EP0835533B1 - Filtre pour guide d'ondes - Google Patents

Filtre pour guide d'ondes Download PDF

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Publication number
EP0835533B1
EP0835533B1 EP96922868A EP96922868A EP0835533B1 EP 0835533 B1 EP0835533 B1 EP 0835533B1 EP 96922868 A EP96922868 A EP 96922868A EP 96922868 A EP96922868 A EP 96922868A EP 0835533 B1 EP0835533 B1 EP 0835533B1
Authority
EP
European Patent Office
Prior art keywords
waveguide
ind
guide structure
waveguide filter
frequency
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 - Lifetime
Application number
EP96922868A
Other languages
German (de)
English (en)
Other versions
EP0835533A1 (fr
Inventor
Stefan Rust
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.)
Airbus Defence and Space GmbH
Original Assignee
DaimlerChrysler Aerospace AG
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 DaimlerChrysler Aerospace AG filed Critical DaimlerChrysler Aerospace AG
Publication of EP0835533A1 publication Critical patent/EP0835533A1/fr
Application granted granted Critical
Publication of EP0835533B1 publication Critical patent/EP0835533B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/024—Transitions between lines of the same kind and shape, but with different dimensions between hollow waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • the invention relates to a waveguide filter according to the preamble of claim 1.
  • the design of waveguide screens is based on the known theorys of waveguide aperture technology (Waveguide Handbook, N. Marcuwitz, Mc Graw-Hill Book Company INC., Edition 1986).
  • the waveguide apertures are as planar Structures with e.g. circular, slit or H-shaped Aperture openings are formed and in a cross-sectional plane an elongated waveguide perpendicular to the waveguide axis between a dining and a continuing Section of the waveguide used.
  • Bandpass filters are used, the apertures at Natural resonance operated, which is known for slit-shaped Apertures in an electrically effective Slot length of half a wavelength of the useful frequency is set. With the slot width is the transmittance T determined by slit-shaped apertures.
  • the high-conductor screens designed as bandpass filters have only one of the resonance curve outside its pass band corresponding damping curve.
  • these bandpass filters generally no targeted Blocking of certain interfering frequency multiples of the Usable frequency possible.
  • the known bandpass filters be supported with additional filter measures. In many cases, such as with small devices or with Sensors disturb the required volume of the known Bandpass filter.
  • the manufacturing costs for FIN ladders with Resonance structures are relatively high.
  • a waveguide filter is known from EP 0 029 276 A1, which consists of four planar conductor structures interacting in the waveguide field, which in the wall of a waveguide fed by a transmitter is integrated.
  • the Conductor structures are in a cross-sectional plane on the circumference of the waveguide integrated into the wall at 90 ° to each other and each feed in a further waveguide section.
  • a central aperture that is self-resonant for a transmission frequency is designed, two identically designed apertures for the suppression of Interference frequencies are formed. These apertures are on one long side of the central aperture arranged so that they are in relation to their longitudinal extent do not lie centrally on the axis of symmetry of the conductor structure, which are parallel to the Field strength vectors run.
  • the object of the invention is to provide a bandpass filter for waveguides that additionally serves as a blocking filter for the targeted suppression of interference frequencies.
  • the invention has the advantage that the transmission of a Usable frequency and a targeted suppression of interference frequencies with a single component with little effort is possible.
  • manufacturing tolerances can be achieved with little effort comply and it only requires a small installation depth. Due to its symmetrical structure, the interference mode excitation minimal.
  • FIG. 1 shows the conductor structure 2 of a waveguide filter, on the cross-sectional area of a rectangular Waveguide 1 is placed.
  • the conductor structure 2 is in a metal layer on a planar, one-sided metallized, dielectric substrate formed.
  • the apertures 3, 4 are short-circuited on both sides Slit ladder-shaped and parallel to each other and perpendicular to the vectors 5 of the adjacent one Waveguide E field arranged.
  • the electrically effective The length of the centrally arranged slot conductor is one half the wavelength of the transmission frequency f (ind O) and the electrically effective length of the assigned slot conductor is half a wavelength each to be blocked Interference frequency f (ind S1) of the waveguide filter.
  • the slot conductors dimensioned in this way are for the assigned frequencies in natural resonance and radiate with maximum performance in the adjoining secondary Section of the waveguide 1.
  • the effect according to the invention can optionally also be achieved be if the centrally located slot conductor only a slot conductor in the manner described above assigned.
  • the assignment of two slot conductors but the advantage that due to the symmetrical structure of the waveguide filter, the interference mode excitation is minimal.
  • An arrangement of the two assigned also contributes to this Slot conductor near the border 6 of the waveguide interior at.
  • the assignment of the transmission and to blocking interference frequency to apertures 3 and 4 can also be inverted so that the centrally located Aperture 3 on the interference frequency f (ind S1) and the assigned aperture 4 to the transmission frequency f (ind O) are designed.
  • FIG. 2a to FIG. 2c show the transmission curves of the Waveguide filter according to FIG. 1.
  • FIG. 2a is the transmission curve of the centrally arranged slot conductor shown
  • FIG. 2b shows the transmission curve of the interacting assigned slot conductor
  • FIG. 2c the Transmission curve of all superimposed slot conductor fields of the waveguide filter.
  • the distance between the conductor structures 2 is one quarter of the wavelength of the transmission frequency f (ind O).
  • the natural resonances of the assigned slot conductors a conductor structure 2 are at a first interference frequency f (ind S1) and that of the second conductor structure to one second interference frequency f (ind S2).
  • the natural resonances the centrally arranged slot conductors are in two conductor structures on the transmission frequency f (ind C).
  • FIG. 4a shows the transmission curve of one of the central arranged slot conductor.
  • Figures 4b and 4c show assigned the transmission curves of the two interacting Slot conductor of a conductor structure for the respective Interference frequency.
  • FIG. 4d shows the transmission curve of the entire two-circuit waveguide filter. In addition to the Blocking effects at the interference frequencies f (ind S1) and f (ind S2) the curve shows a flattening in the transmission area around the frequency f (ind O).
  • the waveguide filter according to the invention can also be used for Form waveguides with other cross-sectional shapes, wherein make sure that the slotted conductor is perpendicular aligned the vectors 5 of the adjacent waveguide E field are.
  • the conductor structure 2 can be a metal foil, the Thickness is not greater than one eighth of the wavelength the highest interference frequency to be blocked. she can but also in a metal layer of a metalized on one side, dielectric substrate may be formed, wherein with increasing size of the dielectric constant of the Substrate the filter properties become worse.

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Abstract

L'objectif de l'invention est la création d'un filtre passe-bande destiné à un guide d'ondes, servant en outre de filtre d'arrêt pour la suppression ciblée de fréquences perturbatrices. Cet objectif est atteint, selon l'invention, par le fait qu'un écran de guide d'ondes comporte, en plus d'une ouverture centrale (3), deux ouvertures (4) de même conception, qui sont adaptées, en ce qui concerne la résonance propre, pour une fréquence perturbatrice f(ind S1) devant être arrêtée par le filtre du guide d'ondes et disposées symétriquement par rapport à l'ouverture centrale (3). Le filtre selon l'invention permet de satisfaire aux spécifications de fréquence légales avec les appareils à guide d'ondes et simultanément d'éliminer des fréquences perturbatrices.

Claims (9)

  1. Filtre pour guide d'ondes, qui est inséré sous la forme d'une structure à conducteurs planar dans un plan de coupe transversal d'un guide d'ondes allongé perpendiculairement à l'axe du guide d'ondes entre une partie d'alimentation et une partie de prolongement du guide d'ondes, possède une ouverture de diaphragme centrale, qui est conçue pour la résonance propre pour une fréquence de transmission choisie f(ind O) et qui comporte, en plus de l'ouverture de diaphragme centrale (3), des ouvertures de diaphragme (4) agencées de manière identique, parallèles et distantes l'une de l'autre, caractérisé en ce que les ouvertures de diaphragme (4) agencées de manière identique sont conçues pour la résonance propre pour une fréquence parasite f(ind S1) devant être bloquée par le filtre pour guide d'ondes, et que les ouvertures de diaphragme (3,4) sont disposées dans la structure à conducteurs (2) de telle sorte qu'elles sont situées, par rapport à leur étendue longitudinale, respectivement d'une manière centrée sur l'axe de symétrie de la structure à conducteurs (2), qui s'étend parallèlement aux vecteurs (5) d'intensité de champ.
  2. Filtre pour guide d'ondes, qui est agencé sous la forme d'une structure à conducteurs planar dans un plan de coupe transversal d'un guide d'ondes allongé perpendiculai-rement à l'axe du guide d'ondes entre une partie d'alimentation et une partie de prolongement du guide d'ondes, possède une ouverture de diaphragme centrale, qui est conçue pour la résonance propre pour une fréquence de transmission choisie f(ind O), caractérisé en ce que la structure à conducteurs (2) possède une ouverture du diaphragme (3) centrale, qui est conçue pour la résonance propre pour une fréquence parasite f(ind S1) devant être bloquée par le filtre pour guide d'ondes et que la structure à conducteurs (2) comporte, en plus de l'ouverture de diaphragme (3) centrale, deux ouvertures du diaphragme (3) agencées de manière identique et qui sont conçues pour la résonance propre pour une fréquence de transmission sélectionnée f(ind O) et sont disposées de manière symétrique par rapport à l'ouverture de diaphragme centrale (3).
  3. Filtre pour guide d'ondes selon la revendication 1 ou 2, caractérisé en ce que l'ouverture de diaphragme centrale (3) et les ouvertures de diaphragme supplémentaires (4) sont agencées sous la forme de conducteurs à fente, que les conducteurs à fente sont orientés perpendiculairement aux vecteurs (5) du champ E contigu du guide d'ondes et que les longueurs actives électriquement des conducteurs à fente sont égales, en fonction de la fréquence de résonance propre associée, à une demi-longueur d'onde de la fréquence de transmission f(ind O) ou de la fréquence parasite f(ind S1).
  4. Filtre pour guide d'ondes selon la revendication 3, caractérisé en ce que les largeurs des conducteurs à fente sont accordées sur l'action désirée de transmission et de blocage.
  5. Filtre pour guide d'ondes selon l'une des revendications 1 à 4, caractérisé en ce qu'une seconde structure à conducteurs (2) est insérée dans un plan de coupe transversale du guide d'ondes à une distance de la première structure à conducteurs (2), qui correspond approximativement à un quart de la longueur d'onde de la fréquence de transmission f(ind O) et que la seconde structure à conducteurs (2) possède une ouverture de diaphragme centrale (3) avec une résonance propre pour la fréquence de transmission f(ind O) et deux ouvertures de diaphragme supplémentaires (4) présentant respectivement une résonance propre, pour une seconde fréquence parasite f(ind S2) devant être bloquée, qui diffère de la première fréquence parasite f(ind S1).
  6. Filtre pour guide d'ondes selon l'une des revendications 1 à 5, caractérisé en ce que la structure à conducteurs (2) est formée d'une feuille métallique, dans laquelle sont aménagées les ouvertures de diaphragme (3,4).
  7. Filtre pour guide d'ondes selon l'une des revendications 1 à 5, caractérisé en ce que la structure à conducteurs (2) est constituée par un substrat électrique métallisé sur une face et que les ouvertures de diaphragme (3,4) sont formées dans la couche métallique du substrat.
  8. Filtre pour guide d'ondes selon l'une des revendications 1 à 7, caractérisé en ce que la section transversale du guide d'ondes (1) possède une forme rectangulaire.
  9. Filtre pour guide d'ondes selon l'une des revendications 1 à 7, caractérisé en ce que la section transversale du guide d'ondes (1) possède une forme circulaire.
EP96922868A 1995-06-30 1996-06-20 Filtre pour guide d'ondes Expired - Lifetime EP0835533B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19523869A DE19523869A1 (de) 1995-06-30 1995-06-30 Hohlleiterfilter
DE19523869 1995-06-30
PCT/EP1996/002686 WO1997002619A1 (fr) 1995-06-30 1996-06-20 Filtre pour guide d'ondes

Publications (2)

Publication Number Publication Date
EP0835533A1 EP0835533A1 (fr) 1998-04-15
EP0835533B1 true EP0835533B1 (fr) 2000-05-10

Family

ID=7765685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96922868A Expired - Lifetime EP0835533B1 (fr) 1995-06-30 1996-06-20 Filtre pour guide d'ondes

Country Status (9)

Country Link
US (1) US6340922B1 (fr)
EP (1) EP0835533B1 (fr)
JP (1) JP3242666B2 (fr)
KR (1) KR100296513B1 (fr)
CA (1) CA2225928A1 (fr)
DE (2) DE19523869A1 (fr)
ES (1) ES2147387T3 (fr)
IL (1) IL122830A0 (fr)
WO (1) WO1997002619A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6459346B1 (en) * 2000-08-29 2002-10-01 Com Dev Limited Side-coupled microwave filter with circumferentially-spaced irises
US6724280B2 (en) 2001-03-27 2004-04-20 Paratek Microwave, Inc. Tunable RF devices with metallized non-metallic bodies
US7009469B2 (en) * 2002-06-28 2006-03-07 Harris Corporation Compact waveguide filter and method
US7298264B1 (en) 2004-01-20 2007-11-20 Charles A. Eldering RFID tag filtering and monitoring
US7420458B1 (en) 2004-01-20 2008-09-02 Charles A. Eldering Secondary card reader

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104184A (en) * 1966-05-16 1968-02-21 Standard Telephones Cables Ltd Improvements in or relating to waveguide filters
CA1079369A (fr) * 1977-03-14 1980-06-10 Rca Limited Filtre double mode
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
NL181064C (nl) * 1979-11-15 1987-06-01 Nederlanden Staat Microgolffilter.
IT1163520B (it) * 1983-06-15 1987-04-08 Telettra Lab Telefon Filtri dual-mode
FR2604305B1 (fr) * 1986-09-18 1988-12-02 Alcatel Thomson Faisceaux Filtre composite a large bande de type plan e

Also Published As

Publication number Publication date
DE59605191D1 (de) 2000-06-15
US6340922B1 (en) 2002-01-22
CA2225928A1 (fr) 1997-01-23
KR19990028573A (ko) 1999-04-15
JP3242666B2 (ja) 2001-12-25
KR100296513B1 (ko) 2001-08-07
JPH10513025A (ja) 1998-12-08
IL122830A0 (en) 1999-11-30
DE19523869A1 (de) 1997-01-02
EP0835533A1 (fr) 1998-04-15
ES2147387T3 (es) 2000-09-01
WO1997002619A1 (fr) 1997-01-23

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