EP0817301B1 - Input coupling adjustment arrangement for radio frequency filters - Google Patents

Input coupling adjustment arrangement for radio frequency filters Download PDF

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Publication number
EP0817301B1
EP0817301B1 EP97110682A EP97110682A EP0817301B1 EP 0817301 B1 EP0817301 B1 EP 0817301B1 EP 97110682 A EP97110682 A EP 97110682A EP 97110682 A EP97110682 A EP 97110682A EP 0817301 B1 EP0817301 B1 EP 0817301B1
Authority
EP
European Patent Office
Prior art keywords
input port
radio frequency
filter
port means
resonator
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.)
Expired - Lifetime
Application number
EP97110682A
Other languages
German (de)
French (fr)
Other versions
EP0817301A1 (en
Inventor
Pelz Dieter
Natalie Trembath
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 SA
Nokia Inc
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 SA, Nokia Inc filed Critical Alcatel SA
Publication of EP0817301A1 publication Critical patent/EP0817301A1/en
Application granted granted Critical
Publication of EP0817301B1 publication Critical patent/EP0817301B1/en
Anticipated expiration legal-status Critical
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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
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling

Definitions

  • the invention is concerned with a radio frequency filter according to the preamble of claim 1 (DE 30 28 925 A).
  • the invention hence relates to radio frequency bandpass filters that incorporate resonator elements, and in particular to an adjustable coupling arrangement for adjustably coupling the filter's input means to the filter's first resonator element to obtain optimum impedance matching between elements of the input means and elements of the bandpass filter for maximum transfer of energy.
  • the above mentioned DE 30 28 925 A discloses a filter arrangement incorporating an inductive loop coupling means.
  • the known filter has a housing means with six resonator elements and an input port means and at least one output port means.
  • the filter further includes an arrangement for adjustably coupling the input port means to one resonator element and the arrangement comprises an elongated resilient conductor element of a predetermined dimension arranged to couple the input port means to the one resonator element's field zone.
  • GB 849 490 A describes a coupling device for coupling a high impedance narrow band signal source to a low impedance transmission line in an RF amplifier, which is an active device.
  • the coupling device is in the form of a capacitive probe inside a resonator-like structure of a tube-type RF-amplifier.
  • the electrical properties of the coupling arrangement according to the invention are generally equivalent to, and in some cases better than those of loop coupling, while avoiding the inherent disadvantages of loop coupling.
  • the radio frequency bandpass filter 1 comprises a rectangular block of conductive material in which are formed four aperture coupled co-axial resonators (2, 3, 4 and 5) of predetermined dimensions, each comprising a resonator rod (6, 7, 8 and 9) within a cavity having a side wall 10, a bottom wall 11, and a top wall (not shown); the latter wall being formed by a removable plate common to all cavities. Adjacent resonators are coupled by an aperture 12, 13 and 14 in the side wall.
  • An input port 15 comprising a conductor 16 which extends into resonator 2 to couple the input port to the filter.
  • An output port 17 comprises a conductor 18 which extends into resonator 5 to couple the filter to the output port.
  • a flat resilient conductor 19 which is provided with a bend intermediate its length such that its free end resiliently abuts the point 20 of an adjustment screw 20a which extends into resonator 2.
  • the shaft and point of screw 20 are made of suitable electrical insulating material such as, for example, aluminium oxide.
  • Resilient conductor 19 acts electrically like a transmission line and its end section couples input port 15 to the electric field of resonator 2.
  • Optimum coupling is obtained by operating screw 20a to move conductor 19 in relation to resonator rod 6, and using a return loss measurement means or any other known means for measuring the reflection factor to find optimum impedance match over a given bandwidth.
  • the high frequency diplexer 21 comprises a rectangular block of conductive material in which is formed a high bandpass filter A and a low bandpass filter B.
  • Each filter comprises four aperture coupled co-axial resonators of predetermined dimensions.
  • the resonators are similar to those described above in relation to Figures 1 and 2.
  • the diplexer 21 includes a single input port 22 comprising a conductor 23 which extends into a passage 24 connecting the first resonator of filter A to the first resonator of filter B, and two output ports 25 and 26.
  • Output port 25 comprises a conductor 27 which extends into the last resonator of filter A
  • output port 26 comprises a conductor 28 which extends into the last resonator of filter B.
  • Conductor 23 of input port 22 is connected to a flat elongated resilient conductor 29 at a point intermediate the length of the conductor.
  • the length of the conductor is such that each end thereof resiliently abuts the point of a respective adjustment screw 30 and 31, adjustment screw 30 extending into the first resonator of filter A and adjustment screw 31 extending into the first resonator of filter B.
  • the shaft and point of adjustment screws 30 and 31 are mode of suitable electrical insulating material such as, for example, aluminium oxide.
  • Optimum coupling of the input port to filters A and B is obtained by operating screws 30 and 31 to move the ends of conductor 29 in relation to the resonator rods of the first resonators, and using a return loss measurement means or any other known means for measuring the reflection factor to locate optimum impedance match between elements connected to the input port and filters A and B.

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

Description

The invention is concerned with a radio frequency filter according to the preamble of claim 1 (DE 30 28 925 A).
The invention hence relates to radio frequency bandpass filters that incorporate resonator elements, and in particular to an adjustable coupling arrangement for adjustably coupling the filter's input means to the filter's first resonator element to obtain optimum impedance matching between elements of the input means and elements of the bandpass filter for maximum transfer of energy.
It is known, for example from US 5,389,903 A, to couple the input means of a bandpass filter of the aforementioned type to a first co-axial resonator element via a loop of wire. One end of the loop is connected to the filters input terminal within the filter housing. The other end of the loop is connected to an internal surface of the housing. The loop inductively couples the filter's input terminal to the first resonator element.
The above mentioned DE 30 28 925 A discloses a filter arrangement incorporating an inductive loop coupling means. The known filter has a housing means with six resonator elements and an input port means and at least one output port means. The filter further includes an arrangement for adjustably coupling the input port means to one resonator element and the arrangement comprises an elongated resilient conductor element of a predetermined dimension arranged to couple the input port means to the one resonator element's field zone.
GB 849 490 A describes a coupling device for coupling a high impedance narrow band signal source to a low impedance transmission line in an RF amplifier, which is an active device. The coupling device is in the form of a capacitive probe inside a resonator-like structure of a tube-type RF-amplifier.
It is an object of the invention, to improve the radio frequency filter mentioned above.
To meet this object the invention is characterised by the characterising features of claim 1.
The electrical properties of the coupling arrangement according to the invention are generally equivalent to, and in some cases better than those of loop coupling, while avoiding the inherent disadvantages of loop coupling.
In order that the invention may be readily carried into effect, embodiments thereof will now be described in relation to the accompanying drawings, in which:
Figure 1
shows a top view of the mechanical structure of a bandpass filter incorporating the adjustable coupling arrangement of the present invention.
Figure 2
shows a cross-sectional view of the mechanical structure shown in Figure 1.
Figure 3
shows a top view of the mechanical structure of a diplexer filter incorporating the adjustable coupling arrangement of the present invention.
Figure 4
shows a side view of a conductive element of the coupling arrangement shown in Figure 3.
Referring to Figures 1 -2 , the radio frequency bandpass filter 1 comprises a rectangular block of conductive material in which are formed four aperture coupled co-axial resonators (2, 3, 4 and 5) of predetermined dimensions, each comprising a resonator rod (6, 7, 8 and 9) within a cavity having a side wall 10, a bottom wall 11, and a top wall (not shown); the latter wall being formed by a removable plate common to all cavities. Adjacent resonators are coupled by an aperture 12, 13 and 14 in the side wall.
An input port 15 comprising a conductor 16 which extends into resonator 2 to couple the input port to the filter. An output port 17 comprises a conductor 18 which extends into resonator 5 to couple the filter to the output port.
From the end of conductor 16 there extends a flat resilient conductor 19 which is provided with a bend intermediate its length such that its free end resiliently abuts the point 20 of an adjustment screw 20a which extends into resonator 2. The shaft and point of screw 20 are made of suitable electrical insulating material such as, for example, aluminium oxide.
Resilient conductor 19 acts electrically like a transmission line and its end section couples input port 15 to the electric field of resonator 2.
Optimum coupling is obtained by operating screw 20a to move conductor 19 in relation to resonator rod 6, and using a return loss measurement means or any other known means for measuring the reflection factor to find optimum impedance match over a given bandwidth.
Referring to Figures 3-4, the high frequency diplexer 21 comprises a rectangular block of conductive material in which is formed a high bandpass filter A and a low bandpass filter B. Each filter comprises four aperture coupled co-axial resonators of predetermined dimensions. The resonators are similar to those described above in relation to Figures 1 and 2. The diplexer 21 includes a single input port 22 comprising a conductor 23 which extends into a passage 24 connecting the first resonator of filter A to the first resonator of filter B, and two output ports 25 and 26. Output port 25 comprises a conductor 27 which extends into the last resonator of filter A, and output port 26 comprises a conductor 28 which extends into the last resonator of filter B.
Conductor 23 of input port 22 is connected to a flat elongated resilient conductor 29 at a point intermediate the length of the conductor. The length of the conductor is such that each end thereof resiliently abuts the point of a respective adjustment screw 30 and 31, adjustment screw 30 extending into the first resonator of filter A and adjustment screw 31 extending into the first resonator of filter B. The shaft and point of adjustment screws 30 and 31 are mode of suitable electrical insulating material such as, for example, aluminium oxide.
Optimum coupling of the input port to filters A and B is obtained by operating screws 30 and 31 to move the ends of conductor 29 in relation to the resonator rods of the first resonators, and using a return loss measurement means or any other known means for measuring the reflection factor to locate optimum impedance match between elements connected to the input port and filters A and B.

Claims (3)

  1. A radio frequency filter comprising a housing means containing a plurality of co-axial resonator elements (2,3,4 and 5), an input port means (15,30,31) and at least one output port means (17,25 and 26), the filter further including an arrangement for adjustably coupling the input port means to at least one resonator element (2), the arrangement comprising an elongated resilient conductor element (19) of predetermined dimensions that is arranged to couple the input port means (15,30,31) to the electric field zone of a first one of a plurality of coupled resonator elements, characterized in that the resilient conductor element (19) is arranged to capacitively couple the input port to the respective electric field zone and co-operates with lever means (20) of electrical insulating material that can be manually activated by a connected actuating means (20a) mounted externally in a wall of the housing means, to move the resilient conductive element (19) thereby adjusting capacitive coupling between the input port means (15,30,31) and the resonator element's electric field.
  2. A radio frequency filter as claimed in claim 1, characterised in that the housing means contains a first array of coupled resonator elements (A) and an adjoining second array of coupled resonator elements (B), the input port means (22) being common to both arrays and respective output port means (25,26) for each array.
  3. A radio frequency filter as claimed in claim 2, characterised in that each end portion of said resilient conductor (29) is relatively wider than the portion therebetween.
EP97110682A 1996-07-01 1997-07-01 Input coupling adjustment arrangement for radio frequency filters Expired - Lifetime EP0817301B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPO0764A AUPO076496A0 (en) 1996-07-01 1996-07-01 Input coupling adjustment arrangement for radio frequency filters
AUPO0764/96 1996-07-01
AUPO076496 1996-07-01

Publications (2)

Publication Number Publication Date
EP0817301A1 EP0817301A1 (en) 1998-01-07
EP0817301B1 true EP0817301B1 (en) 2002-09-11

Family

ID=3795080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110682A Expired - Lifetime EP0817301B1 (en) 1996-07-01 1997-07-01 Input coupling adjustment arrangement for radio frequency filters

Country Status (4)

Country Link
EP (1) EP0817301B1 (en)
AU (1) AUPO076496A0 (en)
CA (1) CA2209419C (en)
DE (1) DE69715329T2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023159482A1 (en) 2022-02-25 2023-08-31 Telefonaktiebolaget Lm Ericsson (Publ) A communication device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926571A1 (en) * 1999-06-11 2000-12-14 Bosch Gmbh Robert Microwave filter
KR101561285B1 (en) 2014-03-28 2015-10-20 주식회사 이너트론 Multi-band filter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB849490A (en) * 1957-09-24 1960-09-28 Gen Electric Co Ltd Improvements in or relating to coupling devices for coupling a coaxial transmission line to an electrical device
DE3028925A1 (en) * 1980-07-30 1982-02-11 Siemens AG, 1000 Berlin und 8000 München Quarter wave branch connector for HF aerials - has junction with coupling loops at input resonators of twin parallel filters
FR2629276B1 (en) * 1988-03-23 1991-06-07 Alcatel Thomson Faisceaux ADJUSTING MICROWAVE DEVICE FOR A PLANAR WAVE-LINE TRANSITION
DE4005230A1 (en) * 1990-02-20 1991-08-22 Bosch Gmbh Robert UHF filter circuitry - has extra conductor, as output coupling bracket, adjacent to output circuit
FR2722338B1 (en) * 1994-07-07 1996-09-13 Europ Communities COUPLING AND ADAPTING DEVICE FOR TRANSMITTING HIGH FREQUENCY OR MICROWAVE SIGNALS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023159482A1 (en) 2022-02-25 2023-08-31 Telefonaktiebolaget Lm Ericsson (Publ) A communication device
EP4437618A4 (en) * 2022-02-25 2025-08-06 Ericsson Telefon Ab L M COMMUNICATION DEVICE

Also Published As

Publication number Publication date
EP0817301A1 (en) 1998-01-07
CA2209419C (en) 2000-08-15
DE69715329D1 (en) 2002-10-17
AUPO076496A0 (en) 1996-07-25
DE69715329T2 (en) 2003-05-22
CA2209419A1 (en) 1998-01-01

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