EP0813266A2 - Filtre hyperfréquence comprenant plusieurs résonateurs coaxiaux - Google Patents

Filtre hyperfréquence comprenant plusieurs résonateurs coaxiaux Download PDF

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Publication number
EP0813266A2
EP0813266A2 EP96121008A EP96121008A EP0813266A2 EP 0813266 A2 EP0813266 A2 EP 0813266A2 EP 96121008 A EP96121008 A EP 96121008A EP 96121008 A EP96121008 A EP 96121008A EP 0813266 A2 EP0813266 A2 EP 0813266A2
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EP
European Patent Office
Prior art keywords
coupling
coaxial resonators
main
resonators
microwave 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.)
Withdrawn
Application number
EP96121008A
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German (de)
English (en)
Other versions
EP0813266A3 (fr
Inventor
Ulrich Dipl.-Ing. Zinn
Uwe Dipl.-Ing. Rosenberg
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0813266A2 publication Critical patent/EP0813266A2/fr
Publication of EP0813266A3 publication Critical patent/EP0813266A3/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a microwave filter consisting of a plurality of coaxial resonators, with main couplings between all electrically adjacent coaxial resonators and at least one coupling between two electrically non-adjacent coaxial resonators being provided.
  • Microwave filters whose resonance circuits are only coupled sequentially from the input to the output - that is, there are only main couplings between electrically adjacent resonance circuits - offer very limited possibilities with regard to the implementation of filter characteristics (e.g. Tschebyscheff, power filter characteristics).
  • Filter characteristics e.g Cauer
  • Filter characteristics which have damping poles in the selection area and a constant group delay in the transmission area, have the advantage that they can be realized with a lower degree of filtering.
  • one or more overcouplings between electrically non-adjacent resonance circuits are additionally provided.
  • a microwave filter consisting of a plurality of coaxial resonators, which is described at the outset and which, in addition to the main couplings, also has at least one coupling between electrically non-adjacent coaxial resonators, is described in IEEE Transactions on Microwave Theory and Techniques, September 1982, volume MTT-30, p. 1300-1311 known.
  • the skin couplings between electrically adjacent resonators are inductive here, the degree of coupling being determined by the distance between the coaxial resonators to be coupled and by the geometry of the coupling diaphragms between the coaxial resonators.
  • the invention is therefore based on the object of specifying a microwave filter of the type mentioned in the introduction, in which the influence of parsitary couplings on the desired filter characteristic is reduced as much as possible.
  • this object is achieved according to claim 1 in that at least one main coupling is capacitive in the vicinity of the coupling.
  • This type of coupling requires only a small coupling opening, which largely excludes the parasitic couplings mentioned. Therefore, an almost symmetrical cauer characteristic can be realized with the microwave filter.
  • the filter has good selection properties beyond 1.5 times the filter center frequency.
  • the four resonant circuits of the filter R1, R2, R3 and R4 are coaxial resonators which, in a known manner, consist of cavities 1, 2, 3, 4 with inner conductors 5, 6, 7, 8 arranged therein. Partitions 9, 10 and 11 separate the cavities 1, 2, 3 and 4 so that a pleated filter structure is created.
  • the coaxial resonators 1, 5; 2, 6; 3, 7; 4, 8 a sequential signal path with a coaxial coupling 12 into the cavity 1 and a coaxial coupling 13 out of the cavity 4 in accordance with the ascending sequence of digits.
  • the main coupling between the electrically adjacent coaxial resonators that is to say the coaxial resonators which are sequentially in accordance with their numbering.
  • the main coupling between the coaxial resonator 1, 5 and the coaxial resonator 2, 6 is inductive and consists of an opening made in the partition 10.
  • the main inductive coupling between the coaxial resonator 3, 7 and the coaxial resonator 4, 8 consists of an opening 11 'embedded in the partition 11.
  • the main coupling between the coaxial resonator 2, 6 and the coaxial resonator 3, 7 is capacitive; it consists of a probe 14 which projects through an opening 15 in the partition 9 into the two adjacent cavities 2 and 3.
  • the capacitive coupling probe 14 can be held in the opening 15 by a dielectric. Since this capacitive coupling only requires a relatively small opening 15 in the partition 9, there are fewer parasitic couplings between the coaxial resonators 1, 5 and 3, 7 or between coaxial resonators 2, 6 and 4, 8.
  • the two electrically non-adjacent coaxial resonators 1, 5 and 4, 8 are arranged geometrically next to one another. This makes it easy to implement a coupling between these two coaxial resonators.
  • This coupling is implemented inductively and as an opening 16 in the partition 9 between the two coaxial resonators 1, 5 and 4, 8.
  • This opening 16 for the overcoupling does not require a large extension, so that it also causes almost no parasitic coupling.
  • FIG. 3 shows a coupling scheme for the 4-circuit filter described above. So there is a negative coupling -K iI between the input I and the first resonance circuit R1, there is a main inductive coupling K 12 between the resonance circuits R1 and R2, there is a capacitive main coupling -K 23 between the resonance circuits R2 and R3 and between the resonance circuits R3 and R4 there is an inductive main coupling K 34 . There is a negative coupling -K 4O from the fourth resonance circuit R4 to the output O. The inductive coupling between the first resonance circuit R1 and the fourth resonance circuit R4 is denoted by K 14 .
  • parasitic couplings in the case of higher-circuit filters can also be reduced very greatly by capacitively coupling at least one main coupling in the vicinity of inductive coupling is realized.
  • the main coupling should be designed capacitively through which parasitic couplings are most likely to occur.
  • the main capacitive coupling is designed as a probe between the coaxial resonators to be coupled.
  • Such a coupling probe requires a contact-free bushing, which can be very small.
  • overcoupling generally requires a smaller coupling opening than a main coupling. All in all, there are no openings of such size in the partition walls that favor parasitic couplings.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP96121008A 1996-06-10 1996-12-31 Filtre hyperfréquence comprenant plusieurs résonateurs coaxiaux Withdrawn EP0813266A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996123144 DE19623144A1 (de) 1996-06-10 1996-06-10 Mikrowellenfilter, bestehend aus mehreren Koaxial-Resonatoren
DE19623144 1996-06-10

Publications (2)

Publication Number Publication Date
EP0813266A2 true EP0813266A2 (fr) 1997-12-17
EP0813266A3 EP0813266A3 (fr) 1998-10-07

Family

ID=7796550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96121008A Withdrawn EP0813266A3 (fr) 1996-06-10 1996-12-31 Filtre hyperfréquence comprenant plusieurs résonateurs coaxiaux

Country Status (2)

Country Link
EP (1) EP0813266A3 (fr)
DE (1) DE19623144A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1258941A2 (fr) * 2001-05-18 2002-11-20 Comtech S.r.l. Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123318A1 (de) * 2001-05-14 2002-12-05 Marconi Comm Gmbh Mikrowellenfilter
EP1732158A1 (fr) 2005-05-30 2006-12-13 Matsushita Electric Industrial Co., Ltd. Filtre à micro-ondes avec un résonateur coaxial couplé avec le paroi terminale
CN100505414C (zh) * 2006-01-04 2009-06-24 昇达科技股份有限公司 反相交叉耦合装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH532864A (de) * 1971-07-05 1973-01-15 Hirschmann Electric Anordnung mit koaxialen Topfkreisen, deren gegenseitige Kopplung einstellbar ist
DE2653856B1 (de) * 1976-11-26 1978-02-16 Siemens Ag Filter fuer sehr kurze elektromagnetische Wellen
JPS54103655A (en) * 1978-02-01 1979-08-15 Nec Corp Microwave band pass filter
US4890079A (en) * 1987-10-26 1989-12-26 Kokusai Denki Kabushiki Kaisha Di-electric bandpass filter
EP0525416A1 (fr) * 1991-07-29 1993-02-03 ANT Nachrichtentechnik GmbH Filtre hyperfréquence
US5202653A (en) * 1990-04-17 1993-04-13 Murata Manufacturing Co., Ltd. Band-pass filter including resonance elements coupled by a coupling line and a by-pass coupling line

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329057A1 (de) * 1983-08-11 1985-02-28 Siemens AG, 1000 Berlin und 8000 München Koaxialleitungs-, kammleitungs- oder interdigitalfilter mit wenigstens vier resonatoren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH532864A (de) * 1971-07-05 1973-01-15 Hirschmann Electric Anordnung mit koaxialen Topfkreisen, deren gegenseitige Kopplung einstellbar ist
DE2653856B1 (de) * 1976-11-26 1978-02-16 Siemens Ag Filter fuer sehr kurze elektromagnetische Wellen
JPS54103655A (en) * 1978-02-01 1979-08-15 Nec Corp Microwave band pass filter
US4890079A (en) * 1987-10-26 1989-12-26 Kokusai Denki Kabushiki Kaisha Di-electric bandpass filter
US5202653A (en) * 1990-04-17 1993-04-13 Murata Manufacturing Co., Ltd. Band-pass filter including resonance elements coupled by a coupling line and a by-pass coupling line
EP0525416A1 (fr) * 1991-07-29 1993-02-03 ANT Nachrichtentechnik GmbH Filtre hyperfréquence

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
G PFITZENMAIER: "LINEAR PHASE MICROWAVE BANDPASS FILTERS" PROCEEDINGS OF THE 1973 EUROPEAN MICROWAVE CONFERENCE, 4. - 7. September 1973, Seite B.2.1. XP002073863 Gent (BE) *
PATENT ABSTRACTS OF JAPAN vol. 3, no. 125 (E-145), 19. Oktober 1979 & JP 54 103655 A (NIPPON DENKI K.K.), 15. August 1979 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1258941A2 (fr) * 2001-05-18 2002-11-20 Comtech S.r.l. Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF
EP1258941A3 (fr) * 2001-05-18 2003-08-27 Comtech S.r.l. Filtre ordre minimal avec cavités couplées pour canaux de télévision UHF

Also Published As

Publication number Publication date
EP0813266A3 (fr) 1998-10-07
DE19623144A1 (de) 1997-12-11

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