EP3430673A1 - Filtre rf - Google Patents

Filtre rf

Info

Publication number
EP3430673A1
EP3430673A1 EP17729173.9A EP17729173A EP3430673A1 EP 3430673 A1 EP3430673 A1 EP 3430673A1 EP 17729173 A EP17729173 A EP 17729173A EP 3430673 A1 EP3430673 A1 EP 3430673A1
Authority
EP
European Patent Office
Prior art keywords
filter
wall
transmission line
bent
supporting bracket
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.)
Withdrawn
Application number
EP17729173.9A
Other languages
German (de)
English (en)
Inventor
Janne PENTTILÄ
Tero Kämäräinen
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.)
Tongyu Technology Oy
Original Assignee
Tongyu Tech Oy
Tongyu Technology Oy
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 Tongyu Tech Oy, Tongyu Technology Oy filed Critical Tongyu Tech Oy
Publication of EP3430673A1 publication Critical patent/EP3430673A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters

Definitions

  • the invention relates to an RF filter.
  • RF filters i.e. radio frequency filters
  • RF devices such as transmitters, receivers or transceivers, in particular in the amplifiers therein, in base stations of mobile phone networks, for example.
  • Resonator type filters comprise a casing structure with one or more compartments whose shape is defined by the wall structure of the casing.
  • a compartment of the casing structure may contain an inner conductor, referred to as a resonator or a resonator rod, attached to the bottom of the compartment or cavity, a common structure being a coaxial resonator in which the inner conductor, or the resonator, shares a common axis, i.e. is coaxial, with the surrounding compartment or cavity.
  • a compartment in a metal casing and a metal inner conductor in the casing together form a resonant circuit.
  • the casing structure consists of plural compartments, each compartment having a separate inner conductor, or resonator, whereby a plural number of resonant circuits is formed and, with a suitable intercoupling of these, desired frequency responses, i.e. stopbands and passbands, are obtained.
  • a transmission line may be used, which brings an RF signal to adjacent compartments of the filter from a signal port or a similar connector mounted at an end of the compartment structure.
  • the transmission line in question needs to be attached to something, and it is known to use a vertical supporting arm fixed to the bottom of the filter casing, and it is additionally known to make use of a projection cast on the wall of the casing structure at its manufacturing stage as a support for the transmission line.
  • the structures in question undoubtedly make it possible to support the transmission line, that is, its mounting, but from the point of view of manufacturing them or assembling the filter, they are laborious.
  • An object of the invention is thus to provide an RF filter so as to solve or alleviate the aforementioned problems.
  • the object of the invention is achieved by an RF filter which is characterised by what is disclosed in the independent claim. Preferred embodiments of the invention are disclosed in the dependent claims.
  • the benefit of the invention is the accomplishment of a reliable mounting point or a support point for a transmission line in a manner easy to manufacture.
  • Figure 1 is a top view of an RF filter as seen from the direction of the cover of the casing
  • Figure 2 is a side view of an RF filter as seen from the direction of the frontmost long side of the casing
  • Figure 3 is a front diagonal view of the filter without the cover and frontmost side
  • Figure 4 shows the filter of Figure 3 with the cover and frontmost side
  • Figure 5 shows a separating wall of the casing with a bent supporting bracket.
  • an RF filter F is disclosed, which filter F may be used in connection with or coupled to an RF device, such as a transmitter, a receiver, a transceiver or an amplifier.
  • the RF device may be a radio unit in a cellular radio network or a module thereof, for example.
  • the filter F has signal ports SP1 , SP2, to which a connection may be made by cables that connect the filter F to an antenna and, for example, a transceiver.
  • the short cables shown in Figure 3 by the signal ports SP1 , SP2 may connect the filter to coaxial connectors mounted on the walls of the outer casing (not shown) surrounding it.
  • the filter comprises a casing structure C which has a wall structure W and under it, a bottom B, and on top of it, a cover T.
  • the casing structure C that is, its wall structure W, bottom B, and cover T, is of conductive metal, such as copper or aluminium coated with, for example, silver or another material that improves conductivity.
  • the RF filter shown in the figures is a coaxial resonator filter, in other words, it has one or more compartments CPA1 -CPA4 and in them correspondingly compartment-specific inner conductors R1 -R4 or resonators, that is, resonator rods which are rectilinear, that is, coaxial with the direction in which the compartment of the casing C extends, so they extend in the perpendicular direction between the cover and bottom.
  • Each compartment CPA1 - CPA4 of the casing together with its resonator R1 -R4 forms a resonator circuit, and adjacent resonator circuits together form a filter with the desired attenuation graph.
  • the filter may be a bandpass filter, for example.
  • the resonators R1 -R4 are fixed to the bottom B of the casing C with screws.
  • the bottom ends of the resonators R1 -R4, i.e. the bottom parts of the resonators in Figure 1 are short-circuited to the bottom B of the of the casing C, the bottom acting at the same time as a common ground for the resonators R1 -R4.
  • the top parts of the resonators R1 -R4 are so- called free ends, which are galvanically isolated from the casing C, particularly from the cover T of the casing.
  • the length of the resonators is approximately a quarter wavelength.
  • the wall structure comprised by the casing C which is thus between the bottom B and the cover T, comprises sides S1 -S2, ends E1 -E2, and separating walls W1 -W3 between the compartments.
  • a four- compartment casing structure has three separating walls W1 , W2, W3 between the compartments CPA1 , CPA2, CPA3, CPA4, the role of the separating walls being to separate the compartments and consequently the resonance circuits from one another by preventing excessive capacitive coupling between the free ends of the resonators R1 -R4.
  • the frontmost long side S2 of the wall structure W of the casing C is closest to the viewer, so the structures seen behind the side S2 are illustrated by a dotted line.
  • the filter comprises a signal port SP1 at an end E1 of the casing, and an RF transmission line TL connected to the signal port in question, the RF transmission line TL being arranged to transfer an RF signal to compartments CPA1 - CPA4 of the RF filter.
  • the filter comprises a second signal port SP2.
  • the signal port SP1 may be connected to an RX/TX device, that is, a transceiver, in particular to the amplifier included therein.
  • the signal port SP2 may be connected to an antenna cable.
  • the other end of the transmission line that is, the right-hand side end in Figure 3, is connected to the second signal port SP2.
  • the transmission line TL is supported to the wall structure of the casing C.
  • the wall structure of the casing C comprises a supporting bracket SU1 -SU4 which is bent from a wall of the wall structure W and to which the transmission line TL is fixed by means of an insulating mounting IS1 -IS4.
  • Figure 3 shows supporting brackets SU1 -SU4 bent from a wall, which are for projection branches TL1 -TL4 that branch off from the main line ML of the transmission line TL.
  • a supporting bracket such as SU1 -SU4 bent from a wall is a supporting bracket for supporting the free end of a projection branch SU1 -SU4 branching off from the main line of the transmission line, because the free end of the projection branch is the most susceptible to vibration, which might result in a change in the frequency response of the filter.
  • the bent supporting bracket SU4 is for the most part invisible behind the projection branch TL4 of the transmission line TL.
  • the supporting brackets SU1 1 -SU13 bent from a wall are for supporting the main line ML of the transmission line TL.
  • the transmission line TL in particular its main line ML, is fixed to the bent supporting brackets SU1 1 - SU13 in question by means of an insulating mounting IS1 1 -IS13.
  • the projection branches TL1 -TL4 that extend closer to the resonators R1 -R4 from the main line ML of the transmission line TL may be considered as coupling projections by means of which the capacitive coupling between the resonators R1 -R4 and the transmission line TL takes place.
  • the projection branches TL1 -TL4 of the transmission line TL comprise coupling parts CP1 -CP4, which may be, for example, bendable plate surfaces, but other shapes, too, are possible.
  • the intensity of the coupling between the resonators R1 -R4 and the transmission line TL is affected by the size of the coupling parts CP1 -CP4 and their distance from the resonator.
  • the coupling parts CP1 -CP4 are best seen in Figure 3.
  • the coupling parts CP1 -CP4 in the coupling branches are not in a conducting or galvanic contact to the resonators or the casing C of the filter, that is, its body.
  • a supporting bracket such as SU3, bent from a wall is at an edge of the wall, because it is there where it may more easily be formed than more to the middle of the wall.
  • the supporting bracket bent from a wall is so positioned on the wall W3 that it is in the vicinity of the resonator cover B at the top part of the compartment, such as at the top part of the compartment CPA3.
  • the supporting bracket, such as SU3, bent from the wall is at the free end, in other words the capacitive end of a resonator, such as R3, located at a distance from the cover B, causing the transmission line TL to be placed in the same area.
  • a supporting bracket such as SU2 bent from the wall, is on the separating wall W1 between the compartments, such as CPA1 , CPA2, of the RF filter.
  • the supporting bracket SU3 bent from the wall is on the separating wall W3 between the compartments CPA3, CPA4 of the RF filter.
  • the supporting bracket SU1 1 bent from the wall is on the separating wall W1 between the compartments CPA2, CPA3 of the filter.
  • the supporting bracket SU12 bent from the wall is on the separating wall W2 between the compartments CPA3, CPA4 of the filter.
  • the supporting bracket SU13 bent form a wall is on the separating wall W3 between the compartments CPA3, CPA4 of the filter.
  • the same wall such as W1 , W3, has at least two bent supporting brackets for the transmission line TL.
  • the same wall, such as separating wall W1 , W3 has a bent supporting bracket for both the main line ML of the transmission line, and a projection branch, such as TL2, TL3, branching off from the main line.
  • a wall, such as the separating wall W1 has a bent supporting bracket SU2 for the projection branch TL2 of the transmission line, and a bent supporting bracket SU1 1 for the main line ML of the transmission line TL.
  • a wall, such as the separating wall W3 has a bent supporting bracket SU3 for the projection branch TL3 of the transmission line, and a bent supporting bracket SU13 for the main line ML of the transmission line TL.
  • the supporting brackets such as SU3, it is easiest to bend the supporting brackets, such as SU3, to the separating wall piece before installing the separating wall piece in place between the long sides S1 , S2 of the casing C.
  • a plate piece to become the separating wall W3 has been provided with grooves determined by the width of the supporting bracket SU3, due to which the supporting bracket can be bent.
  • the supporting bracket is bent into a substantially right angle, that is, approximately a 90 degree angle with respect to the plane of the separating wall piece surface. It is advantageous for the surface plane of the supporting bracket SU3 to be parallel to the transmission line TL, in which case fixing by the insulating mounting IS3 will be easiest.
  • the isolating mounting IS1 -IS4, IS1 1 -IS13 may be a plastic screw, for example, for which the supporting bracket has a threaded receptacle THR or a similar counterpart.
  • the casing C with its structural elements B, T, W, W1 -W3 is of conductive metal, such as copper or aluminium coated with silver, for example.
  • the thickness of the wall is preferably at least 0.5 mm, most preferably at least 1 mm.

Landscapes

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

Abstract

L'invention concerne un filtre RF comprenant un boîtier (C), une structure de paroi (W) entre un fond (B) et un couvercle (T) à l'intérieur de laquelle au moins un compartiment (CPA1-CPA4) est défini. Le filtre RF a des résonateurs spécifiques de compartiment (R1-R4), et le filtre RF comprend un port de signal (SP1) et une ligne de transmission RF (TL) qui y sont connectés, la ligne de transmission RF étant agencée pour transférer un signal RF aux compartiments (CPA1-CPA4) du filtre RF. Pour supporter la ligne de transmission RF, la structure de paroi (W) du boîtier (C) comprend un ou plusieurs supports d'appui (SU1-SU4, SU11-SU13) qui sont pliés à partir d'une paroi de la structure de paroi et auxquels la ligne de transmission (TL) est fixée au moyen d'un support isolant (IS).
EP17729173.9A 2016-03-18 2017-03-17 Filtre rf Withdrawn EP3430673A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610157297.1A CN107204503B (zh) 2016-03-18 2016-03-18 Rf滤波器
PCT/FI2017/050179 WO2017158241A1 (fr) 2016-03-18 2017-03-17 Filtre rf

Publications (1)

Publication Number Publication Date
EP3430673A1 true EP3430673A1 (fr) 2019-01-23

Family

ID=59034803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17729173.9A Withdrawn EP3430673A1 (fr) 2016-03-18 2017-03-17 Filtre rf

Country Status (3)

Country Link
EP (1) EP3430673A1 (fr)
CN (1) CN107204503B (fr)
WO (1) WO2017158241A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111384547B (zh) * 2018-12-29 2022-07-12 大富科技(安徽)股份有限公司 一种应用于5g通信系统的滤波器及通信设备
CN110729539A (zh) * 2019-10-28 2020-01-24 深圳市国人射频通信有限公司 一种腔体滤波器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661998A (en) * 1983-09-22 1987-04-28 Matsushita Electric Industrial Co. Ltd. Double superheterodyne tuner
FI119207B (fi) * 2003-03-18 2008-08-29 Filtronic Comtek Oy Koaksiaaliresonaattorisuodatin
FI121514B (fi) * 2004-05-12 2010-12-15 Filtronic Comtek Oy Kaistanestosuodatin
EP2099091B1 (fr) * 2008-03-04 2017-11-22 HMD global Oy Filtre de bande de fréquence radio variable
JP6006079B2 (ja) * 2012-10-23 2016-10-12 Ｎｅｃエンジニアリング株式会社 チューナブル帯域通過フィルタ
EP3014696A2 (fr) * 2013-06-25 2016-05-04 Intel Corporation Agencement de couplage entre résonateurs de filtre à cavité
FI127786B (fi) * 2015-07-20 2019-02-28 Prism Microwave Oy Menetelmä RF-suodattimen rakenneosan valmistamiseksi, rakenneosa ja RF-suodatin

Also Published As

Publication number Publication date
WO2017158241A1 (fr) 2017-09-21
CN107204503A (zh) 2017-09-26
CN107204503B (zh) 2020-05-05

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