EP0246427B1 - Convertisseur de modes à guide d'ondes - Google Patents

Convertisseur de modes à guide d'ondes Download PDF

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Publication number
EP0246427B1
EP0246427B1 EP19870104804 EP87104804A EP0246427B1 EP 0246427 B1 EP0246427 B1 EP 0246427B1 EP 19870104804 EP19870104804 EP 19870104804 EP 87104804 A EP87104804 A EP 87104804A EP 0246427 B1 EP0246427 B1 EP 0246427B1
Authority
EP
European Patent Office
Prior art keywords
wave
groove
mode
coupling
decoupling
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
EP19870104804
Other languages
German (de)
English (en)
Other versions
EP0246427A1 (fr
Inventor
Klaus Eilhardt
Ludwig Haas
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
Messerschmitt Bolkow Blohm 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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of EP0246427A1 publication Critical patent/EP0246427A1/fr
Application granted granted Critical
Publication of EP0246427B1 publication Critical patent/EP0246427B1/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
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion

Definitions

  • the invention relates to a wave type switch, suitable for decoupling a higher wave type TM01 ° or TM11 ⁇ section from a waveguide with low coupling of the basic wave type TE11 °, with known coupling elements, such as coaxial probes or slots, which are radially symmetrical in at least one in the circumferential direction in the groove in the waveguide wall, which runs transversely to the radiation direction, are arranged,
  • Such wave type switches are known in principle from horn radiators with integrated mode couplers for at least one higher wave type for the purpose of automatically tracking the antenna to a moving radiation source that emits electromagnetic waves.
  • DE-AS 24 60 552 describes a horn with an arrangement for removing wave types used for deposit measurement, which has coaxial coupling probes located in the horn wall, coupling loops of the coupling slots, which are arranged radially symmetrically in a groove running around the horn wall.
  • the groove depth here is a quarter of a wavelength and it is assumed that a hybrid basic wave type preferably propagates in the horn.
  • the coupling elements are carried out into the interior of the horn.
  • the invention has for its object to provide an arrangement for decoupling the TM01 ° - or TM11 ⁇ - wave type from a smooth-walled waveguide section with a circular or square cross section for a circularly polarized wave, which has a very low coupling of the basic wave type and the use high transmission power allowed.
  • the decoupling point of the higher wave type TM01 ° or TM11 ⁇ at a distance of about a quarter of the waveguide wavelength ⁇ of the relevant higher wave type TM01 ° or TM11 ⁇ from the first stage of a known stepped ⁇ TE11 / 4-transformer, which reduces the cross section of the waveguide section containing the wave-type switch, is arranged and that the coupling takes place via a radially circumferential groove with a groove depth T in the range of 0.4 ⁇ T / ⁇ ⁇ 0.7 and a groove width B in the range of 0.01 ⁇ B / ⁇ ⁇ 0.05, wherein the coupling elements are arranged in pairs opposite one another on the circumference of the outer wall of the groove.
  • the ⁇ TE11 / 4 transformer can also have one or more grooves in the wall of the waveguide section to improve the standing wave ratio of the basic wave type TE11 °.
  • the waveguide wall can run in the area of the coupling point with a tapering cross section.
  • FIGURE shows a schematically simplified section through an exemplary embodiment of a wave type switch according to the invention.
  • the exemplary embodiment is designed as a waveguide component HL with a round cross section, which can be integrated into a cable run by means of the flanges F1, F2.
  • the waveguide section reduces the cross section from a diameter D2 at the flange F2, in which, in addition to the fundamental shaft TE11 °, the first higher shaft type TM01 ° is also capable of spreading, to a diameter D1 at the flange F1, in which only the basic shaft type can still exist.
  • the transition stage in the area of the coupling point K with the circumferential groove N is designed so that the basic wave type TE11 ° is transmitted as reflection-free as possible and at the same time the TM01 - ° wave type to be decoupled is reflected in phase and forms a standing wave. Therefore, a ⁇ TE11 / 4- transformer TR with a step S at a distance ⁇ / 4 from the coupling point K was provided for reflection of the higher wave type TM01.
  • the coupling out of the higher shaft type TM01 ° takes place via a radially circumferential groove N, which is very small in relation to its depth T.
  • Width B In contrast to the usual dimensioning, the depth T was chosen in the range of 0.4 ⁇ T / ⁇ ⁇ 0.7, where ⁇ is the waveguide wavelength of the higher wave type TM01 to be coupled out.
  • the width B of the groove N is set in the range 0.01 ⁇ B / ⁇ ⁇ 0.05.
  • the type of decoupling of a higher shaft type according to the invention can also be applied without restriction to a waveguide section with a square cross section.
  • the square waveguide section then again has a stepped ⁇ / 4 transformer TR at the coupling point, which forms the reflection plane for the higher wave type TM11 ⁇ to be coupled out from a radially circumferential groove N.
  • the ⁇ / 4 transformer can also be designed with a linearly conical or pyramidal or continuously curved wall profile in the area of the coupling point. It is also conceivable to provide one or more grooves in the area of the coupling point to improve the adaptation of the basic wave type.

Landscapes

  • Waveguide Aerials (AREA)
  • Waveguides (AREA)

Claims (3)

  1. Filtre adapté pour la séparation d'un mode d'excitation supérieur TM₀₁° ou TM₁₁□ dans un tronçon de guide d'onde (HL) à faible couplage du mode d'excitation fondamental TE₁₁° comportant des éléments de couplage (E) connus, tels que par exemple des sondes coaxiales ou des fentes, qui sont disposés de manière symétrique radialement dans au moins une rainure (N) perpendiculaire à la direction de rayonnement dans la direction circonférentielle dans la paroi du guide d'onde, caractérisé en ce que le point de séparation (K) du mode d'excitation supérieur TM₀₁° ou TM₁₁□ est situé à une distance d'environ 1/4 de la longueur d'onde du guide d'onde λ du mode d'excitation supérieur TM₀₁° ou TM₁₁□ concerné du premier gradin (S) d'un convertisseur λ TE11/4 (TR) étagé, qui réduit la section du tronçon de guide d'onde (HL) comportant le filtre, et en ce que la séparation est réalisée par l'intermédiaire d'une rainure radiale circulaire (N) dont la profondeur de rainure T est située dans le domaine 0,4 < T/λ <0,7 et dont la largeur B est située dans le domaine 0,01 < B/λ <0,05, les éléments de couplage (E) étant disposés face à face par paires sur le pourtour de la paroi extérieure (A) de la rainure (N).
  2. Filtre selon la revendication 1, caractérisé en ce que le convertisseur λ TE₁₁/4 (TR) comporte une ou plusieurs rainures dans la paroi du tronçon de guide d'onde (HL) afin de permettre une meilleure adaptation du mode d'excitation fondamental TE₁₁°.
  3. Filtre selon la revendication 1, caractérisé en ce que la section du tronçon de guide d'onde (HL) diminue dans la zone du point de séparation (K).
EP19870104804 1986-05-23 1987-04-01 Convertisseur de modes à guide d'ondes Expired - Lifetime EP0246427B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863617438 DE3617438C1 (de) 1986-05-23 1986-05-23 Wellentypweiche
DE3617438 1986-05-23

Publications (2)

Publication Number Publication Date
EP0246427A1 EP0246427A1 (fr) 1987-11-25
EP0246427B1 true EP0246427B1 (fr) 1991-09-11

Family

ID=6301515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870104804 Expired - Lifetime EP0246427B1 (fr) 1986-05-23 1987-04-01 Convertisseur de modes à guide d'ondes

Country Status (2)

Country Link
EP (1) EP0246427B1 (fr)
DE (1) DE3617438C1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725268A1 (de) * 1987-07-30 1989-02-09 Messerschmitt Boelkow Blohm Wellentypweiche

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388399A (en) * 1965-03-25 1968-06-11 Navy Usa Antenna feed for two coordinate tracking radars
IT946090B (it) * 1971-11-24 1973-05-21 Siemens Spa Italiana Circuito di estrazione del segnale errore nel puntamento di una anten na a microonde verso un bersaglio mobile
FR2255716B1 (fr) * 1973-12-20 1978-03-24 Thomson Csf
US4148035A (en) * 1977-12-14 1979-04-03 Rca Corp. Subwavelength monopulse antenna

Also Published As

Publication number Publication date
EP0246427A1 (fr) 1987-11-25
DE3617438C1 (de) 1987-10-15

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