EP0352685A1 - Breitband-Hohlleiterfilter - Google Patents

Breitband-Hohlleiterfilter Download PDF

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Publication number
EP0352685A1
EP0352685A1 EP89113554A EP89113554A EP0352685A1 EP 0352685 A1 EP0352685 A1 EP 0352685A1 EP 89113554 A EP89113554 A EP 89113554A EP 89113554 A EP89113554 A EP 89113554A EP 0352685 A1 EP0352685 A1 EP 0352685A1
Authority
EP
European Patent Office
Prior art keywords
susceptances
filter according
inductive
input
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.)
Ceased
Application number
EP89113554A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Cruchon
Jean-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 CIT SA
Original Assignee
Alcatel Telspace SA
Alcatel Transmission par 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 Telspace SA, Alcatel Transmission par Faisceaux Hertziens SA filed Critical Alcatel Telspace SA
Publication of EP0352685A1 publication Critical patent/EP0352685A1/de
Ceased 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure

Definitions

  • the invention relates to a wide band waveguide filter.
  • inductive susceptances can be achieved in different ways; for example : - a rod, - a curtain of rods, - a selfic section, - a plane obstacle E.
  • the reception bands are widening.
  • the whole band 10.7 - 12.75 GHz is accessible for temperatures input noise less than 150 ° K or even 130 ° K.
  • duplex links which are carried out, need to be protected from disturbers.
  • This is lower than 2 wo (wo - 2 fo, fo central frequency of the first passband) due to variation in the wavelength ⁇ g and that of the coupling susceptances. It leads to a deterioration of the out-of-band attenuation (higher attenuation sought).
  • the number of cavities is increased until rejection is obtained, neglecting the exponential increase in time and the difficulties associated with the adjustment.
  • One such obstacle consists of a rectangular block which forms a U-shaped guide section, in the rectangular waveguide (TEO1), terminated by straight section discontinuities.
  • the invention aims to overcome the drawbacks described above by using such a thick obstacle.
  • the invention proposes, in fact, a broadband waveguide filter comprising an inductive susceptance input and an inductive susceptance output, characterized in that it comprises a series of regularly distributed inductive susceptances and a series of susceptances capacitive located at equal distance from each of them, and two thick metallic obstacles placed respectively between the two extreme susceptances and the ends of the guide at approximately ⁇ g / 4 of these susceptances ( ⁇ g; guided wavelength).
  • the filter of the invention comprises a series of regularly distributed inductive susceptances, each produced by a curtain of two vertical rods arranged in a transverse plane of the guide, a tuning screw, corresponding to two rods, being positioned in the same plane. transverse than the rods, parallel to these in a median longitudinal plane, and a series of capacitive susceptances each consisting of a tuning screw located between two tuning screws of two successive inductive susceptances at equal distance from each of they.
  • FIGS. 1 and 2 represent an embodiment of the filter of the invention which comprises: a waveguide 10, here topped with a reinforcement bar 11, and terminated at its two ends by two fixing flanges 12 and 13, - A series of regularly distributed inductive susceptances each produced by a curtain of two vertical rods 14 arranged in a transverse plane of the guide, a matching screw 15 corresponding to two rods located in a median longitudinal plane, parallel to said rods, being positioned in the same transverse plane as the rods.
  • a series of capacitive susceptances each consisting of a tuning screw 16 located between two tuning screws 15 of two successive inductive susceptances at equal distance from each of them, - Two thick obstacles 17 disposed respectively between the two extreme susceptances (14,15) and the ends of the guide at approximately ⁇ g / 4 of these susceptances ( ⁇ g: guided wavelength), on the opposite part of the waveguide to the one that supports the tuning screws.
  • the filter of the invention therefore uses at each end a thick obstacle 17 and a compensation screw 15 (that of the nearest inductive susceptance) to jointly adjust the R.O.S. out-of-band access and rejection.
  • a rectangular guide 10 having the following characteristics is used: - length: 200 mm; - width: 19.05 mm; - height: 9.52 mm; - selfic susceptances (15,14) 13 in number - capacitive susceptances (16) 12 in number.
  • two compensation studs are used, as shown in FIGS. 3 and 4, which include three parts 20, 21 and 22 located along an axis of symmetry ⁇ : - two end parts 20, 22 cylindrical, one of which 20 is introduced into a hole made in the guide, - A central cylindrical part 21, of diameter greater than that of the other two parts, and which comprises two flats 23 and 24 arranged symmetrically with respect to the axis of symmetry of said stud, these flats being positioned parallel to the opening of the guide.
  • FIGS. 5 and 6 respectively illustrate the band response curve of the filter without (26) obstacles and with (27) compensation obstacles, and the adaptation curve in the band without (28 ) obstacles and with (29) compensation obstacles.

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  • Control Of Motors That Do Not Use Commutators (AREA)
EP89113554A 1988-07-28 1989-07-24 Breitband-Hohlleiterfilter Ceased EP0352685A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8810213A FR2634949B1 (fr) 1988-07-28 1988-07-28 Filtre large bande en guide d'onde
FR8810213 1988-07-28

Publications (1)

Publication Number Publication Date
EP0352685A1 true EP0352685A1 (de) 1990-01-31

Family

ID=9368891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113554A Ceased EP0352685A1 (de) 1988-07-28 1989-07-24 Breitband-Hohlleiterfilter

Country Status (2)

Country Link
EP (1) EP0352685A1 (de)
FR (1) FR2634949B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766641A (en) * 1953-08-14 1957-01-23 Standard Telephones Cables Ltd Improvements in electrical waveguide filters
FR1600400A (de) * 1968-12-26 1970-07-20
EP0167302A2 (de) * 1984-06-07 1986-01-08 Spar Aerospace Limited Antennenspeiseschaltungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766641A (en) * 1953-08-14 1957-01-23 Standard Telephones Cables Ltd Improvements in electrical waveguide filters
FR1600400A (de) * 1968-12-26 1970-07-20
EP0167302A2 (de) * 1984-06-07 1986-01-08 Spar Aerospace Limited Antennenspeiseschaltungen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-29, no. 4, avril 1981, pages 364-371, IEEE, New York, US; R.V. SNIJDER: "Stepped-ferrite tunable evanescent filters *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 129 (E-403)[2186], 14 mai 1986; & JP-A-60 261 201 (NIPPON DENKI K.K.) 24-12-1985 *

Also Published As

Publication number Publication date
FR2634949B1 (fr) 1991-01-04
FR2634949A1 (fr) 1990-02-02

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