EP1812987B1 - Base body for a yig filter comprising eddy current suppression - Google Patents

Base body for a yig filter comprising eddy current suppression Download PDF

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Publication number
EP1812987B1
EP1812987B1 EP05803477A EP05803477A EP1812987B1 EP 1812987 B1 EP1812987 B1 EP 1812987B1 EP 05803477 A EP05803477 A EP 05803477A EP 05803477 A EP05803477 A EP 05803477A EP 1812987 B1 EP1812987 B1 EP 1812987B1
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EP
European Patent Office
Prior art keywords
base element
yig
slots
filter chambers
recesses
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Application number
EP05803477A
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German (de)
French (fr)
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EP1812987A1 (en
Inventor
Michael Dr. Aigle
Claus Tremmel
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Rohde and Schwarz GmbH and Co KG
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Rohde and Schwarz GmbH and Co KG
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Publication of EP1812987A1 publication Critical patent/EP1812987A1/en
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    • 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
    • H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material
    • H01P1/218—Frequency-selective devices, e.g. filters using ferromagnetic material the ferromagnetic material acting as a frequency selective coupling element, e.g. YIG-filters

Definitions

  • the invention relates to a base body for a YIG band-pass filter, wherein the base body is thoroughlybilter from a non-magnetic metal and interconnected filter chambers are formed in the base body, wherein arranged in the filter chambers YIG elements, as known from EP-A2-0285326 ,
  • YIG band-pass filter have at least a YIG element, which is preferably spherical and is formed of an yttrium-iron garnet (Y ttrium- I RON G arnet YIG) was prepared.
  • the resonator effect is mediated by means of coupling lines.
  • a disadvantage of the YIG bandpass filter known from the above-mentioned publication is, in particular, that in the one-piece main body of the YIG bandpass filter by the e.g. For spectrum analyzers required fast detuning of the frequency-determining magnetic field eddy currents are induced, which limit the tuning speed.
  • the object is achieved in that formed in the body in the recesses and / or radial slots for the suppression of eddy current, at least one inner, not associated with filter chambers recess is disposed entirely between the filter chambers.
  • the Fig. 1 shows a schematic plan view of an embodiment of a YIG bandpass filter 1, which has a base body 2 and in the embodiment, four in the base body 2 formed filter chambers 3 with as many YIG elements 10.
  • the filter chambers 3 are connected to each other by slots 4, in which the sake of clarity not shown coupling lines are inserted, which mediate the Resonator Brady between the resonators 10.
  • the number of filter chambers 3 is not limited to four, but may be less or more.
  • the YIG bandpass filter 1 comprises further components, which are independent of the measures according to the invention and are therefore only shown in an overview.
  • Depending on an input and Auskoppelungs réelle 5 are in the embodiment arranged opposite one another in the base body 2.
  • Actuators 6 for the YIG elements 10 which allow correct positioning of the four YIG elements 10 in the exemplary embodiment relative to the coupling lines, are present in a corresponding number.
  • the YIG elements 10 are mounted on holders 11, which are adjustable by the adjusting devices 6 in their position relative to the coupling lines, not shown.
  • the filter effect of a YIG bandpass filter 1 is based on the coupling of the resonators 10, which allow resonance at an energy transfer from the coupling to the decoupling, but prevent it outside the resonance.
  • the operating frequency of the YIG bandpass filter 1 is essentially determined by the strength of the applied magnetic field.
  • the YIG elements 10 are located in the base body 2 in an air gap of an electromagnet.
  • the base body 2 is preferably made of a solid non-magnetic metal. This has the advantage of a simple mechanical workability, but, as already mentioned above, the disadvantage of the inducibility of eddy currents.
  • the metallic base body 2 serves to decouple the individual YIG filter stages by conducting surfaces which are as closed as possible.
  • the eddy currents produce a magnetic field opposing the original magnetic field and thereby limit the tuning speed.
  • eddy currents in the area of the filter chambers 3 are particularly important because they directly disturb the frequency-determining field at the location of the YIG elements 10.
  • the outer recesses 7 are arranged radially outside the filter chambers 3.
  • the slots 8 extend radially outward between the filter chambers 3.
  • the recesses 7 have a round, rounded or slot-shaped cross-section.
  • the outer recesses 7 and the associated slots 8 are formed in the base body 2, that an interruption of the eddy currents, in particular in the vicinity of the YIG elements 10 is possible.
  • the outer recesses 7 and the slots 8 intersect in an inner region.
  • a further inner recess 9, which is formed cross-shaped in the embodiment, is provided to reduce the eddy currents in the radially inner region of the base body 2.
  • the outer recesses 7 and the inner recess 9 and the slots 8 are introduced in full axial extent of the base body 2 in this, in order to allow a good suppression of the eddy current.

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Description

Die Erfindung betrifft einen Grundkörper für einen YIG-Bandpaßfilter, wobei der Grundkörper aus einem nichtmagnetischen Metall ausgebiltet ist und miteinander verbundene Filterkammern in dem Grundkörper ausgebildet sind, wobei in den Filterkammern YIG-Elemente angeordnet sind, wie bekannt aus EP-A2-0285326 .The invention relates to a base body for a YIG band-pass filter, wherein the base body is ausgebilter from a non-magnetic metal and interconnected filter chambers are formed in the base body, wherein arranged in the filter chambers YIG elements, as known from EP-A2-0285326 ,

YIG-Bandpaßfilter verfügen über zumindest ein YIG-Element, welches vorzugsweise kugelförmig ausgebildet und aus einem Yttrium-Eisen-Granat (Yttrium-Iron-Garnet YIG) hergestellt ist. Die Resonatorwirkung wird mittels Kopplungsleitungen vermittelt.YIG band-pass filter have at least a YIG element, which is preferably spherical and is formed of an yttrium-iron garnet (Y ttrium- I RON G arnet YIG) was prepared. The resonator effect is mediated by means of coupling lines.

Nachteilig an dem aus der oben genannten Druckschrift bekannten YIG-Bandpaßfilter ist insbesondere, daß in dem einstückigen Grundkörper des YIG-Bandpaßfilters durch das z.B. für Spektrumanalysatoren erforderliche schnelle Verstimmen des frequenzbestimmenden magnetischen Feldes Wirbelströme induziert werden, welche die Abstimmgeschwindigkeit begrenzen.A disadvantage of the YIG bandpass filter known from the above-mentioned publication is, in particular, that in the one-piece main body of the YIG bandpass filter by the e.g. For spectrum analyzers required fast detuning of the frequency-determining magnetic field eddy currents are induced, which limit the tuning speed.

Im Grunkörper des bekannten YIG-Bandpassfilters sind zur Unterdrückung von Wirbelströmen nur radiale Schlitze ausgebildet.In Grunkörper the known YIG bandpass filter only radial slots are formed for the suppression of eddy currents.

Aufgabe der vorliegenden Erfindung ist es demnach, einen Grundkörper für einen YIG-Filter zu schaffen, der die Induktion der durch das Abstimmen induzierten Wirbelströme in dem Grundkörper besser reduziert.It is therefore an object of the present invention to provide a main body for a YIG filter which better reduces the induction of the tuning induced eddy currents in the main body.

Die Aufgabe wird dadurch gelöst dass in dem Grundkörper in dem Ausnehmungen und/oder radiale Schlitze zur Unterdrückung von Wirbelstrom ausgebildet sind, zumindest eine innere, nicht mit Filterkammern verbundene Ausnehmung völlig zwischen Filterkammern angeordnet ist.The object is achieved in that formed in the body in the recesses and / or radial slots for the suppression of eddy current, at least one inner, not associated with filter chambers recess is disposed entirely between the filter chambers.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Grundkörpers sind in den Unteransprüchen angegeben.Advantageous developments of the basic body according to the invention are specified in the subclaims.

Im Folgenden wird anhand der Zeichnung ein bevorzugtes Ausführungsbeispiel der Erfindung beispielhaft dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigt:

Fig. 1
eine schematische Aufsicht auf ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Grundkörpers eines YIG-Bandpaßfilters.
In the following, a preferred embodiment of the invention is illustrated by way of example with reference to the drawing and explained in more detail in the following description. It shows:
Fig. 1
a schematic plan view of an embodiment of an inventively designed base body of a YIG bandpass filter.

Die Fig. 1 zeigt in einer schematischen Aufsicht ein Ausführungsbeispiel eines YIG-Bandpaßfilters 1, der einen Grundkörper 2 und im Ausführungsbeispiel vier in dem Grundkörper 2 ausgebildete Filterkammern 3 mit ebenso vielen YIG-Elementen 10 aufweist.The Fig. 1 shows a schematic plan view of an embodiment of a YIG bandpass filter 1, which has a base body 2 and in the embodiment, four in the base body 2 formed filter chambers 3 with as many YIG elements 10.

Die Filterkammern 3 sind durch Schlitze 4 miteinander verbunden, in welche der Übersichtlichkeit halber nicht weiter dargestellte Kopplungsleitungen eingelegt werden, die die Resonatorwirkung zwischen den Resonatoren 10 vermitteln. Die Anzahl der Filterkammern 3 ist dabei nicht auf vier beschränkt, sondern kann auch weniger oder mehr betragen.The filter chambers 3 are connected to each other by slots 4, in which the sake of clarity not shown coupling lines are inserted, which mediate the Resonatorwirkung between the resonators 10. The number of filter chambers 3 is not limited to four, but may be less or more.

Der YIG-Bandpaßfilter 1 umfaßt weitere Komponenten, welche unabhängig von den erfindungsgemäßen Maßnahmen sind und daher nur übersichtsweise dargestellt sind. Je eine Ein- und Auskoppelungsleitung 5 sind im Ausführungsbeispiel einander gegenüberliegend in dem Grundkörper 2 angeordnet. Stellvorrichtungen 6 für die YIG-Elemente 10, die eine korrekte Positionierung der im Ausführungsbeispiel vier YIG-Elemente 10 relativ zu den Kopplungsleitungen ermöglichen, sind in entsprechender Anzahl vorhanden. Die YIG-Elemente 10 sind auf Haltern 11 montiert, welche durch die Stellvorrichtungen 6 in ihrer Lage relativ zu den nicht dargestellten Koppelungsleitungen einstellbar sind.The YIG bandpass filter 1 comprises further components, which are independent of the measures according to the invention and are therefore only shown in an overview. Depending on an input and Auskoppelungsleitung 5 are in the embodiment arranged opposite one another in the base body 2. Actuators 6 for the YIG elements 10, which allow correct positioning of the four YIG elements 10 in the exemplary embodiment relative to the coupling lines, are present in a corresponding number. The YIG elements 10 are mounted on holders 11, which are adjustable by the adjusting devices 6 in their position relative to the coupling lines, not shown.

Die Filterwirkung eines YIG-Bandpaßfilters 1 beruht auf der Koppelung der Resonatoren 10, welche bei Resonanz einen Energietransport von der Einkoppelungs- zur Auskoppelungsleitung ermöglichen, diesen aber außerhalb der Resonanz verhindern. Die Arbeitsfrequenz des YIG-Bandpaßfilters 1 ist im wesentlichen durch die Stärke des angelegten Magnetfeldes bestimmt.The filter effect of a YIG bandpass filter 1 is based on the coupling of the resonators 10, which allow resonance at an energy transfer from the coupling to the decoupling, but prevent it outside the resonance. The operating frequency of the YIG bandpass filter 1 is essentially determined by the strength of the applied magnetic field.

Zur Bereitstellung des Magnetfeldes befinden sich die YIG-Elemente 10 in dem Grundkörper 2 in einem Luftspalt eines Elektromagneten. Der Grundkörper 2 besteht dabei vorzugsweise aus einem massiven nichtmagnetischem Metall. Dies hat den Vorteil einer einfachen mechanischen Bearbeitbarkeit, jedoch, wie bereits weiter oben erwähnt, den Nachteil der Induzierbarkeit von Wirbelströmen. Weiterhin dient der metallische Grundkörper 2 dazu, die einzelnen YIG-Filterstufen durch weitestmöglich geschlossene, leitende Flächen zu entkoppeln.To provide the magnetic field, the YIG elements 10 are located in the base body 2 in an air gap of an electromagnet. The base body 2 is preferably made of a solid non-magnetic metal. This has the advantage of a simple mechanical workability, but, as already mentioned above, the disadvantage of the inducibility of eddy currents. Furthermore, the metallic base body 2 serves to decouple the individual YIG filter stages by conducting surfaces which are as closed as possible.

Die Wirbelströme erzeugen ein dem ursprünglichen Magnetfeld entgegengerichtetes Magnetfeld und begrenzen dadurch die Abstimmgeschwindigkeit. Dabei kommen Wirbelströme im Bereich der Filterkammern 3 besonders zum Tragen, da diese unmittelbar das frequenzbestimmende Feld am Ort der YIG-Elemente 10 stören.The eddy currents produce a magnetic field opposing the original magnetic field and thereby limit the tuning speed. In this case, eddy currents in the area of the filter chambers 3 are particularly important because they directly disturb the frequency-determining field at the location of the YIG elements 10.

Zur Behebung der Nachteile weist der Grundkörper 2 Ausnehmungen 7 und mit diesen verbundene Schlitze 8 auf, welche der Unterdrückung der durch das schnelle Durchstimmen des YIG-Bandpaßfilters 1 im Grundkörper 2 induzierten Wirbelströme dienen.To overcome the disadvantages of the main body 2 recesses 7 and connected to these slots 8, which the suppression of the through fast tuning of the YIG bandpass filter 1 in the main body 2 induced eddy currents are used.

Die äußeren Ausnehmungen 7 sind radial außerhalb der Filter-Kammern 3 angeordnet. Die Schlitze 8 erstrecken sich zwischen den Filterkammern 3 nach radial außen. Die Ausnehmungen 7 weisen eine runden, abgerundeten oder langlochförmigen Querschnitt auf. Die äußeren Ausnehmungen 7 und die damit verbundenen Schlitze 8 sind so in dem Grundkörper 2 ausgebildet, daß eine Unterbrechung der Wirbelströme insbesondere im Nahbereich der YIG-Elemente 10 möglich ist. Hierzu wird mindestens ein Schlitz 8, im Ausführungsbeispiel zwei Schlitze 8 radial von innen nach außen in den Grundkörper 2 eingebracht, so daß in einem radial äußeren Bereich um die YIG-Elemente 10 eine Unterbrechung des geschlossenen Grundkörpers 2 und damit der Wirbelströme erfolgt. Die äußeren Ausnehmungen 7 und die Schlitze 8 schneiden sich in einem inneren Bereich. Zwischen den Filterkammern 3 ist eine weitere innere Ausnehmung 9, die im Ausführungsbeispiel kreuzförmig ausgebildet ist, vorgesehen, um die Wirbelströme im radial inneren Bereich des Grundkörpers 2 zu reduzieren.The outer recesses 7 are arranged radially outside the filter chambers 3. The slots 8 extend radially outward between the filter chambers 3. The recesses 7 have a round, rounded or slot-shaped cross-section. The outer recesses 7 and the associated slots 8 are formed in the base body 2, that an interruption of the eddy currents, in particular in the vicinity of the YIG elements 10 is possible. For this purpose, at least one slot 8, in the embodiment, two slots 8 radially inserted from the inside to the outside in the base body 2, so that in a radially outer region around the YIG elements 10 is an interruption of the closed body 2 and thus the eddy currents. The outer recesses 7 and the slots 8 intersect in an inner region. Between the filter chambers 3, a further inner recess 9, which is formed cross-shaped in the embodiment, is provided to reduce the eddy currents in the radially inner region of the base body 2.

Die äußeren Ausnehmungen 7 und die innere Ausnehmung 9 und die Schlitze 8 sind dabei in voller axialer Ausdehnung des Grundkörpers 2 in diesen eingebracht, um eine gute Unterdrückung des Wirbelstroms zu ermöglichen.The outer recesses 7 and the inner recess 9 and the slots 8 are introduced in full axial extent of the base body 2 in this, in order to allow a good suppression of the eddy current.

Je nach der Anzahl der Filterkammern 3 und der Anordnung der übrigen Komponenten sind auch Grundkörper 2 mit einem Schlitz 8 oder Grundkörper 2 mit mehreren Schlitzen 8 möglich. Dabei muß lediglich die mechanische Stabilität des Grundkörpers 2 zur Montage der einzelnen Komponenten beachtet werden.Depending on the number of filter chambers 3 and the arrangement of the other components and base body 2 with a slot 8 or body 2 with multiple slots 8 are possible. In this case, only the mechanical stability of the main body 2 for mounting the individual components must be considered.

Claims (8)

  1. Base element (2) for a YIG-bandpass filter (1),
    wherein the base element (2) is made of a nonmagnetic metal, and inter-connected filter chambers (3) are formed in the base element (2),
    wherein YIG-elements (10) are disposed in the filter chambers (3),
    wherein recesses (7, 9) and/or radial slots (8) are formed in the base element (2) in order to suppress eddy currents,
    and wherein at least one internal recess (9), which is not connected to the filter chambers, is disposed in its entirety between the filter chambers (3).
  2. Base element according to claim 1,
    characterised in that
    the recesses (7, 9) and/or the slots (8) extend over the entire axial thickness of the base element (2).
  3. Base element according to claim 1 or 2,
    characterised in that
    the slots (8) extend radially outwards between the filter chambers (3).
  4. Base element according to any one of claims 1 to 3,
    characterised in that
    the number of recesses (7) and/or of slots (8) is two.
  5. Base element according to any one of claims 1 to 4,
    characterised in that
    the recesses (7) provide a round, rounded or oblong cross-section.
  6. Base element according to any one of claims 1 to 5,
    characterised in that
    at least one external recess (7) is arranged radially outside the filter chambers (3).
  7. Base element according to claim 6,
    characterised in that
    the external recesses (7) are designed to be disposed on the slots (8).
  8. Base element according to claim 1,
    characterised in that
    the internal recess (9) is formed in the shape of a cross.
EP05803477A 2004-11-22 2005-11-03 Base body for a yig filter comprising eddy current suppression Active EP1812987B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056256A DE102004056256A1 (en) 2004-11-22 2004-11-22 Basic body for a YIG filter with eddy current suppression
PCT/EP2005/011779 WO2006056303A1 (en) 2004-11-22 2005-11-03 Base body for a yig filter comprising eddy current suppression

Publications (2)

Publication Number Publication Date
EP1812987A1 EP1812987A1 (en) 2007-08-01
EP1812987B1 true EP1812987B1 (en) 2008-04-16

Family

ID=35539690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803477A Active EP1812987B1 (en) 2004-11-22 2005-11-03 Base body for a yig filter comprising eddy current suppression

Country Status (5)

Country Link
US (1) US7504912B2 (en)
EP (1) EP1812987B1 (en)
JP (1) JP4555343B2 (en)
DE (2) DE102004056256A1 (en)
WO (1) WO2006056303A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007017837B4 (en) * 2007-04-16 2018-02-08 Rohde & Schwarz Gmbh & Co. Kg Device for stabilizing a YIG resonator
CN114069185B (en) * 2022-01-19 2022-05-03 电子科技大学 Adjustable static magnetic wave resonator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758800A (en) * 1987-04-02 1988-07-19 Raytheon Company Low noise magnetically tuned resonant circuit
US4794355A (en) * 1987-08-31 1988-12-27 Tektronix, Inc. Heat sink for magnetically tuned filter
US4857871A (en) * 1988-10-31 1989-08-15 Harris David L Magnetic field-tunable filter with plural section housing and method of making the same
US5418507A (en) * 1991-10-24 1995-05-23 Litton Systems, Inc. Yig tuned high performance filters using full loop, nonreciprocal coupling
EP0923151B1 (en) * 1992-06-01 2002-05-08 Poseidon Scientific Instruments Pty. Ltd. Dielecrically loaded cavity resonator
US5294899A (en) * 1992-07-29 1994-03-15 Hewlett-Packard Company YIG-tuned circuit with rotatable magnetic polepiece

Also Published As

Publication number Publication date
WO2006056303A1 (en) 2006-06-01
EP1812987A1 (en) 2007-08-01
DE502005003780D1 (en) 2008-05-29
US7504912B2 (en) 2009-03-17
JP2008521298A (en) 2008-06-19
US20080048805A1 (en) 2008-02-28
DE102004056256A1 (en) 2006-05-24
JP4555343B2 (en) 2010-09-29

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