EP1721359B1 - Filtre haute frequence - Google Patents

Filtre haute frequence Download PDF

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Publication number
EP1721359B1
EP1721359B1 EP05715703A EP05715703A EP1721359B1 EP 1721359 B1 EP1721359 B1 EP 1721359B1 EP 05715703 A EP05715703 A EP 05715703A EP 05715703 A EP05715703 A EP 05715703A EP 1721359 B1 EP1721359 B1 EP 1721359B1
Authority
EP
European Patent Office
Prior art keywords
dielectric layer
high frequency
frequency filter
filter according
free end
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.)
Expired - Lifetime
Application number
EP05715703A
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German (de)
English (en)
Other versions
EP1721359A1 (fr
Inventor
Wilhelm Weitzenberger
Franz Rottmoser
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 SE
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
Application filed by Kathrein Werke KG filed Critical Kathrein Werke KG
Publication of EP1721359A1 publication Critical patent/EP1721359A1/fr
Application granted granted Critical
Publication of EP1721359B1 publication Critical patent/EP1721359B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/202—Coaxial filters
    • 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 coaxial design, in particular in the manner of a high-frequency filter (such as duplexer) or a band-pass filter or band-stop filter.
  • a high-frequency filter such as duplexer
  • a band-pass filter or band-stop filter such as duplexer
  • 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 suitable for transmitting and receiving in both frequency ranges.
  • a suitable frequency filtering is required, with the one hand, the transmission signals from the transmitter to the antenna and on the other hand, the received signals are forwarded from the antenna to the receiver.
  • inter alia high-frequency filters in coaxial design are used today.
  • a pair of high frequency filters may be used, both of which are a particular frequency band let through (bandpass filter).
  • a pair of high frequency filters may be used, both of which block a particular frequency band (bandstop filter).
  • a pair of high frequency filters may be used, one of which passes frequencies below a frequency between transmit and receive bands and blocks frequencies above that frequency (low pass filter), and the other filter blocks frequencies below a frequency between transmit and receive bands and overlying Passing frequencies (high pass filter).
  • Other combinations of the just mentioned filter types are conceivable.
  • High-frequency filters are often constructed from coaxial resonators, since they consist of milling or casting parts, whereby they are easy to produce. In addition, these resonators ensure a high electrical quality and a relatively high temperature stability.
  • This filter comprises a resonator with a cylindrical inner conductor and a cylindrical outer conductor, wherein between a free end of the inner conductor and a lid attached to the outer conductor, a capacitance is formed, which influences the. Resonant frequency has.
  • the resonator comprises a tuning element of dielectric material, with which the resonance frequency of the filter is adjustable. The tuning element is movable in the inner conductor of the resonator, whereby the capacitance between the free end of the inner conductor and the lid of the resonator is changed and thereby varies the resonant frequency.
  • a generic filter is known, for example, from "Patent Abstracts of Japan Vol. 011, No. 343 (E-555), Nov. 10, 1987 (1987-11-10) & JP 62 123801 A (MATSUSHITA ELECTRIC Ind. Co. Ltd.), June 5, 1987 (1987-06-05).
  • "It is a filter according to the preamble of claim 1, which has a screw for adjusting the high-frequency filter, which passes through a cover of the high-frequency filter and can be adjusted by turning in its axial position facing the inner conductor is on the front side the screw provided a dielectric. By tightening and loosening the screw, the dielectric is adjusted in its relative position to the underlying inner conductor, so that the distance formed between the underside of the dielectric and the front-side top of the inner conductor tube and thus the resonance frequency can be changed.
  • Object of the present invention is therefore to provide a high-frequency filter in coaxial design, which has a high dielectric strength at the same time low volume.
  • the high-frequency filter comprises an electrically conductive inner conductor embodied as an inner conductor tube, an electrically conductive outer conductor and an electrically conductive base which electrically connects the inner conductor and the outer conductor to one another. Furthermore, a lid is provided which covers the high frequency filter from the ground. The lid has an inside and outside with the inside facing a free end of the inner conductor tube.
  • a dielectric layer with a relative dielectric constant greater than 2 is arranged between the outside of the cover and the free end of the inner conductor tube. The radial extent of the dielectric layer essentially covers the cross section of the inner conductor tube at its free end.
  • Such a dielectric layer becomes due to the high dielectric constant an increase in the capacity and thus a reduction in the resonant frequency achieved without increasing the volume of construction. Moreover, since the dielectric layer covers substantially the entire cross section of the inner conductor tube, the dielectric strength between the inner conductor tube and the lid is improved.
  • the dielectric layer is inserted in a receptacle in the inside of the lid.
  • the dielectric layer may be held in the receptacle by positive locking, in particular by an edge projecting beyond the edge of the dielectric layer on the inside of the cover.
  • the dielectric layer may be held on the inside of the lid by adhesive, in particular adhesive.
  • the dielectric layer terminates with the inside of the lid.
  • the dielectric layer used is a high-dielectric material having a relative dielectric constant of greater than or equal to 5, preferably greater than or equal to 8, particularly preferably greater than or equal to 9.
  • materials of much higher dielectric constant such as materials having a relative dielectric constant greater than or equal to 40, may be used.
  • the constant may be between 40 and 80 or between 60 and 80.
  • materials with high dielectric constants are for the dielectric layer z.
  • ceramic materials used in particular alumina ceramic.
  • the area of the radial extent of the dielectric layer is at least 2 times the area of the cross section of the inner conductor tube at its free end.
  • a large coverage of the inner conductor tube is achieved with dielectric material, so that a very high dielectric strength is ensured.
  • the cross section of the inner conductor tube is substantially circular at its free end.
  • the radial extent of the dielectric layer may be substantially circular. If both the cross section of the inner conductor tube at its free end and the radial extension of the dielectric layer are circular, in a preferred variant of the invention the diameter of the radial extension is at least as large as the diameter of the cross section. Preferably, the diameter of the radial extent is at least 1.5 times the diameter of the cross section.
  • the outer conductor may also have a substantially circular cross-section, the diameter of which is preferably at least twice the diameter of the radial extent of the dielectric layer.
  • the high-frequency filter has a plurality of resonators, wherein a single continuous, at least partially strip-shaped dielectric layer is provided for all resonators.
  • the high-frequency filter according to the invention is preferably designed such that a duplexer is formed by the design and coupling of the resonators.
  • a duplexer is formed by the design and coupling of the resonators.
  • an embodiment as a bandpass filter or Bandsperrfilter conceivable.
  • FIG. 1 shows the side view of a resonator for use in a high-frequency filter according to the invention. It is a resonator in coaxial design, which extends along the axis A.
  • the resonator comprises an electrically conductive cylindrical inner conductor tube 1, the lower end 1b of which is inserted in a base 3.
  • the bottom 3 is also cylindrical and on its outer edge connected to a cylindrical outer conductor tube 2. Over the bottom 3, an electrically conductive connection between outer conductor tube 2 and inner conductor tube 1 is produced.
  • On the outer tube is a cover 5 with the inside 5a and the outside 5b.
  • a black dielectric 6 is used on the inside 5a.
  • the dielectric lies opposite a free end 1a of the inner conductor tube 1.
  • the distance 4 between the lid 5 and the free end 1a of the inner conductor tube 1 is usually 3 to 4 mm and can be reduced to 0.5 mm.
  • the dielectric layer terminates with the inside of the lid. It is also possible that the dielectric layer protrudes from the inside of the lid or the inside of the lid protrudes beyond the dielectric layer.
  • the resonator of Figure 1 arises at resonance at the free end 1a, a voltage increase, wherein the amount of voltage is proportional to the signal power with which the resonator is acted upon.
  • the top of the free end of the inner conductor tube 1 and the inner side 5a of the lid form a plate capacitor whose capacitance C roof is directly proportional to the relative dielectric constant ⁇ r of the material between the capacitor.
  • high-dielectric material 6 with a relative dielectric constant ⁇ r is used, which lies clearly above air.
  • the relative dielectric constant has values above 40. This means that the capacity C roof - in contrast to conventional resonators - is very high.
  • f represents the resonant frequency of the resonator
  • L the inductance of the resonator
  • C the capacitance of the resonator
  • C roof the described parallel capacitance at the top of the resonator.
  • the higher the C roof the lower the resonance frequency.
  • a resonator with a low resonance frequency can thus be created.
  • resonators with low resonance frequencies have not been achieved by the use of a dielectric, but by reducing the distance between the lid and the free end of the inner conductor tube. The reduction of this distance, however, limits are set, since this greatly reduces the dielectric strength of the resonator.
  • resonators of the prior art alternatively use wider inner conductor tubes, which also reduces the resonant frequency. However, this leads to a larger resonator volume and thus to higher material and processing costs.
  • a low resonance frequency a high dielectric strength and a low overall volume can be achieved.
  • FIG. 2 shows a plan view of the resonator of FIG. 1. It can be seen here in particular that the inner conductor tube 1 and the outer conductor tube 2 are of cylindrical design. In addition, the radial extent of the dielectric layer 6, whose circular Edge in Figure 2 is denoted by 6 '. So that a high dielectric strength is given even at small distances between free end 1a of the inner conductor tube and the cover 5, the diameter d 1 of the dielectric layer is greater than the diameter d 2 of the cross section of the inner conductor tube. Preferably, the diameter d 1 is 1.5 times the diameter d 2 .
  • the diameter d 3 of the outer conductor tube is substantially larger than the diameter d 1 and d 2 . In a preferred variant, the diameter d 3 is twice as large as the diameter d 1 .
  • FIG. 3 shows a plan view of a modification of the resonator of FIG. 2.
  • the outer conductor 2 is not cylindrical, but substantially square with rounded corners.
  • the shape of the inner conductor 1 and the dielectric layer 6 is furthermore cylindrical or circular.
  • the inner conductor tube or the dielectric layer have other shapes, in particular they can also be designed square. It is only necessary to ensure that the radial extent of the dielectric layer has at least one size which corresponds to the cross-sectional area of the inner conductor tube.
  • Figure 4 shows a plan view of a possible embodiment of the inner side 5a of the lid 5 of Figure 1.
  • the inside of the lid is shown hatched. It can be seen that an inner edge 5 'of the lid projects beyond the dielectric layer 6.
  • a retention of the dielectric layer in the receptacle of the cover 5 is ensured by means of positive locking.
  • the dielectric layer 6 may be glued in the receptacle.
  • FIG. 5 shows the top view of a bandpass filter in which four of the resonators of FIG. 3 are used, the cover of the resonators not being shown.
  • the outer conductors of the individual resonators are connected to each other via aperture 7, so that an entire circumferential housing 2 'is formed.
  • the degree of coupling is determined by the distance between the resonators and the size of the aperture.
  • the center frequency of the bandpass filter is proportional to the length of the inner conductor tube first
  • FIG. 6 shows a sectional view of the bandpass filter according to FIG. 5 along the line I-I, the cover of the bandpass filter being mounted on the upper side. It can be seen that a continuous cover 5 "rests on the upper side of the housing 2 '.
  • a dielectric layer 6 is again provided opposite the free end 1a of the respective inner conductor 1, by means of which the dielectric strength and the size of the bandpass filter Alternatively, a single continuous dielectric layer may be provided in the form of a strip, the strip extending longitudinally of the housing 2 'and having a width such that each inner conductor tube is covered by the strip.

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

Claims (16)

  1. Filtre haute fréquence à structure coaxiale, comprenant un ou plusieurs résonateurs (R) qui présentent les éléments suivants :
    - un conducteur intérieur électriquement conducteur réalisé sous forme de tube conducteur intérieur (1) ;
    - un conducteur extérieur électriquement conducteur (2) ;
    - un fond (3) électriquement conducteur, qui relie électriquement le conducteur intérieur et le conducteur extérieur (2) l'un à l'autre ;
    - un couvercle (5) qui recouvre le filtre haute fréquence à l'opposé du fond (3) avec une face intérieure (5a) et une face extérieure (5b), la face intérieure (5a) étant tournée vers une extrémité libre (1a) du tube conducteur intérieur (1) ;
    - entre la face extérieure (5b) du couvercle (5) et l'extrémité libre (1a) du tube conducteur intérieur (1) est agencée une couche diélectrique (6) avec une constante diélectrique relative supérieure à 2 ;
    - l'extension radiale de la couche diélectrique (6) couvre essentiellement la section du tube conducteur intérieur (1) à son extrémité libre (1a);
    - la couche diélectrique (6) est agencée sur le couvercle (5) ;
    caractérisé en ce que
    - la couche diélectrique (6) est mise en place dans un logement dans la face intérieure (5a) du couvercle (5).
  2. Filtre haute fréquence selon la revendication 1, caractérisé en ce que la couche diélectrique (6) est tenue dans le logement par coopération de formes, en particulier au moyen d'une bordure (5'), à la face intérieure (5a) du couvercle (5), qui dépasse au-delà de la bordure de la couche diélectrique (6).
  3. Filtre haute fréquence selon la revendication 1 ou 2, caractérisé en ce que la couche diélectrique (6) est juxtaposée à la face intérieure (5a) du couvercle (5).
  4. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la couche diélectrique (6) et tenue contre la face intérieure (5a) du couvercle (5) par des moyens adhésifs, en particulier de la colle.
  5. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la constante diélectrique relative de la couche diélectrique (6) est ≥ 5, de préférence ≥ 8, de façon particulièrement préférée ≥ 9.
  6. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la constante diélectrique relative de la couche diélectrique est ≥ 40, de préférence entre 40 et 80, de façon particulièrement préférée entre 60 et 80.
  7. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la couche diélectrique (6) comprend un matériau céramique, en particulier une céramique en oxyde d'aluminium.
  8. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la surface de l'extension radiale de la couche diélectrique (6) est au moins deux fois la surface de la section transversale du tube conducteur intérieur (1) à son extrémité libre (1a).
  9. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la section du tube conducteur intérieur (1) à son extrémité libre (1a) est essentiellement de forme circulaire.
  10. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que l'extension radiale de la couche diélectrique (6) est essentiellement de forme circulaire.
  11. Filtre haute fréquence selon la revendication 9 et 10, caractérisé en ce que le diamètre (d1) de l'extension radiale de la couche diélectrique (6) correspond au moins au diamètre (d2) de la section transversale du tube conducteur intérieur (1) à son extrémité libre.
  12. Filtre haute fréquence selon la revendication 11, caractérisé en ce que le diamètre (d1) de l'extension radiale de la couche diélectrique (6) est au moins 1,5 fois le diamètre (d2) de la section du tube conducteur intérieur (1) à son extrémité libre.
  13. Filtre haute fréquence selon l'une des revendications 10 à 12, caractérisé en ce que le conducteur intérieur (2) est un tube conducteur extérieur avec une section essentiellement circulaire, et le diamètre (d3) du tube conducteur extérieur est au moins deux fois le diamètre de l'extension radiale de la couche diélectrique (6).
  14. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le filtre haute fréquence comprend plusieurs résonateurs (R), et dans lequel il est prévu une unique couche diélectrique continue pour tous les résonateurs (R), réalisée au moins partiellement en forme de bande.
  15. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que les résonateurs (R) sont réalisés et accouplés de telle façon que l'on forme un séparateur duplex.
  16. Filtre haute fréquence selon l'une des revendications 1 à 15, caractérisé en ce que les résonateurs (R) sont réalisés et accouplés de telle façon que l'on forme un filtre passe-bande ou un filtre à blocage de bande.
EP05715703A 2004-03-04 2005-03-03 Filtre haute frequence Expired - Lifetime EP1721359B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004010683A DE102004010683B3 (de) 2004-03-04 2004-03-04 Hochfrequenzfilter
PCT/EP2005/002248 WO2005086275A1 (fr) 2004-03-04 2005-03-03 Filtre haute frequence

Publications (2)

Publication Number Publication Date
EP1721359A1 EP1721359A1 (fr) 2006-11-15
EP1721359B1 true EP1721359B1 (fr) 2007-06-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715703A Expired - Lifetime EP1721359B1 (fr) 2004-03-04 2005-03-03 Filtre haute frequence

Country Status (8)

Country Link
US (1) US7486162B2 (fr)
EP (1) EP1721359B1 (fr)
KR (1) KR101157689B1 (fr)
AT (1) ATE364909T1 (fr)
DE (2) DE102004010683B3 (fr)
DK (1) DK1721359T3 (fr)
ES (1) ES2285684T3 (fr)
WO (1) WO2005086275A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014001917A1 (de) 2014-02-13 2015-08-13 Kathrein-Werke Kg Hochfrequenzfilter in koaxialer Bauweise

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US7853325B2 (en) * 2001-04-13 2010-12-14 Greatbatch Ltd. Cylindrical bandstop filters for medical lead systems
DE102006033704B3 (de) 2006-07-20 2008-01-03 Kathrein-Werke Kg Hochfrequenzfilter in koaxialer Bauweise, insbesondere nach Art einer Hochfrequenzweiche (z.B. einer Duplex-Weiche) oder eines Bandpassfilters oder Bandsperrfilters
JP4737291B2 (ja) * 2006-08-31 2011-07-27 パナソニック株式会社 フィルタ装置とその製造方法
US7570136B2 (en) * 2006-09-20 2009-08-04 Alcatel-Lucent Usa Inc. Re-entrant resonant cavities, filters including such cavities and method of manufacture
DE102007061413A1 (de) 2007-12-11 2009-06-25 Telegärtner Karl Gärtner GmbH Hochpassfilter
US8362853B2 (en) * 2009-06-19 2013-01-29 Qualcomm Incorporated Tunable MEMS resonators
DE102010056048A1 (de) 2010-12-23 2012-06-28 Kathrein-Werke Kg Abstimmbares Hochfrequenzfilter
KR101869757B1 (ko) 2012-02-27 2018-06-21 주식회사 케이엠더블유 캐비티 구조를 가진 무선 주파수 필터
WO2013129817A1 (fr) * 2012-02-27 2013-09-06 주식회사 케이엠더블유 Filtre de fréquence radio ayant une structure de cavité
KR20160118667A (ko) 2015-04-02 2016-10-12 한국전자통신연구원 공진기 필터
DE102016104608A1 (de) 2016-03-14 2017-09-14 Kathrein-Werke Kg Koaxialfilter in Rahmenbauweise
DE102017119907A1 (de) 2017-08-30 2019-02-28 Kathrein Se Koaxialfilter
KR101939989B1 (ko) * 2018-08-01 2019-01-18 주식회사 엘트로닉스 고주파 필터
DE102023203996A1 (de) * 2023-04-28 2024-10-31 Bruker Switzerland Ag Hochfrequenz-Bandpassfilter für eine MR-Apparatur mit Spulenkörper mit einem Hohlraum, MR-Apparatur

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JPS62123801A (ja) * 1985-11-25 1987-06-05 Matsushita Electric Ind Co Ltd 同軸型フイルタ
JPH04332202A (ja) * 1991-05-08 1992-11-19 Kyocera Corp 分布定数型２分割方式の誘電体共振単位体
DE19917087C2 (de) 1999-04-15 2001-07-26 Kathrein Werke Kg Hochfrequenzfilter
EP1077514A3 (fr) * 1999-08-19 2001-10-24 FILTEC FILTERTECHNOLOGIE FUR DIE ELEKTRONIKINDUSTRIE GmbH Filtre multiple
ATE385063T1 (de) * 2000-01-31 2008-02-15 Gen Electric Stützblock zur begrenzung der auslenkung einer anschlussverbindung in einer elektrischen maschine
SE520203C2 (sv) * 2000-03-30 2003-06-10 Allgon Ab En koaxiell kavitetsresonator, filter och användning av resonatorkomponent i ett filter
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US6778042B2 (en) 2000-10-30 2004-08-17 Kabushiki Kaisha Toshiba High-frequency device
US20060255888A1 (en) * 2005-05-13 2006-11-16 Kathrein Austria Ges.M.B.H Radio-frequency filter

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Publication number Priority date Publication date Assignee Title
DE102014001917A1 (de) 2014-02-13 2015-08-13 Kathrein-Werke Kg Hochfrequenzfilter in koaxialer Bauweise

Also Published As

Publication number Publication date
US20070194865A1 (en) 2007-08-23
KR20060129320A (ko) 2006-12-15
DE502005000873D1 (de) 2007-07-26
DK1721359T3 (da) 2007-10-08
EP1721359A1 (fr) 2006-11-15
ES2285684T3 (es) 2007-11-16
DE102004010683B3 (de) 2005-09-08
ATE364909T1 (de) 2007-07-15
KR101157689B1 (ko) 2012-06-20
US7486162B2 (en) 2009-02-03
WO2005086275A1 (fr) 2005-09-15

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