EP3311445B1 - Filtre à cavité radiofréquence (rf) accordable - Google Patents

Filtre à cavité radiofréquence (rf) accordable Download PDF

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Publication number
EP3311445B1
EP3311445B1 EP16728038.7A EP16728038A EP3311445B1 EP 3311445 B1 EP3311445 B1 EP 3311445B1 EP 16728038 A EP16728038 A EP 16728038A EP 3311445 B1 EP3311445 B1 EP 3311445B1
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EP
European Patent Office
Prior art keywords
cavity
cavity body
filter
socket
tuning element
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
EP16728038.7A
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German (de)
English (en)
Other versions
EP3311445A1 (fr
Inventor
Mikael RITSCHER
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.)
Kaelus AB
Original Assignee
Microdata Telecom Innovation Stockholm AB
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Publication date
Application filed by Microdata Telecom Innovation Stockholm AB filed Critical Microdata Telecom Innovation Stockholm AB
Publication of EP3311445A1 publication Critical patent/EP3311445A1/fr
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • the present disclosure relates to tunable radio frequency (RF) cavity filters.
  • Tunable radio frequency (RF) cavity filters also referred to as tunable radio frequency (RF) cavity resonator filters
  • RF cavity resonator filters are widely used in engineering for filtering, e.g. combiners, splitters and filters in telecommunication applications. They are typically based on a component referred to as RF cavity resonator, or just cavity resonator, comprising a cavity body.
  • the filters are generally designed by combining a plurality of coupled cavity resonators, where each cavity resonator is tuned to a particular frequency to achieve a combined filter characteristic, and is typically enclosed in a chassis.
  • a cavity resonator can be tuned to a given frequency or given frequencies by changing the volume of the cavity body comprised in the cavity resonator, e.g.
  • the cavity resonators within the chassis are coupled to each other and will interact to form a resulting filter characteristic acting on an input signal to generate an output signal.
  • the coupling between coupled cavity resonators can be controlled or regulated, e.g. by changing the relative distance between them or by introducing coupling elements between pairs of cavity resonators.
  • EP1987563 relates to a cavity filter comprising at least one tuning conductor presenting a hollow portion, an isolation device for a tuning conductor of a cavity filter, and a node in a mobile communications network, comprising a cavity filter.
  • the tuning conductor comprises an isolation device in a non-conductive material, which isolation device is at least partly inserted into the hollow portion, and an insertion element in a conductive material presenting a male thread that is engaged with an inner surface of the isolation device.
  • the insertion element presents a male thread that is engaged with an inner surface of the isolation device. Since the isolation device is made of plastic, the male thread may damage the inner surface of the isolation device during tuning and retuning of the cavity filter, so that the engaging of the insertion element with the isolation device may become less exact. If this happens, the isolation device should be replaced, so that an exact tuning of the cavity filter remains possible. However, in order to replace the isolation device of EP1987563 , the filter chassis must be opened, since the isolation device and the insertion element are inserted from the inside of the filter chassis.
  • One of the objects of the present disclosure is to solve or at least minimize the problems mentioned above. This is achieved by the tunable radio frequency (RF) cavity filter as defined in the claims.
  • RF radio frequency
  • a radio frequency (RF) cavity filter comprising a housing enclosing at least one radio frequency (RF) cavity resonator.
  • Each radio frequency (RF) cavity resonator comprises: a cavity body having a cavity body axis and an at least partly conical inner wall around a cavity hole, wherein the cavity body is arranged so that its inner wall is accessible from the outside of the housing; a dielectric socket comprising a lining member, wherein the lining member is arranged within the cavity body so that it lines at least a part of the inner wall of the cavity body and is exchangeable from the outside of the housing, wherein the dielectric socket comprises an axial lock member arranged to inhibit movement of the dielectric socket along the cavity body axis; and a tuning element, arranged within the dielectric socket so that galvanic insulation between the inner wall and the tuning element is obtained and generation of passive inter-modulation is reduced.
  • the tuning element is arranged to be accessible from the outside of the housing so that its position along the cavity body axis can be adjusted, whereby the radio frequency (RF) cavity filter is tuned to frequencies dependent on the position of the tuning element along the cavity body axis.
  • RF radio frequency
  • Embodiments of the present disclosure may have at least the advantage of reducing PIM in a tunable radio frequency (RF) cavity filter.
  • the lining member is plastically deformable and arranged to plastically deform when receiving the tuning element, such that threads in the lining member are formed when the tuning element changes position along the cavity body axis in response to a rotational movement of the tuning element.
  • An advantage of embodiments of the present disclosure may be that production time is significantly reduced by eliminating the need to thread a large number of holes in the chassis or the chassis lid, this also reduces the percentage of throw-away components such as the chassis or chassis lid. Yet an advantage is to reduce the risk for increased PIM during the lifespan of the filter, especially when retuning the filter, as the risk of further metal flakes or shavings being released from the threads and falling into the filter is eliminated. Yet another advantage of the present disclosure is that the dielectric socket, or at least the lining member, can easily be replaced, e.g. if the threads are damaged. Yet an advantage is that production time is reduced as the time consuming production step of reworking is eliminated, i.e. the need to open the filter again, clean the components inside, close the filter and retune the filter again.
  • the lining member is at least partly conical. This makes it easier to exchange the dielectric socket from the outside of the housing, since the dielectric socket may then not be held in place by any friction when the tuning element is removed and thus may fall out automatically when the housing is turned.
  • the lining member is continuous and lines the entire inner wall of the cavity body.
  • the lining member contains openings and only lines parts of the inner wall of the cavity body.
  • the whole dielectric socket is exchangeable from the outside of the housing.
  • the dielectric socket comprises a rotational lock member which is arranged to inhibit the socket from rotating.
  • the housing may comprise a recess for each cavity body, wherein the recess is arranged to receive the rotational lock member such that rotation of the socket around the cavity body axis is inhibited.
  • the socket may be designed with a relatively high level of friction between the tuning element and the dielectric socket without risking that the socket starts moving with the tuning element, e.g. in response to rotational movement of the tuning element.
  • Yet an advantage of embodiments of the present disclosure may be that the socket is prevented from falling out of the cavity body when handling the chassis.
  • the dielectric socket further comprises a friction member which is arranged to control the friction between the tuning element and the dielectric socket.
  • PIM Passive InterModulation
  • the tuning process of adjusting tuning elements requires both a tuning step and a locking step, e.g. fixating a tuning screw with a tuning screw locking nut.
  • the locking step is required as the tuned frequencies of the filter are extremely sensitive to a change in position of the tuning element. This increases the production time, the complexity of the tuning process, the construction of the filter and the level of PIM, e.g. as the galvanic contact between locking nut and chassis, or the galvanic contact between tuning screw and chassis, may vary with the tightening torque of the locking nut.
  • the cavity body 130 is elongated and hollow.
  • the cavity body axis 1303 is the longitudinal axis of the cavity body 130.
  • the cavity body 130 comprises an outer wall 1302 and an inner wall 1301, around a cavity hole 1107.
  • the cavity body 130 may be arranged so that its inner wall 1301 is accessible from the outside of the housing.
  • the cavity body 130 is attached to or integrated into to the chassis bottom at one end.
  • a cross section, orthogonal to the cavity body axis, of the cavity body 130 may be circular, oval, rectangular or quadratic or any other shape suitable for a cavity body 130.
  • pre-threaded holes for receiving tuning elements 150 may be eliminated, as threads in the socket are formed when the tuning element changes position along or parallel to the cavity body axis 1303 within the cavity body 130. Further, the cumbersome and time consuming production step of threading holes may be eliminated. Further, the percentage of throw-aways or discarded components can be reduced.
  • the friction member 1404 may be a hexagonal, octagonal or any other non-circular shaped inner wall of the socket lining member 1402 having a diameter smaller than the outer diameter of the tuning element 150, thereby providing friction between the tuning element 150 and the dielectric socket 140.
  • a cylindrical lining member 1402 may be continuous or contain openings and be manufactured from one part or several detachable parts. The same applies to a conical lining member 1402. All conceivable lining members 1402 may be used together with conical inner walls 1301.
  • the recess 1106 having a shape corresponding to the shape of the rotational lock member 1401, allowing the rotational lock member 1401 to slide into the recess 1106 with a tight fit, thus inhibiting rotational movement of the dielectric socket 140.
  • the outline shape of the recess 1106 matches or corresponds to the outline shape of the rotational lock member 1401.
  • the socket hole may be arranged to receive the lining member 1402 when it protrudes through the socket hole 1107.
  • Fig. 5 shows a cavity body 130 pair and a coupling element 160, in accordance with one or more embodiments of the disclosure.
  • PIM levels in the radio frequency (RF) cavity filter 100 may be further reduced by introducing PIM improved tunable coupling elements 160 between a pair of cavity resonators 120.
  • the filter 100 may comprise at least one cavity resonator coupling element 1101, 160 arranged between a cavity resonator 120 pair.
  • the coupling element 160 may be tunable.
  • the coupling element 1101 may be fixed, such as an inner wall 1101 of the chassis 110.
  • the dielectric rod 1601 may further be arranged to hold the attenuating member 1602.
  • the attenuating member 1602 may be arranged to be attached to the rod in between the one end and the opposing end.
  • the attenuating member 1602 is arranged to vary the area exposed to the cavity body 130 pair in response to a rotational movement to control or vary the coupling attenuation between cavity body 130 pairs.

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

Claims (13)

  1. Un filtre à cavité (100) radiofréquence (RF) comprenant un boîtier renfermant une pluralité de résonateurs à cavités (120) radiofréquence (RF), chaque résonateur à cavité (120) radiofréquence (RF) comprenant :
    un corps de cavité (130) ayant un axe (1303) de corps de cavité et une paroi intérieure (1301) au moins partiellement conique autour d'un trou de cavité (1107), le corps de cavité (130) étant agencé de sorte que sa paroi intérieure (1301) soit accessible depuis l'extérieur du boîtier ;
    une douille diélectrique (140) comprenant un élément de revêtement (1402), l'élément de revêtement (1402) étant agencé à l'intérieur du corps de cavité (130) de sorte qu'il recouvre au moins une partie de la paroi intérieure (1301) du corps de cavité (130) et est apte à être remplacé depuis l'extérieur du boîtier, la douille diélectrique (140) comprenant un élément de verrouillage axial (1403) agencé pour empêcher le déplacement de la douille diélectrique (140) selon l'axe (1303) du corps de cavité ; et
    un élément d'accordage (150), disposé à l'intérieur de la douille diélectrique (140) de manière à obtenir une isolation galvanique entre la paroi intérieure (1301) et l'élément d'accordage (150) et à réduire une génération d'intermodulation passive,
    l'élément d'accordage (150) étant agencé de façon à être accessible depuis l'extérieur du boîtier de sorte que sa position selon l'axe (1303) du corps de cavité soit réglable, de façon que le filtre à cavité (100) radiofréquence (RF) soit accordé à des fréquences dépendant de la position de l'élément d'accordage (150) selon l'axe (1303) du corps de cavité.
  2. Le filtre selon la revendication 1, dans lequel l'élément de revêtement (1402) est déformable plastiquement et agencé pour se déformer plastiquement lors de la réception de l'élément d'accordage (150), de sorte que des filets dans l'élément de revêtement (1402) sont formés lorsque l'élément d'accordage change de position selon l'axe du corps de cavité (1303) en réponse à un mouvement rotatif de l'élément d'accordage (150).
  3. Le filtre selon la revendication 1 ou la revendication 2, dans lequel l'élément de revêtement (1402) est également au moins partiellement conique.
  4. Le filtre selon l'une quelconque des revendications 1 à 3, dans lequel l'élément de revêtement (1402) est continu et recouvre toute la paroi intérieure (1301) du corps de cavité (130).
  5. Le filtre selon l'une quelconque des revendications 1 à 3, dans lequel l'élément de revêtement (1402) contient des ouvertures et ne recouvre que des parties de la paroi intérieure (1301) du corps de cavité (130).
  6. Le filtre selon l'une quelconque des revendications précédentes, dans lequel la totalité de la douille diélectrique (140) est interchangeable depuis l'extérieur du boîtier.
  7. Le filtre selon l'une quelconque des revendications précédentes, dans lequel la douille diélectrique (140) comprend un élément de verrouillage rotatif (1401) qui est agencé pour empêcher la rotation de la douille, et dans lequel le boîtier comprend un évidement (1106) pour chaque corps de cavité (130) qui est centré sur l'axe (1303) du corps de cavité de chaque corps de cavité (130), l'évidement étant agencé pour recevoir l'élément de verrouillage rotatif (1401) de telle sorte que la rotation de la douille (140) autour de l'axe (1303) du corps de cavité soit empêchée.
  8. Le filtre selon l'une quelconque des revendications précédentes, dans lequel la douille diélectrique (140) comprend un élément de friction (1404) qui est agencé pour commander la friction entre l'élément d'accordage (150) et la douille diélectrique (140).
  9. Le filtre selon l'une quelconque des revendications précédentes, dans lequel le boîtier comprend au moins un élément de liaison (1101, 160) entre au moins deux des résonateurs à cavités (120) radiofréquence (RF).
  10. Le filtre selon la revendication 9, dans lequel au moins l'un des éléments de liaison est un élément de liaison fixe (1101).
  11. Le filtre selon la revendication 10, dans lequel l'élément de liaison fixe est une paroi interne (1101) située dans le boîtier.
  12. Le filtre selon l'une quelconque des revendications 9 à 11, dans lequel au moins l'un des éléments de liaison est un élément de liaison accordable (160).
  13. Le filtre selon la revendication 12, dans lequel l'élément de liaison accordable (160) est configuré pour adapter la liaison entre des paires de résonateurs à cavité (120) à fréquence radio (RF) en réponse à un mouvement de rotation d'au moins une partie de l'élément de liaison accordable (160).
EP16728038.7A 2015-06-18 2016-06-10 Filtre à cavité radiofréquence (rf) accordable Active EP3311445B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1550851 2015-06-18
PCT/EP2016/063245 WO2016202687A1 (fr) 2015-06-18 2016-06-10 Filtre à cavité radiofréquence (rf) accordable

Publications (2)

Publication Number Publication Date
EP3311445A1 EP3311445A1 (fr) 2018-04-25
EP3311445B1 true EP3311445B1 (fr) 2019-09-11

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EP16728038.7A Active EP3311445B1 (fr) 2015-06-18 2016-06-10 Filtre à cavité radiofréquence (rf) accordable

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EP (1) EP3311445B1 (fr)
CN (1) CN208959338U (fr)
WO (1) WO2016202687A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201801232D0 (en) * 2018-01-25 2018-03-14 Radio Design Ltd Turntable filter and method of use thereof
WO2020110091A2 (fr) 2018-11-30 2020-06-04 Anthony Hooley Actionneur en alliage à mémoire de forme
WO2022067553A1 (fr) * 2020-09-29 2022-04-07 Telefonaktiebolaget Lm Ericsson (Publ) Unité de filtre, unité de filtre d'antenne et unité radio
KR102389873B1 (ko) * 2022-01-18 2022-04-25 (주)영텍 고성능 pimd를 위한 머시닝 가공된 필터

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3500078A (en) * 1977-04-21 1979-10-18 Del Technology Ltd Coaxial resonator tuning
US7078990B1 (en) * 2004-05-14 2006-07-18 Lockheed Martin Corporation RF cavity resonator with low passive inter-modulation tuning element
EP1596463A1 (fr) * 2004-05-15 2005-11-16 Spinner GmbH Elektrotechnische Fabrik Résonateur coaxial
US8330561B2 (en) * 2006-02-24 2012-12-11 Telefonaktiebolaget L M Ericsson (Publ) Cavity filter, an isolation device, and a node in a mobile communications network

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Publication number Publication date
EP3311445A1 (fr) 2018-04-25
CN208959338U (zh) 2019-06-11
WO2016202687A1 (fr) 2016-12-22

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