EP3240100A1 - Filtre de fréquence radio comprenant une chambre et procédé de filtrage - Google Patents

Filtre de fréquence radio comprenant une chambre et procédé de filtrage Download PDF

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Publication number
EP3240100A1
EP3240100A1 EP16305491.9A EP16305491A EP3240100A1 EP 3240100 A1 EP3240100 A1 EP 3240100A1 EP 16305491 A EP16305491 A EP 16305491A EP 3240100 A1 EP3240100 A1 EP 3240100A1
Authority
EP
European Patent Office
Prior art keywords
radio frequency
dielectric layer
feeding member
frequency filter
end portion
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Withdrawn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
EP16305491.9A
Other languages
German (de)
English (en)
Inventor
Florian Pivit
Bulja SENAD
Efstratios Doumanis
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
Original Assignee
Alcatel Lucent SAS
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 Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Priority to EP16305491.9A priority Critical patent/EP3240100A1/fr
Publication of EP3240100A1 publication Critical patent/EP3240100A1/fr
Withdrawn legal-status Critical Current

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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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • 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
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/107—Hollow-waveguide/strip-line transitions

Definitions

  • the present invention relates to a radio frequency filter and to a method of radio frequency filtering.
  • connection of a power amplifier (PA) to a Radio-Frequency (RF) filter is important in any telecommunications system.
  • This connection needs to be low loss, as the power output of the power amplifier can be of the order of tens of watts and so any loss at this connection will significantly impact the overall loss of the system.
  • An example of the present invention is a radio frequency filter comprising a chamber comprising a first wall, a second wall opposite said first wall, side walls, and end walls, in which a radio frequency feeding member is disposed at least substantially within the chamber, the feeding member including an end portion which extends into a gap in the top wall so as to connect to a dielectric layer lying over the gap; in use, a radio frequency signal being coupled into the feeding member via the dielectric layer so as to be electromagnetically coupled into the filter or being coupled out of the feeding member via the dielectric layer so as to be electromagnetically coupled from the filter.
  • said end portion connects to the dielectric layer by being in contact with the dielectric layer.
  • said end portion connects to the dielectric layer by being in proximity with the dielectric layer.
  • the dielectric layer has a metal layer on its surface facing towards the chamber, in a region the metal layer being at least partially removed so that the end portion of the feeding member electrically connects to the dielectric layer in that region.
  • the metal layer has been at least partially etched away.
  • a conductor is provided on a second surface of the dielectric layer, said second surface facing away from the chamber; and in which for electromagnetic coupling via the dielectric layer into or from the feeding member, the conductor has an end portion opposite said region.
  • the dielectric layer, the conductor and the bottom metal layer including said region comprise a Printed Circuit Board, PCB.
  • the conductor was produced by etching away at a metal layer on the top surface of the dielectric layer.
  • the end portion of the conductor, the gap in the top wall and the region for contact with the dielectric layer lie on a shared axis.
  • the shared axis is perpendicular to the plane of the top wall.
  • the conductor is a microstrip line.
  • the end portion of the conductor is at least one of at least partially circular and at least partially rectangular.
  • the gap is a hole having an inside surface and the end portion of the feeding member is of a size so as to fit into the cylindrical hole without touching its inside surface.
  • the gap may be a cylindrical hole having an inside surface and the end portion of the feeding member is cylindrical having a diameter so as to fit into the cylindrical hole without touching its inside surface.
  • the feeding member has a body portion, and the end portion of the feeding member is a head portion which is narrower than the body portion.
  • the chamber houses at least one resonator post.
  • first wall is a top wall and the second wall is a bottom wall.
  • the feeding member is a feeding pin. Furthermore, preferably the feeding member is metallic or of some other other electrically conductive material.
  • the present invention also relates to method of radio frequency filtering comprising passing a signal for filtering through a radio frequency filter comprising a chamber comprising a first wall, a second wall opposite said first wall, side walls, and end walls; in which a radio frequency feeding member is disposed at least substantially within the chamber; the feeding member including an end portion which extends into a gap in the top wall so as to contact a dielectric layer lying over the gap; in use, a radio frequency signal being coupled into the feeding member via the dielectric layer so as to be electromagnetically coupled into the filter or being coupled out of the feeding member via the dielectric layer so as to be electromagnetically coupled from the filter.
  • Preferred embodiments provide non-galvanic Printed Circuit Board (PCB) feeding of Radio Frequency (RF) cavity filters. Preferred embodiments provide a low loss solution.
  • PCB Printed Circuit Board
  • RF Radio Frequency
  • a PCB is etched on its top side to provide a microstrip line ending in a circular metal disc.
  • the metal is totally etched away (or patterned in a way that some metal has been removed) in a circular disc region below, for example exactly below, the microstrip line end on the top side of the PCB.
  • This region is a gap in the metal layer allows electromagnetic coupling of signals between (to and/or from) the filter cavity and the microstrip line.
  • a feeding pin extends through the filter housing through a gap so as to directly contact that region on the bottom side of the PCB, so allowing electromagnetic energy to be coupled into the resonator cavity from the microstrip line on the top of the PCB, thereby enabling filter operation.
  • Preferred embodiments provide a solution of good reliability. Preferred embodiments provide a simple way of RF coupling into an RF filter.
  • Preferred embodiments provide a filter assembly with low Passive Inter-Modulation (PIM).
  • PIM Passive Inter-Modulation
  • Preferred embodiments provide capacitive coupling, which is especially suitable for bandwidth limited devices, for example RF filters with one or more resonator cavities.
  • Preferred embodiments have technical advantages compared to Chinese Utility Model Publication CN201946726 (U ). For example, there is no need for a screw to ensure coupling between an external conductor and an RF feeding pin which is inside the cavity. There is no need for a galvanic connection between a PCB and the feeding pin; in consequence reliability and Passive Inter-Modulation (PIM) performance is enhanced. There is no need for an EMC gasket. In preferred embodiments there may be no negative impact on key filter performance indicators, such as bandwidth and power handling, and preferred embodiments are resilient to many mechanical variations in components, such as PCB dimensions.
  • FIG. 1 is a top view of this filter showing the feed made up of the feeding pin and the connector to the feeding pin on the top surface of the PCB.
  • EMC ElectroMagnetic Compatibility
  • a Radio Frequency filter 2 comprising a resonant chamber 3 which includes a filter cavity 4 defined by a top wall 6, a bottom wall 8, side walls 10 and end walls 12. Within the filter cavity 4 are coupling walls 14 of less than full height which separate resonator cavities 16 within the filter cavity 4. It will, of course, be understood that Figure 3 shows the end portion of the filter 2 rather than the whole filter. Within each resonator cavity 16 there is a resonator post (not shown) of known type.
  • the RF feeding pin 18 is made of metal, in other words, metallic.
  • PCB Printed Circuit Board
  • the microstrip line is etched onto the top surface 28 of the PCB 24.
  • the microstrip line 12 ends in a substantially circular metal disc- portion 30.
  • the metal is etched away completely in the region 34, but in an otherwise similar embodiment (not shown) the metal is partially removed for example with an etching pattern.
  • the etched region 34 (in other words exposed dielectric region) allows electromagnetic coupling of a signal into the filter cavity 4 via the microstrip line 26 and from the filter cavity 4 to the microstrip line 26.
  • the PCB includes a small area 36 on its bottom surface 32 also etched and provided with a hole 38 for a tuning screw (not shown).
  • the PCB 24 also has multiple holes 40 for holding screws (not shown).
  • Figure 5 is another cross-section having a different but parallel cutting plane to that of Figure 3 .
  • the head portion 22 of the feeding pin 18 lies directly under a PCB 24.
  • the etched region 34 in the metal base layer 36 of the PCB 24 allows electromagnetic coupling between the disc-portion 30 of the microstrip line 26 and the head portion 22 of the RF feeding pin 18.
  • the purpose of the RF feeding pin 18 is two-fold. In a filter made up of multiple resonator cavities 16 in a row, an RF feeding pin couples energy to or from the resonator cavity 16 at the end of the row (as shown in Figures 3 to 5 ). It also couples that electromagnetic energy to or from the microwave strip line 26.
  • the top wall 6 including an opening 42 through which the head portion 22 of the RF feeding pin 18 is in direct contact with the etched region 34 of the PCB 24, so as to contact the exposed dielectric of the PCB 26, thereby coupling the disc-portion 30 of the microstrip line 26.
  • This enables the filter to correctly operate.
  • the amount of coupling depends on the size of the opening 42 in the top wall 6 (in other words in the housing), and also the width of the microstrip line 26, for example in particular its end disc portion 30. Both this size and this width are selected during the stage of designing the filter 2.
  • Figure 6 is a further oblique sectional view of the end portion of the filter 2, being a cross-section having a different but parallel cutting plane to that of Figures 3 and 5 .
  • a cylindrical resonator post 44 is shown.
  • the RF feeding pin 18 is also shown.
  • Figure 7 is a further oblique sectional view of the end portion filter 2. As shown in Figure 7 , there are multiple resonator posts 44 each having a hollowed portion 46 and a solid portion 48. The resonator post 44 nearest RF feeding pin 18 is connected directly to the RF feeding pin 18 by a Direct Current (DC) connection 50.
  • DC Direct Current
  • coupling screws 52 go through the coupling screw holes 40 of the PCB 24 and a tuning screw 54 goes through the corresponding hole 38 in th PCB. Theses coupling screws 52 and tuning screw 54 are required to tune the electrical response of the filter 2 and are effectively incorporated in the PCB 24.
  • the filter 2 is a 3 pole filter, in other wards having three resonator cavities 16.
  • the filter 2 includes at one end 56, the end portion shown in Figures 3 and 5 to 7 , and a known feeding pin 58 at the other end 60.
  • this particular example includes the following:
  • the filter can have more, or less, than three resonator cavities, in other words, more, or less, than 3 poles.
  • the RF feeding pin consists of one or more metal cylinders of different diameters to each other.
  • the dielectric material of the PCB 24 is RO4350B laminate as sold by Rogers Corporation; for further details of which, please see: https://www.rogerscorp.com/acs/products/55/R04350B-Laminates.aspx
  • the end portion of the microstrip line is of a different shape than the circular end portion 30, for example rectangular, hexagonal or any other shape.
  • program storage devices e.g., digital data storage media, which are machine or computer readable and encode machine-executable or computer-executable programs of instructions, wherein said instructions perform some or all of the steps of said above-described methods.
  • the program storage devices may be, e.g., digital memories, magnetic storage media such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media.
  • Some embodiments involve computers programmed to perform said steps of the above-described methods.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP16305491.9A 2016-04-28 2016-04-28 Filtre de fréquence radio comprenant une chambre et procédé de filtrage Withdrawn EP3240100A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16305491.9A EP3240100A1 (fr) 2016-04-28 2016-04-28 Filtre de fréquence radio comprenant une chambre et procédé de filtrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16305491.9A EP3240100A1 (fr) 2016-04-28 2016-04-28 Filtre de fréquence radio comprenant une chambre et procédé de filtrage

Publications (1)

Publication Number Publication Date
EP3240100A1 true EP3240100A1 (fr) 2017-11-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16305491.9A Withdrawn EP3240100A1 (fr) 2016-04-28 2016-04-28 Filtre de fréquence radio comprenant une chambre et procédé de filtrage

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EP (1) EP3240100A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109888443A (zh) * 2019-04-09 2019-06-14 深圳市阿赛姆电子有限公司 一种微带贴片滤波器
CN114243240A (zh) * 2022-01-24 2022-03-25 南通大学 一种3d打印与pcb融合的可集成滤波器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278957A (en) * 1979-07-16 1981-07-14 Motorola, Inc. UHF Filter assembly
US20080024249A1 (en) * 2004-09-16 2008-01-31 Kathrein-Austria Ges.M.B.H. High-Frequency Filter
US20100045406A1 (en) * 2006-09-14 2010-02-25 Krister Andreasson Rf filter module
CN201946726U (zh) 2010-11-23 2011-08-24 深圳市大富科技股份有限公司 一种腔体滤波器及通信设备
EP2800201A1 (fr) * 2011-12-30 2014-11-05 Huawei Technologies Co., Ltd. Filtre à haute fréquence

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278957A (en) * 1979-07-16 1981-07-14 Motorola, Inc. UHF Filter assembly
US20080024249A1 (en) * 2004-09-16 2008-01-31 Kathrein-Austria Ges.M.B.H. High-Frequency Filter
US20100045406A1 (en) * 2006-09-14 2010-02-25 Krister Andreasson Rf filter module
CN201946726U (zh) 2010-11-23 2011-08-24 深圳市大富科技股份有限公司 一种腔体滤波器及通信设备
EP2800201A1 (fr) * 2011-12-30 2014-11-05 Huawei Technologies Co., Ltd. Filtre à haute fréquence

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109888443A (zh) * 2019-04-09 2019-06-14 深圳市阿赛姆电子有限公司 一种微带贴片滤波器
CN109888443B (zh) * 2019-04-09 2019-12-17 深圳市阿赛姆电子有限公司 一种微带贴片滤波器
CN114243240A (zh) * 2022-01-24 2022-03-25 南通大学 一种3d打印与pcb融合的可集成滤波器

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