EP0197350B1 - Cornet rainuré double bande à transition diélectrique - Google Patents

Cornet rainuré double bande à transition diélectrique Download PDF

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Publication number
EP0197350B1
EP0197350B1 EP86103404A EP86103404A EP0197350B1 EP 0197350 B1 EP0197350 B1 EP 0197350B1 EP 86103404 A EP86103404 A EP 86103404A EP 86103404 A EP86103404 A EP 86103404A EP 0197350 B1 EP0197350 B1 EP 0197350B1
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European Patent Office
Prior art keywords
horn
length
dielectric
transition section
dielectric constant
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
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EP86103404A
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German (de)
English (en)
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EP0197350A1 (fr
Inventor
Eberhard Dipl.-Ing. Tauscheck
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H01Q13/0208—Corrugated horns

Definitions

  • the invention relates to a double-band horn radiator, consisting of a transition part adjoining a feed waveguide of circular cross-section and a horn, the funnel-shaped inner wall of which is provided with grooves, for two frequency bands lying apart.
  • Grooved horns of this type are frequently used in the microwave range because of their favorable properties. With suitable dimensioning in a broad frequency band, they have good adaptation as well as directional characteristics with high axial symmetry and low cross polarization. To achieve these properties, the groove dimensions must be dimensioned precisely.
  • short grooved horn radiators are mainly used as exciters for the mirror system, since horns with large opening angles. d. H. > 30 °, enable good diagram properties over a wide frequency range with a short overall length.
  • series antennas it is important that no mechanically complicated structures of the grooves and the transition zone from the feed waveguide to the groove part of the horn are required, since otherwise the horn has to be assembled in a complex manner from several fitting parts.
  • the optimization of the reflection factor in two frequency bands separated by a factor of 1.7 to values below 3% is not guaranteed in the design of the horns according to known dimensioning rules by simply varying the grooves and the transition form in the metal body of the horn.
  • the pressure seal on the horn usually a dielectric plate, must also be included in the reflection adjustment, the compensation of which is difficult at high bandwidths.
  • the invention has for its object to design a horn of the type described above so that an optimization of the reflection in two different frequency bands is achieved in a simple manner.
  • the horn emitter shown in Fig. 1 consists of a transition part 1 of length So and a horn 2 (groove part).
  • B o is the feed waveguide diameter
  • x the length of the horn
  • K is a coefficient with the value «1
  • n is a coefficient with a value 2 ⁇ n ⁇ 8, for example 5.
  • the transition part 1 has a flat start, in which the gradation only begins after about 2/3 of its length.
  • the following horn 2 is constructed in accordance with the known formulas and computer programs for radiation optimization. With appropriate dimensions, such a horn typically has reflection factors of r ⁇ 10% in the lower band and r ⁇ 5% in the upper band.
  • the disturbance of the fundamental wave H 11 in the lower band generated at the horn bend and at the first grooves is in an axially extended area in the B o - e K ⁇ xn transition with a very weak rigid foam dielectric 3 ( Er1 ⁇ 1.3) at the next possible location in the Transition compensated.
  • the dielectric 3 completely or partially fills the last quarter of the transition part 1 in the direction of the horn 2. Because of the large distance between the frequency bands and thus the waveguide wavelength ratio ⁇ H E 1 below / ⁇ H E1 above, it is possible to interpret the interference caused in the upper band by the axial distance between the interfaces of the weak dielectric itself.
  • the average electrically effective length of the dielectric 3 in the stepped transition part corresponds to the condition ⁇ H ⁇ 1 / 2 for the upper operating frequency range.
  • the mechanical length S of the continuous weak dielectric 3 that is to say the dielectric with a low dielectric constant, is approximately So / 8 to So / 3 if So is the length of the transition 1 .
  • a partial length of the dielectric 3 with a low dielectric constant ⁇ r1 is replaced by a thin disk 4 (film) with a higher dielectric constant Er2 (er 2 - 2.5 to 4.7).
  • the dielectric 3 with a low dielectric constant ⁇ r1 is removed in the end region, ie shortened by the length S - S'o, where S'o is the remaining length of the dielectric 3.
  • the thin disk 4 of the material of high dielectric constant Er2 is applied to the reduced end area of the dielectric 3, which is much thinner than the removed material layer.
  • the dielectric body 3, 4 is glued into the step transition.
  • the change in the radiation diagram compared to the unbalanced horn is small and can usually be neglected. This is a great advantage when dimensioning the grooved horn, because e.g. B. Changes in the first grooves to improve the fit, especially in the upper band, can have a major impact on the radiation pattern. If an axial groove structure is selected when dimensioning the horn, the type of compensation enables grooved horns without undercuts * ) and complicated curves to be built, so that production in one piece is possible as a turned part.
  • the horn emitter according to the invention with the specially designed transition part thus advantageously serves to fine-tune the reflection factor in two spaced-apart frequency bands in grooved horns, which are designed on the basis of radiation diagram optimization. At the same time, the problem of reflection of the pressure seal in two bands is also solved. * ) grooved grooves

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  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)

Claims (5)

1. Antenne à cornet double bande, constitué par une partie de jonction se raccordant à un guide d'ondes d'alimentation possédant une section transversale circulaire, et par un cornet, dont la paroi intérieure, qui s'élargit en forme d'entonnoir, comporte des nervures, pour deux bandes séparées de fréquences, caractérisée par le fait que la zone de jonction (1) s'élargit conformément à une courbe Bo - eKxn, Bo étant le diamètre du guide d'ondes d'alimentation, x l'étendue longitudinale du cornet, K un coefficient ayant une valeur 1 et n un coefficient ayant une valeur telle que 2 < n < 8, de sorte que l'angle d'ouverture correspond, au niveau de la première nervure du cornet, à 0,5 ± 0,2 fois l'angle permanent d'ouverture du cornet, et que la zone d'extrémité de la partie de jonction
(1), qui est tournée vers le cornet et possède la longueur So, est complètement ou partiellement remplie, sur une longueur comprise entre So/8 et So/3 (So = longueur de la zone de jonction) par un diélectrique (3) possédant une constante diélectrique (Eri) faible, inférieure à 1,3, de sorte que la longueur moyenne, efficace du point de vue électrique, du diélectrique (3) dans la partie de jonction étagée satisfait à la condition λHε1 su- périeure/2 pour la plage supérieure des fréquences de fonctionnement, λHε1 supérieure représentant la longueur d'onde de la fréquence supérieure de fonctionnement.
2. Dispositif suivant la revendication 1, caractérisé par le fait que sur une partie de sa longueur, le diélectrique (3) possédant une constante diélectrique faible est remplacé par au moins un disque mince (4) réalisé en un matériau possédant une constante diélectrique supérieure (Er2) comprise entre approximativement 2,5 et 4,7, destinée à assurer la fonction d'une étanchéité à la pression, optimisée du point de vue de la réflexion.
3. Dispositif suivant la revendication 2, caractérisé par le fait qu'un disque mince (4) possédant une constante diélectrique supérieure est disposé d'un côté ou des deux côtés du diélectrique (3) possédant une constante diélectrique faible.
4. Dispositif suivant l'une des revendications 1 à 3, caractérisé par le fait que le contour intérieur de la zone de jonction est subdivisé, conformément à la fonction Bo - eKxn, en échelons présentant de petites variations brusques constantes du diamètre.
EP86103404A 1985-03-14 1986-03-13 Cornet rainuré double bande à transition diélectrique Expired - Lifetime EP0197350B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853509259 DE3509259A1 (de) 1985-03-14 1985-03-14 Doppelbandrillenhorn mit dielektrischem abgleich
DE3509259 1985-03-14

Publications (2)

Publication Number Publication Date
EP0197350A1 EP0197350A1 (fr) 1986-10-15
EP0197350B1 true EP0197350B1 (fr) 1990-02-28

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EP86103404A Expired - Lifetime EP0197350B1 (fr) 1985-03-14 1986-03-13 Cornet rainuré double bande à transition diélectrique

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EP (1) EP0197350B1 (fr)
AU (1) AU582630B2 (fr)
DE (2) DE3509259A1 (fr)

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EP0197350A1 (fr) 1986-10-15
AU582630B2 (en) 1989-04-06
DE3509259A1 (de) 1986-09-18
DE3669237D1 (de) 1990-04-05
AU5467986A (en) 1986-09-18

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