EP0072729B1 - Filtre coupe-bande à structure coaxiale - Google Patents

Filtre coupe-bande à structure coaxiale Download PDF

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Publication number
EP0072729B1
EP0072729B1 EP82401444A EP82401444A EP0072729B1 EP 0072729 B1 EP0072729 B1 EP 0072729B1 EP 82401444 A EP82401444 A EP 82401444A EP 82401444 A EP82401444 A EP 82401444A EP 0072729 B1 EP0072729 B1 EP 0072729B1
Authority
EP
European Patent Office
Prior art keywords
resonators
filter
coaxial
coaxial waveguide
guide
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
Application number
EP82401444A
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German (de)
English (en)
French (fr)
Other versions
EP0072729A1 (fr
Inventor
Jacques Delaballe
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 Thomson Faisceaux Hertziens SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
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 Thomson Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0072729A1 publication Critical patent/EP0072729A1/fr
Application granted granted Critical
Publication of EP0072729B1 publication Critical patent/EP0072729B1/fr
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

Definitions

  • the present invention relates to a microwave filter comprising a coaxial waveguide closed at its two ends and n dielectric resorators arranged in the coaxial waveguide.
  • the resonators are each arranged on one side of the internal conductor of the waveguide, generally the same side for all the resonators, and are made integral with the internal wall of the external conductor, for example by a support. fixed to this wall or by a screw for adjusting the position of the resonator, a screw which passes through the external conductor of the coaxial waveguide.
  • Known notch filters have the drawback of not cutting a wide frequency band.
  • the object of the present invention is to remedy this defect by proposing notch filters with a bandwidth clearly greater than the bandwidth of known filters.
  • the invention proposes a microwave filter comprising a coaxial waveguide ' closed at its two ends and n dielectric resonators (n positive integer) arranged in the coaxial guide, the resonators being of homogeneous structure and being drilled through in part, a hole through which the internal conductor of the coaxial guide passes, characterized in that, the filter being a notch filter, a mode TM 011 ensures the coupling between the guide and the resonators, that, for n > 1, the distance between two successive resonators is of the order of 3/4 A where ⁇ is the wavelength corresponding to the average frequency of the band cut by the filter, and in that the filter comprises means d 'isolation, to electrically isolate the resonators of the internal and external conductors of the coaxial waveguide, which are spacers of dielectric material with low permittivity, interposed between each resonator and one of these two conductors of the coaxial waveguide.
  • this filter is very different from the filter according to the invention; indeed it is a bandpass filter and, if the resonators are well crossed by the internal conductor of a coaxial guide, on the other hand their structure is heterogeneous and they are in electrical contact with the two conductors of the coaxial guide ; moreover, while in the present invention the resonators are practically only coupled to the coaxial guide in which they behave like plug circuits to bring about a notch function, in the text IEEE the resonators are capacitively coupled, achieving a series connection which provides a bandpass function.
  • the filter according to FIG. 1 is produced from a coaxial waveguide 1, of longitudinal axis YY, the internal conductor 10 of which is connected, at its two ends, respectively to the internal conductors, 60, 70, of two coaxial sockets 6 and 7.
  • the external conductor 11 of the coaxial guide has, at its ends, the section of its internal wall which is decreasing; thus two adaptation sections are formed, 12, 13, to adapt the impedance of the guide to that of the coaxial conductors to which it is intended to be connected by its sockets 6 and 7.
  • This external conductor 11 is in fact made up of two parts symmetrical with respect to the plane of Figure 1; one, 110 of these two parts appears in Figure 1 while the other has, as indicated above, been removed to show the interior of the filter.
  • Two plates, 4, 5, seen in section along a plane which is the plane of FIG. 1, are respectively pierced with two holes 40, 60 through which the internal conductors of the sockets 6, 7 pass; these two plates are screwed at the end of the guide.
  • the sockets 6 and 7, they are themselves respectively screwed into the plates 4, 5, thus forming, with these plates and the external conductor 11 of the guide 1, a closed housing whose internal surfaces are silver.
  • Two dielectric resonators 2, 3 of homogeneous structure, made of zirconium titanate with permittivity 36 provide a band-cutting function in the coaxial guide 1.
  • These resonators are in the form of hollow cylinders with an external diameter substantially equal to three times the diameter of their inner hole and double their thickness.
  • These resonators are arranged so that their longitudinal axis coincides with the longitudinal axis YY of the coaxial waveguide 1. that is to say so that the internal conductor of the waveguide passes through the hole resonators.
  • Two spacers 20, 30, made of organic glass of permittivity 2, in the form of a cylindrical sleeve, are interposed between the internal conductor 10 of the guide 1 and, respectively, the resonators 2 and 3.
  • the resonators 2 and 3 are not in contact with the external conductor 11 of the coaxial guide 1 and a material of low permittivity (spacers 20 and 30) is interposed between each of them and the conductor internal 10 of the guide; this arrangement is intended to minimize losses by Joule effect in the filter, it being understood that it is possible to produce filters according to the invention where the resonators are in contact with one or the other or both conductors of the guide coaxial.
  • FIG. 2 have also been shown, in dashed lines with an arrow, the lines of the magnetic field, H, which correspond to the propagation according to the mode TM o11 in the coaxial guide and which ensure the coupling between the guide and the resonators when they are at their resonant frequency.
  • the distance between the resonators is of the order of 3/4 A where is the wavelength corresponding to the frequency average of the band cut by the filter with coaxial structure.
  • the filter which has been described with the aid of FIGS. 1 and 2 has an overall length of approximately 15.5 cm.
  • This filter makes it possible to obtain a loss of 56 decibels in a 400 MHz band centered on a frequency of 3 850 MHz.
  • the bandwidth of the notch filter according to FIGS. 1 and 2 can be modified by changing the coupling between the resonators and the coaxial waveguide; this change can be obtained by modifying the diameter of the internal hole of the resonators: the closer this diameter is to that of the internal conductor of the coaxial waveguide, the greater the width of the cut strip.
  • the filter may have only one resonator or may have three or more; in the latter case two consecutive resonators will be approximately 3/4 X apart, ⁇ being, as indicated above, the wavelength, in free space, corresponding to the average frequency of the band cut by the filter.
  • the spacers 20, 30 interposed between the resonators 2, 3 and the internal conductor 10 can, for example, be replaced by spacers arranged between the resonators and the external conductor 11 of the coaxial guide.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP82401444A 1981-08-14 1982-07-30 Filtre coupe-bande à structure coaxiale Expired EP0072729B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115763 1981-08-14
FR8115763A FR2511548A1 (fr) 1981-08-14 1981-08-14 Filtre coupe-bande a structure coaxiale

Publications (2)

Publication Number Publication Date
EP0072729A1 EP0072729A1 (fr) 1983-02-23
EP0072729B1 true EP0072729B1 (fr) 1987-12-02

Family

ID=9261483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401444A Expired EP0072729B1 (fr) 1981-08-14 1982-07-30 Filtre coupe-bande à structure coaxiale

Country Status (3)

Country Link
EP (1) EP0072729B1 (enExample)
DE (1) DE3277792D1 (enExample)
FR (1) FR2511548A1 (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354795B (zh) * 2011-08-03 2014-06-11 广东威特真空电子制造有限公司 一种高功率微波传输天线
CN115714245B (zh) * 2021-08-23 2025-09-19 华为技术有限公司 一种滤波器、天线、基站以及滤波器的制造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2877433A (en) * 1954-11-01 1959-03-10 Tobe Deutschmann Corp Coaxial filter
US3840828A (en) * 1973-11-08 1974-10-08 Bell Telephone Labor Inc Temperature-stable dielectric resonator filters for stripline
DE2538614C3 (de) * 1974-09-06 1979-08-02 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto (Japan) Dielektrischer Resonator

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CONFERENCE PROCEEDINGS 7TH EUROPEAN MICROWAVE CONFERENCE, 5-8 septembre 1977, Copenhagen, SEVENOAKS (GB); M.W.POSPIESZALSKI: "Cylindrical dielectric resonators and their applications in TEM-line microwave circuits", pages 168-172 *
IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, 27-29 juin 1978, Ottawa, IEEE, 1978, PISCATAWAY (US); K.WAKINO et al.: "Miniaturized band pass filters using half wave dielectric resonators with improved spurious response", pages 230-232 *
IEEE TRANSACTIONS ON MTT, vol.12, no.1, janvier 1965, New York (US); B.M.SCHIFFMAN et al.: "Exact design of band-stop microwave filters", pages 6-15 *

Also Published As

Publication number Publication date
FR2511548A1 (fr) 1983-02-18
EP0072729A1 (fr) 1983-02-23
FR2511548B1 (enExample) 1984-12-14
DE3277792D1 (en) 1988-01-14

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