnet, dass das Auskoppelelement (6) für den UKW-Empfang aus mindestens einem Leiter besteht, der im wesentlichen parallel zu mindestens einer Berandung des Heizleiterfeldes angeordnet ist, die nicht durch eine Sammelschiene für das Heizleiterfeld gegeben ist.2. Disc antenna according to claim 1, characterized in that the decoupling element (6) for VHF reception consists of at least one conductor which is arranged essentially parallel to at least one edge of the heating conductor field, which is not provided by a busbar for the heating conductor field ,
3. Scheibenantenne nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Auskoppelelement/der Leiter (6) bezüglich seiner Länge und/oder Lage so ausgebildet ist, dass sich an seinem Anschlussende im UKW-Frequenzbereich ein resonantes Impedanzverhalten einstellt.3. Disc antenna according to claim 1 or 2, characterized in that the decoupling element / the conductor (6) is designed with respect to its length and / or position so that a resonant impedance behavior occurs at its connection end in the VHF frequency range.
4. Scheibenantenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass im Heizleiterfeld im wesentlichen senkrecht zu den Heizleitern (3) Antennenleiter (9) 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 (9) are arranged, which are electrically connected to the heating conductors (3).
5. Scheibenantenne nach Anspruch 4, dadurch gekennzeiclinet, dass die Antennenleiter (9) bezüglich ihrer Länge und/oder Lage derart ausgebildet sind, dass sich ein resonanzartiges Verhalten der Antenne am Anschlussende des Auskoppelelements/Leiters (6) im UKW-Bereich einstellt. 5. Disc antenna according to claim 4, characterized in that the antenna conductors (9) are designed with respect to their length and / or position in such a way that a resonant behavior of the antenna at the connection end of the decoupling element / conductor (6) occurs in the VHF range.
6. Scheibenantenne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass mindestens ein weiteres Auskoppelelement (62, 63) für einen anderen Frequenzbereich, z.B. für TV-Signale im VHF/UHF-Bereich vorgesehen ist.6. Disc antenna according to one of claims 1 to 5, characterized in that at least one further coupling element (62, 63) for a different frequency range, e.g. is intended for TV signals in the VHF / UHF range.
7. Scheibenantenne nach Anspruch 6, dadurch gekennzeichnet, dass das Auskoppelelement für den UKW-Empfang (61) sowie das mindestens eine weitere Auskoppelelement (62, 63) an ihrem Anschlussende galvanisch zusammengeschaltet sind.7. disc antenna according to claim 6, characterized in that the decoupling element for VHF reception (61) and the at least one further decoupling element (62, 63) are galvanically interconnected at their connection end.
8. Scheibenantenne nach einem der Ansprüche 1 bis 1, dadurch gekennzeichnet, dass mehrere Auskoppelelemente für den UKW-Empfang/ weitere Auskoppelelemente (61, 62, 63) für andere Frequenzbereiche zu einer Diversity-Schalteinrichtung geführt sind.8. Disc antenna according to one of claims 1 to 1, characterized in that a plurality of coupling elements for VHF reception / further coupling elements (61, 62, 63) for other frequency ranges are guided to a diversity switching device.
9. Scheibenantenne nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass eine Mehrzahl von Auskoppelelementen (6) einschließlich der Auskopplung für LMK-Empfang zu einem gemeinsamen Baugruppenträger (10) geführt sind.9. Disc antenna according to one of claims 1 to 8, characterized in that a plurality of decoupling elements (6) including the decoupling for LMK reception are guided to a common subrack (10).
10. Scheibenantenne nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass im Heizstromkreis ein Filterelement (5) vorgesehen ist. 10. Disc antenna according to one of claims 1 to 9, characterized in that a filter element (5) is provided in the heating circuit.
EP04791197A 2003-12-05 2004-10-12 Vehicle screen antenna Ceased EP1810364A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10356830A DE10356830A1 (en) 2003-12-05 2003-12-05 Vehicle window antenna
PCT/EP2004/052504 WO2005055360A1 (en) 2003-12-05 2004-10-12 Vehicle screen antenna

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EP1810364A1 true EP1810364A1 (en) 2007-07-25

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US (1) US20070279301A1 (en)
EP (1) EP1810364A1 (en)
JP (1) JP2006524927A (en)
BR (1) BRPI0415293A (en)
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WO (1) WO2005055360A1 (en)

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JP2006524927A (en) 2006-11-02
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WO2005055360A1 (en) 2005-06-16
DE10356830A1 (en) 2005-07-07

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