EP1776733B1 - Filtre haute frequence - Google Patents

Filtre haute frequence Download PDF

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Publication number
EP1776733B1
EP1776733B1 EP05786313A EP05786313A EP1776733B1 EP 1776733 B1 EP1776733 B1 EP 1776733B1 EP 05786313 A EP05786313 A EP 05786313A EP 05786313 A EP05786313 A EP 05786313A EP 1776733 B1 EP1776733 B1 EP 1776733B1
Authority
EP
European Patent Office
Prior art keywords
frequency filter
filter according
inner conductor
resonator
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.)
Not-in-force
Application number
EP05786313A
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German (de)
English (en)
Other versions
EP1776733A1 (fr
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/fr
Application granted granted Critical
Publication of EP1776733B1 publication Critical patent/EP1776733B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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 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 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.
  • high-frequency filters are used today.
  • Stripline filters are also known from the prior art, which are significantly broadband than filters of coaxial design.
  • a conventional strip line 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.
  • the straight resonators or the legs of the U-shaped resonators formed at right angles to the strip line line.
  • the lateral spacing of the individual resonators in the direction of the stripline is in each case ⁇ / 4.
  • Filters in stripline technology are much easier to manufacture than filters of coaxial design, but stripline filters are much broader.
  • a generic high-frequency filter is from the EP-A-0 955 688 known.
  • This filter is constructed so that the filter cup and the inner conductor basically can be arranged on a printed circuit board.
  • the ground plane is preferably provided on the opposite side to the resonator. Instead of the printed circuit board but also a total of a metal strip can be used, which serves as a ground plane.
  • the peculiarity of this high-frequency filter is that the inner conductor, which is galvanically or capacitively connected at its opposite end of the ground surface with the pot bottom, is electrically connected to the side facing the printed circuit board with ground surface, as the resonator itself.
  • a high frequency filter is also from the US-A-4,996,506 known.
  • This is a conventional RF filter, which comprises one or more dielectric resonators with a ceramic housing, which is coated with an electrically conductive film.
  • the inner conductor is disposed dielectrically within the cavity of the resonator, ie within the ceramic housing.
  • the dielectric pillars are connected by means of ⁇ / 4 transmission lines.
  • the inner dielectric pillars are interconnected via strip lines that extend outside of the housing.
  • the object of the invention is to provide a narrow-band high-frequency filter, which is easier to manufacture compared to conventional coaxial high-frequency filters and has a more compact design.
  • the high-frequency filter according to the invention comprises a substrate of dielectric material having a first side and an opposite second side, wherein on the first side of the substrate at least one electrically conductive strip conductor is applied.
  • This strip conductor is electrically coupled to at least one resonator, wherein the resonator is not formed as a strip conductor, but a coaxial resonator with an outer conductor pot and a coaxially arranged in the outer conductor pot, substantially rod-shaped inner conductor.
  • the outer conductor pot is galvanically connected to a ground plane.
  • the inner conductor is galvanically and / or capacitively connected to the bottom of the outer conductor pot at a first end, wherein a galvanic connection is used in particular in the embodiment of the resonator as ⁇ / 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 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 consisting of outer conductor pot and inner conductor are used, which couple in a simple manner to an electrical line by means of stripline technology.
  • This high frequency filter is compared to conventional coaxial filters much cheaper to produce, since the individual resonators can be made separately with inexpensive methods and then coupled with a separately manufactured strip conductor on a substrate.
  • the high-frequency filter according to the invention thus combines the stripline technique with resonators according to coaxial design and thereby creates a filter that can be made easier compared to conventional coaxial filters and also 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, i. H. on the side opposite to the side with the applied stripline.
  • the ground surface is in particular a substantially continuous conductive layer on the second side of the substrate, wherein the edge of the opening opposite the pot bottom opening of the outer conductor pot is electrically connected to the conductive layer, in particular soldered to this, preferably a Schwalllötung is used.
  • the conductive layer in a preferred embodiment, has annular recesses which expose the dielectric material of the substrate, the edge of the opening of the outer conductor pot opposite the bottom of the pot being disposed around the annular recess.
  • the second end of the inner conductor, with which the coupling to the stripline is reached, 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 in a hole in the bottom of the outer conductor pot of the resonator, and in particular there soldered 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 essentially 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 can be turned metal parts, or the components are plastic parts that are metallized on the outer and / or inner surface.
  • the resonator is capacitively and / or inductively coupled to the at least one strip conductor, wherein the strip conductor may have, for example, a meandering structure.
  • the strip conductor can comprise branches, which form a circle and / or semicircle and / or a circle section, wherein the second end of the inner conductor is 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 axially aligned with a coaxial resonator tuning element for changing the electrical properties of the high frequency filter.
  • the tuning element can be, for example, a metallic pin displaceable in the cover and / or a metallic screw which can be rotated in the cover.
  • a plurality of 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 shown high-frequency filter comprises a dielectric substrate plate 1, on top 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 bar 4 is concentrically arranged in its middle, which is inserted at its upper end 4a in a corresponding hole in the pot bottom 3a and soldered or pressed there. Between inner conductor bar and the cylindrical side wall of the outer conductor pot, air is provided as a dielectric. The opposite lower end 4 b of the cylindrical inner conductor bar 4 is inserted into a corresponding opening 1 c 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, wherein annular recesses 1b, which expose the dielectric material of the substrate 1, are provided in the region of the circular pot openings of the outer conductor pots.
  • the outer edge of each recess 1b terminates in each case with an edge of the pot opening of an outer conductor pot, wherein the edge 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 Massekontäkt the outer conductor pot is made.
  • the underside 1e is partially hereinafter also referred to as the first side 1e and the top 1a partially as the second side 1a.
  • FIG. 2 shows a perspective, partially sectioned view of the filter of FIG. 1 from underneath.
  • the housing 5 is shown in section, so that the structure of the underside 1e of the substrate 1 becomes apparent.
  • 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 1c in which one end 4b of the inner conductor bar 4 is inserted.
  • the opening 1c is metallized here on the side 1e, but the metal has no connection to the circular branches 6b.
  • the inner conductor bar is soldered to the bottom 1e at the opening 1c.
  • the cover 5 surrounds the edge of the bottom 1e of the substrate 1, so that the entire bottom of the cover is enclosed.
  • 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 for example be a displaceable perpendicular to the substrate plate 1 metallic bolt. The distance of this bolt to the bottom 1e of the substrate plate 1 can be changed with the tuning element, whereby the frequency response of the filter can be influenced. It can be provided more tuning elements, each tuning element is 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 radio frequency from the UMTS mobile radio frequency in the 2000 MHz range.
  • the filter is narrowband compared to conventional strip line 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 casting parts.
  • resonators 3 are ⁇ / 4 resonators, in which the length of the inner conductor bar 4 corresponds to a quarter of the wavelength ⁇ .
  • the inner conductor bar 4 is electrically connected at its end 4 a to the pot bottom 3 a.
  • 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 is half the wavelength ⁇ .
  • the end 4a of the inner conductor bar is capacitively coupled to the bottom of the pot, for example, by the end 4a is connected to a metallic disc whose size is substantially equal to the size of the pot bottom 3a and the is spaced from the bottom of the pot.
  • the capacitive coupling acts as a short circuit at the resonant frequency.
  • FIG. 2 shows a plan view of the strip conductor.
  • the branches do not have to form a closed circle, but they may also comprise only circular sections.
  • FIG. 3 shows a plan view of the bottom 1e 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 with the branches 6b and 6c, respectively, the opening 1c is arranged, in which the end 4b of the inner conductor bar 4 is inserted.
  • the electrically conductive outer conductor pot 3 is electrically connected 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 peripheral edge.
  • Coaxially with the inner conductor 4 is arranged, which is electrically or capacitively connected to the pot bottom 3a at the bottom of the pot.
  • 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 is removed to one end, where it is electrically or capacitively connected to the pot bottom 3a electrically connected to the strip conductor.
  • 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)

Claims (23)

  1. Filtre à haute fréquence, présentant les éléments suivants :
    - il est prévu un substrat (1) en matériau diélectrique avec un premier côté (1e) et avec un second côté (1a) opposé,
    - sur le premier côté (1e) du substrat (1) est appliqué au moins un conducteur à ruban (6),
    - il est prévu au moins un résonateur (2) qui est couplé électriquement audit au moins un conducteur à ruban (6)
    - sur le second côté (1a) est prévue une surface de masse (1a') espacée du conducteur à ruban (6),
    - ledit au moins un résonateur (2) est un résonateur coaxial avec un pot conducteur extérieur (3) et un conducteur intérieur (4) sensiblement en forme de barreau et agencé coaxialement dans le pot conducteur extérieur (3), qui comprend une première extrémité (4a) et une seconde extrémité (4b) opposée à la première extrémité (4a),
    - le pot conducteur extérieur (3) est relié par voie galvanique à la surface de masse (1a'),
    - la seconde extrémité (4b) du conducteur intérieur (4) est couplée électriquement audit au moins un conducteur à ruban (6), et
    - le conducteur intérieur (4) est relié par une première extrémité (4a) par voie galvanique ou capacitive au fond de pot (3a) du pot conducteur extérieur (3),
    caractérisé par les autres éléments suivants :
    - ledit au moins un résonateur (2) est agencé sur le second côté (1a) du substrat (1), sur lequel est prévue la surface de masse (1a'),
    - le conducteur à ruban (6) prévu sur le premier côté (1e) est prévu sur le côté du substrat (1) opposé audit au moins un résonateur (2), et
    - la surface de masse (1a') conductrice présente au moins un évidement (1b) qui sépare la seconde extrémité (4b) du conducteur intérieur (4) vis-à-vis de la surface de masse (1b), le conducteur intérieur (4) étant couplé à sa seconde extrémité (4b) par voie galvanique ou capacitive et/ou par voie inductive au conducteur à ruban (6).
  2. Filtre à haute fréquence selon la revendication 1, caractérisé en ce que le conducteur à ruban (6) est connecté électriquement au pot conducteur extérieur (3) via le conducteur intérieur (4).
  3. Filtre à haute fréquence selon la revendication 1 ou 2, caractérisé en ce qu'il est prévu de l'air à titre de diélectrique entre le conducteur intérieur (4) et la paroi latérale du pot conducteur extérieur (3).
  4. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la surface de masse (1a') est une couche conductrice sensiblement continue sur le second côté du substrat (1), et le bord de l'ouverture du pot conducteur extérieur (3), opposée au fond de pot (3a), est relié par voie galvanique à la surface de masse (1a').
  5. Filtre à haute fréquence selon la revendication 4, caractérisé en ce que le bord de l'ouverture du pot conducteur extérieur (3), opposée au fond de pot (3a), est brasé sur la surface de masse (1a') conductrice, en particulier par brasage à la vague.
  6. Filtre à haute fréquence selon la revendication 4 ou 5, caractérisé en ce que ledit au moins un évidement (1b) dans la surface de masse (1a') conductrice est de forme annulaire, et en ce que le matériau diélectrique du substrat (1) est mis à découvert par l'évidement (1b), le bord de l'ouverture du pot conducteur extérieur (3), opposée au fond de pot (3a), étant agencé autour de l'évidement annulaire (1b).
  7. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la seconde extrémité (4b) du conducteur intérieur (4) est fixée sur le substrat (1).
  8. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le substrat (1) présente sur le second côté (1a) une échancrure et/ou un trou (1c) s'étendant jusqu'au premier côté (le), dans laquelle/lequel la seconde extrémité (4b) du conducteur intérieur (4) est mise en place et de préférence fixée par brasage.
  9. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la première extrémité (4a) du conducteur intérieur (4) est mise en place dans une échancrure et/ou dans un trou dans le fond de pot (3a) du pot conducteur extérieur (3) et est de préférence fixée au niveau du trou par brasage et/ou pressage avec le fond de pot.
  10. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que la direction axiale du résonateur (2) est sensiblement perpendiculaire au premier et/ou au second côté (1e, 1a) du substrat (1).
  11. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le pot de conducteur extérieur (3) et/ou le conducteur intérieur (4) est une pièce métallique tournée.
  12. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le pot conducteur extérieur (3) et/ou le conducteur intérieur (4) est une pièce en matière plastique qui est métallisée sur la surface extérieure et/ou intérieure.
  13. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que ledit au moins un résonateur (2) est couplé par voie capacitive et/ou inductive audit au moins un conducteur à ruban (6).
  14. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le conducteur à ruban (6) présente au moins partiellement une structure en méandres.
  15. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le conducteur à ruban (6) présente une ou plusieurs ramifications qui constituent un cercle et/ou une portion de cercle (6c), la seconde extrémité (4b) du conducteur intérieur (4) étant agencée au milieu du cercle et/ou de la portion de cercle.
  16. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un couvercle (5) sur le premier côté (1e) du substrat (1).
  17. Filtre à haute fréquence selon la revendication 16, caractérisé en ce que dans le couvercle (5) est prévu au moins un élément d'accord orienté sensiblement axialement avec un résonateur (2), afin de modifier la caractéristique électrique du filtre à haute fréquence.
  18. Filtre à haute fréquence selon la revendication 17, caractérisé en ce que ledit au moins un élément d'accord est une tige métallique mobile en translation dans le couvercle (5) et/ou une vis métallique rotative dans le couvercle (5).
  19. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que plusieurs résonateurs (2) sont agencés en direction longitudinale à côté du conducteur à ruban (6).
  20. Filtre à haute fréquence selon la revendication 19, caractérisé en ce que les résonateurs (2) présentent différentes tailles.
  21. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le substrat (1) est une plaque diélectrique.
  22. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que ledit au moins un résonateur (2) est couplé au conducteur à ruban (6) de telle sorte qu'il se forme un filtre passe-bande et/ou un filtre coupe-bande.
  23. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le filtre fonctionne dans la plage de fréquence de radiotéléphonie mobile de 1800 MHz et/ou dans la fréquence de radiotéléphonie mobile de 2000 MHz.
EP05786313A 2004-09-16 2005-09-15 Filtre haute frequence Not-in-force EP1776733B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045006A DE102004045006B4 (de) 2004-09-16 2004-09-16 Hochfrequenzfilter
PCT/EP2005/009939 WO2006029868A1 (fr) 2004-09-16 2005-09-15 Filtre haute frequence

Publications (2)

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

Family

ID=35266888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05786313A Not-in-force EP1776733B1 (fr) 2004-09-16 2005-09-15 Filtre haute frequence

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010056048A1 (de) 2010-12-23 2012-06-28 Kathrein-Werke Kg Abstimmbares Hochfrequenzfilter

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Publication number Priority date Publication date Assignee Title
US7570136B2 (en) 2006-09-20 2009-08-04 Alcatel-Lucent Usa Inc. Re-entrant resonant cavities, filters including such cavities and method of manufacture
EP2056394B1 (fr) 2007-10-31 2013-09-04 Alcatel Lucent Résonateur à cavité
EP2403053B1 (fr) 2010-06-29 2014-11-12 Alcatel Lucent Mécanisme de couplage pour cavité résonante rentrante à micro-ondes montée sur carte à circuit imprimé
WO2012167585A1 (fr) 2011-12-08 2012-12-13 华为技术有限公司 Filtre
DE102012022433A1 (de) 2012-11-15 2014-05-15 Kathrein-Austria Gmbh Hochfrequenzfilter
GB201222320D0 (en) * 2012-12-12 2013-01-23 Radio Design Ltd Filter assembly
DE102015006739A1 (de) 2015-05-22 2016-11-24 Kathrein-Austria Ges.M.B.H. Hochfrequenzleitersystem mit leitungsgebundener HF-Durchführung
KR101756124B1 (ko) * 2015-11-30 2017-07-11 주식회사 케이엠더블유 크로스 커플링 노치 구조를 구비한 캐비티 타입의 무선 주파수 필터
EP3240100A1 (fr) * 2016-04-28 2017-11-01 Alcatel Lucent Filtre de fréquence radio comprenant une chambre et procédé de filtrage

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010056048A1 (de) 2010-12-23 2012-06-28 Kathrein-Werke Kg Abstimmbares Hochfrequenzfilter
WO2012084154A1 (fr) 2010-12-23 2012-06-28 Kathrein-Werke Kg Filtre haute fréquence syntonisable

Also Published As

Publication number Publication date
EP1776733A1 (fr) 2007-04-25
US20080024249A1 (en) 2008-01-31
DE102004045006B4 (de) 2006-09-28
DE102004045006A1 (de) 2006-03-30
CN101053114A (zh) 2007-10-10
ATE414338T1 (de) 2008-11-15
DE502005005968D1 (de) 2008-12-24
WO2006029868A1 (fr) 2006-03-23
CN100578855C (zh) 2010-01-06

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