EP1776733A1 - High-frequency filter - Google Patents

High-frequency filter

Info

Publication number
EP1776733A1
EP1776733A1 EP05786313A EP05786313A EP1776733A1 EP 1776733 A1 EP1776733 A1 EP 1776733A1 EP 05786313 A EP05786313 A EP 05786313A EP 05786313 A EP05786313 A EP 05786313A EP 1776733 A1 EP1776733 A1 EP 1776733A1
Authority
EP
European Patent Office
Prior art keywords
pot
frequency filter
filter according
conductor
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05786313A
Other languages
German (de)
French (fr)
Other versions
EP1776733B1 (en
Inventor
Gerhard Schreibvogel
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.)
Kathrein Mobilcom Austria GmbH
Original Assignee
Kathrein Austria 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 Kathrein Austria GmbH filed Critical Kathrein Austria GmbH
Publication of EP1776733A1 publication Critical patent/EP1776733A1/en
Application granted granted Critical
Publication of EP1776733B1 publication Critical patent/EP1776733B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • 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 according to the preamble of claim 1.
  • a common antenna is often used for transmit and receive signals.
  • the transmit and receive signals each use different frequency ranges, and the antenna must be capable of transmitting and receiving in both frequency ranges.
  • a suitable frequency filtering is required, with which on the one hand the transmission signal from the transmitter to the antenna and on the other hand the received signals are transmitted from the antenna to the receiver.
  • high-frequency filters are used today.
  • High-frequency filters in coaxial design are known from the prior art.
  • An example of such a coaxial resonator can be found in the prior art publication "Theory and Design of Microwave Filters, "Ian Hunter, Electromagnetic Waves Series 48, Release 2001, page 197.
  • Such coaxial resonators are narrow-band, steep-flank filters which are typically metallic cast or milled parts with resonator cavities that are electrically connected to metal wires
  • These conventional coaxial resonators have the disadvantage that they are relatively expensive to manufacture and have large dimensions.
  • Strite Strite Appendix
  • a conventional stripline filter is shown for example in the prior publication "Microstrip Filters for RF / Microwave Applications", Jia-Sheng Hong and M. J. Lancaster, publication year 2001, in particular in Figure 6.5 on page 170.
  • an electrical line in Stsammlung eins ⁇ technology is reproduced, wherein at a small distance adjacent to this line more U-shaped resonators or straight, i. strip-shaped resonators are vor ⁇ seen.
  • the straight resonators or the limbs of the U-shaped resonators are perpendicular to the strip-line-shaped line.
  • the lateral distance of the individual resonators in the direction of the stripline is in each case ⁇ / 4.
  • Stripline filters are much easier to manufacture than coaxial type filters, but stripline filters are much more broadband.
  • the object of the invention is to provide a narrow band high frequency filter which is easier to produce than conventional coaxial high frequency filters is and has a more compact design.
  • the high-frequency filter according to the invention comprises a substrate made of dielectric material having a first side and an opposite second side, wherein at least one electrically conductive strip conductor is applied to the first side of the substrate.
  • This strip conductor is electrically coupled to at least one resonator, wherein the resonator is not designed as a strip conductor, but is a coaxial resonator with an outer conductor pot and a substantially rod-shaped inner conductor arranged coaxially in the outer conductor pot.
  • the outer conductor pot is galvanically connected to a ground plane.
  • the inner conductor is galvanically and / or capacitively connected to the pot bottom of the outer conductor pot at a first end, a galvanic connection being used in particular in the embodiment of the resonator as a ⁇ / 4 resonator and in the embodiment of the resonator as ⁇ / 2 resonator preferably a capacitive coupling is used.
  • the resonator is electrically coupled to the at least one strip conductor via an opposite second end of the inner conductor. In this way, a high-frequency filter is created, which essentially corresponds in terms of its frequency response to a coaxial filter according to the conventional design, ie the filter has a narrow frequency band.
  • the resonator cavities are not formed in metallic cast or milled parts, but separate resonators are present used from outer conductor pot and inner conductor, which couple in a simple manner by means of the stripline technology to an electrical line.
  • This high-frequency filter is compared to conventional coaxial filter much cheaper to produce, since the individual resonators can be manufactured separately with inexpensive methods and then coupled with a likewise separately manufactured strip conductor on a substrate NEN NEN.
  • the high-frequency filter according to the invention thus combines the stripline technique with resonators according to the coaxial design, thereby creating a filter which can be manufactured more simply than conventional coaxial filters and, moreover, has a more compact design.
  • air is arranged as a dielectric between the inner conductor and the side wall of the outer conductor pot.
  • the filter is constructed such that the resonator on the second side of the substrate, ie, on the side opposite to the "side with the applied strip conductor is arranged.
  • the Masse ⁇ surface is in particular a substantially continuous conductive layer on the second 1, wherein the edge of the opening of the outer conductor pot opposite the bottom of the pot is galvanically connected to the conductive layer, in particular soldered to the latter, wherein preferably a wave soldering is used, in one preferred embodiment the conductive layer has ring-shaped Recesses, which expose the dielectric material of the substrate, wherein the edge of the opening opposite the pot bottom opening of the originallyleiter ⁇ pot is arranged around the annular recess around.
  • the second end of the inner conductor, with which the coupling is achieved to the strip conductor, is preferably mounted on the substrate.
  • the substrate on the second side preferably has a recess and / or a hole into which the second end of the inner conductor is inserted and in particular soldered there.
  • the first end of the inner conductor is preferably inserted into a recess. and / or inserted into a hole in the bottom of the outer conductor pot of the resonator and in particular soldered there and / or pressed.
  • the outer conductor pot and the inner conductor can thus be manufactured separately and only then galvanically connected to each other.
  • the axial direction of the resonator is substantially perpendicular to the first and / or second side of the substrate.
  • the outer conductor pot and / or the inner conductor can be manufactured in a simple manner.
  • these components may be turned metal parts, or the components may be plastic parts metallized on the outside and / or inside surface.
  • the resonator is capacitively and / or inductively coupled to the at least one strip conductor, wherein the strip conductor may, for example, have a meandering structure.
  • the strip conductor can include branches which form a circle and / or semicircle and / or a circular section, the second end of the inner conductor being arranged in each case in the middle.
  • a cover is provided on the first side of the substrate, wherein the cover preferably at least one substantially has axially aligned with a coaxial resonator Ab ⁇ tuning element for changing the electrical properties of the high-frequency filter.
  • the tuning element may be, for example, a metallic pin which can be displaced in the cover and / or a metallic screw which can be rotated in the cover.
  • resonators are arranged in the longitudinal direction next to the strip conductor, wherein the resonators may have different sizes.
  • the substrate is preferably a dielectric plate.
  • the resonators are in particular coupled to the strip conductor in such a way that a bandpass filter and / or a bandstop filter is formed.
  • the high-frequency filter preferably operates in the range of the 1800 MHz mobile radio frequency and / or the 2000 MHz mobile radio frequency.
  • FIG. 1 shows a perspective, partially cutaway top view of an embodiment of the high-frequency filter according to the invention
  • FIG. 2 shows a perspective, partially cut-away view from below of the high-frequency filter of FIG. 1; and FIG. 3 shows a plan view of an embodiment of a strip conductor used in the filter according to the invention.
  • the high-frequency filter shown in FIG. 1 comprises a dielectric substrate plate 1, on the upper side of which three identical coaxial resonators 2 are arranged. If appropriate, fewer or more resonators may also be arranged on the upper side, wherein in the case of more than three resonators, FIG. 1 shows only a partial section of the filter and the substrate plate continues with further resonators in the longitudinal direction.
  • the foremost coaxial resonator is shown in sectional view.
  • Each coaxial resonator comprises a cylindrical, cup-shaped outer conductor 3, which is, for example, a turned metal part. Alternatively, the outer conductor may be an injection-molded part whose outer and / or inner surface is metallized closed.
  • the outer conductor pot 3 is placed with its pot opening down on the upper side 1a of the substrate, so that the pot bottom 3a is spaced from the upper side 1a.
  • a cylindrical inner conductor rod 4 is concentrically arranged in its center, which is inserted at its upper end 4a into a corresponding hole in the pot bottom 3a and soldered or pressed there. Between réelleleiters- tab and the cylindrical side wall of the outer conductor pot air is provided as a dielectric.
  • the opposite lower end 4b of the cylindrical inner conductor bar 4 is inserted into a corresponding opening Ic in the substrate 1.
  • the upper side 1a of the dielectric substrate 1 is metallized substantially continuously and forms a ground surface 1a 'of the filter, but in the region of the circular pot openings of the outer conductor pots 3 ring-shaped.
  • shaped recesses Ib are provided, which expose the di ⁇ electrical material of the substrate 1.
  • the outer edge of each recess Ib terminates in each case with an edge of the pot opening of an outer conductor pot, wherein the edge of the pot opening on the outside of the outer conductor pot is galvanically connected to the metallized layer on the substrate, for example by means of wave soldering. In this way, the ground contact of the conspiracylei ⁇ terpot is made.
  • the interior of the annular recess Ib is adjoined by a circular metallized section Id, in the center of which is the opening Ic.
  • a protective cover 5 On the lower side Ie of the substrate 1 there is a protective cover 5.
  • the lower side Ie is partially subsequently also referred to as the first side Ie and the upper side Ia partly as the second side Ia.
  • FIG. 2 shows a perspective, partially sectioned view of the filter of Figure 1 from below.
  • the housing 5 is here shown in section, so that the structure of the bottom Ie of the substrate 1 is visible.
  • the strip conductor comprises straight sections 6a and circular branches 6b, in the center of which is in each case the opening Ic in which one end 4b of the inner conductor bar 4 is inserted.
  • the opening Ic is metallized on the side Ie, but the metal has no connection to the circular branches 6b.
  • the inner conductor bar is soldered to the bottom Ie at the opening Ic. As a result of the inner conductor inserted into the opening Ic, a capacitive coupling of the coaxial resonator 2 to the strip conductor 6 is achieved produced.
  • the cover 5 runs around the edge of the bottom ' Ie of the substrate 1, so that the entire underside is enclosed by the Abde ⁇ ckung.
  • a hole 5a is further provided, which is aligned with an underlying resonator 2 in the axial direction.
  • a tuning element can be used, which may be, for example, a ver ⁇ perpendicular to the substrate plate 1 slidable metallic bolt. The distance of this bolt to the bottom side Ie of the substrate plate 1 can be changed with the tuning element, whereby the Fre ⁇ quenz the filter can be influenced. In this case, more tuning elements can be provided, each tuning element being aligned with an underlying resonator in the axial direction.
  • the filter 1 and 2 is used, for example, as a band rejection filter for separating the 1800 MHz mobile frequency from the UMTS mobile frequency in the 2000 MHz range.
  • the filter is narrowband compared to conventional stripline filters and has steeper flanks. In terms of its frequency response, the filter thus corresponds to conventional coaxial filters in the form of metallic milling or cast parts.
  • the resonators 3 shown in FIGS. 1 and 2 are ⁇ / 4 resonators in which the length of the inner conductor bar 4 corresponds to one quarter of the wavelength ⁇ .
  • the inner conductor bar 4 is galvanically connected at its end 4a to the bottom of the pot 3a.
  • the resonators 3 it is also possible to use the resonators 3 as ⁇ / 2 resonators, in which the length of the inner conductor bar 4 the Half the wavelength ⁇ .
  • the end 4a of the inner conductor bar is capacitively coupled to the pot bottom, for example, by the end 4a is connected to a metallic disc whose size corresponds substantially to the size of the pot bottom 3a and which is spaced from the bottom of the pot.
  • the capacitive coupling acts as a short circuit at the resonant frequency.
  • FIG. 2 shows only one possible embodiment.
  • the stripline it is also possible for the stripline to be of meander-shaped configuration and for the circular branches 6b to be offset relative to the straight sections 6a.
  • the branches do not have to form a closed circle, but they can also comprise only sections of a circle.
  • FIG. 3 shows a plan view of the underside Ie of a substrate plate with such an alternative embodiment of the strip conductor. It can be seen that branches in the form of closed circles 6b and branches in the form of circular sections 6c are provided, wherein the branches are respectively connected via webs 6d to straight sections 6a of a meander-shaped strip conductor 6. Concentric to the branches 6b and 6c, respectively, the opening Ic is arranged, in which the end 4b of the inner conductor bar 4 is inserted.
  • the electrically conductive outer conductor pot 3 is electrically conductive at its region remote from the pot bottom 3a, in particular at its open upper edge region opposite the pot bottom 3a with the ground surface 1a, preferably at the entire circumferential edge verbun is the.
  • Coaxially with the inner conductor 4 is arranged, which is electrically or capacitively connected to the bottom of the pot 3a.
  • the electrical connection to the strip conductor 6 takes place via the inner conductor 4, ie in the embodiment shown only and exclusively via the inner conductor 4.
  • the inner conductor 4 ent removed to one end to which it is electrically or capacitively electrically connected to the pot bottom 3a is connected to the stripline.
  • this second connection is likewise galvanic or capacitive at the end of the inner conductor 4 opposite the pot bottom with the strip conductor 6.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention relates to a high-frequency filter that has the following features: a substrate is provided that is made of dielectric material and comprises a first face and an opposite second face; at least one stripline is applied to the first face of the substrate; at least one resonator is provided which is electrically coupled to the at least one stripline; a ground area is provided that is spaced apart from the stripline; the at least one resonator is embodied as a coaxial resonator comprising an outer conductor pot and a substantially rod-shaped inner conductor which is disposed coaxially in the outer conductor pot; the outer conductor pot is galvanically connected to the ground area; a first end of the inner conductor is galvanically connected to the bottom of the outer conductor pot; the resonator is electrically coupled to the at least one stripline via an opposite second end of the inner conductor.

Description

HochfrequenzfilterHigh frequency filter
Die Erfindung betrifft ein Hochfrequenzfilter nach dem Oberbegriff des Anspruches 1.The invention relates to a high-frequency filter according to the preamble of claim 1.
In funktechnischen Anlagen, insbesondere im Mobilfunk¬ bereich, wird häufig für Sende- und Empfangssignale eine gemeinsame Antenne benutzt. Dabei verwenden die Sende- und Empfangssigna'le jeweils unterschiedliche Frequenzbereiche, und die Antenne muss zum Senden und Empfangen in beiden Frequenzbereichen geeignet sein. Zur Trennung der Sende- und Empfangssignale ist deshalb eine geeignete Frequenz- Filterung erforderlich, mit der einerseits die Sendesigna¬ le vom Sender zur Antenne und andererseits die Empfangs¬ signale von der Antenne zum Empfänger weitergeleitet wer¬ den. Zur Aufteilung der Sende- und Empfangssignale werden heutzutage Hochfrequenzfilter eingesetzt.In radio systems, especially in Mobilfunk¬ area, a common antenna is often used for transmit and receive signals. The transmit and receive signals each use different frequency ranges, and the antenna must be capable of transmitting and receiving in both frequency ranges. For the separation of the transmitted and received signals, therefore, a suitable frequency filtering is required, with which on the one hand the transmission signal from the transmitter to the antenna and on the other hand the received signals are transmitted from the antenna to the receiver. For the distribution of the transmitted and received signals, high-frequency filters are used today.
Aus dem Stand der Technik sind Hochfrequenzfilter in koax¬ ialer Bauweise bekannt. Ein Beispiel eines solchen Koax¬ ialresonators ist in der Vorveröffentlichung "Theory and Design of Microwave Filters", Ian Hunter, Electromagnetic Waves Series 48, Veröffentlichungsjahr 2001, Seite 197 gezeigt. Bei solchen Koaxialresonatoren handelt es sich um schmalbandige Filter mit steilen Flanken. Diese Filter sind üblicherweise metallische Guss- oder Frästeile mit Resonatorhohlräumen, die elektrisch an Metalldrähte ange¬ koppein. Diese herkömmlichen Koaxialresonatoren weisen den Nachteil auf, dass sie in der Herstellung relativ teuer sind und große Abmessungen aufweisen.High-frequency filters in coaxial design are known from the prior art. An example of such a coaxial resonator can be found in the prior art publication "Theory and Design of Microwave Filters, "Ian Hunter, Electromagnetic Waves Series 48, Release 2001, page 197. Such coaxial resonators are narrow-band, steep-flank filters which are typically metallic cast or milled parts with resonator cavities that are electrically connected to metal wires These conventional coaxial resonators have the disadvantage that they are relatively expensive to manufacture and have large dimensions.
Aus dem Stand der Technik sind ferner Streifenleitungs¬ filter bekannt, die deutlich breitbandiger als Filter nach koaxialer Bauweise sind. Ein herkömmlicher Streifenlei¬ tungsfilter ist beispielsweise in der Vorveröffentlichung "Microstrip Filters for RF/Microwave Applications", Jia- Sheng Hong und M. J. Lancaster, Veröffentlichungsjähr 2001, insbesondere in Figur 6.5 auf Seite 170 gezeigt. Dort ist eine elektrische Leitung in Streifenleitungs¬ technik wiedergegeben, wobei in geringem Abstand benach- bart zu dieser Leitung mehrere U-förmige Resonatoren oder gerade, d.h. streifenförmig verlaufende Resonatoren vor¬ gesehen sind. Die gerade verlaufenden Resonatoren bzw. die Schenkel der U-förmig gebildeten Resonatoren verlaufen dabei rechtwinkelig zu der streifenleitungsförmigen Lei- tung. Der Seitenabstand der einzelnen Resonatoren in Rich¬ tung der Streifenleitung beträgt jeweils λ/4. Filter in Streifenleitungstechnik sind wesentlich einfacher her¬ stellbar als Filter nach koaxialer Bauweise, jedoch sind Streifenleitungsfilter wesentlich breitbandiger.Streifenleitungs filter are also known from the prior art, which are significantly broadband as a filter coaxial design. A conventional stripline filter is shown for example in the prior publication "Microstrip Filters for RF / Microwave Applications", Jia-Sheng Hong and M. J. Lancaster, publication year 2001, in particular in Figure 6.5 on page 170. There, an electrical line in Streifenleitungs¬ technology is reproduced, wherein at a small distance adjacent to this line more U-shaped resonators or straight, i. strip-shaped resonators are vor¬ seen. The straight resonators or the limbs of the U-shaped resonators are perpendicular to the strip-line-shaped line. The lateral distance of the individual resonators in the direction of the stripline is in each case λ / 4. Stripline filters are much easier to manufacture than coaxial type filters, but stripline filters are much more broadband.
Aufgabe der Erfindung ist es, ein schmalbandiges Hoch¬ frequenzfilter zu schaffen, welches gegenüber herkömm¬ lichen koaxialen Hochfrequenzfiltern einfacher herstellbar ist und eine kompaktere Bauweise aufweist.The object of the invention is to provide a narrow band high frequency filter which is easier to produce than conventional coaxial high frequency filters is and has a more compact design.
Diese Aufgabe wird durch das Hochfrequenzfilter gemäß dem unabhängigen Anspruch 1 gelöst. Weiterbildungen der Erfin- düng sind in den abhängigen Ansprüchen definiert.This object is achieved by the high frequency filter according to independent claim 1. Further developments of the invention are defined in the dependent claims.
Das erfindungsgemäße Hochfrequenzfilter umfasst ein Sub¬ strat aus dielektrischem Material mit einer ersten Seite und einer gegenüberliegenden zweiten Seite, wobei auf der ersten Seite des Substrats wenigstens ein elektrisch lei¬ tender Streifenleiter aufgebracht ist. Dieser Streifenlei¬ ter ist mit wenigstens einem Resonator elektrisch gekop¬ pelt, wobei der Resonator nicht als Streifenleiter ausge¬ bildet ist, sondern ein Koaxialresonator mit einem Außen- leitertopf und einem koaxial im Außenleitertopf angeordne¬ ten, im Wesentlichen stabförmigen Innenleiter ist. Der Außenleitertopf ist dabei galvanisch mit einer Massefläche verbunden. Der Innenleiter ist an einem ersten Ende galva¬ nisch und/oder kapazitiv -mit dem Topfboden des Außenlei- tertopfs verbunden, wobei eine galvanische Verbindung insbesondere bei der Ausgestaltung des Resonators als λ/4- Resonator verwendet wird und bei der Ausgestaltung des Resonators als λ/2-Resonator vorzugsweise eine kapazitive Kopplung verwendet wird. Über ein entgegengesetztes zwei- tes Ende des Innenleiters ist der Resonator an dem wenigs¬ tens einen Streifenleiter elektrisch angekoppelt. Auf diese Weise wird ein Hochfrequenzfilter geschaffen, der in seinem Frequenzverhalten im Wesentlichen einem Koaxialfil¬ ter nach herkömmlicher Bauweise entspricht, d.h. das FiI- ter weist ein schmales Frequenzband auf. Im Unterschied zu herkömmlichen Koaxialfiltern sind die Resonatorhohlräume jedoch nicht in metallischen Guss- oder Frästeilen ausge¬ bildet, sondern es werden separate Resonatoren bestehend aus Außenleitertopf und Innenleiter verwendet, welche auf einfache Weise mittels der Streifenleitungstechnik an eine elektrische Leitung ankoppeln. Dieser Hochfrequenzfilter ist gegenüber herkömmlichen Koaxialfiltern wesentlich preisgünstiger herstellbar, da die einzelnen Resonatoren separat mit preiswerten Verfahren gefertigt werden können und anschließend mit einem ebenfalls separat gefertigten Streifenleiter auf einem Substrat verkoppelt werden kön¬ nen. Das erfindungsgemäße Hochfrequenzfilter kombiniert somit die Streifenleitungstechnik mit Resonatoren nach koaxialer Bauweise und schafft hierdurch einen Filter, der gegenüber herkömmlichen Koaxialfiltern einfacher herge¬ stellt werden kann und darüber hinaus kompakter aufgebaut ist.The high-frequency filter according to the invention comprises a substrate made of dielectric material having a first side and an opposite second side, wherein at least one electrically conductive strip conductor is applied to the first side of the substrate. This strip conductor is electrically coupled to at least one resonator, wherein the resonator is not designed as a strip conductor, but is a coaxial resonator with an outer conductor pot and a substantially rod-shaped inner conductor arranged coaxially in the outer conductor pot. The outer conductor pot is galvanically connected to a ground plane. The inner conductor is galvanically and / or capacitively connected to the pot bottom of the outer conductor pot at a first end, a galvanic connection being used in particular in the embodiment of the resonator as a λ / 4 resonator and in the embodiment of the resonator as λ / 2 resonator preferably a capacitive coupling is used. The resonator is electrically coupled to the at least one strip conductor via an opposite second end of the inner conductor. In this way, a high-frequency filter is created, which essentially corresponds in terms of its frequency response to a coaxial filter according to the conventional design, ie the filter has a narrow frequency band. In contrast to conventional coaxial filters, however, the resonator cavities are not formed in metallic cast or milled parts, but separate resonators are present used from outer conductor pot and inner conductor, which couple in a simple manner by means of the stripline technology to an electrical line. This high-frequency filter is compared to conventional coaxial filter much cheaper to produce, since the individual resonators can be manufactured separately with inexpensive methods and then coupled with a likewise separately manufactured strip conductor on a substrate NEN NEN. The high-frequency filter according to the invention thus combines the stripline technique with resonators according to the coaxial design, thereby creating a filter which can be manufactured more simply than conventional coaxial filters and, moreover, has a more compact design.
In einer besonders bevorzugten Ausführungsform des erfin¬ dungsgemäßen Filters ist Luft als Dielektrikum zwischen dem Innenleiter und der Seitenwand des Außenleitertopfs angeordnet. Vorzugsweise ist das Filter derart aufgebaut, dass der Resonator auf der zweiten Seite des Substrats, d. h. auf der Seite, die der " Seite mit dem aufgebrachten Streifenleiter gegenüberliegt, angeordnet ist. Die Masse¬ fläche ist insbesondere eine im Wesentlichen durchgehende leitende Schicht auf der zweiten Seite des Substrats, wobei der Rand der dem Topfboden gegenüberliegenden Öff¬ nung des Außenleitertopfs mit der leitenden Schicht galva¬ nisch verbunden ist, insbesondere an dieser angelötet ist, wobei vorzugsweise eine Schwalllötung verwendet wird. Die leitende Schicht weist in einer bevorzugten Ausführungs- form ringförmige Ausnehmungen auf, welche das dielektri¬ sche Material des Substrats freilegen, wobei der Rand der dem Topfboden gegenüberliegenden Öffnung des Außenleiter¬ topfs um die ringförmige Ausnehmung herum angeordnet ist. Das zweite Ende des Innenleiters, mit dem die Kopplung an den Streifenleiter erreicht wird, ist vorzugsweise auf dem Substrat befestigt. Ferner weist das Substrat auf der zweiten Seite vorzugsweise eine Aussparung und/oder ein Loch auf, in welches das zweite Ende des Innenleiters eingesetzt ist und insbesondere dort angelötet ist. Dem¬ gegenüber wird das erste Ende des Innenleiters vorzugs¬ weise in eine Aussparung. und/oder in ein Loch im Boden des Außenleitertopfes des Resonators eingesetzt und insbeson¬ dere dort verlötet und/oder verpresst. Der Außenleitertopf und der Innenleiter können somit separat gefertigt und erst anschließend galvanisch miteinander verbunden werden. In einer besonders bevorzugten Ausführungsform steht fer- ner die Axialrichtung des Resonators im Wesentlichen senk¬ recht auf der ersten und/oder zweiten Seite des Substrats.In a particularly preferred embodiment of the filter according to the invention, air is arranged as a dielectric between the inner conductor and the side wall of the outer conductor pot. Preferably, the filter is constructed such that the resonator on the second side of the substrate, ie, on the side opposite to the "side with the applied strip conductor is arranged. The Masse¬ surface is in particular a substantially continuous conductive layer on the second 1, wherein the edge of the opening of the outer conductor pot opposite the bottom of the pot is galvanically connected to the conductive layer, in particular soldered to the latter, wherein preferably a wave soldering is used, in one preferred embodiment the conductive layer has ring-shaped Recesses, which expose the dielectric material of the substrate, wherein the edge of the opening opposite the pot bottom opening of the Außenleiter¬ pot is arranged around the annular recess around. The second end of the inner conductor, with which the coupling is achieved to the strip conductor, is preferably mounted on the substrate. Furthermore, the substrate on the second side preferably has a recess and / or a hole into which the second end of the inner conductor is inserted and in particular soldered there. In contrast, the first end of the inner conductor is preferably inserted into a recess. and / or inserted into a hole in the bottom of the outer conductor pot of the resonator and in particular soldered there and / or pressed. The outer conductor pot and the inner conductor can thus be manufactured separately and only then galvanically connected to each other. In a particularly preferred embodiment, furthermore, the axial direction of the resonator is substantially perpendicular to the first and / or second side of the substrate.
Der Außenleitertopf und/oder der Innenleiter können auf einfache Weise gefertigt werden. -Beispielsweise kann es sich bei diesen Bauteilen um gedrehte Metallteile handeln, oder die Bauteile sind Kunststoffteile, die auf der Außen- und/oder Innenfläche metallisiert sind. Vorzugsweise ist der Resonator kapazitiv und/oder induktiv an dem wenigs¬ tens einen Streifenleiter angekoppelt, wobei der Streifen- leiter beispielsweise eine mäanderförmige Struktur auf¬ weisen kann. Insbesondere kann der Streifenleiter Ver¬ zweigungen umfassen, die einen Kreis und/oder Halbkreis und/oder einen Kreisabschnitt bilden, wobei jeweils in der Mitte das zweite Ende des Innenleiters angeordnet ist.The outer conductor pot and / or the inner conductor can be manufactured in a simple manner. For example, these components may be turned metal parts, or the components may be plastic parts metallized on the outside and / or inside surface. Preferably, the resonator is capacitively and / or inductively coupled to the at least one strip conductor, wherein the strip conductor may, for example, have a meandering structure. In particular, the strip conductor can include branches which form a circle and / or semicircle and / or a circular section, the second end of the inner conductor being arranged in each case in the middle.
In einer weiteren Ausführungsform der Erfindung ist auf der ersten Seite des Substrats eine Abdeckung vorgesehen, wobei die Abdeckung vorzugsweise wenigstens ein im Wesent- liehen axial mit einem Koaxialresonator ausgerichtetes Ab¬ stimmelement zur Veränderung der elektrischen Eigenschaf¬ ten des Hochfrequenzfilters aufweist. Das Abstimmelement kann beispielsweise ein in der Abdeckung verschiebbarer metallischer Stift und/oder eine in der Abdeckung verdreh¬ bare metallische Schraube sein.In a further embodiment of the invention, a cover is provided on the first side of the substrate, wherein the cover preferably at least one substantially has axially aligned with a coaxial resonator Ab¬ tuning element for changing the electrical properties of the high-frequency filter. The tuning element may be, for example, a metallic pin which can be displaced in the cover and / or a metallic screw which can be rotated in the cover.
In einer besonders bevorzugten Ausführungsform sind mehre¬ re Resonatoren in Längsrichtung neben dem Streifenleiter angeordnet, wobei die Resonatoren unterschiedliche Größen aufweisen können. Das Substrat ist vorzugsweise eine di¬ elektrische Platte. Die Resonatoren sind insbesondere derart- an dem Streifenleiter gekoppelt, dass ein Bandpass¬ filter und/oder ein Bandsperrfilter gebildet ist. Vorzugs- weise arbeitet das Hochfrequenzfilter im Bereich der 1800 MHz-Mobilfunkfrequenz und/oder der 2000 MHz-Mobilfunk¬ frequenz.In a particularly preferred embodiment, several resonators are arranged in the longitudinal direction next to the strip conductor, wherein the resonators may have different sizes. The substrate is preferably a dielectric plate. The resonators are in particular coupled to the strip conductor in such a way that a bandpass filter and / or a bandstop filter is formed. The high-frequency filter preferably operates in the range of the 1800 MHz mobile radio frequency and / or the 2000 MHz mobile radio frequency.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand der beigefügten Figuren detailliert beschrieben.Embodiments of the invention are described below in detail with reference to the accompanying drawings.
Es zeigen:Show it:
Figur 1 : eine perspektivische, teilweise geschnit- tene Ansicht von oben auf eine Aus¬ führungsform des erfindungsgemäßen Hoch¬ frequenzfilters;FIG. 1 shows a perspective, partially cutaway top view of an embodiment of the high-frequency filter according to the invention;
Figur 2 : eine perspektivische, teilweise geschnit- tene Ansicht von unten auf das Hochfre¬ quenzfilter der Figur 1; und Figur 3 : eine Draufsicht auf eine Ausführungsform eines im erfindungsgemäßen Filter verwen¬ deten Streifenleiters.FIG. 2 shows a perspective, partially cut-away view from below of the high-frequency filter of FIG. 1; and FIG. 3 shows a plan view of an embodiment of a strip conductor used in the filter according to the invention.
Das in Figur 1 gezeigte Hochfrequenzfilter umfasst eine dielektrische Substratplatte 1, auf deren Oberseite drei identische Koaxialresonatoren 2 angeordnet sind. Es können ggf. auch weniger oder mehr Resonatoren auf der Oberseite angeordnet sein, wobei im Falle von mehr als drei Resona- toren die Figur 1 nur einen Teilausschnitt des Filters zeigt und sich die Substratplatte mit weiteren Resonatoren in Längsrichtung fortsetzt. Der vorderste Koaxialresonator ist in Schnittansicht dargestellt. Jeder Koaxialresonator umfasst einen zylindrischen, topfförmigen Außenleiter 3, bei dem es sich beispielsweise um ein gedrehtes Metallteil handelt. Alternativ kann der Außenleiter ein Spritzguss¬ teil sein, dessen Außen- und/oder Innenfläche geschlossen metallisiert ist. Der Außenleitertopf 3 ist mit seiner Topföffnung nach unten auf die Oberseite Ia- des Substrats aufgesetzt, so dass der Topfboden 3a von der Oberseite Ia beabstandet ist. In Axialrichtung des Außenleitertopfes ist konzentrisch in seiner Mitte ein zylindrischer Innen- leiterstab 4 angeordnet, welcher an seinem oberen Ende 4a in ein entsprechendes Loch im Topfboden 3a eingesetzt und dort angelötet oder verpresst ist. Zwischen Innenleiters- tab und der zylindrischen Seitenwand des Außenleitertopfs ist Luft als Dielektrikum vorgesehen. Das entgegengesetzte untere Ende 4b des zylindrischen Innenleiterstabs 4 ist in eine entsprechende Öffnung Ic im Substrat 1 eingesetzt. Die Oberseite Ia des dielektrischen Substrats 1 ist im Wesentlichen durchgehend metallisiert und bildet eine Massefläche Ia' des Filters, wobei jedoch im Bereich der kreisförmigen TopfÖffnungen der Außenleitertöpfe 3 ring- förmige Ausnehmungen Ib vorgesehen sind, welche das di¬ elektrische Material des Substrats 1 freilegen. Der äußere Rand jeder Ausnehmung Ib schließt jeweils mit einem Rand der Topföffnung eines Außenleitertopfes ab, wobei der Rand der Topföffnung an der Außenseite der Außenleitertopfes galvanisch mit der metallisierten Schicht auf dem Sub¬ strat, beispielsweise mittels Schwalllötung, verbunden ist. Auf diese Weise wird der Massekontakt des Außenlei¬ tertopfes hergestellt. An die Innenseite der ringförmigen Ausnehmnung Ib schließt sich ein kreisförmiger metalli¬ sierter Abschnitt Id an, in dessen Mitte sich die Öffnung Ic befindet. Auf der Unterseite Ie des Substrats 1 befin- det sich eine Schutzabdeckung 5. Die Unterseite Ie wird dabei teilweise nachfolgend auch als erste Seite Ie und die Oberseite Ia teilweise auch als zweite Seite Ia be¬ zeichnet.The high-frequency filter shown in FIG. 1 comprises a dielectric substrate plate 1, on the upper side of which three identical coaxial resonators 2 are arranged. If appropriate, fewer or more resonators may also be arranged on the upper side, wherein in the case of more than three resonators, FIG. 1 shows only a partial section of the filter and the substrate plate continues with further resonators in the longitudinal direction. The foremost coaxial resonator is shown in sectional view. Each coaxial resonator comprises a cylindrical, cup-shaped outer conductor 3, which is, for example, a turned metal part. Alternatively, the outer conductor may be an injection-molded part whose outer and / or inner surface is metallized closed. The outer conductor pot 3 is placed with its pot opening down on the upper side 1a of the substrate, so that the pot bottom 3a is spaced from the upper side 1a. In the axial direction of the outer conductor pot, a cylindrical inner conductor rod 4 is concentrically arranged in its center, which is inserted at its upper end 4a into a corresponding hole in the pot bottom 3a and soldered or pressed there. Between Innenleiters- tab and the cylindrical side wall of the outer conductor pot air is provided as a dielectric. The opposite lower end 4b of the cylindrical inner conductor bar 4 is inserted into a corresponding opening Ic in the substrate 1. The upper side 1a of the dielectric substrate 1 is metallized substantially continuously and forms a ground surface 1a 'of the filter, but in the region of the circular pot openings of the outer conductor pots 3 ring-shaped. shaped recesses Ib are provided, which expose the di¬ electrical material of the substrate 1. The outer edge of each recess Ib terminates in each case with an edge of the pot opening of an outer conductor pot, wherein the edge of the pot opening on the outside of the outer conductor pot is galvanically connected to the metallized layer on the substrate, for example by means of wave soldering. In this way, the ground contact of the Außenlei¬ terpot is made. The interior of the annular recess Ib is adjoined by a circular metallized section Id, in the center of which is the opening Ic. On the lower side Ie of the substrate 1 there is a protective cover 5. The lower side Ie is partially subsequently also referred to as the first side Ie and the upper side Ia partly as the second side Ia.
Figur 2 zeigt eine perspektivische, teilweise geschnittene Ansicht des Filters der Figur 1 von unten. Das Gehäuse 5 ist hierbei im Schnitt gezeigt, so dass die Struktur der Unterseite Ie des Substrats 1 ersichtlich wird. Auf der Unterseite befindet sich ein Streifenleiter 6, der sich im Wesentlichen in Längsrichtung der Substratplatte er¬ streckt. Der Streifenleiter umfasst gerade Abschnitte 6a sowie kreisförmige Verzweigungen 6b, in deren Mitte sich jeweils die Öffnung Ic befindet, in der ein Ende 4b des Innenleiterstabs 4 eingesetzt ist. Die Öffnung Ic ist hierbei auf der Seite Ie metallisiert, wobei das Metall jedoch keine Verbindung zu den kreisförmigen Verzweigungen 6b aufweist. Der Innenleiterstab wird auf der Unterseite Ie an der Öffnung Ic angelötet. Durch den in die Öffnung Ic eingesetzten Innenleiter wird somit eine kapazitive Kopplung des Koaxialresonators 2 zu dem Streifenleiter 6 hergestellt.Figure 2 shows a perspective, partially sectioned view of the filter of Figure 1 from below. The housing 5 is here shown in section, so that the structure of the bottom Ie of the substrate 1 is visible. On the underside there is a strip conductor 6, which extends substantially in the longitudinal direction of the substrate plate. The strip conductor comprises straight sections 6a and circular branches 6b, in the center of which is in each case the opening Ic in which one end 4b of the inner conductor bar 4 is inserted. The opening Ic is metallized on the side Ie, but the metal has no connection to the circular branches 6b. The inner conductor bar is soldered to the bottom Ie at the opening Ic. As a result of the inner conductor inserted into the opening Ic, a capacitive coupling of the coaxial resonator 2 to the strip conductor 6 is achieved produced.
Die Abdeckung 5 umläuft den Rand der Unterseite ' Ie des Substrats 1, so dass die gesamte Unterseite von der Abde¬ ckung umschlossen wird. In der Abdeckung ist ferner ein Loch 5a vorgesehen, welches mit einem darunter liegenden Resonator 2 in Axialrichtung ausgerichtet ist. In dieses Loch kann ein Abstimmelement eingesetzt werden, welches beispielsweise ein senkrecht zur Substratplatte 1 ver¬ schiebbarer metallischer Bolzen sein kann. Der Abstand dieses Bolzens zur Unterseite Ie der Substratplatte 1 kann mit dem Abstimmelement verändert werden, wodurch das Fre¬ quenzverhalten des Filters beeinflusst werden kann. Es können dabei mehr Abstimmelemente vorgesehen sein, wobei jedes Abstimmelement mit einem darunter liegenden Resona- tor in Axialrichtung ausgerichtet ist. Das Filter gemäß Figuren 1 und 2 wird beispielsweise als Bandsperrfilter zur Trennung der 1800 MHz-Mobilfunkfreguenz von der UMTS- Mobilfunkfrequenz im 2000 MHz-Bereich eingesetzt. Das Filter ist hierbei gegenüber herkömmlichen Streifenlei¬ tungsfiltern schmalbandiger und weist steilere Flanken auf. In seinem Frequenzverhalten entspricht das Filter somit herkömmlichen Koaxialfiltern in der Form von metal- lischen Fräs- bzw. Gussteilen.The cover 5 runs around the edge of the bottom ' Ie of the substrate 1, so that the entire underside is enclosed by the Abde¬ ckung. In the cover, a hole 5a is further provided, which is aligned with an underlying resonator 2 in the axial direction. In this hole, a tuning element can be used, which may be, for example, a ver¬ perpendicular to the substrate plate 1 slidable metallic bolt. The distance of this bolt to the bottom side Ie of the substrate plate 1 can be changed with the tuning element, whereby the Fre¬ quenzverhalten the filter can be influenced. In this case, more tuning elements can be provided, each tuning element being aligned with an underlying resonator in the axial direction. The filter according to FIGS. 1 and 2 is used, for example, as a band rejection filter for separating the 1800 MHz mobile frequency from the UMTS mobile frequency in the 2000 MHz range. The filter is narrowband compared to conventional stripline filters and has steeper flanks. In terms of its frequency response, the filter thus corresponds to conventional coaxial filters in the form of metallic milling or cast parts.
Die in Figur 1 und 2 gezeigten Resonatoren 3 sind λ/4- Resonatoren, bei denen die Länge des Innenleiterstabs 4 einem Viertel der Wellenlänge λ entspricht. Bei diesen Resonatoren wird der Innenleiterstab 4 an seinem Ende 4a galvanisch mit dem Topfboden 3a verbunden. Es ist jedoch auch möglich, die Resonatoren 3 als λ/2-Resonatoren zu verwenden, bei denen die Länge des Innenleiterstabs 4 die Hälfte der Wellenlänge λ beträgt. In diesem Fall wird das Ende 4a des Innenleiterstabs mit dem Topfboden kapazitiv gekoppelt, beispielsweise indem das Ende 4a mit einer metallischen Scheibe verbunden wird, deren Größe im We- sentlichen der Größe des Topfbodens 3a entspricht und die von dem Topfboden beabstandet ist. Die kapazitive Kopplung wirkt bei der Resonanzfrequenz als Kurzschluss.The resonators 3 shown in FIGS. 1 and 2 are λ / 4 resonators in which the length of the inner conductor bar 4 corresponds to one quarter of the wavelength λ. In these resonators, the inner conductor bar 4 is galvanically connected at its end 4a to the bottom of the pot 3a. However, it is also possible to use the resonators 3 as λ / 2 resonators, in which the length of the inner conductor bar 4 the Half the wavelength λ. In this case, the end 4a of the inner conductor bar is capacitively coupled to the pot bottom, for example, by the end 4a is connected to a metallic disc whose size corresponds substantially to the size of the pot bottom 3a and which is spaced from the bottom of the pot. The capacitive coupling acts as a short circuit at the resonant frequency.
Der in Figur 2 gezeigte Streifenleiter 6 stellt lediglich eine mögliche Ausführungsform dar. Insbesondere ist es auch möglich, dass der Streifenleiter mäanderförmig ausge¬ bildet ist und die kreisförmigen Verzweigungen 6b versetzt zu den geraden Abschnitten 6a angeordnet sind. Ferner müssen die Verzweigungen keinen geschlossenen Kreis bil- den, sondern sie können auch nur Kreisabschnitte umfassen. Figur 3 zeigt eine Draufsicht auf die Unterseite Ie einer Substratplatte mit einer solchen alternativen Ausgestal¬ tung des Streifenleiters. Man erkennt, dass Verzweigungen in der Form von geschlossenen Kreisen 6b sowie Verzweigun- gen in der Form von Kreisabschnitten 6c vorgesehen sind, wobei die Verzweigungen jeweils über Stege 6d mit geraden Abschnitten 6a eines mäanderförmigen Streifenleiters 6 verbunden sind. Konzentrisch zu den Verzweigungen 6b bzw. 6c ist jeweils die Öffnung Ic angeordnet, in die das Ende 4b des Innenleiterstabs 4 eingesetzt wird.The stripline 6 shown in FIG. 2 represents only one possible embodiment. In particular, it is also possible for the stripline to be of meander-shaped configuration and for the circular branches 6b to be offset relative to the straight sections 6a. Furthermore, the branches do not have to form a closed circle, but they can also comprise only sections of a circle. FIG. 3 shows a plan view of the underside Ie of a substrate plate with such an alternative embodiment of the strip conductor. It can be seen that branches in the form of closed circles 6b and branches in the form of circular sections 6c are provided, wherein the branches are respectively connected via webs 6d to straight sections 6a of a meander-shaped strip conductor 6. Concentric to the branches 6b and 6c, respectively, the opening Ic is arranged, in which the end 4b of the inner conductor bar 4 is inserted.
Aus den beschriebenen Ausführungsbeispielen ist also er¬ sichtlich, dass der elektrisch leitfähige Außenleitertopf 3 an seinem zum Topfboden 3a entfernt liegende Bereich, insbesondere an seinem offenen oberen Randbereich gegen¬ überliegend zum Topfboden 3a mit der Massefläche Ia, vor¬ zugsweise am gesamten umlaufenden Rand elektrisch verbun¬ den ist. Koaxial dazu ist der Innenleiter 4 angeordnet, der am Topfboden 3a galvanisch oder kapazitiv mit dem Topfboden verbunden ist. Die elektrische Verbindung mit dem Streifenleiter 6 erfolgt über den Innenleiter 4, d.h. im gezeigten Ausführungsbeispiel nur und ausschließlich über den Innenleiter 4. Dazu ist der Innenleiter 4 ent¬ fernt zu seinem einen Ende, an dem er galvanisch oder kapazitiv mit dem Topfboden 3a elektrisch verbunden ist mit dem Streifenleiter verbunden. Vorzugsweise ist diese zweite Verbindung an dem zum Topfboden gegenüberliegenden Ende des Innenleiters 4 mit dem Streifenleiter 6 ebenfalls galvanisch oder kapazitiv. It is therefore apparent from the exemplary embodiments described that the electrically conductive outer conductor pot 3 is electrically conductive at its region remote from the pot bottom 3a, in particular at its open upper edge region opposite the pot bottom 3a with the ground surface 1a, preferably at the entire circumferential edge verbun is the. Coaxially with the inner conductor 4 is arranged, which is electrically or capacitively connected to the bottom of the pot 3a. The electrical connection to the strip conductor 6 takes place via the inner conductor 4, ie in the embodiment shown only and exclusively via the inner conductor 4. For this purpose, the inner conductor 4 ent removed to one end to which it is electrically or capacitively electrically connected to the pot bottom 3a is connected to the stripline. Preferably, this second connection is likewise galvanic or capacitive at the end of the inner conductor 4 opposite the pot bottom with the strip conductor 6.

Claims

347 P 1 PCTPatentansprüche: 347 P 1 PCTPatentansprüche:
1. Hochfrequenzfilter, mit den folgenden Merkmalen: es ist ein Substrat (1) aus dielektrischem Material mit einer ersten Seite (Ie) und einer gegenüberliegenden zweiten Seite (Ia) vorgesehen; auf der ersten Seite (Ie) des Substrats (1) ist wenigs¬ tens ein Streifenleiter (6) aufgebracht; es ist wenigstens ein Resonator (2) vorgesehen, der an - dem wenigstens einen Streifenleiter (6) elektrisch angekoppelt ist; es ist eine von dem Streifenleiter (6) beabstandete Massefläche (Ia1) vorgesehen; der wenigstens eine Resonator (2) ist ein Koaxialreso- nator mit einem Außenleitertopf (3) und einem koaxial im Außenleitertopf angeordneten, im Wesentlichen stab- förmigen Innenleiter (4); der Außenleitertopf (3) ist galvanisch mit der Masse¬ fläche (Ia1) verbunden; - der Innenleiter (4) ist an einem ersten Ende (4a) gal¬ vanisch und/oder kapazitiv mit dem Topfboden (3a) des Außenleitertopfes (3) verbunden; gekennzeichnet durch folgende weitere Merkmale: ein zum ersten Ende (4a) entgegengesetztes zweites Ende (4b) des Innenleiters (4) ist an dem wenigstens einen Streifenleiter (6) elektrisch angekoppelt, und der Streifenleiter (6) ist über den Innenleiter (4) mit dem Außenleitertopf (3) elektrisch verbunden.A high frequency filter, comprising: a substrate (1) of dielectric material having a first side (Ie) and an opposite second side (Ia); On the first side (Ie) of the substrate (1), at least one strip conductor (6) is applied; at least one resonator (2) is provided, which is electrically coupled to the at least one strip conductor (6); a ground plane (Ia 1 ) spaced from the strip conductor (6) is provided; the at least one resonator (2) is a coaxial resonator with an outer conductor pot (3) and a substantially rod-shaped inner conductor (4) arranged coaxially in the outer conductor pot; the outer conductor pot (3) is galvanically connected to the ground surface (Ia 1 ); - The inner conductor (4) is gal¬ vanisch and / or capacitively connected to the pot bottom (3a) of the outer conductor pot (3) at a first end (4a); characterized by the following further features: a second end opposite the first end (4a) (4b) of the inner conductor (4) is electrically coupled to the at least one strip conductor (6), and the strip conductor (6) is electrically connected to the outer conductor pot (3) via the inner conductor (4).
2. Hochfrequenzfilter nach Anspruch 1, dadurch gekenn¬ zeichnet, dass Luft als Dielektrikum zwischen dem Innen¬ leiter (4) und der Seitenwand des Außenleitertopfs (3) vorgesehen ist.2. High-frequency filter according to claim 1, characterized gekenn¬ characterized in that air is provided as a dielectric between the Innen¬ conductor (4) and the side wall of the outer conductor pot (3).
3. Hochfrequenzfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der wenigstens eine Resonator auf der zweiten Seite (Ia) des Substrats (1) angeordnet ist.3. High-frequency filter according to claim 1 or 2, characterized in that the at least one resonator on the second side (Ia) of the substrate (1) is arranged.
4. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass die Masseflache (Ia1) eine im Wesentlichen durchgehende leitende Schicht auf der zweiten Seite des Substrats (1) ist und der Rand der "dem Topfboden (3a) gegenüberliegenden Öffnung des Außenleitertopfs (3) mit der Massefläche (Ia') galvanisch verbunden ist.4. High-frequency filter according to one of the preceding An¬ claims, characterized in that the ground plane (Ia 1 ) is a substantially continuous conductive layer on the second side of the substrate (1) and the edge of the " bottom of the pot (3a) opposite opening of the Outer conductor pot (3) with the ground surface (Ia ') is galvanically connected.
5. Hochfrequenzfilter nach Anspruch 4, dadurch gekenn¬ zeichnet, dass der Rand der dem Topfboden (3a) gegenüber- liegenden Öffnung des Außenleitertopfs (3) an der leiten¬ den Massefläche (Ia1) angelötet ist, insbesondere mittels Schwalllötung.5. High-frequency filter according to claim 4, characterized gekenn¬ characterized in that the edge of the pot bottom (3a) opposite the opening of the outer conductor pot (3) is soldered to the leit¬ the ground surface (Ia 1 ), in particular by means of wave soldering.
6. Hochfrequenzfilter nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die leitende Masseflache (Ia') wenigs¬ tens eine ringförmige Ausnehmung (Ib) aufweist, welche das dielektrische Material des Substrats (1) freilegt, wobei der Rand der dem Topfboden (3a) gegenüberliegenden Öffnung des Außenleitertopfs (3) um die ringförmige Ausnehmung (Ib) herum angeordnet ist.6. High-frequency filter according to claim 4 or 5, characterized in that the conductive ground plane (Ia ') wenigs¬ least an annular recess (Ib), which exposes the dielectric material of the substrate (1), wherein the edge of the pot bottom (3a ) opposite opening of the outer conductor pot (3) is arranged around the annular recess (Ib).
7. Hochfrequenzfilter nach einem der vorhergehenden An- Sprüche, dadurch gekennzeichnet, dass das zweite Ende (4b) des Innenleiters (4) auf dem Substrat (1) befestigt ist.7. High-frequency filter according to one of the preceding arrival claims, characterized in that the second end (4b) of the inner conductor (4) on the substrate (1) is fixed.
8. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass das Substrat (1) auf der zweiten Seite (Ia) eine Aussparung und/oder ein sich zu der ersten Seite (Ie) erstreckendes Loch (Ic) aufweist, in welches das zweite Ende (4b) des Innenleiters (4) ein¬ gesetzt ist und vorzugsweise dort angelötet ist.8. High-frequency filter according to one of the preceding An¬ claims, characterized in that the substrate (1) on the second side (Ia) has a recess and / or to the first side (Ie) extending hole (Ic), in which the second end (4b) of the inner conductor (4) is set ein¬ and is preferably soldered there.
9. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass das erste Ende (4a) des Innenleiters (4) in eine Aussparung und/oder ein Loch im Topfboden (3a) des Außenleitertopfes (3) eingesetzt ist und vorzugsweise an dem Loch mit dem Topfboden verlötet und/oder verpresst ist.9. High-frequency filter according to one of the preceding An¬ claims, characterized in that the first end (4a) of the inner conductor (4) in a recess and / or a hole in the pot bottom (3a) of the outer conductor pot (3) is inserted and preferably on the Hole is soldered to the bottom of the pot and / or pressed.
10. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass die Axialrichtung des Resonators (2) im Wesentlichen senkrecht auf der ers- ten und/oder zweiten Seite (Ie, Ia) des Substrats (1) steht.10. High-frequency filter according to one of the preceding An¬ claims, characterized in that the axial direction of the resonator (2) is substantially perpendicular to the first and / or second side (Ie, Ia) of the substrate (1).
11. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass der Außenleitertopf (3) und/oder der Innenleiter (4) ein gedrehtes Metallteil ist.11. High-frequency filter according to one of the preceding An¬ claims, characterized in that the outer conductor pot (3) and / or the inner conductor (4) is a rotated metal part.
12. Hochfrequenzfilter nach einem der vorhergehenden An- Sprüche, dadurch gekennzeichnet, dass der Außenleitertopf (3) und/oder der Innenleiter (4) ein Kunststoffteil ist, das auf der Außen- und/oder Innenfläche metallisiert ist.12. High-frequency filter according to one of the preceding Proverbs, characterized in that the outer conductor pot (3) and / or the inner conductor (4) is a plastic part, which is metallized on the outer and / or inner surface.
13. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass der wenigstens eine Resonator (2) kapazitiv und/oder induktiv an dem wenigs¬ tens einen Streifenleiter (6) angekoppelt ist.13. High-frequency filter according to one of the preceding An¬ claims, characterized in that the at least one resonator (2) is capacitively and / or inductively coupled to the wenigs¬ least one strip conductor (6).
14. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass der Streifenleiter (6) zumindest teilweise eine mäanderförmige Struktur auf¬ weist.14. High-frequency filter according to one of the preceding An¬ claims, characterized in that the strip conductor (6) at least partially has a meandering structure auf¬.
15. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass der Streifenleiter (6) eine oder mehrere Verzweigungen aufweist, welche einen Kreis und/oder einen Kreisabschnitt (6c) bilden, wobei in der Mitte des Kreises und/oder des Kreisabschnittes das zweite Ende (4b) des Innenleiters (4) angeordnet ist.15. High-frequency filter according to one of the preceding An¬ claims, characterized in that the strip conductor (6) has one or more branches, which form a circle and / or a circle section (6c), wherein in the center of the circle and / or the circle section the second end (4b) of the inner conductor (4) is arranged.
16. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass eine Abdeckung (5) auf der ersten Seite (Ie) des Substrats (1) vorgesehen ist.16. High-frequency filter according to one of the preceding An¬ claims, characterized in that a cover (5) on the first side (Ie) of the substrate (1) is provided.
17. Hochfrequenzfilter nach Anspruch 16, dadurch gekenn¬ zeichnet, dass in der Abdeckung (5) wenigstens ein im Wesentlichen axial mit einem Resonator (2) ausgerichtetes Abstimmelement zur Veränderung der elektrischen Eigen¬ schaft des Hochfrequenzfilters vorgesehen ist.17. High-frequency filter according to claim 16, characterized gekenn¬ characterized in that in the cover (5) is provided at least one substantially axially with a resonator (2) aligned tuning element for changing the electrical property of the high-frequency Hoch¬.
18. Hochfrequenzfilter nach Anspruch 17, dadurch gekenn- zeichnet, dass das wenigstens eine Abstimmelement ein in der Abdeckung (5) verschiebbarer metallischer Stift und/oder eine in der Abdeckung (5) verdrehbare metallische Schraube ist.18. High-frequency filter according to claim 17, characterized characterized in that the at least one tuning element is a metallic pin displaceable in the cover (5) and / or a metallic screw which can be rotated in the cover (5).
19. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass mehrere Resonatoren (2) in Längsrichtung neben dem Streifenleiter (6) angeord¬ net sind.19. High-frequency filter according to one of the preceding An¬ claims, characterized in that a plurality of resonators (2) in the longitudinal direction next to the strip conductor (6) are angeord¬ net.
20. Hochfrequenzfilter nach Anspruch 19, dadurch gekenn¬ zeichnet, dass die Resonatoren (2) unterschiedliche Größen aufweisen.20. High-frequency filter according to claim 19, characterized gekenn¬ characterized in that the resonators (2) have different sizes.
21. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass das Substrat (1) eine dielektrische Platte ist.21. High-frequency filter according to one of the preceding An¬ claims, characterized in that the substrate (1) is a dielectric plate.
22. Hochfrequenzfilter nach einem der vorhergehenden An- sprüche, dadurch gekennzeichnet, dass der wenigstens eine Resonator (2) derart an dem Streifenleiter (6) angekoppelt ist, dass ein Bandpassfilter und/oder ein Bandsperrfilter gebildet wird.22. High-frequency filter according to one of the preceding claims, characterized in that the at least one resonator (2) is coupled to the strip conductor (6) such that a band-pass filter and / or a band-stop filter is formed.
23. Hochfrequenzfilter nach einem der vorhergehenden An¬ sprüche, dadurch gekennzeichnet, dass das Filter im Be¬ reich der 1800 MHz-Mobilfunkfrequenz und/oder der 2000 MHz-Mobilfunkfrequenz arbeitet. 23. High-frequency filter according to one of the preceding claims, characterized in that the filter operates in the range of the 1800 MHz mobile radio frequency and / or the 2000 MHz mobile radio frequency.
EP05786313A 2004-09-16 2005-09-15 High-frequency filter Not-in-force EP1776733B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045006A DE102004045006B4 (en) 2004-09-16 2004-09-16 High frequency filter
PCT/EP2005/009939 WO2006029868A1 (en) 2004-09-16 2005-09-15 High-frequency filter

Publications (2)

Publication Number Publication Date
EP1776733A1 true EP1776733A1 (en) 2007-04-25
EP1776733B1 EP1776733B1 (en) 2008-11-12

Family

ID=35266888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05786313A Not-in-force EP1776733B1 (en) 2004-09-16 2005-09-15 High-frequency filter

Country Status (6)

Country Link
US (1) US20080024249A1 (en)
EP (1) EP1776733B1 (en)
CN (1) CN100578855C (en)
AT (1) ATE414338T1 (en)
DE (2) DE102004045006B4 (en)
WO (1) WO2006029868A1 (en)

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Also Published As

Publication number Publication date
US20080024249A1 (en) 2008-01-31
EP1776733B1 (en) 2008-11-12
DE102004045006B4 (en) 2006-09-28
DE102004045006A1 (en) 2006-03-30
CN101053114A (en) 2007-10-10
ATE414338T1 (en) 2008-11-15
DE502005005968D1 (en) 2008-12-24
WO2006029868A1 (en) 2006-03-23
CN100578855C (en) 2010-01-06

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