EP2814110B1 - Filtre de fréquence radio, procédé de filtrage de fréquence radio et procédé de construction dudit filtre - Google Patents

Filtre de fréquence radio, procédé de filtrage de fréquence radio et procédé de construction dudit filtre Download PDF

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Publication number
EP2814110B1
EP2814110B1 EP13290142.2A EP13290142A EP2814110B1 EP 2814110 B1 EP2814110 B1 EP 2814110B1 EP 13290142 A EP13290142 A EP 13290142A EP 2814110 B1 EP2814110 B1 EP 2814110B1
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EP
European Patent Office
Prior art keywords
lid
radio frequency
granular material
lip
granular
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
EP13290142.2A
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German (de)
English (en)
Other versions
EP2814110A1 (fr
Inventor
Efstratios Doumanis
Florian Pivit
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.)
Alcatel Lucent SAS
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Alcatel Lucent SAS
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Publication date
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Priority to EP13290142.2A priority Critical patent/EP2814110B1/fr
Publication of EP2814110A1 publication Critical patent/EP2814110A1/fr
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Publication of EP2814110B1 publication Critical patent/EP2814110B1/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

Definitions

  • the present invention relates to filters for telecommunications, in particular to radio frequency filters.
  • Radio frequency filters made up of air-filled cavity resonators are known. It is also known to include posts in the cavity resonators that are loaded with rings of a high dielectric material.
  • An example of the present invention is a radio frequency filter comprising at least one resonant chamber that comprises a cavity substantially filled by a granular material and has a lid, the granular material being a dielectric material or magnetic material, in which a layer of compressible foam material is provided between the lid and the granular material so as to apply a uniform pressure to the granular material.
  • the present invention also relates to a method of radio frequency filtering comprising passing a signal for filtering through at least one resonant chamber that comprises a cavity substantially filled by a granular material and has a lid, the granular material being a dielectric material or magnetic material, in which a layer of compressible foam material is provided between the lid and the granular material so as to apply a uniform pressure to the granular material.
  • the present invention also relates to a method of constructing the radio frequency filter comprising: constructing a lid and constructing a filter body comprising at least one cavity; selecting a granular material, the granular material being a dielectric material or magnetic material; filling said at least one cavity with the selected granular material; applying a layer of compressible material over the granular material; and putting the lid on over the layer of compressible material so as to apply uniform pressure to the granular material.
  • Preferred embodiments enable a density and packing of a powder or powder-like dielectric material in a filter cavity to be maintained and controlled. Preferred embodiments provide increased stability, uniformity and density in dielectric powder filled cavities.
  • Preferred embodiments enable uniform pressure to be applied to a powder or powder-like dielectric material within a metallic enclosure, specifically the cavity, so as to control the density of the dielectric material.
  • a small part of the cavity or a layer within the cavity is filled with an elastic, compressible and flexible material placed between the powder-filled cavity and the lid which is metallic.
  • the compressible material is preferably of low loss and has low impact on the resonating structure.
  • the lid which may be metallic is shaped and configured to fit the filter body so as to provide a uniform pressure to the granular material without the granular material being squeezed out.
  • Preferred embodiments are suitable for use in metrocell base stations and macrocell active antenna arrays.
  • Preferred embodiments allow uniform pressure to be applied to the granular material in such a way that its density may be controlled and stabilised. Preferred embodiments allow powders and powder-like materials to be used efficiently in filters and other radio frequency equipment.
  • the at least one chamber houses a respective resonator post and the chamber is substantially filled by the respective resonator post and the granular material.
  • radio frequency filters having resonant cavities of reduced size compared to air-filled resonant cavities by loading cavities with dielectric or magnetic powder.
  • the powder would fill the cavity practically irrespective of its shape or configuration.
  • the inventors realised that it would be useful to provide a way to control the density of the powder within the entire physical space that the powder dielectric material can occupy.
  • the inventors realised that it would be useful to control the density of the granular dielectric material by applying a uniform pressure to the material so as to have uniform density within the metal enclosure defining the cavity.
  • a Combline filter 2 is provided made up of a connected series of resonant cavities each filled with dielectric powder 6, having a dielectric constant for example in the range 2 to 10, in particular 3 to 5, and a low dielectric loss.
  • a powder may be of a dielectric constant of 3.8 and a loss tangent of 6 x 10 -5 ).
  • the filter 2 includes a first side wall 8 and a corresponding removable side wall denoted side lid 10, a base plate 12, a top plate 14, and end plates 16 that define the filter. There is also a series of partial inner walls 18 parallel to the end plates 16 that define a series of the resonant cavities 20. Each resonant cavity 20 has an input port (not shown) and an output port (not shown). Within each cavity 20 extending from the base plate 12 is a respective metal post 22.
  • each cavity 20 is filled with an elastic flexible and compressible material 24 placed between the powder filled cavity 20 and the side lid 10 which is metal or metallic. That compressible material 24 is low loss and because it is thin has low impact in terms of performance in radio frequency filtering.
  • the side lid 10 has a cut-away edge step 11 that runs along all four of its sides so that it has an edge portion 13 of less depth than the main body 15 of the side lid 10.
  • a corresponding lip 17 is provided that runs along the corresponding end walls 16, base plate 12 and top plate 14.
  • the step 11 and lip 17 are shaped and configured to fit.
  • the edge step 11 of the side lid 10 includes a surface 9 against which the inside surface 7 of the lip 17 can slide.
  • the lip 17 is configured such that when fastened together in use by screws 19 the edge portion 13 and lip 17 abut.
  • each cavity 20 is filled with the dielectric powder 6 and the compressible material 24, and the side lid is fitted thereto. As the side lid is put into position then fastened, the surface 9 of the side lid 10 slides against the inside surface 7 of the lip 17, so the dielectric powder is prevented from being squeezed out.
  • the compressible material 24 is Rohacell foam. Rohacell is understood to be a registered trademark associated with Evonik Industries AG. In an otherwise similar alternative example the compressible material is Neoprene.
  • the cavities 20 are filled with powder 6 and the compressible material 24 namely the Rohacell foam layer placed over. Doing this may be considered as overfilling the cavities.
  • the Rohacell foam layer is compressed, adjusting the total volume of the foam layer and providing even compression on the powder 6 that fills the cavities 20.
  • HFSS High Frequency Structure Simulator
  • the side lid 10" is flat rather than having edge steps.
  • the cavities 20" are filled with powder 6" and the compressible material 24" namely the Rohacell foam layer. Doing this may be considered as overfilling the cavities.
  • the Rohacell foam layer is compressed, adjusting the total volume of the foam layer and providing even compression on the powder 6" that fills the cavities 20".
  • each resonant cavity 20' there is a tuning screw 26 which is located in a hole 28 through the top plate 14 so as to be adjustable in distance from the top of the metal post 22'.
  • Each cavity 20' is filled with the powder 6' then a Rohacell layer 24' is applied and the top plate 14 secured in position.
  • the foam layer 24' is thereby compressed, adjusting the total volume of the foam layer and providing even compression on the powder 6' that fills the cavities 20'.
  • the foam layer 24' has holes 30 cut so as to correspond to the tuning screw positions, and it is through those holes that the tuning screws 26 may penetrate the foam layer 24'.
  • the present invention may be embodied in other specific forms without departing from its essential characteristics.
  • a granular magnetic material may be used instead of a granular dielectric material.

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

Claims (16)

  1. Filtre radiofréquence (2) comprenant au moins une chambre de résonance (20) qui comprend une cavité (20) essentiellement remplie d'un matériau granulaire (6) et comporte un couvercle (10), le matériau granulaire étant un matériau diélectrique ou un matériau magnétique, caractérisé en ce qu'une couche (24) de mousse compressible est disposée entre le couvercle et le matériau granulaire de façon à appliquer une pression uniforme sur le matériau granulaire.
  2. Filtre radiofréquence selon la revendication 1, dans lequel la mousse compressible (24) est une mousse de la gamme de mousses Rohacell.
  3. Filtre radiofréquence selon la revendication 1, dans lequel la mousse compressible est du Néoprène.
  4. Filtre radiofréquence selon l'une quelconque des revendications précédentes, dans lequel le couvercle (10) a un épaulement découpé au niveau du bord (11) qui s'étend le long de ses côtés de sorte que le couvercle a une partie du bord (13) de profondeur inférieure à celle de son corps principal (15), l'épaulement étant configuré pour s'adapter à une lèvre correspondante (17) qui s'étend le long des parois correspondantes du filtre.
  5. Filtre radiofréquence selon la revendication 4, dans lequel l'épaulement du bord (11) du couvercle (10) comporte une surface (9) contre laquelle la surface intérieure (7) de la lèvre (17) peut coulisser.
  6. Filtre radiofréquence selon la revendication 4 ou la revendication 5, dans lequel la lèvre (17) est configurée de sorte que lorsque le couvercle est fixé en position la partie du bord (13) et la lèvre (17) sont jointes bout à bout.
  7. Filtre radiofréquence selon l'une quelconque des revendications précédentes, dans lequel la ou les chambres (20) contiennent une tige résonnante (22) correspondante et la chambre est essentiellement remplie par la tige résonnante (22) correspondante et le matériau granulaire (6).
  8. Procédé de filtrage radiofréquence comprenant le passage d'un signal destiné à être filtré à travers au moins une chambre de résonance (20) qui comprend une cavité (20) essentiellement remplie d'un matériau granulaire (6) et comporte un couvercle (10), le matériau granulaire étant un matériau diélectrique ou un matériau magnétique, caractérisé en ce qu'une couche (24) de mousse compressible est disposée entre le couvercle et le matériau granulaire de façon à appliquer une pression uniforme sur le matériau granulaire.
  9. Procédé de filtrage radiofréquence selon la revendication 8, dans lequel la mousse compressible est une mousse de la gamme de mousses Rohacell.
  10. Procédé de filtrage radiofréquence selon la revendication 8, dans lequel la mousse compressible est du Néoprène.
  11. Procédé de filtrage radiofréquence selon l'une quelconque des revendications 8 à 10, dans lequel le couvercle (10) a un épaulement découpé au niveau du bord (11) qui s'étend le long de ses côtés de sorte que le couvercle a une partie du bord (13) de profondeur inférieure à celle de son corps principal (15), l'épaulement étant configuré pour s'adapter à une lèvre correspondante (17) qui s'étend le long des parois correspondantes du filtre.
  12. Procédé de filtrage radiofréquence selon l'une quelconque des revendications 8 à 11, dans lequel l'épaulement du bord (11) du couvercle (10) comporte une surface (9) contre laquelle la surface intérieure (7) de la lèvre (17) peut coulisser.
  13. Procédé de filtrage radiofréquence selon la revendication 11 ou la revendication 12, dans lequel la lèvre (17) est configurée de sorte que lorsque le couvercle est fixé en position la partie du bord (13) et la lèvre (17) sont jointes bout à bout, le couvercle ayant été enfoncé en position de sorte qu'une surface latérale (9) du couvercle (10) coulisse contre la surface intérieure (7) de la lèvre (17) s'étendant depuis le corps du filtre, de façon à éviter que le matériau granulaire diélectrique ne soit expulsé.
  14. Procédé de construction d'un filtre radiofréquence selon l'une quelconque des revendications 1 à 7 comprenant les étapes suivantes :
    construire le couvercle (10) et construire un corps de filtre (8, 12, 14, 16, 20) comprenant au moins une cavité (20) ;
    sélectionner le matériau granulaire (6), le matériau granulaire étant un matériau diélectrique ou un matériau magnétique ;
    remplir ladite ou lesdites cavités (20) avec le matériau granulaire sélectionné ;
    caractérisé par l'application de la couche (24) de mousse compressible sur le matériau granulaire ; et
    mettre le couvercle (10) par-dessus la couche de mousse compressible de façon à appliquer une pression uniforme sur le matériau granulaire.
  15. Procédé de construction d'un filtre radiofréquence selon la revendication 14, dans lequel l'étape de mise en position du couvercle (10) par-dessus la couche de matériau compressible comprend les étapes suivantes :
    placer le couvercle sur le dessus, et
    enfoncer le couvercle en position de sorte qu'une surface latérale (9) du couvercle (10) coulisse contre la surface intérieure (7) de la lèvre (17) s'étendant depuis le corps du filtre, de façon à éviter que le matériau granulaire diélectrique ne soit expulsé.
  16. Procédé de construction d'un filtre radiofréquence selon la revendication 14 ou la revendication 15, dans lequel la quantité de matériau granulaire (6) est ajustée avant compression en mettant le couvercle en position, de façon à ajuster la densité du matériau granulaire dans le filtre.
EP13290142.2A 2013-06-14 2013-06-14 Filtre de fréquence radio, procédé de filtrage de fréquence radio et procédé de construction dudit filtre Active EP2814110B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13290142.2A EP2814110B1 (fr) 2013-06-14 2013-06-14 Filtre de fréquence radio, procédé de filtrage de fréquence radio et procédé de construction dudit filtre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13290142.2A EP2814110B1 (fr) 2013-06-14 2013-06-14 Filtre de fréquence radio, procédé de filtrage de fréquence radio et procédé de construction dudit filtre

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EP2814110A1 EP2814110A1 (fr) 2014-12-17
EP2814110B1 true EP2814110B1 (fr) 2018-04-25

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL257104A (fr) * 1959-10-23
US4166256A (en) * 1977-01-05 1979-08-28 Hughes Aircraft Company Anti multipacting resonant cavity
DE3541585A1 (de) * 1985-11-25 1987-05-27 Siemens Ag Filter fuer sehr kurze elektromagnetische wellen
EP1516403A1 (fr) * 2002-06-26 2005-03-23 Pirelli & C. S.p.A. Procede et dispositif pour terminaison de cable electrique
BR0317194A (pt) * 2003-01-31 2005-11-29 Ems Technologies Inc Conjunto conformável de antenas dispostos em camadas
SG165149A1 (en) * 2003-10-22 2010-10-28 Zhang Yue Ping Integrating an antenna and a filter in the housing of a device package

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* Cited by examiner, † Cited by third party
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