EP0835533A1 - Filtre pour guide d'ondes - Google Patents

Filtre pour guide d'ondes

Info

Publication number
EP0835533A1
EP0835533A1 EP96922868A EP96922868A EP0835533A1 EP 0835533 A1 EP0835533 A1 EP 0835533A1 EP 96922868 A EP96922868 A EP 96922868A EP 96922868 A EP96922868 A EP 96922868A EP 0835533 A1 EP0835533 A1 EP 0835533A1
Authority
EP
European Patent Office
Prior art keywords
waveguide
ind
conductor structure
designed
waveguide 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.)
Granted
Application number
EP96922868A
Other languages
German (de)
English (en)
Other versions
EP0835533B1 (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
Daimler Benz 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 Daimler Benz Aerospace AG filed Critical Daimler Benz 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

Links

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 hollow conductor filter according to the preamble of patent claim 1.
  • waveguide circuits compliance with the legal provisions with regard to the frequency band specifications and in particular with regard to the suppression of the interference radiation generated by oscillators, for example a harmonic of the useful signal, represents a not inconsiderable part of the development costs of a device concept. So far, the use of cavity resonators has been used in waveguide circuits , which are coupled with waveguide diaphragms, and the use of resonance structures in the area of the fin is known in FIN line circuits. Waveguide apertures are designed according to the known theories of waveguide aperture technology (Waveguide Handbook, N. Marcuwitz, Mc Graw-Hill Book Company INC., Edition 1986).
  • the waveguide diaphragms are designed as planar structures with, for example, circular, slot-shaped or H-shaped diaphragm openings and are inserted in a cross-sectional plane of an elongated waveguide perpendicular to the waveguide axis between a feeding and a further section of the waveguide.
  • the apertures When used as a bandpass filter, the apertures are operated at their own resonance, which is known to be set for slot-shaped apertures with an electrically effective slot length of half a wavelength of the useful frequency.
  • the transmittance T of slot-shaped diaphragm openings is determined with the slot width.
  • the waveguide diaphragms designed as bandpass filters only have an attenuation curve corresponding to the resonance curve outside their passband.
  • bandpass filters it is generally not possible to specifically block interfering frequency multiples of the useful frequency.
  • the known bandpass filters have to be supported with additional filter measures.
  • the required volume of the known bandpass filter interferes.
  • the manufacturing costs for FIN conductors with resonance structures are relatively high.
  • the object of the invention is to provide a bandpass filter for waveguides, which additionally serves as a blocking filter for the targeted suppression of interference frequencies. This object is achieved by the features of claims 1 and 2. Developments of the invention are specified in the subclaims.
  • the invention has the advantage that the transmission of a useful frequency and a targeted suppression of interference frequencies is possible with a single component with little effort.
  • manufacturing tolerances can be maintained with little effort and it only requires a small installation depth. Due to its symmetrical structure, the disturbance mode excitation is minimal.
  • FIG. 1 shows the principle of the conductor structure of a waveguide filter according to the invention for rectangular waveguides
  • FIG. 2a to 2c show transmission curves of individual diaphragm openings and of the entire waveguide filter
  • FIG. 3 shows a two-circuit waveguide filter with two conductor structures and arranged one behind the other
  • FIG. 4a to FIG. 4d show transmission curves of individual diaphragm openings and of the entire two-circuit hollow conductor filter.
  • FIG. 1 shows the conductor structure 2 of a waveguide filter, which is placed on the cross-sectional area of a rectangular waveguide 1.
  • the conductor structure 2 is formed in a metal layer on a planar, one-sided metallized dielectric substrate.
  • a centrally arranged diaphragm opening 3 and two further diaphragm openings 4 are integrated into the conductor structure 2 and are symmetrically assigned to the centrally arranged diaphragm opening 3.
  • the diaphragm openings 3, 4 are designed as slot conductors short-circuited on both sides and arranged parallel to one another and perpendicular to the vectors 5 of the adjacent waveguide E field.
  • the electrically effective length of the centrally arranged slot conductor is half a wavelength of the transmission frequency f (ind 0) and the electrically effective length of the assigned slot conductor is half a wavelength of an interference frequency f (ind S1) of the waveguide filter to be blocked.
  • the slot conductors dimensioned in this way are self-resonant for the assigned frequencies and radiate with maximum power in the adjoining further section of the waveguide 1.
  • the transmission phases of the centrally arranged slot conductor and those of the assigned slot conductors have in the frequency range f (ind 0) - f (ind Sl) opposite signs and different phase steepness, so that the amount of the sum vector of the overlapping slot conductor fields is minimized in the further section of the waveguide 1.
  • the effect according to the invention can optionally also be achieved if only one slot conductor is assigned to the centrally arranged slot conductor in the manner described above.
  • the assignment of two slot conductors has the advantage that the interference mode excitation is minimal due to the symmetrical structure of the waveguide filter.
  • An arrangement of the two assigned slot conductors in the vicinity of the border 6 of the hollow conductor interior also contributes to this.
  • the assignment of the transmission frequency and the interference frequency to be blocked to the diaphragm openings 3 and 4 can also be inverted, so that the centrally arranged diaphragm opening 3 to the interference frequency f (ind S1) and the assigned diaphragm openings 4 to the transmission frequency f (ind 0 ) are designed.
  • FIG. 2a to FIG. 2c show the transmission curves of the waveguide filter according to FIG. 1.
  • FIG. 2a shows the transmission curve of the centrally arranged slot conductor
  • FIG. 2b shows the transmission curve of the cooperating assigned slot conductors
  • FIG. 2c the transmission curve of all superimposed slot conductor fields of the waveguide filter.
  • a dual-circuit waveguide filter is to be constructed with regard to the blocking effect, this can be done according to the method shown in FIG. 3 realize embodiment shown in that two spaced conductor structures 2, which basically correspond to the embodiment of FIG. 1 are designed to be used in the waveguide.
  • the distance between the conductor structures 2 is a quarter of the wavelength of the transmission frequency f (ind 0).
  • the natural resonances of the assigned slot conductors of the one conductor structure 2 are designed for a first interference frequency f (ind S1) and those of the second conductor structure for a second interference frequency f (ind S2).
  • the natural resonances of the centrally arranged slot conductors are designed for the transmission frequency f (ind 0) in both conductor structures.
  • FIG. 4a shows the transmission curve of one of the centrally arranged slot conductors.
  • FIGS. 4b and 4c show the transmission curves of the two cooperating assigned slot conductors of a conductor structure for the respective interfering 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 range around the frequency f (ind 0).
  • the waveguide filter according to the invention can also be designed for waveguides with other cross-sectional shapes, it being necessary to ensure that the slotted conductors are aligned perpendicular to the vectors 5 of the adjacent waveguide E field.
  • the conductor structure 2 can be a metal foil, the thickness of which must not be greater than one eighth of the wavelength of the highest interference frequency to be blocked. However, it can also be formed in a metal layer of a dielectric substrate metallized on one side, the filter properties deteriorating with increasing size of the dielectric constant of the substrate.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)

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.
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 true EP0835533A1 (fr) 1998-04-15
EP0835533B1 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
WO2002078118A1 (fr) 2001-03-27 2002-10-03 Paratek Microwave, Inc. Dispositifs rf accordables pourvus de corps non-metalliques metallises
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9702619A1 *

Also Published As

Publication number Publication date
DE59605191D1 (de) 2000-06-15
US6340922B1 (en) 2002-01-22
CA2225928A1 (fr) 1997-01-23
EP0835533B1 (fr) 2000-05-10
ES2147387T3 (es) 2000-09-01
JPH10513025A (ja) 1998-12-08
DE19523869A1 (de) 1997-01-02
JP3242666B2 (ja) 2001-12-25
KR100296513B1 (ko) 2001-08-07
KR19990028573A (ko) 1999-04-15
WO1997002619A1 (fr) 1997-01-23
IL122830A0 (en) 1999-11-30

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