EP0164050A1 - Filter mit einem Haupthohlleiter der durch mehrere Nebenhohlleiter belastet ist - Google Patents

Filter mit einem Haupthohlleiter der durch mehrere Nebenhohlleiter belastet ist Download PDF

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Publication number
EP0164050A1
EP0164050A1 EP85106515A EP85106515A EP0164050A1 EP 0164050 A1 EP0164050 A1 EP 0164050A1 EP 85106515 A EP85106515 A EP 85106515A EP 85106515 A EP85106515 A EP 85106515A EP 0164050 A1 EP0164050 A1 EP 0164050A1
Authority
EP
European Patent Office
Prior art keywords
guides
main guide
guide
filter
rectangular
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
EP85106515A
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English (en)
French (fr)
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EP0164050B1 (de
Inventor
Jean-Claude Cruchon
Denis Schubert
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
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Filing date
Publication date
Application filed by Alcatel Thomson Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0164050A1 publication Critical patent/EP0164050A1/de
Application granted granted Critical
Publication of EP0164050B1 publication Critical patent/EP0164050B1/de
Expired 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
    • H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies

Definitions

  • the present invention relates to a filter comprising a main waveguide, the two ends of which are coupled to the two ports of the filter, and also comprising at least one lateral guide which opens, at one of its ends, into a hole drilled in the wall of the main guide and which is generally loaded, at its other end, with an absorbent material.
  • Such filters are known and are, for example, plugged into the output switches of power amplifiers working in centimeter waves, so as to reduce the level of harmonics radiated in space.
  • Known filters are produced by means of a rectangular main guide whose four sides, or at least one of the two long sides, are loaded by lateral guides, which are also rectangular but of smaller cross section than that of the main guide.
  • These filters sometimes include, at their two accesses, an impedance adapter of the progressive fitting type (type in Anglo-Saxon literature) or of the discontinuous fitting type in steps (steps in Anglo-Saxon literature); this impedance adapter, which constitutes a rectangular guide fitting, rectangular guide, is intended to increase the coupling of the lateral guides by reducing the distance between the two long sides of the main guide, that is to say by taking, for the guide main, an internal section whose short sides are smaller than those of the filter connection ports; the long sides, on the other hand, keep the same dimension as the long sides of the external rectangular guides to which the filter is connected.
  • the object of the present invention is to avoid or at least reduce these drawbacks.
  • a filter comprising a rectangular main guide, n secondary guides with n integer at least equal to 1, coupled at one of their ends, to the main guide by holes passing through the wall of the main guide, and two adapters d impedance of the rectangular guide-rectangular guide connection type, respectively coupled to the two ends of the main guide, is characterized in that the n secondary guides are cylindrical guides and in that the impedance transformers have, at their ends, sections internal rectangulars of which both the length and the width are smaller on the side coupled to the main guide than on the side opposite the main guide.
  • Figure 1 shows a filter according to the invention in partial side view with a part shown in broken away.
  • the secondary guides of the filter open into guide 1 through circular holes of a diameter of 5.38 mm, equal to the inside diameter of the guides, except for the first five and the last five guides of each alignment, for which the couplings are of a smaller diameter so as not to capture too large a fraction of the energy of the main guide, 1. In each alignment and from each of the ends of the alignment, the five.
  • first holes have respective diameters of 4.16, 4.40, 4.67 and 4.95 mm; thus, from the filter ports, the couplings of the secondary gulds are progressively increasing, which reduces the power applied to the first loads and makes it possible to avoid destroying them when the input power is high; as this progressive growth of the couplings of the secondary guides is found on each side of the filter, the two ports of the filter can serve as inlet access since there is no need to choose one rather than the other for reasons for power dissipation in the first charges.
  • the thirty other secondary guides of each claim being all identical to each other and emerging through identical holes in the guide 1, the middle part of the filter in FIG. 1 has not been drawn so that, depending on the space available for Figure 1, the parts shown are drawn to a scale allowing a good understanding of their details.
  • Figure 3 is a cross section of the filter of Figures 1 and 2, at the height of the eighth side assembly, counting from the left end in Figure 1; this section shows the six secondary guides A8, B8, C8, D8, E8, F8 with their respective loads La8,; Lb8, Lc8, Ld8, Le8, Lf8 and their covers G, H, 1, J. The charges are fixed in the covers by gluing.
  • the filter which has just been described is a harmonic filter 2, intended to pass a fundamental frequency between 17.3 and 18.1 GHz. Its performance, for a test power of 1.3 kW, is as follows: for the fundamental the losses are 0.11 dB and the standing wave ratio is 1.035 while for a harmonic 2 of between 34, 6 and 36.2 GHz losses are greater than 50 dB and the standing wave ratio is 1.23.
  • the sections are important, since it is no longer possible to reduce a thickness without reducing a width, and this results in significant discontinuities in the wall of the main guide; these discontinuities lead to an artificial widening of the main guide; therefore, the cutoff frequency of the first two parasitic modes TE01 and TE02 is lowered, which creates parasitic resonances which appear, in particular, in the band 17.3 - 18.1 GHz.
  • the main guide of the filter can be associated with secondary guides for me only by its two long sides or even by only one of its long sides.
  • the number of secondary guides if it must at least be equal to 1, is limited only by the space available for the filter; moreover, it is possible to fill the secondary guides with dielectric in order to reduce their section without increasing their cut-off frequency; it is also possible to distribute the secondary guides in different ways along the main guide and, in particular, the reprartitian may not be regular.
  • the impedance adapters at the filter ports such as 2 and 4 in FIG. 1, they can be of the progressive fitting or discontinuous fitting type.

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EP85106515A 1984-05-30 1985-05-28 Filter mit einem Haupthohlleiter der durch mehrere Nebenhohlleiter belastet ist Expired EP0164050B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408496A FR2565416B1 (fr) 1984-05-30 1984-05-30 Filtre du type guide d'ondes principal charge par des guides d'ondes lateraux
FR8408496 1984-05-30

Publications (2)

Publication Number Publication Date
EP0164050A1 true EP0164050A1 (de) 1985-12-11
EP0164050B1 EP0164050B1 (de) 1989-03-22

Family

ID=9304547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106515A Expired EP0164050B1 (de) 1984-05-30 1985-05-28 Filter mit einem Haupthohlleiter der durch mehrere Nebenhohlleiter belastet ist

Country Status (5)

Country Link
US (1) US4578657A (de)
EP (1) EP0164050B1 (de)
JP (1) JPS612401A (de)
DE (1) DE3569068D1 (de)
FR (1) FR2565416B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771857A1 (fr) * 1997-12-03 1999-06-04 Thomson Csf Filtre hyperfrequence a flanc superieur raide

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04348126A (ja) * 1991-03-15 1992-12-03 Ube Ind Ltd ポリエーテルスルホン溶融物の製造方法
US6652990B2 (en) * 1992-03-27 2003-11-25 The Louis Berkman Company Corrosion-resistant coated metal and method for making the same
JPH0666105U (ja) * 1993-02-12 1994-09-16 島田理化工業株式会社 導波管形ローパスフィルタ
JP2007158713A (ja) * 2005-12-05 2007-06-21 Shimada Phys & Chem Ind Co Ltd 同軸フィルタ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252509A (fr) * 1960-03-31 1961-01-27 Thomson Houston Comp Francaise Filtre pour hyperfréquences
DE2004730A1 (de) * 1969-03-03 1970-09-24 The Marconi Company Ltd., London Hohlleiter-Bandsperre
FR2143780A1 (de) * 1971-06-28 1973-02-09 Siemens Ag
US4060778A (en) * 1976-07-12 1977-11-29 Microwave Research Corporation Microwave harmonic absorption filter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187277A (en) * 1962-05-14 1965-06-01 Airtron Inc Waveguide harmonic suppressor employing subsidiary waveguides, cut off for fundamental, for coupling main waveguide harmonics to absorber
US3593220A (en) * 1968-07-15 1971-07-13 Varian Associates High power microwave low-pass filter of the leaky wall type
US3543199A (en) * 1968-10-03 1970-11-24 Us Air Force Tapered mode selective absorber for use in high power waveguide systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252509A (fr) * 1960-03-31 1961-01-27 Thomson Houston Comp Francaise Filtre pour hyperfréquences
DE2004730A1 (de) * 1969-03-03 1970-09-24 The Marconi Company Ltd., London Hohlleiter-Bandsperre
FR2143780A1 (de) * 1971-06-28 1973-02-09 Siemens Ag
US4060778A (en) * 1976-07-12 1977-11-29 Microwave Research Corporation Microwave harmonic absorption filter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
1976 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, 14 -16 juin 1976, Cherry Hill, pages 122-124, Digest of Technical Papers, IEEE, New York, US; R.V. SNYDER: "An improved low-pass harmonic absorber" *
TELECOMMUNICATION AND RADIO ENGINEERING, vol. 33/34, no. 1, janvier 1979, pages 62-65, Scripta Publishing Co., Washington, US; V.I. VOL'MAN et al.: "Absorption-type filter for high-power levels" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771857A1 (fr) * 1997-12-03 1999-06-04 Thomson Csf Filtre hyperfrequence a flanc superieur raide
EP0921587A1 (de) * 1997-12-03 1999-06-09 Thomson-Csf Mikrowellenfilter mit steiler Oberflanke

Also Published As

Publication number Publication date
FR2565416A1 (fr) 1985-12-06
US4578657A (en) 1986-03-25
JPS612401A (ja) 1986-01-08
DE3569068D1 (en) 1989-04-27
EP0164050B1 (de) 1989-03-22
FR2565416B1 (fr) 1987-06-26

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