EP2912714B1 - Filtre réglable à haute fréquence - Google Patents

Filtre réglable à haute fréquence Download PDF

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Publication number
EP2912714B1
EP2912714B1 EP13782980.0A EP13782980A EP2912714B1 EP 2912714 B1 EP2912714 B1 EP 2912714B1 EP 13782980 A EP13782980 A EP 13782980A EP 2912714 B1 EP2912714 B1 EP 2912714B1
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EP
European Patent Office
Prior art keywords
housing
tuning element
internal conductor
socket
housing cover
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.)
Active
Application number
EP13782980.0A
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German (de)
English (en)
Other versions
EP2912714A1 (fr
Inventor
Ralf BUCHAUER
Bernd SCHÖNINGER
Wilhelm Weitzenberger
Armin HOLZBAUER
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
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Publication date
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Publication of EP2912714A1 publication Critical patent/EP2912714A1/fr
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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
    • H01P1/201—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
    • 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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the invention relates to a high-frequency filter in coaxial design 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 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 in coaxial design.
  • Two interconnected high-frequency filters form a so-called duplex switch, which allows a largely decoupled interconnection of transmitters and receivers to a common antenna.
  • a pair of high-frequency filters can be used, both of which allow a certain frequency band (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 filters below a frequency between transmit and receive bands and blocks frequencies above that frequency (low pass filter) and the other filter locks frequencies below a frequency between transmit and receive bands and above 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.
  • a temperature-compensated coaxial resonator is out of the WO 2006/058965 A1 known. It comprises according to an embodiment in addition to a coaxial housing with a corresponding inner conductor, which ends at a distance below a lid, an embodiment for adjusting the resonant frequency. As usual, a screw is used which can be turned in and out in different ways in the lid.
  • the actuator is located axially aligned with the inner conductor and has at its the inner conductor facing the front end of a dielectric compensation element, which is designed disk-shaped, on.
  • the single-circuit band filter comprises an inner conductor with a cup-shaped capacitive load formed at the free end of the inner conductor whose diameter corresponds to a multiple of the diameter of the inner conductor.
  • a pot-like punch can be immersed, which is attached to a rod which is slidably mounted in a bushing at the opposite end of the free end of the inner conductor wall of the band filter.
  • the EP 2 044 648 B1 describes an example of a coaxial RF filter.
  • This filter comprises a resonator with an inner conductor and an outer conductor, wherein in a housing cover of the resonator, a tuning element is provided which has an external thread.
  • a threaded receptacle is provided with a thread.
  • the thread pitch of the external thread of the tuning element differs from the thread pitch of the internal thread of the threaded receptacle in at least a portion of the internal thread and the external thread, whereby an automatic self-locking of the Abstimmelements is realized.
  • the US 4,380,747 describes another example of a coaxial high frequency filter.
  • the high frequency filter disclosed in this document comprises a coaxial resonator consisting of an electrically conductive outer conductor and an electrically conductive inner conductor. The outer conductor and the inner conductor are connected to one another via an electrically conductive base plate.
  • the coaxial resonator is terminated by an electrically conductive cover.
  • the frequency tuning is done by a grub screw whose immersion depth in the inner conductor is frequency-determining. If the frequency has been set precisely, the balancing threaded pin is fixed with a counter nut.
  • a disadvantage of this type of coaxial resonator is the critical contact transition from the threaded pin to the lid.
  • the high-frequency filters described above have the common feature that the tuning elements, which are held in the housing cover variable in position, made of metal.
  • the change in position of the tuning elements is achieved in that the tuning elements have an external thread which is screwed into an internal thread of the housing cover. Consequently, the threads are located in the high-frequency-critical resonator interior, which inevitably causes intermodulation problems.
  • made of aluminum resonator housing for receiving the corresponding tuning element press-in thread since aluminum is too soft for fine thread, so that the thread of the adjustment can seize.
  • the tuning elements in the coaxial high-frequency filters described above are arranged at high-frequency critical points, so that currents also flow over the contact region of the external thread of the tuning element and the internal thread of the resonator housing.
  • EP 2 044 648 B1 This problem is addressed by strained threads.
  • a corresponding coaxial RF filter is expensive to manufacture and therefore expensive.
  • high-frequency filters known from the prior art have insufficient frequency stabilization with a temperature change.
  • temperature fluctuations occur, there is a change in the mechanical length of the inner conductor tube. Since the mechanical length is inversely proportional to the frequency, the resonant frequency of the filter decreases as the mechanical length increases with increasing temperature. For example, this effect can cause a change in the resonant frequency of 5.7 MHz for a filter with a resonant frequency of 2.4 GHz at a temperature difference of 120 ° C.
  • This high-frequency coaxial resonator comprises an outer conductor housing with an inner conductor tube arranged axially thereon.
  • the inner conductor tube ends at a distance below a lid closing the outer conductor housing.
  • the inner conductor tube is provided with a longitudinal bore passing through the inner conductor tube into which a screw can be screwed from below.
  • the screw can be screwed into a counterpart, which has a circumferential edge at a distance from the free end of the inner conductor tube, so that a bellows-shaped element can be inserted between this peripheral edge of the counterpart and the free end edge of the inner conductor tube.
  • the screw has a coefficient of thermal expansion which is less than the thermal expansion coefficient of the existing example of aluminum inner conductor tube.
  • the bellows-shaped compensation element further consists of a different material compared to the material of the screw and the inner conductor tube.
  • this embodiment also has various disadvantages, since additional elements are necessary, since the bellows-shaped element must be welded to the circumferential end wall of the inner conductor tube, etc. Intermodulation problems can also be caused thereby.
  • a generic high frequency filter is from the EP 0 068 919 A1 known. It comprises an inner conductor which is anchored to a wall of the filter and extends in the direction of an opposite wall and ends in front of this wall. At the free end of this inner conductor a blind hole is introduced.
  • the inner conductor has a same outer diameter over its entire length.
  • an adjustment element is anchored in the wall.
  • This adjusting element comprises a screw-threaded metal piece, which is screwed with an external thread in an internally threaded bore of the wall.
  • an inner bore is introduced, in which engages an axially displaceable pin.
  • This pin may be made of metal or of a dielectric material.
  • a blind bore is also introduced, in which a dielectric rod is used, which ultimately projects beyond the externally threaded metal piece frontally and engage differently in the blind hole in the inner conductor depending on the setting of the setting ,
  • the setting pin with the dielectric rod as a whole can be formed as a dielectric component.
  • the high-frequency filter according to the invention is based on a tuning element, which comprises a dielectric material and / or is formed from a dielectric material.
  • a tuning element which comprises a dielectric material and / or is formed from a dielectric material.
  • the housing bottom in the high-frequency filter according to the invention has no adjustment opening, which eliminates additional sealing measures such as sealing films, sealing adhesives or environmental cover in outdoor applications. It is also advantageous that the thermal expansion of the existing of a dielectric material or such comprehensive Abstimmelements in the high-frequency filter has a temperature-compensating effect, ie temperature-induced frequency changes can be significantly minimized.
  • a suitably trained tuning element is particularly inexpensive to manufacture, since due to the choice of material, the tuning can be made very inexpensively, for example by injection molding.
  • the tuning element according to the invention has a central portion, by means of which the tuning element is held variable in position. Furthermore, the tuning element on a Umlaufwandung, by a circumferential around the central portion recess of the central portion is separated, so that between the central portion and the Umlaufwandung a distance space is formed.
  • the central portion is connected to the Umlaufwandung via a Abstimmelementboden.
  • the housing bottom opposite end face end of the socket is receivable in the space between the central portion and Umlaufwandung the Abstimmelements, so that the Umlaufwandung between the socket and the inner conductor is arranged in the region of the longitudinal recess.
  • the tuning element is thus bell-shaped and is inversely T-shaped in cross section.
  • the resonant frequency of the resonator is particularly effective adjustable.
  • the correspondingly formed high-frequency filter has particularly good temperature compensation properties.
  • an appropriately designed high-frequency filter ensures effective overvoltage protection. Because the distance between the inner conductor tube in the region of the end face and the housing bottom facing the front end of the socket is particularly small, so that in this area the maximum electric field strength occurs at the so-called open end of the inner conductor. At this point there is an increased risk of overturning at higher transmission powers due to resonance effects.
  • the peripheral wall of the tuning element is arranged between the inner conductor tube and the threaded bush, so that the balancing element or the tuning element reliably protects against flashovers due to its insulating effect.
  • the tuning element further comprises a circumferential to the tuning collar, which is connected to the housing cover opposite the front end of the Umlaufwandung and extends radially directed away from the central portion.
  • An appropriately designed high-frequency filter has a further increased flashover protection at the open end of the inner conductor, since the collar spans the frontal end of the inner conductor, so that a flashover between the inner conductor and the inner housing cover side is reliably prevented.
  • the peripheral wall of the tuning element has a peripheral edge, so that the peripheral wall above the peripheral edge, i. directed towards the housing cover has a smaller wall thickness than below the peripheral edge, i. directed towards the case back.
  • An appropriately designed high-frequency filter has again improved temperature compensation properties.
  • the female part receiving the tuning element can be materially connected to the housing cover.
  • This can for example be achieved in that the housing cover is made of a casting, wherein the socket is an integral part of the cast cover.
  • the socket can also be a separate component which is connected to the housing cover.
  • a corresponding connection can be realized, for example, by pressing the socket into the housing cover or by soldering or welding the socket to the housing cover.
  • the inner conductor has a longitudinal recess which extends from the housing cover opposite the front end of the inner conductor in the direction of the housing bottom, wherein the tuning element is insertable into the longitudinal recess of the inner conductor.
  • the tuning element is insertable into the longitudinal recess of the inner conductor.
  • the bush ends at the level of the front end of the inner conductor or immersed in the longitudinal recess of the inner conductor, wherein the tuning element protrudes from the housing bottom opposite the front end of the socket.
  • a corresponding embodiment of the high-frequency filter allows a particularly effective adjustment of the resonant frequency of the high-frequency filter.
  • the housing wall and the inner conductor of a first material having a first coefficient of thermal expansion or the housing wall consists of a first coefficient of thermal expansion having first material and the inner conductor consists of a second coefficient of thermal expansion having second material.
  • the tuning element consists of a third material having a third coefficient of thermal expansion. The third thermal expansion coefficient of the third material is greater than the first thermal expansion coefficient of the first material and / or greater than the second thermal expansion coefficient of the second material.
  • the tuning element At a temperature increase expands in the axial direction of the Abproements the tuning element stronger than the inner conductor and the housing wall, so that a greater proportion of Umlaufwandung is arranged above the peripheral edge between the inner conductor and the socket, resulting in less dielectric material between the inner conductor and the Socket, which reduces the head capacity of the resonator. Conversely, when the temperature is reduced, the tuning element contracts more in the axial direction than the inner conductor and the housing wall, so that a smaller portion of the peripheral wall is located above the peripheral edge between the inner conductor and the socket, resulting in more dielectric material between the inner conductor and the socket which increases the head capacitance of the resonator.
  • the height of the sleeve provided on the housing cover with the internal thread in relation to the diameter of the socket to a degree which is greater than or equal to 1.5.
  • FIG. 1 a high-frequency filter according to the invention is shown, which comprises a resonator 1.
  • the high-frequency filter can also comprise a plurality of resonators 1 coupled to one another.
  • Each resonator 1 comprises an inner conductor 10 and an outer conductor housing which in turn comprises a housing bottom 20, a housing cover 22 spaced from the housing bottom 20 and a housing wall 24 encircling the housing bottom 20 and the housing cover 22.
  • the inner conductor 10 is formed integrally with the housing bottom 20 and the housing wall 24.
  • the housing cover 22 lies on the free ends of the housing wall 24 and may be mechanically connected, for example by means not shown screws with the end faces of the housing wall.
  • the housing cover 22 is formed integrally with the housing wall.
  • a free end 11 of the inner conductor 10, which is the end face of the inner conductor 10, has a predetermined distance to the inside of the housing cover 22.
  • the inner conductor 10 has a longitudinal recess 12 which extends from the housing cover 22 opposite the front end of the inner conductor 10 in the direction of the housing bottom 20.
  • the inner conductor 10 are formed as inner conductor tubes 10 and as inner conductor cylinder 10.
  • the high-frequency filter further comprises a bushing 40, which is formed in the illustrated embodiments as a threaded bushing 40 with an internal thread 41.
  • the threaded bushing 40 is galvanically connected to the housing cover 22.
  • the threaded bushing 40 may consequently consist of a metal or may consist of a dielectric material which is coated with a metal layer.
  • the bush 40 may also be integrally formed with the housing cover 22, so that the bushing 40 is integrally connected to the housing cover 22.
  • the threaded bushing 40 with the housing cover 22, for example by a Pressing is connected.
  • the threaded bushing 40 may be galvanically connected to the housing cover 22 via a soldering or welding.
  • the threaded bushing 40 dips into the longitudinal recess 12 of the inner conductor 10. However, it is also possible that the threaded bush 40 ends at the level of the front end 11 of the inner conductor 10. It is also possible that the threaded bush 40 ends above the front end 11 of the inner conductor 10.
  • the in the Figures 1 and 2 shown threaded bushing 40 also extends outside the Resonatorinnenraums, so that the housing wall of the threaded bushing 40 extends beyond the housing cover 22 to the outside.
  • the high-frequency filter according to the invention further comprises a tuning element 30, which is held in its axial position variable in position in the socket 40.
  • the tuning element 30 has for this purpose an external thread 32 on a central portion 31.
  • the external thread 32 is engaged with the internal thread 41 of the threaded bushing 40, so that its axial position can be changed by rotation of the tuning element 30.
  • the tuning element 30 further comprises a circumferential wall 33, which is separated from the central section 31 by a recess 35 running around the central section 31. Thus, a distance space 35 is formed between the central portion 31 and the Umlaufwandung 33.
  • the central portion 31 is connected to the Umlaufwandung 33 via a Abstimmelementboden 36.
  • the housing bottom 20 opposite the front end of the threaded bushing 40 is in the distance space 35th received between the central portion 31 and the peripheral wall 33 of the Abstimmelements 30.
  • the Umlaufwandung 33 is disposed between the sleeve 40 and the wall of the inner conductor tube 10.
  • the tuning element 30 is formed of a dielectric material or a dielectric, such as a plastic, occur at the contact point of the external thread 32 with the internal thread 41 no intermodulation problems. By turning the Abstimmelements 30 in the threaded bushing 40 no metal abrasion, which could lead to an intermodulation problem.
  • the tuning element 30 may consist, for example, of a dielectric material such as plastic, that is, including the external thread 32, there can be no current transition to the socket which is made of an electrically conductive material with the associated internal thread 41.
  • the tuning element 30 in its outer cladding region consists of a dielectric material, so that the entire threads are formed of a dielectric material, so that there is no current transfer with the metal or one with a metallic layer coated internal thread of the sleeve 40 can take place.
  • the axial core in a smaller diameter than the outer diameter of the Abstimmelements 30 also made of metal, since this metal can nowhere contact with the surface of the internal thread 32 of the threaded bushing 40.
  • the tuning element 30 may consist wholly or partly of a dielectric material so far, but also the threaded bushing.
  • each made of dielectric material also leads to the fact that no current transitions can take place in the region of the threaded threaded engagement.
  • the circumferential wall 33 which is arranged between the inner conductor 10 and the threaded bushing 40, is an overvoltage protection of the resonator 1.
  • the maximum field strength occurs at the open end 11 of the inner conductor 10.
  • the risk of rollover increases from the inner conductor 10 to the threaded bushing 40. This risk of rollover is considerably reduced by the peripheral wall 33 of the Abstimmelements 30.
  • the circumferential wall 33 of the Abstimmelements 30 has a so-called peripheral edge 34.
  • the wall thickness of the peripheral wall 33 is smaller than the wall thickness of the peripheral wall below the peripheral edge 34 above the peripheral edge 34.
  • the edge 34 faces the threaded bushing 40. However, it is also possible that this edge 34 faces the inner wall of the inner conductor 10.
  • Fig. 12 is a high-frequency filter according to the second embodiment of the present invention.
  • the construction of in FIG. 2 shown high frequency filter is identical to the in FIG. 1 shown high-frequency filter, with the only difference that the tuning element 30 further comprises a circumferential collar 37 which is connected to the housing cover 22 opposite the front end of the Umlaufwandung 33 and radially directed away from the central portion 31.
  • This collar 37 has a further reduction of the risk of rollovers. Because the collar 37 is positioned above the free end 11 of the inner conductor 10, so that the collar 37 is disposed between the free end 11 and the inner wall of the housing cover 22. Thus, a flashover between the inner conductor 10 and the housing cover 22 is also reliably prevented.
  • the housing bottom 20, the housing wall 24 and the inner conductor 10 are usually made of a metal, i. of a first material having a first thermal expansion coefficient. It is also possible that the housing wall 24 consists of a first material exhibiting a first thermal expansion coefficient and the inner conductor 10 consists of a second material exhibiting a second thermal expansion coefficient.
  • the tuning element may be made of a plastic, i. consist of a third material having a third coefficient of thermal expansion. The third thermal expansion coefficient of the plastic is greater than the first thermal expansion coefficient of the first material and / or greater than the second thermal expansion coefficient of the second material.
  • the tuning element contracts in the axial direction more than the inner conductor 10 and the housing wall 24, whereby a smaller proportion of the Umlaufwandung above the peripheral edge between the inner conductor 10 and the sleeve 40 is located, which in turn has the consequence that more dielectric material is located between the inner conductor 10 and the socket 40. This increases the head capacity of the resonator.
  • the outer conductor housing may be formed of, for example, aluminum, brass, invar steel, cast aluminum or Arnite plastic with glass fiber. From selbigen materials and the housing cover 22 may be formed. Likewise, the housing may be made with the inner conductor, the housing bottom and the housing cover of a dielectric material, which is coated with an electrically conductive layer. Usually, the electrically conductive layer is attached to the lid on the inside, so that at the junction between the housing cover and peripheral housing walls of the outer conductor housing a full-surface galvanic contact is ensured.
  • This electrically conductive layer can also be provided in the region of the bushing 40 and thereby cover the internal thread 41 of the threaded bush 40, so that the internal thread is in turn electrically conductive on its surface.
  • the tuning element may for example be formed from acrylonitrile-butadiene-styrene (ABS plastic).
  • the inner conductor may be formed of the same materials as the outer conductor housing.
  • the threaded bushing 40 may optionally be attached to the housing cover at different heights. It has proven to be advantageous if the height H, ie the axial length H of the threaded bushing 40 in relation to the inner diameter D of the threaded bushing 40 has a dimension which is ⁇ 1.5, preferably ⁇ 1.6, 1.7, 1.8, 1.9, 2.0 or even 2.25, 2.5, 2.75, 3.0 and / or more. In general, however, it is sufficient if these values are not greater than 2.0 or 2.5 or even 3.0. In all cases, it is ensured that the overall housing is optimally shielded to the outside and no electromagnetic radiation can escape or enter.

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

Claims (8)

  1. Filtre à haute fréquence à structure coaxiale, le filtre à haute fréquence présentant les particularités suivantes :
    - le filtre à haute fréquence comprend au moins un résonateur (1) comportant un conducteur interne (10) et un boîtier de conducteur externe (24') ;
    - le boîtier de conducteur externe (24') comprend un fond de boîtier (20), un couvercle de boîtier (22) espacé du fond de boîtier (20) et une paroi de boîtier (24) périphérique entre le fond de boîtier (20) et le couvercle de boîtier (22) ;
    - le conducteur interne (10) est connecté galvaniquement au fond de boîtier (20) et s'étend dans la direction axiale depuis le fond de boîtier (20) en direction du couvercle de boîtier (22) ;
    - le conducteur interne (10) se termine à une certaine distance du couvercle de boîtier (22) et/ou est séparé galvaniquement du couvercle de boîtier (22) ;
    - le résonateur (1) comprend un élément d'ajustement (30) qui est disposé en face du conducteur interne (10), qui est maintenu au moins indirectement dans le couvercle de boîtier (22) d'une manière lui permettant de changer de position axiale et qui fait saillie dans l'espace interne du résonateur ;
    - le conducteur interne (10) présente un évidement longitudinal (12) qui s'étend en direction du fond de boîtier (20) à partir de l'extrémité frontale du conducteur interne (10) tournée vers le couvercle de boîtier (22) ;
    - l'élément d'ajustement (30) est insérable dans l'évidement longitudinal (12) du conducteur interne (10) ;
    - dans le couvercle de boîtier (22) ou dans une douille (40) prévue dans le couvercle de boîtier (22) et reliée au couvercle de boîtier (22), il est constitué un filetage interne (41) dans lequel l'élément d'ajustement (30) pourvu d'un filetage externe (32) est disposé de manière à pouvoir tourner ;
    - l'élément d'ajustement (30) est réalisé dans un matériau diélectrique de manière à éviter les passages de courant entre le filetage externe (32) et le filetage interne (41) ; et
    - l'élément d'ajustement (30) présente une partie centrale (31) au moyen de laquelle l'élément d'ajustement (30) est maintenu d'une manière lui permettant de changer de position ;
    caractérisé par les particularités supplémentaires suivantes :
    - l'élément d'ajustement (30) présente en outre une paroi périphérique (33), l'élément d'ajustement (30) et la paroi périphérique (33) étant séparés l'un de l'autre par un évidement (35) entourant la partie centrale (31), si bien qu'il est formé un espace de dégagement (35) entre la partie centrale (31) et la paroi périphérique (33), ladite partie centrale (31) et ladite paroi périphérique (33) étant reliées l'une à l'autre par un fond d'élément d'ajustement (36) ; et
    - l'extrémité frontale de la douille (40) tournée vers le fond de boîtier (20) peut être reçue ou pénétrer dans l'évidement (35) séparant la partie centrale (31) et la paroi périphérique (33) de l'élément d'ajustement (30) de telle manière que la paroi périphérique (33) est située entre la douille (40) et le conducteur interne (10) au sein de son évidement longitudinal (12).
  2. Filtre à haute fréquence selon la revendication 1, caractérisé par la caractéristique suivante :
    - le couvercle de boîtier (22) comprend une douille (40) qui est reliée galvaniquement au couvercle de boîtier (22) et qui s'étend vers le fond de boîtier (20).
  3. Filtre à haute fréquence selon la revendication 1 ou 2, caractérisé par les particularités suivantes :
    - la douille (40) se termine à la hauteur de l'extrémité frontale du conducteur interne (10) ou pénètre dans l'évidement longitudinal (12) du conducteur interne (10) ; et
    - l'élément d'ajustement (30) ressort de l'extrémité frontale de la douille (40) tournée vers le fond de boîtier (20) et pénètre ainsi encore davantage dans l'évidement longitudinal (12) du conducteur interne (10).
  4. Filtre à haute fréquence selon l'une des revendications 1 à 3, caractérisé en ce que la paroi périphérique (33) de l'élément d'ajustement (30) présente un bord marginal (34) de telle sorte que la paroi périphérique (33) présente une épaisseur de paroi plus mince au-dessus du bord marginal (34) qu'au-dessous du bord marginal (34).
  5. Filtre à haute fréquence selon l'une des revendications 1 à 4, caractérisé en ce que l'élément d'ajustement (30) comprend en outre une collerette (37) entourant l'élément d'ajustement (30) et reliée à l'extrémité frontale, tournée vers le couvercle de boîtier (22), de la paroi périphérique (33) en s'étendant dans une direction s'écartant radialement de la partie centrale (31).
  6. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé par les particularités suivantes :
    - la paroi de boîtier (24) et le conducteur interne (10) se composent d'un premier matériau présentant un premier coefficient de dilatation thermique ou bien la paroi de boîtier (24) se compose d'un premier matériau présentant un premier coefficient de dilatation thermique et le conducteur interne (10) se compose d'un deuxième matériau présentant un deuxième coefficient de dilatation thermique ;
    - l'élément d'ajustement (30) se compose d'un troisième matériau présentant un troisième coefficient de dilatation thermique ; et
    - le troisième coefficient de dilatation thermique du troisième matériau est supérieur au premier coefficient de dilatation thermique du premier matériau et/ou supérieur au deuxième coefficient de dilatation thermique du deuxième matériau.
  7. Filtre à haute fréquence selon la revendication 6, à condition que celui-ci dépende de la revendication 6, caractérisé par les particularités suivantes :
    - lors d'une hausse de température, l'élément d'ajustement (30) s'étend dans sa direction axiale davantage que ne le font le conducteur interne (10) et la paroi de boîtier (24), si bien qu'une plus grande partie de la paroi périphérique (33) est située au-dessus du bord marginal (34) entre le conducteur interne (10) et la douille (40), une moindre quantité de matériau diélectrique se trouvant ainsi entre le conducteur interne (10) et la douille (40), moyennant quoi la capacité au sommet du résonateur (1) se réduit ; et
    - lors d'une réduction de température, l'élément d'ajustement (30) se contracte dans la direction axiale davantage que ne le font le conducteur interne (10) et la paroi de boîtier (24), si bien qu'une plus petite partie de la paroi périphérique (33) est située au-dessus du bord marginal (34) entre le conducteur interne (10) et la douille (40), une plus grande quantité de matériau diélectrique se situe ainsi entre le conducteur interne (10) et la douille (40), moyennant quoi la capacité au sommet du résonateur (1) augmente.
  8. Filtre à haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le rapport entre la hauteur axiale ou la longueur (H) de la douille (40) et le diamètre (D) de la douille (40) présente une valeur ≥ 1,5, notamment ≥ 1,6, 1,7, 1,8, 1,9, 2,0, 2,25, 2,5, 2,75 et/ou ≥ 3,0.
EP13782980.0A 2012-10-25 2013-10-24 Filtre réglable à haute fréquence Active EP2912714B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012020979.7A DE102012020979A1 (de) 2012-10-25 2012-10-25 Abstimmbares Hochfrequenzfilter
PCT/EP2013/003226 WO2014063829A1 (fr) 2012-10-25 2013-10-24 Filtre haute fréquence accordable

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EP2912714A1 EP2912714A1 (fr) 2015-09-02
EP2912714B1 true EP2912714B1 (fr) 2017-11-01

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US (1) US9748622B2 (fr)
EP (1) EP2912714B1 (fr)
KR (1) KR101720261B1 (fr)
CN (1) CN104838537B (fr)
CA (1) CA2886911A1 (fr)
DE (1) DE102012020979A1 (fr)
WO (1) WO2014063829A1 (fr)

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US9490766B2 (en) * 2014-02-13 2016-11-08 Ut-Battelle, Llc Shielded multi-stage EMI noise filter
KR101693214B1 (ko) * 2014-10-28 2017-01-05 주식회사 케이엠더블유 캐비티 구조를 가진 무선 주파수 필터
DE102015008894A1 (de) 2015-07-09 2017-01-12 Kathrein-Werke Kg Gewindelose Abstimmelemente für Koaxialresonatoren und Verfahren zur Abstimmung derselben
US10050323B2 (en) * 2015-11-13 2018-08-14 Commscope Italy S.R.L. Filter assemblies, tuning elements and method of tuning a filter
CN109891216A (zh) * 2016-04-12 2019-06-14 镜元科技股份有限公司 大光圈太赫兹-吉赫兹镜片系统
WO2019127496A1 (fr) * 2017-12-29 2019-07-04 华为技术有限公司 Filtre à cavité
US11139545B2 (en) * 2019-07-31 2021-10-05 Nokia Shanghai Bell Co., Ltd. Dielectric tuning element
CN111211395B (zh) * 2020-01-20 2022-05-17 江苏宝利金材科技有限公司 一种高分子复合材料腔体滤波器的制备方法
CN113131117B (zh) * 2021-04-16 2022-04-15 西安电子科技大学 一种应用于腔体滤波器的温度补偿螺钉
EP4239786A1 (fr) * 2022-03-03 2023-09-06 Nokia Solutions and Networks Oy Filtre à fréquence réglable

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Publication number Publication date
CN104838537A (zh) 2015-08-12
KR101720261B1 (ko) 2017-04-10
CN104838537B (zh) 2017-09-26
KR20150079832A (ko) 2015-07-08
DE102012020979A1 (de) 2014-04-30
EP2912714A1 (fr) 2015-09-02
US9748622B2 (en) 2017-08-29
CA2886911A1 (fr) 2014-05-01
WO2014063829A1 (fr) 2014-05-01
US20150288043A1 (en) 2015-10-08

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