EP1695412A1 - Dispositif d'injection de signal - Google Patents

Dispositif d'injection de signal

Info

Publication number
EP1695412A1
EP1695412A1 EP04804819A EP04804819A EP1695412A1 EP 1695412 A1 EP1695412 A1 EP 1695412A1 EP 04804819 A EP04804819 A EP 04804819A EP 04804819 A EP04804819 A EP 04804819A EP 1695412 A1 EP1695412 A1 EP 1695412A1
Authority
EP
European Patent Office
Prior art keywords
waveguide
coaxial cable
arrangement
inner conductor
rear wall
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.)
Withdrawn
Application number
EP04804819A
Other languages
German (de)
English (en)
Inventor
Qi Chen
Klaus Feisst
Eric Bergmann
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP1695412A1 publication Critical patent/EP1695412A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/103—Hollow-waveguide/coaxial-line transitions

Definitions

  • the invention relates to a coupling, in particular a transition from a coaxial line into a waveguide filled with air or with a dielectric.
  • Couplings of this type are known and are used, for example, in devices in which a high-frequency electromagnetic signal generated in a corresponding electronic circuit is passed from the electronic circuit to a waveguide or waveguide via a coaxial cable.
  • a plug connection is often provided in or on the waveguide.
  • An inner conductor of the coaxial cable is continued in the interior of the waveguide as an excitation pin.
  • the TEM mode existing in the coaxial cable is converted into the basic mode TE 11 of the waveguide.
  • Couplings or arrangements of this type for coupling electromagnetic signals from a coaxial line into a waveguide are used in devices for the propagation and reception of electromagnetic signals, such as in radio technology systems, in distance measuring devices that work according to the transit time method, and in particular in level measuring devices according to the transit time principle for industrial measurement technology.
  • the waveguide is coupled from the side, the inner conductor of the coaxial line serving as a pin-shaped or mushroom-shaped excitation pin to excite the TE mode in the waveguide.
  • the lateral coupling requires an external plug connection and therefore a large amount of space. It is also unfavorable in terms of assembly.
  • the lateral coupling is also unsuitable for direct coupling without an HF cable.
  • the invention is therefore based on the object of specifying an arrangement for coupling which avoids the disadvantages described above, which is particularly space-saving, simple and robust to manufacture and which allows simple RF adaptation and which is suitable for broadband applications.
  • This object is achieved according to the invention by an arrangement for coupling electromagnetic signals from a coaxial line into a waveguide, an inner conductor of the coaxial cable opening into a rear wall of the waveguide, the inner conductor being continued as excitation in the waveguide, and one of the Back wall of the waveguide tip of the excitation pin is electrically conductively connected to a side wall of the waveguide.
  • the waveguide has a cylindrical bore.
  • a waveguide with a conical bore is provided.
  • the inner conductor of the coaxial cable opens eccentrically into the rear wall of the waveguide.
  • the bore of the waveguide is filled with a dielectric material, preferably a perfluoroplastic.
  • Fig. 2 shows an embodiment of an arrangement for
  • FIG. 3 shows the arrangement according to FIG. 2 in a perspective view Representation of a cut waveguide in
  • FIG. 4 shows the arrangement according to FIG. 3 in a perspective
  • FIG. 1 is used to provide a general explanation of the arrangement 10 and the processes involved in coupling high-frequency electromagnetic signals from a coaxial cable 12 into a waveguide 14, for example a circular waveguide.
  • An inner conductor 16 of the coaxial cable 12 opens into a rear wall 18 of the waveguide 14.
  • the inner conductor 16 is continued as Errege ⁇ in 20 in the waveguide 14, and a tip 22 of the Errege ⁇ ins 20 facing away from the rear wall 18 of the waveguide is electrically conductive with a side wall 24 of the waveguide 14 connected. As is known, it is about converting the TEM wave existing in the coaxial cable 12 into a TE wave.
  • the waveguide 14 must be dimensioned in such a way that no higher modes can be propagated apart from TEM and TE, since they represent the lowest existing solutions of the MAXWELL equation.
  • the disturbed rotational symmetry of the field distribution of the TEM waves leads to an asymmetrical field distribution of TE waves. Reflections at defects have to be destructively interfered with.
  • the geometry of the arrangement 10 must be optimized so that the two reflected TEM waves (see diagram in the upper part of FIG. 1) interfere destructively, i.e. with a phase shift of ⁇ , and the transmitted TE waves interfere constructively, i.e. with a phase shift of 2 ⁇ .
  • the invention solves this problem by making the transition of the Errege ⁇ ins 20 to the side wall 24 softer than shown in Fig. 1. 2 shows an arrangement 10 designed in this way according to the invention, the illustration of the coaxial cable (see FIG. 1) being dispensed with.
  • the inner conductor 16 of the coaxial cable is expediently guided in a glass bushing 28 in the rear wall 18 of the waveguide.
  • the waveguide 14, for example a round waveguide is preferably filled with a dielectric material, preferably with a material made of perfluoroplastic, for example a polytetrafluoroethylene or perfluoroakoxy copolymer.
  • the Errege ⁇ in 20 is designed as a straight pin and extends in the interior of the waveguide at an angle inclined to the side wall 24.
  • the waveguide 14 fills it Cylinder 26 made of dielectric material milled a corresponding groove, so that the cylinder 26 can be inserted into the waveguide 14 with pre-assembled Errege ⁇ in 20. It makes sense to pay a lot of attention to contacting the Errege ⁇ ins 20, since it must be carried out very carefully. Both at the contacting of the Errege ⁇ ins 20 on the conductor 16 of the glass bushing 28 and on the side wall 24 of the waveguide 14, a strong line current flows on the surface.
  • FIG. 3 and 4 show the arrangement 10 according to the invention according to FIG. 2 in perspective representations.
  • the waveguide 14, its rear wall 18, the Errege ⁇ in 20 and the glass bushing 28 can be clearly seen.
  • a sectional illustration was chosen for FIG. 3, the cylinder 26 (see FIG. 2) made of dielectric material not being shown here.
  • Fig. 4 shows the arrangement 10 in a view from the front, quasi into the waveguide 14.
  • FIGS. 2, 3 and 4 clearly show that the glass bushing 28 for the inner conductor 16 of the coaxial cable is arranged eccentrically in the rear wall 18 of the waveguide 14. Accordingly, the Errege ⁇ in 20 in the interior of the waveguide 14 is applied eccentrically to the rear wall 18.
  • waveguides with a conical bore can also be used.

Landscapes

  • Waveguide Aerials (AREA)
  • Waveguides (AREA)
  • Communication Cables (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

L'objectif de l'invention est d'optimiser les dispositifs d'injection de signal de l'art antérieur. L'invention concerne donc un dispositif (10) pour l'injection de signaux électromagnétiques, à partir d'un câble coaxial, dans un guide d'ondes (14), dispositif dans lequel une broche d'excitation (20) s'étend, dans le guide d'ondes (14), à partir de la paroi arrière (18) de celui-ci et est reliée de façon électroconductrice avec une paroi latérale (24) dudit guide d'ondes (14).
EP04804819A 2003-12-18 2004-12-14 Dispositif d'injection de signal Withdrawn EP1695412A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359867A DE10359867A1 (de) 2003-12-18 2003-12-18 Einkopplung
PCT/EP2004/053461 WO2005060042A1 (fr) 2003-12-18 2004-12-14 Dispositif d'injection de signal

Publications (1)

Publication Number Publication Date
EP1695412A1 true EP1695412A1 (fr) 2006-08-30

Family

ID=34672941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04804819A Withdrawn EP1695412A1 (fr) 2003-12-18 2004-12-14 Dispositif d'injection de signal

Country Status (5)

Country Link
US (1) US20080003872A1 (fr)
EP (1) EP1695412A1 (fr)
CN (1) CN1902780A (fr)
DE (1) DE10359867A1 (fr)
WO (1) WO2005060042A1 (fr)

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DE102006062223A1 (de) * 2006-12-22 2008-06-26 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät zur Ermittlung und Überwachung eines Füllstandes eines im Prozessraum eines Behälters befindlichen Mediums
DE102007009094B4 (de) * 2007-02-24 2009-11-26 Festo Ag & Co. Kg Aktor mit Positionsmessvorrichtung
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CN1902780A (zh) 2007-01-24
US20080003872A1 (en) 2008-01-03

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