EP1689019A1 - Filtre coaxial equilibré - Google Patents

Filtre coaxial equilibré Download PDF

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Publication number
EP1689019A1
EP1689019A1 EP06001134A EP06001134A EP1689019A1 EP 1689019 A1 EP1689019 A1 EP 1689019A1 EP 06001134 A EP06001134 A EP 06001134A EP 06001134 A EP06001134 A EP 06001134A EP 1689019 A1 EP1689019 A1 EP 1689019A1
Authority
EP
European Patent Office
Prior art keywords
inner conductor
axially displaceable
conductor
conductors
filter according
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Withdrawn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
EP06001134A
Other languages
German (de)
English (en)
Inventor
Friedrich Jakob
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.)
Spinner GmbH
Original Assignee
Spinner GmbH
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 Spinner GmbH filed Critical Spinner GmbH
Publication of EP1689019A1 publication Critical patent/EP1689019A1/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Withdrawn legal-status Critical Current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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/202—Coaxial filters

Definitions

  • the invention relates to a coaxial tunable filter, comprising at least one stage which comprises an outer conductor, a first inner conductor and a second inner conductor, which is capacitively coupled to the latter and has the same axis.
  • first and second inner conductors are dimensioned to form a longitudinal capacitance of a predetermined value, optionally in conjunction with a dielectric other than air. If this value is to be adjustable, one of the inner conductors may be formed telescopically.
  • the displaceable part of this inner conductor is electroplated with its fixed part, e.g. via spring blades, contacted.
  • intermodulation products arise, which, given high intermodulation distance requirements, e.g. in mobile communications are not tolerable.
  • the invention has for its object to provide a contrast manufacturing simpler, coaxial filter that can be adjusted, but does not give rise to intermodulation products.
  • This object is achieved by a third inner conductor, which is capacitively coupled to both the first and the second inner conductor and axially displaceable.
  • the filter thus has tunable longitudinal capacitances in coaxial technology, but does not require galvanic contacts and is therefore intermodulation-free.
  • the first inner conductor and the second inner conductor are surrounded by an insulating sleeve in the region of their capacitive coupling, and the third inner conductor is designed as a metal sleeve which is axially displaceable on the insulating sleeve.
  • the first and the second inner conductor can telescopically mesh in the region of their capacitive coupling, but remain galvanically separated from one another.
  • the telescopically engaging portions of the first and second inner conductors may be separated by an insulating sleeve. This has the advantage that it is possible to influence the overall length by choosing an insulating material with a suitable relative dielectric constant.
  • first inner conductor and the second inner conductor are at least tubular in area of their capacitive coupling and enclose a common insulating sleeve in which the third inner conductor is axially displaceable, e.g. via a longitudinal slot in the first and / or the second inner conductor and the insulating sleeve.
  • first and the second inner conductor may be axially displaceable relative to each other.
  • the outer conductor (with a circular or polyonal inner cross-section) can be divided longitudinally or, for example, in the longitudinal direction. be equipped with a removable lid. Instead, the outer conductor can also be provided at the adjustment points with a closable opening.
  • the third inner conductor can be fixed with any suitable HF-compatible means, for example by gluing or by PTFE rings.
  • a first inner conductor 1 and a second inner conductor 2 are arranged in an outer conductor 5.
  • the end face of the inner conductor 1 faces that of the inner conductor 2 at a given distance.
  • the inner conductors On a calculated length, the inner conductors have 1 and 2 sections 1.1 and 2.1 with a reduced diameter. Sections 1.1 and 2.1 are seated in a common insulating sleeve 4.
  • the insulating sleeve 4 is surrounded by a third, tubular inner conductor 3, which is axially displaceable by a distance a in the direction of the inner conductor 1 or the inner conductor 2.
  • the inner conductors 1 and 2 including their sections 1.1 and 2.1 and the inner conductor 3 act in conjunction with the outer conductor. 5 as inductances whose values can be calculated, for example, by means of the commercial software APLAC from the corresponding diameters and lengths.
  • Fig. 5 shows a modification of the embodiment according to Figures 3 and 4.
  • the sections 1.1 and 2.1 of the inner conductors 1 and 2 are no longer with their end faces in a predetermined distance opposite but engage telescopically in one another.
  • a Isolierstoffbüchse 6 is arranged between the section 1.1 of the inner conductor 1 and the section 2.1 of the inner conductor 2.
  • Both the immersion depth of the inner conductor section 1.1 as well as the thickness and the material of the insulating material 6, the value of C0 can be influenced.
  • the fine adjustment takes place as in the case of FIG. 3 by displacing the third inner conductor Third
  • Fig. 6 shows another embodiment based on the same principle.
  • the inner conductors 1 and 2 each end in tubular or hollow cylindrical sections 1.2 and 2.2. These sections enclose a common insulating sleeve 4.1.
  • a third inner conductor 3.1 is disposed axially displaceable by a distance a.
  • the sections 1.2 and 2.2 of the inner conductors 1 and 2 and the insulating sleeve 4.1 have a common longitudinal slot S, via a transverse bore 3.1.1 of the third inner conductor 3 is accessible to the latter by means of a suitable tool for the purpose of balancing to move axially.
  • Fig. 7 shows the corresponding longitudinal capacitances in connection with the equivalent circuit diagram.
  • C ges C 0 + ( C 01 + C 1 ) ⁇ ( C 02 + C 2 ) C 01 + C 02 + C 1 + C 2 ;

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
EP06001134A 2005-02-03 2006-01-19 Filtre coaxial equilibré Withdrawn EP1689019A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005005088 2005-02-03

Publications (1)

Publication Number Publication Date
EP1689019A1 true EP1689019A1 (fr) 2006-08-09

Family

ID=36268748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06001134A Withdrawn EP1689019A1 (fr) 2005-02-03 2006-01-19 Filtre coaxial equilibré

Country Status (3)

Country Link
US (1) US7348869B2 (fr)
EP (1) EP1689019A1 (fr)
CN (1) CN1815801A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009012794A1 (fr) * 2007-07-24 2009-01-29 Huber+Suhner Ag Protection contre la foudre et la surtension
DE102009019547A1 (de) * 2009-04-30 2010-11-11 Kathrein-Werke Kg Filteranordnung
DE102009031373A1 (de) * 2009-07-01 2011-01-05 Kathrein-Werke Kg Hochfrequenzfilter
US9614267B1 (en) * 2016-05-16 2017-04-04 Maury Microwave, Inc. Broadband RF capacitors for coaxial line

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE911627C (de) * 1951-08-09 1954-05-17 Int Standard Electric Corp Einrichtung zur Amplitudensteuerung
DE1052485B (de) * 1957-07-08 1959-03-12 Marconi Wireless Telegraph Co Drehkupplung fuer eine Koaxialleitung
US4616195A (en) * 1985-03-08 1986-10-07 Hughes Aircraft Company Coaxial phase shifter for transverse electromagnetic transmission line
DE19907413C1 (de) * 1999-02-20 2000-08-31 Forschungszentrum Juelich Gmbh Koaxialwellenleiter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577511A (en) * 1946-05-24 1951-12-04 Seymour B Cohn Tunable radio frequency filter
DE1062485B (de) 1958-01-15 1959-07-30 Westinghouse Bremsen Gmbh Pneumatische Vorrichtung zum Einstellen der Kraftstoffzufuhr von zwei auf eine gemeinsame Abtriebs-welle arbeitenden Brennkraftmaschinen
US3393384A (en) * 1964-08-28 1968-07-16 Nasa Usa Radio frequency coaxial high pass filter
US3939443A (en) * 1972-01-07 1976-02-17 Finommechanikai Vallalat Frequency-selective coupling for high-frequency electromagnetic waves
US4303899A (en) * 1980-05-05 1981-12-01 The United States Of America As Represented By The Secretary Of The Army Matched high Q, high frequency resonators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE911627C (de) * 1951-08-09 1954-05-17 Int Standard Electric Corp Einrichtung zur Amplitudensteuerung
DE1052485B (de) * 1957-07-08 1959-03-12 Marconi Wireless Telegraph Co Drehkupplung fuer eine Koaxialleitung
US4616195A (en) * 1985-03-08 1986-10-07 Hughes Aircraft Company Coaxial phase shifter for transverse electromagnetic transmission line
DE19907413C1 (de) * 1999-02-20 2000-08-31 Forschungszentrum Juelich Gmbh Koaxialwellenleiter

Also Published As

Publication number Publication date
US20060170522A1 (en) 2006-08-03
CN1815801A (zh) 2006-08-09
US7348869B2 (en) 2008-03-25

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