WO2000064001A1 - High-frequency filter - Google Patents

High-frequency filter Download PDF

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Publication number
WO2000064001A1
WO2000064001A1 PCT/EP2000/003302 EP0003302W WO0064001A1 WO 2000064001 A1 WO2000064001 A1 WO 2000064001A1 EP 0003302 W EP0003302 W EP 0003302W WO 0064001 A1 WO0064001 A1 WO 0064001A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency filter
immersion
tuning element
filter according
dielectric
Prior art date
Application number
PCT/EP2000/003302
Other languages
German (de)
French (fr)
Inventor
Wilhelm Weitzenberger
Heinz Schwarz
Original Assignee
Kathrein-Werke Kg
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
Priority to DK00925207T priority Critical patent/DK1169747T3/en
Priority to KR1020017012113A priority patent/KR20010112362A/en
Priority to DE50000248T priority patent/DE50000248D1/en
Priority to AT00925207T priority patent/ATE219862T1/en
Priority to JP2000613031A priority patent/JP2002542695A/en
Priority to AU44004/00A priority patent/AU769264B2/en
Application filed by Kathrein-Werke Kg filed Critical Kathrein-Werke Kg
Priority to CA002370133A priority patent/CA2370133A1/en
Priority to BR0009723-3A priority patent/BR0009723A/en
Priority to NZ514485A priority patent/NZ514485A/en
Priority to EP00925207A priority patent/EP1169747B1/en
Publication of WO2000064001A1 publication Critical patent/WO2000064001A1/en
Priority to HK02106039A priority patent/HK1044633A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the invention relates to a high-frequency filter in a coaxial design according to the preamble of claim 1.
  • a generic high-frequency filter can consist of one or more individual resonators in coaxial technology.
  • Such coaxially constructed high-frequency filters are generally used in radio engineering systems, for example in the mobile radio field. You can e.g. are used in base stations for mobile radio, specifically for the selection of defined transmission and reception bands.
  • a known coaxial resonator be ⁇ which comprises a cylindrical sealed housing with a bottom and an inner conductor tube, which is seated coaxially to the outer conductor.
  • the cylindrically shaped inner conductor tube takes a cylindrical inner conductor section that slides in the inner conductor tube. By displacing the end section of this inner conductor section relative to the inner conductor tube, resonance tuning is carried out with respect to the respective frequency.
  • the inner conductor is designed in the form of a sleeve which is closed at the end and which is held and anchored at the upper open end of the outer conductor tube in the region of a cover to be attached.
  • a further high-frequency filter which uses a screw element to tune the frequency band in question, which is arranged on the cover of the individual resonator with a cylindrical structure, and penetrates to different depths into the inner conductor of the coaxial individual resonator by screwing in and out .
  • This also results in a change in capacitance of the resonator, as in DE 21 36 728, and a change in frequency as a result of the change in capacitance.
  • a high-frequency resonator is also known in principle from EP 0 068 919 A1, which has a setting device which runs transversely to the longitudinal axis of the resonator and can be radially screwed in and out differently from the outside through the wall of the resonator.
  • this adjusting device has a pin made of dielectric material running transversely to the axial direction of the resonator, so that by adjusting the adjusting device and radial displacement of the pin made of dielectric material, a capacitance and Frequency change is feasible.
  • a disadvantage of the tuning configuration explained is that components for tuning the resonance frequency impair the homogeneity of the electrically conductive surface in the interior of the filter (for example sliding contacts, solder joints, transition areas of different materials, etc.) and that there is a disadvantageous change in the frequency response due to undefined contacts at the relevant contact points is (intermodulation).
  • the tuning device requires a not insignificant space requirement.
  • Another disadvantage is that a change in temperature affects the frequency response.
  • the object of the present invention is to provide an improved high-frequency filter in a coaxial design.
  • the present invention provides simple means a significant improvement over conventional high-frequency filters or coaxial filters.
  • a problem-free frequency tuning can be carried out without indefinite contacts resulting in undesired passive intermodulation.
  • the tuning element consisting of a dielectric material and immersed in the coaxial inner conductor is not anchored to the cover of the high-frequency filter device as in the prior art.
  • the anchoring is preferably carried out in such a way that the resulting capacitance between the open end of the inner conductor and the housing cover decreases when the temperature rises and thus results in frequency-related temperature compensation of the filter.
  • the electrical tuning elements in the inner conductor preferably in the region of the bottom of the coaxial filter element, are supported so as to be adjustable at different heights in order to enable the temperature compensation explained above.
  • a dielectric material which has a thermal expansion coefficient that is as low as possible.
  • FIG. 1 shows a schematic axial cross section through a high-frequency filter according to the invention in the form of a single resonator
  • FIG. 2 a schematic horizontal cross section along the line II-III in FIG. 1.
  • an individual resonator in coaxial technology is shown in axial longitudinal section or in cross section thereto, which is also referred to below as a coaxial resonator or coaxial filter.
  • This consists of an outer conductor 1, an inner conductor 3 arranged concentrically or coaxially thereto in the exemplary embodiment shown, and a base 5, via which the electrically conductive outer conductor 1 and the electrically conductive inner conductor 3 are electrically connected to one another.
  • an adjusting element 7 is provided, which in the embodiment shown consists of a threaded plate or pot 7 '.
  • This thread The plate or threaded pot 7 'has an external thread 9 in its outer circumference, which is in engagement with a corresponding internal thread 11, which has at least a sufficient axial length on the inside of the inner conductor 3 and / or on the inside of one axially in the bottom 5 provided recess 13 is provided.
  • the threaded plate or pot 7 ' has a twisting or driving attachment 15, in the exemplary embodiment shown in the form of a slot, for example in order to twist the adjusting element 7 and thus axially shift the same with respect to the inner conductor by means of a screwdriver.
  • a pin-shaped immersion or tuning element 17 is fixedly arranged on this adjusting element 7, which is designed in the form of a pin or a cylinder in the exemplary embodiment shown.
  • the length, the diameter, the dielectric constant and the attachment point of the dielectric tuning element or cylinder 17 are selected so that the desired resonance frequency can be set in the desired frequency range.
  • the frequency is now set and tuned by rotating the setting element 7, as a result of which the setting element 7 with the dielectric tuning element 17 can be set in the interior of the inner conductor 3 at different axial heights relative to the inner conductor 3 in accordance with the double arrow position 21.
  • the upper end of the inner conductor 3, based on the height of the outer conductor 1, comes to lie about 10 to 20% of the axial length of the outer conductor below the upper edge 23 of the outer conductor 1 and thus below the electrically conductive cover 25.
  • the dielectric tuning element 17 projects, for example, slightly beyond the upper edge 27 of the inner conductor 3.
  • the capacitance between the open end of the inner conductor and the housing cover and thus the resonance frequency can be changed and optimally adjusted and adjusted.
  • the dielectric tuning element 17 does not touch the inner conductor 3 itself. If the tuning element is only attached via the adjusting element 7 via the thread engagement provided there, which in the exemplary embodiment shown takes place in the lower region of the inner conductor 3, preferably even only in the bottom region or in the region of the inner conductor 3 adjoining it, no capacities become undefined - And thus the frequency behavior adversely affecting undefined contacts created at the points of contact.
  • the structure shown comprises yet another materiality ⁇ handy advantage since temperature compensation is possible.
  • a dielectric tuning element is selected with an expansion temperature coefficient that is smaller than the temperature coefficient of the outer and / or inner conductor 1, 3 of the coaxial filter.
  • the inner and outer conductors become longer, to a greater extent than the length of the dielectric tuning element changes.
  • the resulting capacitance between the open end of the inner conductor on the housing cover decreases when the temperature rises, since the dielectric tuning element 17 does not expand to the same extent in terms of an increase in length as the inner and / or outer conductor that the frequency reduction resulting from the greater length increase of the inner and / or outer conductor can be compensated for by the simultaneous reduction in capacity.
  • This behavior can be optimized by selecting a suitable dielectric material for the tuning element 17.
  • Dielectric materials consisting of ceramic are particularly suitable for this. Materials that have a very low coefficient of thermal expansion and a low temperature coefficient of the relative dielectric constant are suitable.

Abstract

The invention relates to an improved high-frequency coaxial-type filter which consists of one or more resonators or coaxial filters and which is characterised by: an electrically conductive external conductor (1); an electrically conductive internal conductor (3); a floor (5) which electrically connects the external and internal conductors (1, 3); a housing cover (25) which is opposite the floor (5) and which covers the high frequency filter; and an adjusting or modulating element (17) which is located in or is plunged into the internal conductor (3) at different relative heights in relation thereto; the adjusting element (7) comprises a plunger or modulating element (17), consisting of dielectric material and the plunger or modulating element (17) is supported at a point which is offset in relation to the housing cover (25).

Description

HochfrequenzfilterHigh frequency filter
Die Erfindung betrifft ein Hochfrequenzfilter in koaxialer Bauweise nach dem Oberbegriff des Anspruches 1.The invention relates to a high-frequency filter in a coaxial design according to the preamble of claim 1.
Ein gattungsbildendes Hochfrequenzfilter kann aus einem oder mehreren Einzelresonatoren in Koaxialtechnik bestehen.A generic high-frequency filter can consist of one or more individual resonators in coaxial technology.
Derartige koaxial aufgebaute Hochfrequenzfilter werden in der Regel in funktechnischen Anlagen, beispielsweise im mobilen Funkbereich eingesetzt. Sie können dort z.B. in Basisstationen für den Mobilfunk verwendet werden, und zwar zur Selektion definierter Sende- und Empfangsbänder.Such coaxially constructed high-frequency filters are generally used in radio engineering systems, for example in the mobile radio field. You can e.g. are used in base stations for mobile radio, specifically for the selection of defined transmission and reception bands.
Aus der DE 21 36 728 AI ist ein koaxialer Resonator be¬ kannt, der ein zylinderförmiges mit einem Boden verschlossenes Gehäuse und ein Innenleiterrohr umfasst, welches koaxial zum Außenleiter sitzt. Das zylindrisch geformte Innenleiterrohr nimmt einen zylindrischen Innenleiter- abschnitt auf, der in dem Innenleiterrohr gleitet. Durch Verschiebungen des Endabschnitts dieses Innenleiterab- schnittes gegenüber dem Innenleiterrohr wird eine Resonanzabstimmung bezüglich der jeweiligen Frequenz vorgenom- men. Der Innenleiter ist dabei in Gestalt einer am Ende geschlossenen Hülse ausgebildet, die am oberen offenen Ende des Außenleiterrohres im Bereich eines anzubringenden Deckels gehalten und verankert ist.AI from DE 21 36 728 a known coaxial resonator be ¬, which comprises a cylindrical sealed housing with a bottom and an inner conductor tube, which is seated coaxially to the outer conductor. The cylindrically shaped inner conductor tube takes a cylindrical inner conductor section that slides in the inner conductor tube. By displacing the end section of this inner conductor section relative to the inner conductor tube, resonance tuning is carried out with respect to the respective frequency. The inner conductor is designed in the form of a sleeve which is closed at the end and which is held and anchored at the upper open end of the outer conductor tube in the region of a cover to be attached.
Darüber hinaus ist auch ein weiteres Hochfrequenzfilter bekannt, welches zur Abstimmung des jeweils betreffenden Frequenzbandes ein Schraubelement verwendet, das am Deckel des von seiner Grundstruktur zylinderförmig aufgebauten Einzelresonators angeordnet ist, und durch Ein- und Aus- drehen unterschiedlich tief in den Innenleiter des koaxialen Einzelresonators eindringt. Auch dadurch erfolgt, wie bei der DE 21 36 728 eine Kapazitätsänderung des Resonators und in Folge der Kapazitätsänderung eine Frequenzänderung .In addition, a further high-frequency filter is known, which uses a screw element to tune the frequency band in question, which is arranged on the cover of the individual resonator with a cylindrical structure, and penetrates to different depths into the inner conductor of the coaxial individual resonator by screwing in and out . This also results in a change in capacitance of the resonator, as in DE 21 36 728, and a change in frequency as a result of the change in capacitance.
Schließlich ist grundsätzlich auch aus der EP 0 068 919 AI ein Hochfrequenzresonator bekannt, der eine quer zur Resonatorlängsachse verlaufende Einsteileinrichtung aufweist, die von außen her durch die Wandung des Resonators hin- durch unterschiedlich weit radial ein- und ausdrehbar ist. Im Inneren weist dazu diese Einsteileinrichtung einen quer zur Axialrichtung des Resonators verlaufenden Stift aus dielektrischem Material auf, so dass durch Verstellung der EinStelleinrichtung und Radialverlagerung des erwähnten Stiftes aus dielektrischem Material eine Kapazitäts- und Frequenzänderung durchführbar ist.Finally, a high-frequency resonator is also known in principle from EP 0 068 919 A1, which has a setting device which runs transversely to the longitudinal axis of the resonator and can be radially screwed in and out differently from the outside through the wall of the resonator. To this end, this adjusting device has a pin made of dielectric material running transversely to the axial direction of the resonator, so that by adjusting the adjusting device and radial displacement of the pin made of dielectric material, a capacitance and Frequency change is feasible.
Die bisherigen Hochfrequenzfilter in der geschilderten koaxialen Bauweise weisen jedoch Nachteile auf.However, the previous high-frequency filters in the coaxial design described have disadvantages.
Nachteilig an der erläuterten AbStimmausführung ist, dass Komponenten zur Abstimmung der Resonanzfrequenz die Homogenität der elektrisch leitenden Oberfläche im Filterinneren (beispielsweise Schleifkontakte, Lötstellen, Über- gangsbereiche verschiedener Materialien etc.) beeinträchtigen und durch Undefinierte Kontakte an den betreffenden Berührungsstellen eine nachteilige Veränderung des Frequenzverhaltens gegeben ist (Intermodulation) .A disadvantage of the tuning configuration explained is that components for tuning the resonance frequency impair the homogeneity of the electrically conductive surface in the interior of the filter (for example sliding contacts, solder joints, transition areas of different materials, etc.) and that there is a disadvantageous change in the frequency response due to undefined contacts at the relevant contact points is (intermodulation).
Zudem erfordert die Abstimmeinrichtung einen nicht zu vernachlässigenden Platzbedarf.In addition, the tuning device requires a not insignificant space requirement.
Als weiterer Nachteil ist anzumerken, dass eine Tempera- turveränderung sich auf das Frequenzverhalten auswirkt.Another disadvantage is that a change in temperature affects the frequency response.
Aufgabe der vorliegenden Erfindung ist es, ein demgegenüber verbessertes Hochfrequenzfilter in koaxialer Bauweise zu schaffen.The object of the present invention is to provide an improved high-frequency filter in a coaxial design.
Die Aufgabe wird erfindungsgemäß entsprechend den im An¬ spruch 1 angegebenen Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved according to the invention according to the features specified in the At ¬ challenging first Advantageous embodiments of the invention are specified in the subclaims.
Die vorliegende Erfindung schafft mit einfachen Mitteln eine deutliche Verbesserung gegenüber herkömmlichen Hochfrequenzfiltern oder Koaxialfiltern.The present invention provides simple means a significant improvement over conventional high-frequency filters or coaxial filters.
Durch Verwendung eines dielektrischen Abstimmelementes, welches in axialer Richtung in den Innenleiter des Koaxialfilters eintauchend in unterschiedlicher Höhenlage verstellbar ist, läßt sich eine problemlose Frequenzabstimmung vornehmen, ohne dass dadurch Undefinierte Kontakte mit der Folge einer unerwünschten passiven Intermodulation entstehen können.By using a dielectric tuning element, which is adjustable in the axial direction by immersing in the inner conductor of the coaxial filter at different heights, a problem-free frequency tuning can be carried out without indefinite contacts resulting in undesired passive intermodulation.
In einer bevorzugten Ausführungsform der Erfindung ist dabei das aus einem dielektrischen Material bestehende und in den koaxialen Innenleiter eintauchende Abstimmelement nicht wie im Stand der Technik am Deckel der Hochfrequenz- filtereinrichtung verankert. Bevorzugt erfolgt die Verankerung so, dass die resultierende Kapazität zwischen dem offenen Ende des Innenleiters und dem Gehäusedeckel bei einer Temperaturerhöhung abnimmt und damit eine frequenz- bezogene Temperaturkompensation des Filters zur Folge hat.In a preferred embodiment of the invention, the tuning element consisting of a dielectric material and immersed in the coaxial inner conductor is not anchored to the cover of the high-frequency filter device as in the prior art. The anchoring is preferably carried out in such a way that the resulting capacitance between the open end of the inner conductor and the housing cover decreases when the temperature rises and thus results in frequency-related temperature compensation of the filter.
Bevorzugt ist dabei, dass die elektrischen Abstimmelemente im Innenleiter, vorzugsweise im Bereich des Bodens des Koaxialfilterelements, in unterschiedlicher Höhenlage verstellbar abgestützt sind, um die vorstehend erläuterte Temperaturkompensation zu ermöglichen.It is preferred that the electrical tuning elements in the inner conductor, preferably in the region of the bottom of the coaxial filter element, are supported so as to be adjustable at different heights in order to enable the temperature compensation explained above.
Als besonders günstig hat sich dabei erwiesen, ein dielektrisches Material zu verwenden, was einen möglichst gerin- gen thermischen Ausdehnungskoeffizient aufweist. Bevorzugt wird ein Material verwendet, welches einen negativen Temperaturkoeffizienten der Dielektrizitätskonstanten aufweist .It has proven to be particularly advantageous to use a dielectric material which has a thermal expansion coefficient that is as low as possible. Prefers a material is used which has a negative temperature coefficient of the dielectric constant.
Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert . Dabei zeigen im einzelnenThe invention is explained in more detail below with reference to drawings. Show in detail
Figur 1: einen schematischen axialen Querschnitt durch ein erfindungsgemäßes Hochfrequenz- filter in Form eines Einzelresonators; undFIG. 1 shows a schematic axial cross section through a high-frequency filter according to the invention in the form of a single resonator; and
Figur 2: einen schematischen Horizontalquerschnitt längs der Linie II-III in Figur 1.FIG. 2: a schematic horizontal cross section along the line II-III in FIG. 1.
In Figur 1 und 2 ist im axialen Längsschnitt bzw. im Querschnitt dazu in schematischer Wiedergabe ein Einzelresonator in Koaxialtechnik gezeigt, der nachfolgend auch kurz als Koaxialresonator oder Koaxialfilter bezeichnet wird.In Figures 1 and 2, an individual resonator in coaxial technology is shown in axial longitudinal section or in cross section thereto, which is also referred to below as a coaxial resonator or coaxial filter.
Dieser besteht aus einem Außenleiter 1, einem im gezeigten Ausführungsbeispiel konzentrisch oder koaxial dazu angeordneten Innenleiter 3 und einem Boden 5, über den der elektrisch leitende Außenleiter 1 und der elektrisch leitende Innenleiter 3 elektrisch miteinander in Verbindung stehen.This consists of an outer conductor 1, an inner conductor 3 arranged concentrically or coaxially thereto in the exemplary embodiment shown, and a base 5, via which the electrically conductive outer conductor 1 and the electrically conductive inner conductor 3 are electrically connected to one another.
Im Inneren des Innenleiters 3 ist im gezeigten Ausführungsbeispiel im Bodenbereich ein Einstellelement 7 vorgesehen, welches im gezeigten Ausführungsbeispiel aus einem Gewindeteller oder -topf 7' besteht. Dieser Gewinde- teller oder Gewindetopf 7 ' weist in seinem Außenumfang ein Außengewinde 9 auf, welches mit einem entsprechenden Innengewinde 11 in Eingriff steht, welches zumindest in einer ausreichenden Axiallänge an der Innenseite des In- nenleiters 3 und/oder an der Innenseite einer axial dazu im Boden 5 vorgesehenen Ausnehmung 13 vorgesehen ist. Im gezeigten Ausführungsbeispiel hat der Gewindeteller- oder -topf 7' einen Verdreh- oder Mitnahmeansatz 15, im gezeigten Ausführungsbeispiel in der Form eines Schlitzes, um hier beispielsweise mittels eines Schraubenziehers eine Verdrehung des Einstellelementes 7 und damit eine axiale Verlagerung desselben bezüglich des Innenleiters vorzunehmen.In the embodiment shown in the bottom of the inner conductor 3, an adjusting element 7 is provided, which in the embodiment shown consists of a threaded plate or pot 7 '. This thread The plate or threaded pot 7 'has an external thread 9 in its outer circumference, which is in engagement with a corresponding internal thread 11, which has at least a sufficient axial length on the inside of the inner conductor 3 and / or on the inside of one axially in the bottom 5 provided recess 13 is provided. In the exemplary embodiment shown, the threaded plate or pot 7 'has a twisting or driving attachment 15, in the exemplary embodiment shown in the form of a slot, for example in order to twist the adjusting element 7 and thus axially shift the same with respect to the inner conductor by means of a screwdriver.
Auf diesem Einstellelement 7 ist ein stiftförmiges Eintauch- oder Abstimmelement 17 festsitzend angeordnet, welches im gezeigten Ausführungsbeispiel stift- oder zy- linderförmig ausgestaltet ist. Die Länge, der Durchmesser, die Dielektrizitätskonstante und der Befestigungspunkt des dielektrischen Abstimmelementes oder Zylinders 17 sind dabei so gewählt, dass darüber die gewünschte Resonanzfrequenz im gewünschten Frequenzbereich eingestellt werden kann.A pin-shaped immersion or tuning element 17 is fixedly arranged on this adjusting element 7, which is designed in the form of a pin or a cylinder in the exemplary embodiment shown. The length, the diameter, the dielectric constant and the attachment point of the dielectric tuning element or cylinder 17 are selected so that the desired resonance frequency can be set in the desired frequency range.
Einstellung und Abstimmung der Frequenz erfolgt nun durch Verdrehung des Einstellelementes 7, wodurch das Einstell - element 7 mit dem dielektrischen Abstimmelement 17 im Inneren des Innenleiters 3 in unterschiedlicher Axialhöhe relativ zum Innenleiter 3 entsprechend der Doppelpfeildar- Stellung 21 eingestellt werden kann. Im gezeigten Ausführungsbeispiel ist ersichtlich, dass das obere Ende des Innenleiters 3 bezogen auf die Höhe des Außenleiters 1 etwa 10 bis 20% der axialen Länge des Außenleiters unterhalb des oberen Randes 23 des Außenleiters 1 und damit unterhalb des elektrisch leitenden Deckels 25 zum Liegen kommt. Das dielektrische Abstimmelement 17 steht dabei beispielsweise in geringem Maße über den oberen Rand 27 des Innenleiters 3 über.The frequency is now set and tuned by rotating the setting element 7, as a result of which the setting element 7 with the dielectric tuning element 17 can be set in the interior of the inner conductor 3 at different axial heights relative to the inner conductor 3 in accordance with the double arrow position 21. In the exemplary embodiment shown, it can be seen that the upper end of the inner conductor 3, based on the height of the outer conductor 1, comes to lie about 10 to 20% of the axial length of the outer conductor below the upper edge 23 of the outer conductor 1 and thus below the electrically conductive cover 25. The dielectric tuning element 17 projects, for example, slightly beyond the upper edge 27 of the inner conductor 3.
Durch Verdrehung des Einstellelementes 7 und damit der Lageveränderung des Einstellelementes 17 kann die Kapazität zwischen dem offenen Ende des Innenleiters und dem Gehäusedeckel und damit die Resonanzfrequenz verändert und optimal eingestellt und abgestimmt werden.By turning the adjusting element 7 and thus the change in position of the adjusting element 17, the capacitance between the open end of the inner conductor and the housing cover and thus the resonance frequency can be changed and optimally adjusted and adjusted.
Wie aus dem gezeigten Ausführungsbeispiel auch ersichtlich ist, berührt das dielektrische Abstimmelement 17 den Innenleiter 3 selbst nicht. Sofern die Befestigung des Abstimmelementes nur über das Einstellelement 7 über den dort vorgesehenen Gewindeeingriff erfolgt, der im gezeigten Ausführungsbeispiel im unteren Bereich des Innenleiters 3 , bevorzugt sogar nur im Bodenbereich oder in dem daran angrenzenden Bereich des Innenleiters 3 erfolgt, werden keine Undefinierten, das Kapazitäts- und damit das Frequenzverhalten nachteilig beeinträchtigende Undefinierte Kontakte an den Berührungsstellen geschaffen.As can also be seen from the exemplary embodiment shown, the dielectric tuning element 17 does not touch the inner conductor 3 itself. If the tuning element is only attached via the adjusting element 7 via the thread engagement provided there, which in the exemplary embodiment shown takes place in the lower region of the inner conductor 3, preferably even only in the bottom region or in the region of the inner conductor 3 adjoining it, no capacities become undefined - And thus the frequency behavior adversely affecting undefined contacts created at the points of contact.
Der gezeigte Aufbau weist aber noch einen weiteren wesent¬ lichen Vorteil auf, da eine Temperaturkompensation möglich ist. Dazu wird ein dielektrisches Abstimmelement mit einem Ausdehnungs-Temperaturkoeffizient gewählt, der kleiner ist als der Temperaturkoeffizient des Außen- und/oder Innenleiters 1, 3 des Koaxialfilters. Bei einer Temperatur- erhöhung wird dabei der Innen- und Außenleiter länger, und zwar in einem stärkeren Maße, als sich die Länge des dielektrischen Abstimmelementes ändert. Dabei nimmt die resultierende Kapazität zwischen dem offenen Ende des Innenleiters an dem Gehäusedeckel bei einer Temperatur- erhöhung ab, da sich nämlich das dielektrische Abstimmelement 17 nicht im gleichen Maße im Sinne einer Längenvergrößerung ausdehnt, wie der Innen- und/oder Außenleiter, mit der Folge, dass sich die durch die stärkere Längenvergrößerung des Innen- und/oder Außenleiters an sich ergebende Frequenzerniedrigung durch die gleichzeitig bewirkte Kapazitätserniedrigung kompensiert werden kann. Dieses Verhalten kann durchaus durch Auswahl eines geeigneten dielektrischen Materiales für das Abstimmelement 17 optimiert werden. Besonders geeignet sind dazu dielek- trische Materialien bestehend aus Keramik. Dabei eignen sich Materialien, die einen sehr niedrigen thermischen Ausdehnungskoeffizienten aufweisen sowie einen niedrigen Temperaturkoeffizienten der relativen Dielektrizitätskonstanten. However, the structure shown comprises yet another materiality ¬ handy advantage since temperature compensation is possible. For this purpose, a dielectric tuning element is selected with an expansion temperature coefficient that is smaller than the temperature coefficient of the outer and / or inner conductor 1, 3 of the coaxial filter. When the temperature rises, the inner and outer conductors become longer, to a greater extent than the length of the dielectric tuning element changes. The resulting capacitance between the open end of the inner conductor on the housing cover decreases when the temperature rises, since the dielectric tuning element 17 does not expand to the same extent in terms of an increase in length as the inner and / or outer conductor that the frequency reduction resulting from the greater length increase of the inner and / or outer conductor can be compensated for by the simultaneous reduction in capacity. This behavior can be optimized by selecting a suitable dielectric material for the tuning element 17. Dielectric materials consisting of ceramic are particularly suitable for this. Materials that have a very low coefficient of thermal expansion and a low temperature coefficient of the relative dielectric constant are suitable.

Claims

Patentansprüche: Claims:
1. Hochfrequenzfilter in koaxialer Bauweise, bestehend aus einem oder mehreren Resonatoren, die folgende Merkmale aufweisen1. High-frequency filter in a coaxial design, consisting of one or more resonators, which have the following features
- mit einem elektrisch leitenden Außenleiter (1) - mit einem elektrisch leitenden Innenleiter (3)- with an electrically conductive outer conductor (1) - with an electrically conductive inner conductor (3)
- mit einem den Außen- und Innenleiter (1, 3) elektrisch verbindenden Boden (5)- With a bottom (5) electrically connecting the outer and inner conductors (1, 3)
- einen das Hochfrequenzfilter gegenüber vom Boden (5) abdeckenden Gehäusedeckel (25) - und mit einem die Resonanzfrequenz verändernden Eintauch- oder Abstimmelement (17) , welches bezogen auf den Innenleiter (3) in unterschiedlicher Axial- oder Höhenlage in diesem eintauchend oder in diesem befindlich ist, gekennzeichnet durch die folgenden weiteren Merkmale- A housing cover (25) covering the high-frequency filter opposite the bottom (5) - and with an immersion or tuning element (17) which changes the resonance frequency and which immerses in or in this in relation to the inner conductor (3) in different axial or height positions is located, characterized by the following further features
- das Einstellelement (7) umfaßt ein Eintauch- oder Abstimmelement (17) aus dielektrischem Material, und- The adjusting element (7) comprises an immersion or tuning element (17) made of dielectric material, and
- das Eintauch- oder Abstimmelement (17) ist an einer Abstützstelle abgestützt, die zum Gehäusedeckel (25) versetzt liegt. - The immersion or tuning element (17) is supported at a support point which is offset from the housing cover (25).
2. Hochfrequenzfilter nach Anspruch 1, dadurch gekennzeichnet, dass das Eintauch- oder Abstimmelement (17) an einer im Inneren des Innenleiters (3) und/oder im Bereich einer Ausnehmung (13) des Bodens (5) gehalten und abge- stützt ist.2. High-frequency filter according to claim 1, characterized in that the immersion or tuning element (17) is held and supported on an inside of the inner conductor (3) and / or in the region of a recess (13) in the bottom (5).
3. Hochfrequenzfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Einstellelement (7) einen Gewindeteller oder -topf (7') aufweist, welcher mit einem Außengewinde (9) versehen ist, worüber das Einstellelement (7) mit einem Innengewinde (11) im Inneren des Innenleiters (3) und/oder der Ausnehmung (13) des Bodens (5) verbunden und gehalten ist .3. High-frequency filter according to claim 1 or 2, characterized in that the adjusting element (7) has a threaded plate or pot (7 ') which is provided with an external thread (9), via which the adjusting element (7) with an internal thread (11 ) is connected and held in the interior of the inner conductor (3) and / or the recess (13) of the base (5).
4. Hochfrequenzfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass auf dem Einstellelement (7) das elektrische Eintauch- oder Abstimmelement (17) angeordnet und mit dem Einstellelement (7) mit verstellbar befestigt ist.4. High-frequency filter according to one of claims 1 to 3, characterized in that the electrical immersion or tuning element (17) is arranged on the adjusting element (7) and is fastened with the adjusting element (7) so as to be adjustable.
5. Hochfrequenzfilter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das dielektrische Eintauchoder Abstimmelement (17) zumindest in geringem Maße über den oberen Rand (27) des Innenleiters (3) übersteht oder unterhalb davon endet.5. High-frequency filter according to one of claims 1 to 4, characterized in that the dielectric immersion or tuning element (17) projects at least to a small extent over the upper edge (27) of the inner conductor (3) or ends below it.
6. Hochfrequenzfilter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der thermische Ausdehnungskoeffizient des dielektrischen Eintauch- oder Abstimm- elementes (17) von dem thermischen Ausdehnungskoeffizienten des Innen- oder Außenleiters (3, 1) abweicht.6. High-frequency filter according to one of claims 1 to 5, characterized in that the thermal expansion coefficient of the dielectric immersion or tuning element (17) deviates from the coefficient of thermal expansion of the inner or outer conductor (3, 1).
7. Hochfrequenzfilter nach Anspruch 6, dadurch gekenn- zeichnet, dass der thermische Ausdehnungskoeffizient des dielektrischen Eintauch- oder Abstimmelementes (17) kleiner ist als der thermische Ausdehnungskoeffizient des Innen- oder Außenleiters (3,1).7. High-frequency filter according to claim 6, characterized in that the thermal expansion coefficient of the dielectric immersion or tuning element (17) is smaller than the thermal expansion coefficient of the inner or outer conductor (3,1).
8. Hochfrequenzfilter nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Temperaturkoeffizient der Dielektrizitätskonstanten des Eintauch- oder Abstimmelementes (17) negativ ist.8. High-frequency filter according to claim 6 or 7, characterized in that the temperature coefficient of the dielectric constant of the immersion or tuning element (17) is negative.
9. Hochfrequenzfilter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das dielektrische Eintauchoder Abstimmelement (17) aus einem keramischen Material besteht .9. High-frequency filter according to one of claims 1 to 8, characterized in that the dielectric immersion or tuning element (17) consists of a ceramic material.
10. Hochfrequenzfilter nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das dielektrische Eintauchoder Abstimmelement (17) aus einer Aluminiumoxid-Keramik, insbesondere einer Al203-Keramik besteht.10. High-frequency filter according to one of claims 1 to 9, characterized in that the dielectric immersion or tuning element (17) consists of an aluminum oxide ceramic, in particular an Al 2 0 3 ceramic.
11. Hochfrequenzfilter nach einem der Anspprüche 2 bis 10, dadurch gekennzeichnet, dass der Gewindeteller oder -topf (7') aus Metall besteht. 11. High-frequency filter according to one of claims 2 to 10, characterized in that the threaded plate or cup (7 ') consists of metal.
PCT/EP2000/003302 1999-04-15 2000-04-13 High-frequency filter WO2000064001A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
KR1020017012113A KR20010112362A (en) 1999-04-15 2000-04-13 High-frequency filter
DE50000248T DE50000248D1 (en) 1999-04-15 2000-04-13 HIGH FREQUENCY FILTER
AT00925207T ATE219862T1 (en) 1999-04-15 2000-04-13 HIGH FREQUENCY FILTER
JP2000613031A JP2002542695A (en) 1999-04-15 2000-04-13 High frequency filter
AU44004/00A AU769264B2 (en) 1999-04-15 2000-04-13 High-frequency filter
DK00925207T DK1169747T3 (en) 1999-04-15 2000-04-13 High frequency
CA002370133A CA2370133A1 (en) 1999-04-15 2000-04-13 High-frequency filter
BR0009723-3A BR0009723A (en) 1999-04-15 2000-04-13 High frequency filters
NZ514485A NZ514485A (en) 1999-04-15 2000-04-13 High-frequency filter of a coaxial design
EP00925207A EP1169747B1 (en) 1999-04-15 2000-04-13 High-frequency filter
HK02106039A HK1044633A1 (en) 1999-04-15 2002-08-19 High-frequency filter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19917087A DE19917087C2 (en) 1999-04-15 1999-04-15 High frequency filter
DE19917087.8 1999-04-15

Publications (1)

Publication Number Publication Date
WO2000064001A1 true WO2000064001A1 (en) 2000-10-26

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EP (1) EP1169747B1 (en)
JP (1) JP2002542695A (en)
KR (1) KR20010112362A (en)
CN (1) CN1166027C (en)
AT (1) ATE219862T1 (en)
AU (1) AU769264B2 (en)
BR (1) BR0009723A (en)
CA (1) CA2370133A1 (en)
DE (2) DE19917087C2 (en)
DK (1) DK1169747T3 (en)
HK (1) HK1044633A1 (en)
NZ (1) NZ514485A (en)
WO (1) WO2000064001A1 (en)

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WO2004084340A1 (en) * 2003-03-18 2004-09-30 Filtronic Comtek Oy Resonator filter
GB2456738A (en) * 2007-01-15 2009-07-29 Isotek Electronics Ltd TEM Mode Resonator
WO2014063829A1 (en) * 2012-10-25 2014-05-01 Kathrein-Werke Kg Tunable high frequency filter

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KR100769657B1 (en) * 2003-08-23 2007-10-23 주식회사 케이엠더블유 Radio frequency band variable filter
DE102004010683B3 (en) 2004-03-04 2005-09-08 Kathrein-Werke Kg High frequency filter in coaxial resonator configuration, used in mobile telephone, includes dielectric layer between cover and free end of inner conducting tube
FI20041546A (en) * 2004-11-30 2006-05-31 Filtronic Comtek Oy Temperature compensated resonator
EP1760824B1 (en) * 2005-09-06 2010-08-11 Panasonic Corporation Temperature compensation of combline resonators using composite inner conductor
DE102006033704B3 (en) 2006-07-20 2008-01-03 Kathrein-Werke Kg High frequency coaxial type filter comprises one or multiple resonators, which has housing with inner space, and housing has two rear walls, which lies together and offset in axial direction
KR101012776B1 (en) * 2010-08-26 2011-02-08 주식회사 이너트론 Multi-stage resonator and housing filter using the same
DE102010056048A1 (en) * 2010-12-23 2012-06-28 Kathrein-Werke Kg Tunable high frequency filter
DE102014001917A1 (en) 2014-02-13 2015-08-13 Kathrein-Werke Kg High frequency filter in coaxial design
KR101730084B1 (en) 2015-04-20 2017-04-25 주식회사 케이엠더블유 Radio frequency filter with cavity structure
KR101906464B1 (en) * 2017-01-11 2018-10-10 (주)웨이브텍 Microwave Resonator
WO2019024082A1 (en) * 2017-08-04 2019-02-07 Nokia Solutions And Networks Oy Bandpass filters and associated methods.
KR101927956B1 (en) 2017-11-06 2018-12-12 주식회사 이엠따블유 Tunable cavity filter having variable resonance element
KR102285497B1 (en) 2020-05-14 2021-08-03 주식회사 엘트로닉스 Coaxial microwave filter and communication device with the same

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WO2004084340A1 (en) * 2003-03-18 2004-09-30 Filtronic Comtek Oy Resonator filter
US7180391B2 (en) 2003-03-18 2007-02-20 Filtronic Comtek Oy Resonator filter
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Also Published As

Publication number Publication date
DK1169747T3 (en) 2002-10-14
CA2370133A1 (en) 2000-10-26
AU769264B2 (en) 2004-01-22
EP1169747A1 (en) 2002-01-09
NZ514485A (en) 2003-09-26
KR20010112362A (en) 2001-12-20
HK1044633A1 (en) 2002-10-25
ATE219862T1 (en) 2002-07-15
BR0009723A (en) 2002-01-02
DE19917087C2 (en) 2001-07-26
JP2002542695A (en) 2002-12-10
DE19917087A1 (en) 2000-11-02
CN1166027C (en) 2004-09-08
EP1169747B1 (en) 2002-06-26
AU4400400A (en) 2000-11-02
DE50000248D1 (en) 2002-08-01
CN1347578A (en) 2002-05-01

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