EP0817301A1 - Justiervorrichtung für die Kopplungseinstellung von Funkfrequenzfilter - Google Patents

Justiervorrichtung für die Kopplungseinstellung von Funkfrequenzfilter Download PDF

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Publication number
EP0817301A1
EP0817301A1 EP97110682A EP97110682A EP0817301A1 EP 0817301 A1 EP0817301 A1 EP 0817301A1 EP 97110682 A EP97110682 A EP 97110682A EP 97110682 A EP97110682 A EP 97110682A EP 0817301 A1 EP0817301 A1 EP 0817301A1
Authority
EP
European Patent Office
Prior art keywords
input port
radio frequency
resonator
port means
frequency filter
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.)
Granted
Application number
EP97110682A
Other languages
English (en)
French (fr)
Other versions
EP0817301B1 (de
Inventor
Dieter Pelz
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
Alcatel Alsthom Compagnie Generale dElectricite
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, Alcatel Alsthom Compagnie Generale dElectricite filed Critical Alcatel SA
Publication of EP0817301A1 publication Critical patent/EP0817301A1/de
Application granted granted Critical
Publication of EP0817301B1 publication Critical patent/EP0817301B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01P1/201—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

  • This invention 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.
  • adjustment may be obtained by bending the loop with a probe inserted through an aperture in the filter housing to displace the loop in relation to the adjacent resonator element, or deforms it.
  • fine adjustment is difficult, particularly if the area in which the loop is located is too small to allow a safe bending action, as there is a likelihood of mechanical damage during the adjustment process.
  • a radio frequency filter comprising a housing means containing at least one resonator element, an input port means and at least one output port means, said filter further including an arrangement for adjustably coupling said input port means to at least one resonator element, said arrangement comprising an elongated resilient conductor element of a predetermined dimension arranged to capacitively couple said input port means to said at least one resonator element's electric field zone, wherein said resilient conductor element is arranged to cooperate with lever means of electrical insulating material that can be manually activated by a connected actuating means mounted externally on a wall of said housing means, to move said resilient conductive element thereby adjusting capacitive coupling between said input port means and said resonator element's electric field.
  • 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 20 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 out the first resonator of filter B.
  • the shaft and point of adjustment screws 30 and 31 are made 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)
EP97110682A 1996-07-01 1997-07-01 Justiervorrichtung für die Kopplungseinstellung von Funkfrequenzfilter Expired - Lifetime EP0817301B1 (de)

Applications Claiming Priority (3)

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

Publications (2)

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

Family

ID=3795080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110682A Expired - Lifetime EP0817301B1 (de) 1996-07-01 1997-07-01 Justiervorrichtung für die Kopplungseinstellung von Funkfrequenzfilter

Country Status (4)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077879A2 (de) * 1999-06-11 2000-12-21 Robert Bosch Gmbh Mikrowellenfilter
EP2928010A1 (de) * 2014-03-28 2015-10-07 Innertron, Inc. Multiplexer

Citations (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 (de) * 1980-07-30 1982-02-11 Siemens AG, 1000 Berlin und 8000 München Antennenweiche, bestehend aus wenigstens zwei parallelgeschalteten filtern fuer sehr kurze elektromagnetische wellen
EP0334270A1 (de) * 1988-03-23 1989-09-27 Alcatel Telspace Mikrowellen-Anpassungsvorrichtung für einen Übergang zwischen einem Hohlleiter und einer Planarleitung
DE4005230A1 (de) * 1990-02-20 1991-08-22 Bosch Gmbh Robert Uhf-filter
WO1996002073A1 (fr) * 1994-07-07 1996-01-25 Communaute Europeenne Transformateur d'impedance a haute frequence

Patent Citations (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 (de) * 1980-07-30 1982-02-11 Siemens AG, 1000 Berlin und 8000 München Antennenweiche, bestehend aus wenigstens zwei parallelgeschalteten filtern fuer sehr kurze elektromagnetische wellen
EP0334270A1 (de) * 1988-03-23 1989-09-27 Alcatel Telspace Mikrowellen-Anpassungsvorrichtung für einen Übergang zwischen einem Hohlleiter und einer Planarleitung
DE4005230A1 (de) * 1990-02-20 1991-08-22 Bosch Gmbh Robert Uhf-filter
WO1996002073A1 (fr) * 1994-07-07 1996-01-25 Communaute Europeenne Transformateur d'impedance a haute frequence

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
K. PICHLER ET AL.: "VIERKREIS-UHF-BANDFILTER YH AF 1010", SIEMENS-BAUTEILE-INFORMATIONEN, vol. 6, no. 6, December 1968 (1968-12-01), MÜNCHEN, pages 200 - 201, XP002042875 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000077879A2 (de) * 1999-06-11 2000-12-21 Robert Bosch Gmbh Mikrowellenfilter
WO2000077879A3 (de) * 1999-06-11 2001-04-26 Bosch Gmbh Robert Mikrowellenfilter
EP2928010A1 (de) * 2014-03-28 2015-10-07 Innertron, Inc. Multiplexer
US9667298B2 (en) 2014-03-28 2017-05-30 Innertron, Inc. Multiplexer

Also Published As

Publication number Publication date
DE69715329D1 (de) 2002-10-17
EP0817301B1 (de) 2002-09-11
AUPO076496A0 (en) 1996-07-25
CA2209419A1 (en) 1998-01-01
DE69715329T2 (de) 2003-05-22
CA2209419C (en) 2000-08-15

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