EP0978151B1 - Device for frequency selective suppression of high frequency signals - Google Patents

Device for frequency selective suppression of high frequency signals Download PDF

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Publication number
EP0978151B1
EP0978151B1 EP98941227A EP98941227A EP0978151B1 EP 0978151 B1 EP0978151 B1 EP 0978151B1 EP 98941227 A EP98941227 A EP 98941227A EP 98941227 A EP98941227 A EP 98941227A EP 0978151 B1 EP0978151 B1 EP 0978151B1
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EP
European Patent Office
Prior art keywords
hood
arrangement according
substrate surfaces
electrically conductive
arrangement
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EP98941227A
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German (de)
French (fr)
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EP0978151A1 (en
Inventor
Guenter Bertsch
Klaus-Dieter Miosga
Siegbert Martin
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters
    • H01P1/208Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00Coupling devices of the waveguide type
    • H01P5/08Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
    • H01P5/107Hollow-waveguide/strip-line transitions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00Resonators of the waveguide type
    • H01P7/06Cavity resonators

Definitions

  • the present invention relates to an arrangement for Frequency-selective suppression of high-frequency signals according to the preamble of the main claim. It concerns in particular an arrangement for the suppression of unwanted signal frequencies within a transmission and / or Receiving device.
  • auxiliary signals In transmitting and / or receiving facilities are the Generation or preparation of high-frequency signals frequently Auxiliary signals needed with the help of an oscillator be generated.
  • An example of this is the frequency signal a local oscillator in one Receiving device according to the Superhet270.
  • Such auxiliary signals usually should not or only in one tightly limited frequency range from the circuit component, for whom they are needed can exit.
  • Shielding, shielding and filter media use to Avoiding escape of these auxiliary signals from the each circuit component, it is known, if necessary Shielding, shielding and filter media use. The better the suppression of unwanted Signal frequencies should be, the higher is usually the required effort.
  • the arrangement comprises a substrate plate, on the one side the microstrip circuit and on the the other side of the ground plane are provided. Furthermore is a cavity resonator available. According to this font is the microstrip circuit using a Slot, which is provided in the ground plane, as well as one planar radiator, between the ground plane and the cavity resonator is arranged, coupled to the cavity resonator.
  • a waveguide is out of the DE 42 41 635 A1. It goes the microstrip line in a unilateral suspended substrates line over and a above this line on the opposite side of the substrate space is expanded to a cross section, the corresponds to the cross section of the subsequent waveguide.
  • Object of the present invention is to provide a generic Specify an arrangement for use in the Connection with microstrip circuits suitable is that has a high quality and at the same time easy and is inexpensive to produce. This task is done by an arrangement with. the characterizing features of the main claim solved. Advantage embodiments of the invention result from the subordinate claims.
  • the Invention can be particularly advantageous in combination with a housing wall of a shielding housing can be realized, as shown by way of example in Figure 3.
  • a filter assembly for use in a microstrip circuit which has a high quality and accordingly good for suppressing unwanted signal frequencies suitable is. It proves to be an advantage that by the substrate surfaces arranged separately from each other both a Gleichstromentkopplung as well as avoidance of direct overcoupling of surface waves is achieved. This contributes significantly to the good suppression of unwanted Signal frequencies at.
  • the arrangement according to claim 5 and 6 are mechanical Tensions due to different Temperature expansions of the strip conductor substrate and the Hollow chamber can arise, reliably avoided. Furthermore the arrangement according to the invention is insensitive to tolerances during assembly and therefore requires no Adjustment. In addition, the arrangement according to the invention also insensitive to tolerances with regard to the substrate thickness the stripline circuit.
  • the invention is that the substrate or the Stripline circuit only needs to be processed on one side. In comparison, it is in the arrangement according to the WO 92/13371, for example, necessary, a slot in the To introduce the ground plane of the strip conductor substrate, so that Here both sides of the substrate must be processed. The same applies to the transition to the suspended substrate line according to DE 42 41 635 A1.
  • the mentioned Arrangement thus easy and inexpensive to implement and easy to produce even in large quantities.
  • One very particular advantage of the invention results when the said arrangement in an existing shielding housing is integrated. This advantageous embodiment The invention is described in more detail in FIG.
  • FIG. 1 shows a perspective view of a device according to the invention Arrangement in which a hood 6 for the better Drawn illustration is cut open.
  • the hood 6 covered two separate substrate surfaces 2 and 3, which are arranged on a common carrier plate 1.
  • On the substrate surfaces 2, 3 are not further here shown stripline circuits.
  • Preferably owns the carrier plate 1 has an electrically conductive surface, at the same time also the ground plane for the not shown Stripline circuits on the substrate surfaces 2, 3 is.
  • the Coupling connections work as radiator or antenna elements and may, as in the present example, be patch antenna elements or alternatively, for example as well Slot radiator or other radiator elements formed be.
  • the separate arrangement of the substrate surfaces prevents that high frequency signals within the dielectric the substrate surfaces or on their surfaces of one Coupling connection to be transferred to the other directly.
  • an electrically conductive plate 7 is provided between the two substrate surfaces 2, 3 preferably an electrically conductive plate 7 is provided. This fills the space between the substrate surfaces 2 and 3, of the Hood 6 is covered, approximately up to the height of the substrate surfaces over the support plate 1 from. It serves on the one hand as a bottom surface of one formed in connection with the hood 6 Hollow chamber 11 and is advantageously for this purpose electrically conductive connected to the hood 6.
  • the plate 7 in addition to the Transmission of surface waves and in the dielectric the substrate surfaces propagatable waves of one Coupling connection to the other even more strongly prevented.
  • the plate 7 forms a firm stop for the two Substrate surfaces 2.3, thus ensuring a simple Assembly in which the two substrate surfaces have a defined Have distance to each other.
  • the plate 7 may be missing, the Hood 6 then preferably with the electrically conductive Surface of the support plate 1 electrically conductively connected is.
  • the electrically conductive surface of the carrier plate 1 can also be in addition to the plate 7 with the hood 6 electrically be conductively connected.
  • the hollow chamber 11 acts in a known manner as a cavity resonator, in the high-frequency signals by means of the coupling connections 4, 5 are on or coupled out.
  • At 15 is one imaginary connecting line between the coupling terminals. 4 and 5 indicated.
  • With 13 is a side wall of the hood. 6 designated according to a preferred embodiment of Invention is inclined obliquely over the coupling terminal 5.
  • FIG. 2 shows the same arrangement as Figure 1, wherein the Hood 6 is now shown in a "glassy" representation.
  • the hood 6 is made of a conductive Material and is therefore not transparent in the rule.
  • 14 denotes a second side wall of the hood 6, in the same way as the side wall 13 here over the Coupling connection 4 is inclined.
  • the inclined side walls 13, 14 are the side walls of the hood 6, which are transverse to the imaginary connecting line 15 run.
  • With 8 and 9 are Passage openings in the hood 6 denotes, among which Feed lines to the coupling terminals 4, 5 out are.
  • an air gap is designated, which according to a preferred embodiment of the invention, at least in sections between the hood 6 and the substrate surfaces 2 and 3, respectively can be present.
  • the size or width of the air gap 12 results from the assembly of the fact that between the hood 6 and the substrate surfaces 2, 3 no mechanical connection or attachment is provided.
  • the frequency-selective suppression of the invention Arrangement is based on the known mode of action of the cavity resonator. Such is known to be a high pass, in which only frequencies above a cutoff frequency propagate existent. The cutoff frequency of the high pass is due to the geometric dimensions of the hollow chamber 11 determined.
  • the substrate surfaces 2, 3 is also prevented that High-frequency signals, one of the two coupling connections 4, 5 are supplied, largely unfiltered as a wave within the dielectric of the substrate surfaces or as Surface wave transmitted to each other coupling connection become. This blocking effect is by the preferred introduced electrically conductive plate 7 supports.
  • the coupling connections are in the arrangement described here operated as antenna elements.
  • the overcoupling of the transmitting high-frequency signals from one to the other Coupling connection 4, 5 is by the obliquely inclined side walls Supported 13, 14 according to the known laws of reflection.
  • the possible air gap 12 between the hood and the Substrate can be chosen so that the manufacturing costs be minimized. This concerns above all the accuracy the assembly.
  • the material of the hood 6 and the conductive Plate 7 and the conductive surface of the support plate. 1 has the highest possible conductivity to resistive losses to minimize the filter assembly largely.
  • FIG. 3 shows a particularly advantageous embodiment of the Invention in which the inventive arrangement according to the Figures 1 and 2 in a bottom surface of a housing wall 10th a housing is integrated.
  • the housing with the housing wall 10 is preferably a shield over a circuit component to be shielded in microstrip technology.
  • the stripline circuit, not shown on the substrate surface 3 includes, for example an oscillator circuit for generating an auxiliary frequency in a receiving device of a motor vehicle radar system.
  • this Oscillator frequency only the sixth harmonic needed. These is in the order of 77 GHz.
  • the fundamental wave as well the lower harmonics are said to be due to electromagnetic Compatibility as completely as possible suppressed or shielded. To decouple the needed sixth harmonic is now the arrangement of the invention used.
  • the oscillator circuit through the housing with the housing wall 10 shielded.
  • the others in FIG. 3 The numbers used correspond to those of FIGS and 2.
  • the Plate 7 an integral part of the carrier plate 1, i.e. she is integrally connected with this.
  • the hood 6 then in the way in the Figures 1 and 2 shown, formed and as such a corresponding arrangement of two on separate substrate surfaces befindaji radiator elements set.
  • the hood 6 also in a side surface or a ceiling surface of a housing or be introduced only a support wall.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Anordnung zur frequenzselektiven Unterdrückung von Hochfrequenzsignalen gemäß dem Oberbegriff des Hauptanspruchs. Sie betrifft insbesondere eine Anordnung zur Unterdrückung von unerwünschten Signalfrequenzen innerhalb einer Sende- und/oder Empfangseinrichtung.The present invention relates to an arrangement for Frequency-selective suppression of high-frequency signals according to the preamble of the main claim. It concerns in particular an arrangement for the suppression of unwanted signal frequencies within a transmission and / or Receiving device.

In Sende- und/oder Empfangseinrichtungen werden zur Erzeugung oder Aufbereitung von Hochfrequenzsignalen häufig Hilfssignale benötigt, die mit Hilfe eines Oszillators erzeugt werden. Ein Beispiel hierfür ist das Frequenzsignal eines Empfangsoszillators (local oscillator) in einer Empfangseinrichtung nach dem Superhetprinzip. Solche Hilfssignale sollen in der Regel jedoch nicht oder nur in einem eng begrenzten Frequenzbereich aus dem Schaltungsbestandteil, für den sie benötigt werden, hinaustreten können. Zur Vermeidung eines Austretens dieser Hilfssignale aus dem jeweiligen Schaltungsbestandteil ist es bekannt, gegebenenfalls Abschirmbleche, Abschirmgehäuse und auch Filtermittel einzusetzen. Je besser die Unterdrückung unerwünschter Signalfrequenzen sein soll, desto höher ist in der Regel der dazu erforderliche Aufwand.In transmitting and / or receiving facilities are the Generation or preparation of high-frequency signals frequently Auxiliary signals needed with the help of an oscillator be generated. An example of this is the frequency signal a local oscillator in one Receiving device according to the Superhetprinzip. Such auxiliary signals usually should not or only in one tightly limited frequency range from the circuit component, for whom they are needed can exit. to Avoiding escape of these auxiliary signals from the each circuit component, it is known, if necessary Shielding, shielding and filter media use. The better the suppression of unwanted Signal frequencies should be, the higher is usually the required effort.

Im zuge der technischen Entwicklung werden im Rahmen der Hochfrequenztechnik zunehmend mehr Schaltungen in Mikrostreifenleitertechnik verwendet. Prinzipiell ist es möglich, auch Filterschaltungen zur Unterdrückung unerwünschter Signalfrequenzen in dieser Technik herzustellen. Diese besitzen jedoch häufig nicht die notwendige Güte, Trennschärfe oder Selektion zur vollständigen Unterdrückung unerwünschter Signalfrequenzen. Hochfrequenzfilter, die eine höhere Güte besitzen, sind in Form von Hohlraumresonatoren bekannt. Ebenso ist es bekannt, Schaltungen in Mikrostreifenleitertechnik mit solchen Hohlraumresonatoren zu kombinieren. Damit ist es möglich, auch bei einer Baugruppe in Mikrostreifenleitertechnik eine Filterschaltung höchstmöglicher Güte zu erreichen. Ein Beispiel für eine solche Anordnung ist in der WO 92/13 371 beschrieben. Diese Schrift betrifft eine Anordnung und ein Verfahren zur Ankopplung einer Mikrostreifenleiterschaltung an einen Höhlraumresonator. Die Anordnung umfaßt eine Substratplatte, auf deren einer Seite die Mikrostreifenleiterschaltung und auf deren anderer Seite die Masseebene vorgesehen sind. Weiterhin ist ein Hohlraumresonator vorhanden. Entsprechend dieser Schrift wird die Mikrostreifenleiterschaltung mit Hilfe eines Schlitzes, der in der Masseebene vorgesehen ist, sowie eines planaren Strahler, der zwischen der Masseebene und dem Hohlraumresonator angeordnet ist, an den Hohlraumresonator angekoppelt.In the course of technical development will be part of the High frequency technology increasingly more circuits in microstrip technology used. In principle, it is possible also filter circuits for the suppression of unwanted Signal frequencies to produce in this technique. These However, they often do not have the necessary quality, selectivity or selection for complete suppression unwanted signal frequencies. High-frequency filter, the one have higher quality, are in the form of cavity resonators known. It is also known circuits in microstrip technology with such cavity resonators too combine. This makes it possible, even with an assembly in microstrip technology, a filter circuit is the highest possible Goodness to reach. An example of such Arrangement is described in WO 92/13371. This font relates to an arrangement and a method for coupling a microstrip circuit to a Höhlraumresonator. The arrangement comprises a substrate plate, on the one side the microstrip circuit and on the the other side of the ground plane are provided. Furthermore is a cavity resonator available. According to this font is the microstrip circuit using a Slot, which is provided in the ground plane, as well as one planar radiator, between the ground plane and the cavity resonator is arranged, coupled to the cavity resonator.

Ein anderer Übergang von einer Mikrostreifenleiterschaltung auf in diesem Fall einen Hohlleiter ist aus der DE 42 41 635 A1 bekannt. Dabei geht die Mikrostreifenleitung in eine unilaterale Suspended-Substrate-Leitung über und ein über dieser Leitung auf der gegenüberliegenden Substratseite befindlicher Raum ist zu einem Querschnitt aufgeweitet, der dem Querschnitt des anschließenden Hohlleiters entspricht.Another transition from a microstrip circuit in this case a waveguide is out of the DE 42 41 635 A1. It goes the microstrip line in a unilateral suspended substrates line over and a above this line on the opposite side of the substrate space is expanded to a cross section, the corresponds to the cross section of the subsequent waveguide.

Schwierigkeiten können bei diesen bekannten Ankopplungen vor allem aufgrund mechanischer Verspannungen zwischen dem Substrat der Mikrostreifenleiterschaltung und dem Hohlleiter oder Hohlraumresonator auftreten. Diese Verspannungen resultieren aus unterschiedlichen, temperaturabhängigen Ausdehnungskoeffizienten der verschiedenen Materialien. Desweiteren sind die bekannten Ankopplungen häufig schwierig herzustellen, da die Montage und Verbindung der Mikrostreifenleitung mit dem Hohlraumresonator üblicherweise sehr exakt geschehen muß. Als weiterer Nachteil ist zu nennen, daß bei der Filteranordnung gemäß der WO 92/13 371 die Ein- und die Auskopplung der zu filternden Hochfrequenzsignale über ein und denselben Koppelanschluß erfolgt. Dabei kann nicht vollständig ausgeschlossen werden, daß zumindest ein Anteil unerwünschter Hochfrequenzsignale auf direktem Weg vom Eingang der Filteranordnung zum Ausgang übertragen wird.Difficulties can occur with these known couplings all due to mechanical tension between the Substrate of the microstrip circuit and the waveguide or cavity resonator occur. These tensions result from different, temperature-dependent expansion coefficients of different materials. Furthermore the known couplings are often difficult to manufacture, since the assembly and connection of the microstrip line with the cavity resonator usually very accurate must happen. Another disadvantage is that at the filter arrangement according to WO 92/13 371 the inputs and Extraction of the high-frequency signals to be filtered via a and the same coupling connection takes place. It can not be complete be ruled out that at least one share unwanted radio frequency signals directly from the Input of the filter assembly is transmitted to the output.

Aufgabe, Lösung und Vorteile der ErfindungTask, solution and advantages of the invention

Aufgabe der vorliegenden Erfindung ist es, eine gattungsgemäße Anordnung anzugeben, die für eine Verwendung im Zusammenhang mit Mikrostreifenleiterschaltungen geeignet ist, die eine hohe Güte aufweist und gleichzeitig einfach und kostengünstig herstellbar ist. Diese Aufgabe wird durch eine Anordnung mit. den kennzeichnenden Merkmalen des Hauptanspruchs gelöst. vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den untergeordneten Ansprüchen. Die Erfindung kann besonders vorteilhaft in Kombination mit einer Gehäusewand eines Abschirmgehäuses realisiert werden, wie dies beispielhaft in Figur 3 dargestellt ist. Vorzugsweise dient die erfindungsgemäße Anordnung in einem solchen Fall zur frequenzselektiven Einkopplung von Signalfrequenzen in das Abschirmgehäuse und/oder zur frequenzselektiven Auskopplung von Signalfrequenzen aus dem Abschirmgehäuse.Object of the present invention is to provide a generic Specify an arrangement for use in the Connection with microstrip circuits suitable is that has a high quality and at the same time easy and is inexpensive to produce. This task is done by an arrangement with. the characterizing features of the main claim solved. advantageous embodiments of the invention result from the subordinate claims. The Invention can be particularly advantageous in combination with a housing wall of a shielding housing can be realized, as shown by way of example in Figure 3. Preferably serves the inventive arrangement in such Case for the frequency-selective coupling of signal frequencies in the shield and / or for frequency-selective coupling of signal frequencies from the shield case.

Vorteil der Erfindung ist, daß hiermit eine Filteranordnung zur Verwendung in einer Mikrostreifenleiterschaltung angegeben ist, die eine hohe Güte aufweist und dementsprechend gut zur Unterdrückung unerwünschter Signalfrequenzen geeignet ist. Dabei erweist es sich als Vorteil, daß durch die getrennt voneinander angeordneten Substratflächen sowohl eine Gleichstromentkopplung als auch eine Vermeidung von direkten Überkopplungen von Oberflächenwellen erreicht wird. Dies trägt wesentlich zur guten Unterdrückung unerwünschter Signalfrequenzen bei. Gemäß einer vorteilhaften Weiterbildung der Anordnung nach Anspruch 5 und 6 werden mechanische Verspannungen, die aufgrund von unterschiedlichen Temperaturausdehnungen des Streifenleitersubstrats und der Hohlkammer entstehen können, zuverlässig vermieden. Desweiteren ist die erfindungsgemäße Anordnung toleranzunempfindlich bei der Montage und erfordert dementsprechend keinen Abgleich. Darüber hinaus ist die erfindungsgemäße Anordnung auch toleranzunempfindlich hinsichtlich der Substratdicke der Streifenleiterschaltung. Ein weiterer, besonderer Vorteil der Erfindung besteht darin, daß das Substrat bzw. die Streifenleiterschaltung nur einseitig bearbeitet werden muß. Im Vergleich dazu ist es bei der Anordnung gemäß der WO 92/13 371 beispielsweise notwendig, einen Schlitz in die Masseebene des Streifenleitersubstrats einzubringen, so daß hier beide Seiten des Substrats bearbeitet werden müssen. Ähnliches gilt für den Übergang auf die Suspended-Substrate-Leitung gemäß der DE 42 41 635 A1. Insgesamt ist die genannte Anordnung somit einfach und kostengünstig realisierbar und auch in hohen Stückzahlen leicht herstellbar. Ein ganz besonderer Vorteil der Erfindung ergibt sich, wenn die genannte Anordnung in ein bereits vorhandenes Abschirmgehäuse integriert wird. Diese vorteilhafte Ausgestaltung der Erfindung ist in Figur 3 näher beschrieben.Advantage of the invention is that hereby a filter assembly for use in a microstrip circuit is specified, which has a high quality and accordingly good for suppressing unwanted signal frequencies suitable is. It proves to be an advantage that by the substrate surfaces arranged separately from each other both a Gleichstromentkopplung as well as avoidance of direct overcoupling of surface waves is achieved. This contributes significantly to the good suppression of unwanted Signal frequencies at. According to an advantageous development The arrangement according to claim 5 and 6 are mechanical Tensions due to different Temperature expansions of the strip conductor substrate and the Hollow chamber can arise, reliably avoided. Furthermore the arrangement according to the invention is insensitive to tolerances during assembly and therefore requires no Adjustment. In addition, the arrangement according to the invention also insensitive to tolerances with regard to the substrate thickness the stripline circuit. Another, special advantage the invention is that the substrate or the Stripline circuit only needs to be processed on one side. In comparison, it is in the arrangement according to the WO 92/13371, for example, necessary, a slot in the To introduce the ground plane of the strip conductor substrate, so that Here both sides of the substrate must be processed. The same applies to the transition to the suspended substrate line according to DE 42 41 635 A1. Overall, the mentioned Arrangement thus easy and inexpensive to implement and easy to produce even in large quantities. One very particular advantage of the invention results when the said arrangement in an existing shielding housing is integrated. This advantageous embodiment The invention is described in more detail in FIG.

Beschreibung von AusführungsbeispielenDescription of exemplary embodiments

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand einer Zeichnung erläutert. Es zeigen

  • Figur 1 eine perspektivische Darstellung der erfindungsgemäßen Anordnung, bei der eine Haube aufgeschnitten dargestellt ist,
  • Figur 2 eine perspektivische Darstellung der erfindungsgemäßen Anordnung, bei der die Haube "durchsichtig" dargestellt ist und
  • Figur 3 eine Schnittbild, bei dem die Haube Bestandteil einer Gehäusewand ist.
  • Hereinafter, embodiments of the invention will be explained with reference to a drawing. Show it
  • 1 shows a perspective view of the arrangement according to the invention, in which a hood is shown cut away,
  • Figure 2 is a perspective view of the arrangement according to the invention, in which the hood is shown "transparent" and
  • Figure 3 is a sectional view in which the hood is part of a housing wall.
  • Figur 1 zeigt eine perspektivische Darstellung einer erfindungsgemäßen Anordnung, bei der eine Haube 6 zur besseren Darstellung aufgeschnitten gezeichnet ist. Die Haube 6 überdeckt zwei voneinander getrennte Substratflächen 2 und 3, die auf einer gemeinsamen Trägerplatte 1 angeordnet sind. Auf den Substratflächen 2, 3 befinden sich hier nicht weiter dargestellte Streifenleiterschaltungen. Vorzugsweise besitzt die Trägerplatte 1 eine elektrisch leitfähige Oberfläche, die gleichzeitig auch die Masseebene für die nicht dargestellten Streifenleiterschaltungen auf den Substratflächen 2, 3 ist. Auf jeder der beiden Substratflächen 2, 3 ist ein Koppelanschluß 4, 5 in Streifenleitertechnik vorhanden. Die Koppelanschlüsse arbeiten als Strahler- oder Antennenelemente und können wie im vorliegenden Beispiel als Patchantennenelemente oder alternativ beispielsweise auch als Schlitzstrahler oder sonstige Strahlerelemente ausgebildet sein.FIG. 1 shows a perspective view of a device according to the invention Arrangement in which a hood 6 for the better Drawn illustration is cut open. The hood 6 covered two separate substrate surfaces 2 and 3, which are arranged on a common carrier plate 1. On the substrate surfaces 2, 3 are not further here shown stripline circuits. Preferably owns the carrier plate 1 has an electrically conductive surface, at the same time also the ground plane for the not shown Stripline circuits on the substrate surfaces 2, 3 is. On each of the two substrate surfaces 2, 3 is a Coupling connection 4, 5 in stripline technology available. The Coupling connections work as radiator or antenna elements and may, as in the present example, be patch antenna elements or alternatively, for example as well Slot radiator or other radiator elements formed be.

    Durch die getrennte Anordnung der Substratflächen wird verhindert, daß Hochfrequenzsignale innerhalb des Dielektrikums der Substratflächen oder auf deren Oberflächen von einem Koppelanschluß zum anderen direkt übertragen werden. Zwischen den beiden Substratflächen 2, 3 ist vorzugsweise eine elektrisch leitfähige Platte 7 vorgesehen. Diese füllt den Raum zwischen den Substratflächen 2 und 3, der von der Haube 6 überdeckt ist, in etwa bis zur Höhe der Substratflächen über der Trägerplatte 1 aus. Sie dient einerseits als Bodenfläche einer in Verbindung mit der Haube 6 gebildeten Hohlkammer 11 und ist zu diesem Zweck vorteilhafterweise elektrisch leitfähig mit der Haube 6 verbunden. Darüber hinaus wird durch die Platte 7 zusätzlich auch die Übertragung von Oberflächenwellen und von im Dielektrikum der Substratflächen ausbreitungsfähigen Wellen von einem Koppelanschluß zum anderen noch stärker unterbunden. Außerdem bildet die Platte 7 einen festen Anschlag für die beiden Substratflächen 2,3 und gewährleistet so eine einfache Montage, bei der die beiden Substratflächen einen definierten Abstand zueinander haben. In einer einfacheren Ausführungsform kann die Platte 7 jedoch auch fehlen, wobei die Haube 6 dann vorzugsweise mit der elektrisch leitfähigen Oberfläche der Trägerplatte 1 elektrisch leitfähig verbunden ist. Die elektrisch leitfähige Oberfläche der Trägerplatte 1 kann auch zusätzlich zu der Platte 7 mit der Haube 6 elektrisch leitfähig verbunden sein. The separate arrangement of the substrate surfaces prevents that high frequency signals within the dielectric the substrate surfaces or on their surfaces of one Coupling connection to be transferred to the other directly. Between the two substrate surfaces 2, 3 is preferably an electrically conductive plate 7 is provided. This fills the space between the substrate surfaces 2 and 3, of the Hood 6 is covered, approximately up to the height of the substrate surfaces over the support plate 1 from. It serves on the one hand as a bottom surface of one formed in connection with the hood 6 Hollow chamber 11 and is advantageously for this purpose electrically conductive connected to the hood 6. In addition, by the plate 7 in addition to the Transmission of surface waves and in the dielectric the substrate surfaces propagatable waves of one Coupling connection to the other even more strongly prevented. Furthermore the plate 7 forms a firm stop for the two Substrate surfaces 2.3, thus ensuring a simple Assembly in which the two substrate surfaces have a defined Have distance to each other. In a simpler embodiment However, the plate 7 may be missing, the Hood 6 then preferably with the electrically conductive Surface of the support plate 1 electrically conductively connected is. The electrically conductive surface of the carrier plate 1 can also be in addition to the plate 7 with the hood 6 electrically be conductively connected.

    Die Hohlkammer 11 wirkt in bekannter Weise als Hohlraumresonator, in den Hochfrequenzsignale mittels der Koppelanschlüsse 4, 5 ein- bzw. auskoppelbar sind. Mit 15 ist eine gedachte Verbindungslinie zwischen den Koppelanschlüssen 4 und 5 angedeutet. Mit 13 ist eine Seitenwand der Haube 6 bezeichnet, die gemäß einer bevorzugten Ausführung der Erfindung schräg über den Koppelanschluß 5 geneigt ist.The hollow chamber 11 acts in a known manner as a cavity resonator, in the high-frequency signals by means of the coupling connections 4, 5 are on or coupled out. At 15 is one imaginary connecting line between the coupling terminals. 4 and 5 indicated. With 13 is a side wall of the hood. 6 designated according to a preferred embodiment of Invention is inclined obliquely over the coupling terminal 5.

    Figur 2 zeigt dieselbe Anordnung wie Figur 1, wobei die Haube 6 nun in einer "gläsernen" Darstellung gezeigt ist. Tatsächlich besteht die Haube 6 jedoch aus einem leitfähigen Material und ist insofern in der Regel nicht durchsichtig. Neben den bereits in Figur 1 bezeichneten Elementen sind in dieser Darstellung zusätzlich folgende Merkmale zu erkennen. Mit 14 ist eine zweite Seitenwand der Haube 6 bezeichnet, die in gleicher weise wie die Seitenwand 13 hier über den Koppelanschluß 4 geneigt ist. Die geneigten Seitenwände 13, 14 sind dabei die Seitenwände der Haube 6, die quer zu der gedachten Verbindungslinie 15 verlaufen. Mit 8 und 9 sind Durchlaßöffnungen in der Haube 6 bezeichnet, unter denen Zuführungsleitungen zu den Koppelanschlüssen 4, 5 geführt sind. Mit 12 ist ein Luftspalt bezeichnet, der gemäß einer bevorzugten Ausführung der Erfindung zumindest abschnittsweise zwischen der Haube 6 und den Substratflächen 2 bzw. 3 vorhanden sein kann. Die Größe oder Breite des Luftspalts 12 ergibt sich bei der Montage der Anordnung daraus, daß zwischen der Haube 6 und den Substratflächen 2, 3 keine mechanische Verbindung oder Befestigung vorgesehen ist. Mit anderen Worten ist die Haube 6 ohne eine direkte Befestigung an den Substratflächen 2, 3 über diesen angeordnet. Aufgrund dieses Merkmals werden mechanische Verspannungen, wie sie bereits eingangs erläutert wurden, vermieden. Figure 2 shows the same arrangement as Figure 1, wherein the Hood 6 is now shown in a "glassy" representation. In fact, however, the hood 6 is made of a conductive Material and is therefore not transparent in the rule. In addition to the already designated in Figure 1 elements are in This illustration additionally recognizes the following features. 14 denotes a second side wall of the hood 6, in the same way as the side wall 13 here over the Coupling connection 4 is inclined. The inclined side walls 13, 14 are the side walls of the hood 6, which are transverse to the imaginary connecting line 15 run. With 8 and 9 are Passage openings in the hood 6 denotes, among which Feed lines to the coupling terminals 4, 5 out are. With 12 an air gap is designated, which according to a preferred embodiment of the invention, at least in sections between the hood 6 and the substrate surfaces 2 and 3, respectively can be present. The size or width of the air gap 12 results from the assembly of the fact that between the hood 6 and the substrate surfaces 2, 3 no mechanical connection or attachment is provided. With In other words, the hood 6 without a direct attachment arranged on the substrate surfaces 2, 3 above this. by virtue of This feature will be mechanical tension, as they are already explained at the beginning, avoided.

    Die frequenzselektive Unterdrückung der erfindungsgemäßen Anordnung beruht auf der bekannten Wirkungsweise des Hohlraumresonators. Ein solcher wirkt bekanntermaßen als Hochpaß, in dem nur Frequenzen oberhalb einer Grenzfrequenz ausbreitungsfähig existent sind. Die Grenzfrequenz des Hochpasses ist durch die geometrischen Abmessungen der Hohlkammer 11 bestimmt. Durch die voneinander getrennte Anordnung der Substratflächen 2, 3 wird zudem verhindert, daß Hochfrequenzsignale, die einem der beiden Koppelanschlüsse 4, 5 zugeführt werden, weitgehend ungefiltert als Welle innerhalb des Dielektrikums der Substratflächen oder als Oberflächenwelle zum jeweils anderen Koppelanschluß übertragen werden. Diese Sperrwirkung wird durch die vorzugsweise eingebrachte elektrisch leitfähige Platte 7 unterstützt.The frequency-selective suppression of the invention Arrangement is based on the known mode of action of the cavity resonator. Such is known to be a high pass, in which only frequencies above a cutoff frequency propagate existent. The cutoff frequency of the high pass is due to the geometric dimensions of the hollow chamber 11 determined. By the separate arrangement the substrate surfaces 2, 3 is also prevented that High-frequency signals, one of the two coupling connections 4, 5 are supplied, largely unfiltered as a wave within the dielectric of the substrate surfaces or as Surface wave transmitted to each other coupling connection become. This blocking effect is by the preferred introduced electrically conductive plate 7 supports.

    Die Koppelanschlüsse werden in der hier beschriebenen Anordnung als Antennenelemente betrieben. Die Überkopplung der zu übertragenden Hochfrequenzsignale von einem auf den anderen Koppelanschluß 4, 5 wird durch die schräg geneigten Seitenwände 13, 14 gemäß den bekannten Reflexionsgesetzen unterstützt. Der mögliche Luftspalt 12 zwischen der Haube und dem Substrat kann so gewählt werden, daß die Fertigungskosten minimiert werden. Dies betrifft vor allem die Genauigkeit der Montage. Das Material der Haube 6 sowie der leitenden Platte 7 bzw. der leitenden Oberfläche der Trägerplatte 1 besitzt eine möglichst hohe Leitfähigkeit, um ohmsche Verluste der Filteranordnung weitgehend zu minimieren.The coupling connections are in the arrangement described here operated as antenna elements. The overcoupling of the transmitting high-frequency signals from one to the other Coupling connection 4, 5 is by the obliquely inclined side walls Supported 13, 14 according to the known laws of reflection. The possible air gap 12 between the hood and the Substrate can be chosen so that the manufacturing costs be minimized. This concerns above all the accuracy the assembly. The material of the hood 6 and the conductive Plate 7 and the conductive surface of the support plate. 1 has the highest possible conductivity to resistive losses to minimize the filter assembly largely.

    Figur 3 zeigt eine besonders vorteilhafte Ausgestaltung der Erfindung, bei der die erfindungsgemäße Anordnung gemäß den Figuren 1 und 2 in eine Bodenfläche einer Gehäusewand 10 eines Gehäuses integriert ist. Das Gehäuse mit der Gehäusewand 10 ist dabei vorzugsweise ein Abschirmgehäuse über einem abzuschirmenden Schaltungsbestandteil in Mikrostreifenleitertechnik. Die nicht gezeigte Streifenleiterschaltung auf der Substratfläche 3 beinhaltet beispielsweise eine Oszillatorschaltung zur Erzeugung einer Hilfsfrequenz in einer Empfangseinrichtung eines Kraftfahrzeug-Radarsystems. In einem konkreten Anwendungsfall wird von dieser Oszillatorfrequenz nur die sechste Oberwelle benötigt. Diese liegt in den Größenordnung von 77 GHz. Die Grundwelle sowie die niedrigeren Oberwellen sollen aus Gründen der elektromagnetischen Verträglichkeit möglichst vollständig unterdrückt bzw. abgeschirmt werden. Zur Auskopplung der benötigten sechsten Oberwelle wird nun die erfindungsgemäße Anordnung verwendet. Zusätzlich zu der Filterwirkung der Hohlkammer 11 ist die Oszillatorschaltung durch das Gehäuse mit der Gehäusewand 10 abgeschirmt. Die weiteren in Figur 3 verwendeten Bezifferungen entsprechen denen der Figuren 1 und 2. Vorteilhafterweise ist bei dieser Anordnung die Platte 7 ein integrierter Bestandteil der Trägerplatte 1, d.h. sie ist einstückig mit dieser verbunden.Figure 3 shows a particularly advantageous embodiment of the Invention in which the inventive arrangement according to the Figures 1 and 2 in a bottom surface of a housing wall 10th a housing is integrated. The housing with the housing wall 10 is preferably a shield over a circuit component to be shielded in microstrip technology. The stripline circuit, not shown on the substrate surface 3 includes, for example an oscillator circuit for generating an auxiliary frequency in a receiving device of a motor vehicle radar system. In a concrete application case of this Oscillator frequency only the sixth harmonic needed. These is in the order of 77 GHz. The fundamental wave as well the lower harmonics are said to be due to electromagnetic Compatibility as completely as possible suppressed or shielded. To decouple the needed sixth harmonic is now the arrangement of the invention used. In addition to the filtering effect of the hollow chamber 11 is the oscillator circuit through the housing with the housing wall 10 shielded. The others in FIG. 3 The numbers used correspond to those of FIGS and 2. Advantageously, in this arrangement, the Plate 7 an integral part of the carrier plate 1, i.e. she is integrally connected with this.

    Über dieses bevorzugte Ausführungsbeispiel hinaus ist die beschriebene Anordnung jedoch auch in allen anderen Fällen anwendbar, in denen eine frequenzselektive Anordnung in Verbindung mit Streifenleitungsschaltungen benötigt wird. Gegebenenfalls ist die Haube 6 dann in der Art, wie in den Figuren 1 und 2 gezeigt, ausgebildet und als solche über eine entsprechende Anordnung zweier auf getrennten Substratflächen befindlicher Strahlerelemente gesetzt. Je nach den konkret vorliegenden Gegebenheiten kann die Haube 6 auch in eine Seitenfläche oder eine Deckenfläche einer Gehäuse- oder auch nur einer Stützwand eingebracht sein.Beyond this preferred embodiment, the However, the arrangement described in all other cases applicable, in which a frequency-selective arrangement in conjunction with stripline circuits is needed. Optionally, the hood 6 then in the way in the Figures 1 and 2 shown, formed and as such a corresponding arrangement of two on separate substrate surfaces befindlicher radiator elements set. Depending on the concretely present conditions, the hood 6 also in a side surface or a ceiling surface of a housing or be introduced only a support wall.

    Claims (11)

    1. Arrangement for the frequency-selective suppression of radio-frequency signals, particularly for the suppression of undesirable signal frequencies within a transmitting or receiving device, with the arrangement comprising:
      a hollow chamber (11) which is at least partially bounded by electrically conductive walls (6, 7), and
      coupling connections (4, 5) for injecting the radio-frequency signals into, and outputting them from, the hollow chamber (11),
      with the coupling connections (4, 5) being antenna elements which have been implemented using stripline technology,
         characterized
      in that there are at least two antenna elements, at least one of which is intended to inject the radio-frequency signals and at least one other of which is intended to output the radio-frequency signals,
      in that the at least two antenna elements (4, 5) are formed on substrate surfaces (2, 3) which are separate from one another,
      in that the substrate surfaces (2, 3) which are separate from one another are arranged on a common mounting board (1), and
      in that the hollow chamber is formed from a hood (6) which is arranged on or above the mounting board (1) in such a manner that it covers the radiating elements (4, 5).
    2. Arrangement according to Claim 1, characterized in that the mounting board (1) has an electrically conductive surface, and in that the hood (6) is electrically conductively connected to the electrically conductive surface of the mounting board.
    3. Arrangement according to Claim 1 or 2, characterized in that there is an electrically conductive plate (7) between the substrate surfaces (2, 3) which are separate from one another, and in that the electrically conductive plate (7) is electrically conductively connected to the hood (6).
    4. Arrangement according to Claim 3, characterized in that the electrically conductive plate (7) largely fills the space (which is covered by the hood (6)) between the substrate surfaces (2, 3), up to the level of the substrate surfaces above the mounting board (1).
    5. Arrangement according to one of the preceding claims, characterized in that the hood (6) is arranged above the substrate surfaces (2, 3) without being directly fastened to the latter.
    6. Arrangement according to Claim 5, characterized in that there is an air gap (12) between the hood (6) and the substrate surfaces (2, 3), at least in places.
    7. Arrangement according to one of the preceding claims, characterized in that the hood (6) has aperture openings (8, 9) beneath which supply lines are routed through to the radiating elements (4, 5).
    8. Arrangement according to one of the preceding claims, characterized in that side surfaces (13, 14) of the hood (6), which run transversely to an imaginary connecting line (15) between the at least two antenna elements (4, 5), are obliquely inclined over the antenna elements.
    9. Arrangement according to one of the preceding claims, characterized in that the hood (6) is integrated in a wall (10) of a housing (Figure 3).
    10. Arrangement according to Claim 9, characterized in that the hood (6) is integrated in a bottom surface of a housing wall (10) of a screened housing.
    11. Use of an arrangement according to one of the preceding claims, in particular according to Claim 10, in a motor vehicle radar system for suppressing and/or screening undesirable radio-frequency signals.
    EP98941227A 1997-12-24 1998-06-23 Device for frequency selective suppression of high frequency signals Expired - Lifetime EP0978151B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19757892 1997-12-24
    DE19757892A DE19757892A1 (en) 1997-12-24 1997-12-24 Arrangement for frequency-selective suppression of high-frequency signals
    PCT/DE1998/001715 WO1999034474A1 (en) 1997-12-24 1998-06-23 Device for frequency selective suppression of high frequency signals

    Publications (2)

    Publication Number Publication Date
    EP0978151A1 EP0978151A1 (en) 2000-02-09
    EP0978151B1 true EP0978151B1 (en) 2005-03-23

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    US (1) US6255745B1 (en)
    EP (1) EP0978151B1 (en)
    JP (1) JP3892051B2 (en)
    DE (2) DE19757892A1 (en)
    WO (1) WO1999034474A1 (en)

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    * Cited by examiner, † Cited by third party
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    DE10243670B3 (en) * 2002-09-20 2004-02-12 Eads Deutschland Gmbh Waveguide filter with upper, structured metallic layer and striplines on substrate, also includes surface-mounted-device on top of substrate
    US8179304B2 (en) 2007-06-14 2012-05-15 Kyocera Corporation Direct-current blocking circuit, hybrid circuit device, transmitter, receiver, transmitter-receiver, and radar device
    DE102019122952B4 (en) * 2019-08-27 2022-07-14 Tdk Electronics Ag HF dense switching interface, arrangement and shielded room

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    US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
    DE3426565A1 (en) * 1984-07-19 1986-01-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Contact-free connection for planar leads
    US4796079A (en) * 1984-07-25 1989-01-03 Rca Licensing Corporation Chip component providing rf suppression
    JPS62183201A (en) * 1986-02-07 1987-08-11 Hitachi Ltd High frequency distributing and synthesizing equipment
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    JP3101460B2 (en) * 1992-04-03 2000-10-23 三洋電機株式会社 Dielectric filter and duplexer using the same
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    US5900796A (en) * 1997-02-26 1999-05-04 Fair-Rite Products Corporation Electric noise suppressor

    Also Published As

    Publication number Publication date
    DE19757892A1 (en) 1999-07-01
    DE59812680D1 (en) 2005-04-28
    JP3892051B2 (en) 2007-03-14
    WO1999034474A1 (en) 1999-07-08
    JP2001513307A (en) 2001-08-28
    US6255745B1 (en) 2001-07-03
    EP0978151A1 (en) 2000-02-09

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