EP0018261B1 - Breitbandwellenleiter mit zwei Polarisationsrichtungen - Google Patents

Breitbandwellenleiter mit zwei Polarisationsrichtungen Download PDF

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Publication number
EP0018261B1
EP0018261B1 EP80400448A EP80400448A EP0018261B1 EP 0018261 B1 EP0018261 B1 EP 0018261B1 EP 80400448 A EP80400448 A EP 80400448A EP 80400448 A EP80400448 A EP 80400448A EP 0018261 B1 EP0018261 B1 EP 0018261B1
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EP
European Patent Office
Prior art keywords
wave guide
section
waveguide
symmetry
mode
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
Application number
EP80400448A
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English (en)
French (fr)
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EP0018261A1 (de
Inventor
Jacky Tourneur
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0018261A1 publication Critical patent/EP0018261A1/de
Application granted granted Critical
Publication of EP0018261B1 publication Critical patent/EP0018261B1/de
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    • 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
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/06—Coaxial lines

Definitions

  • the present invention relates to broadband microwave waveguides, allowing propagation under identical conditions of cutoff frequency and impedance of two electromagnetic waves of polarization, or direction of the electric field, orthogonal.
  • Bandwidth is defined by the ratio: where ⁇ c 2 and ⁇ c 1 are the cutoff wavelengths of the fundamental mode and the first higher order mode.
  • the constraint of the double polarization imposes on the cross section of the guide to admit the longitudinal axis of the wave guide as an axis of symmetry of order 4n where n is any integer ⁇ 1, a symmetry of order 4n with respect to to this longitudinal axis being a symmetry such as a rotation around this same axis of the section of the waveguide by an angle of does not change the properties of the waveguide, the polarizations of this waveguide being generally unchanged.
  • a determined mode propagates only if there are the conditions necessary for its excitation, the TE 20 mode, asymmetrical mode, not appearing in a waveguide where radio propagation symmetry conditions are maintained, even beyond the TE 20 cutoff frequency.
  • a bending of the guide capable of creating an asymmetry, causes the appearance of the TE zo mode.
  • a guide can therefore only be used, outside of its bandwidth, under very specific conditions of mechanical and / or radio symmetry.
  • FR-A-2 116 441 is a broadband, double polarization waveguide in which the cross section is cruciform.
  • This waveguide consists of a hollow conductor, of rectangular or square section, on the internal face of which are arranged four corners situated on the bisectors of the main axes of propagation in order to obtain the transmission of the wave injected with particularly low depreciation.
  • the present invention aims to significantly increase the bandwidth of a waveguide in order to obtain bandwidths greater than 60%
  • the subject of the invention is a wideband, double polarization waveguide consisting of a hollow conductor of polygonal section having with respect to its center of symmetry, a symmetry of order 4n, in which n is an integer, and two main axes of propagation, mutually orthogonal, the internal face of this hollow conductor is provided four notches whose longitudinal planes of symmetry are located along the bisectors of the main axes of propagation and this waveguide comprises a central conductive core of polygonal shape, the section of this central core and that of the hollow conductor being homothetic with respect to the center of symmetry.
  • the wide-band double polarization waveguide object of the invention, comprises a hollow conductor of polygonal section 1 having, with respect to a center of symmetry C, a symmetry of order 4n where n is any integer.
  • the waveguide according to the invention contains inside the hollow conductor of polygonal section a plurality of conductive steps 2, the section of which determines, with the polygonal section, a propagation section of the waveguide.
  • Each of the steps 2 is arranged on the internal face of the sides of the hollow conductor, according to a symmetry of order 4 with respect to the center of symmetry C.
  • the longitudinal plane of symmetry of each of the steps is oriented, in the propagation section of the guide in the direction of the bisectors of the main axes of the waveguide.
  • the main axes of the waveguide are represented by the axes X'X, and Y'Y, their orientation corresponds respectively to the direction of the electric fields of the propagation modes TE lQ and TE oi , for the guide wave considered.
  • the longitudinal plane of symmetry of each step has not been shown so as not to overload the figure.
  • the waveguide according to the invention comprises, on the other hand, inside the hollow conductor of polygonal section, a central conductive core 3, the section of which has with respect to the center of symmetry C the same symmetry d order 4n, the sections of the central conductive core and of the hollow conductor of polygonal section being homothetic with respect to this center of symmetry C.
  • the hollow conductor of polygonal section has a square side section 2a.
  • This section presents, with respect to the center of symmetry C, a symmetry of order 4.
  • the hollow conductor comprises, inside each dihedral angle formed by two consecutive sides of the square section, a conductive step 2 of also square section on the W side.
  • the four steps arranged in the section of the hollow conductor, at the end of the diagonals of this section, determine, with the square section of the hollow conductor, a propagation section of the waveguide having, with respect to this same center of symmetry C, a symmetry of order 4.
  • the hollow conductor of polygonal section comprises, on the other hand, a central conductive core 3 whose square section of side 2k has, with respect to this same center of symmetry C, the same order 4 symmetry.
  • the diagonals of the square section of the hollow conductor 1 and the diagonals of the section of the central conductive core are combined.
  • FIGS. 2a and 2b The operation of the waveguide, object of the invention, is as follows taking into account FIGS. 2a and 2b in which FIG. 2a comprises a system of axes whose ordinates are graduated in standard cut-off frequency or ratio of dimension of the guide, according to FIG. 1, at the cut-off wavelength of this same guide, the normalized cut-off frequency being noted and whose abscissae are graduated in relation to the dimension on the side of the step W to the same dimension 2a of the waveguide.
  • FIG. 2a represents the variations in the cutoff frequencies of the main propagation modes such as the TE 11 , TM 11, TE 201 and TE 10 modes. In the same way, FIG.
  • FIG. 2b represents, on a system of axes, respectively on the ordinate, the normalized cut-off frequencies of the waveguide, the ordinate axis being graduated in value of the ratio where 2a represents the dimension of the side of the square section of the waveguide, according to FIG. 1, and ⁇ c the corresponding cut-off wavelength, as a function of the ratio of the dimension of the central conducting core of square section of side 2k related to this same dimension of the square section waveguide and side 2a.
  • FIG. 2b represents the different standardized cut-off frequencies for the main modes such as TM 11 , TE 201 , TE 11 , and TE 10 .
  • FIG. 2a and 2b respectively show that, in the case of the square guide comprising the only steps within each dihedral angle formed by two consecutive sides of the square section, the TM 11 mode limits the bandwidth as long as the ratio remains less than 0.22, the TE 201 mode becoming substantially the first parasitic mode for higher values of this ratio.
  • FIG. 2b shows that, in the case of the square section guide comprising a central core of also square section, the only higher order mode limiting the bandwidth is the TE 11 mode whose cut-off frequency depends little on the report According to the ivention, the simultaneous use of the propagation characteristics of the guide alone comprising the steps, as shown in FIG.
  • the bandwidth of the guide thus produced is a function of the ratios W and K , geometrical parameters of the guide according to the invention. For a determined K value, there is an optimal W ratio for which the bandwidth is maximum.
  • the value of the bandwidth BW obtained by the implementation of a waveguide according to the invention as shown in FIG. 1, is given in the following table, as a function of the values of the ratios K and W. aa
  • Figures 3a and 3b show for different values of the ratio k the variation of the normalized cut-off frequency , ratio of the half-dimension of the square section waveguide to the cut-off wavelength of the guide, as a function of the ratio W , dimension of the side of the section of the square step related to this same half-dimension a of the waveguide section.
  • the waveguide according to the invention makes it possible to obtain a higher bandwidth than that of the guides hitherto used to solve similar problems.
  • the bandwidth of the guide according to the invention, a function of the ratios k and w reaches a value of 66% when these aa ratios have the respective values 0.5 and 0.26.
  • the waveguide, object of the invention further comprises a plurality of spacers 4 of dielectric material. These spacers keep the central conductive core in position.
  • the waveguide according to the invention comprises, inside the guide, a foam of dielectric material 5 allowing the central conductive core to be held in position. Any embodiment in which a support system for the central conducting core is used does not depart from the scope of the present invention.
  • Fc (TE 10 ) 5.588 GHz
  • Fc (TE 11 ) 11.300 GHz
  • the problem of finding the aa cutoff frequencies of the waveguide modes comes down to solving the two-dimensional Helmholtz equation in the cross section. of the guide. Two methods can preferably be used.
  • a first method allows a polynomial calculation of the field.
  • a second finite element method allows a longer but more expensive process to obtain more precise calculations.
  • a double-band wideband waveguide has thus been described which can be used in particular in any microwave circuit and in particular in broadband microwave connection circuits.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Waveguide Aerials (AREA)

Claims (6)

1. Breitbandwellenleiter mit Doppelpolarisation, bestehend aus einem Hohlleiter (1 ) mit Polygonquerschnitt, der bezüglich seines Symmetriezentrums C eine Symmetrie der Ordnung 4n, wobei n eine ganze Zahl ist, und zwei zueinander senkrechte Hauptfortpflanzungsachsen X und Y besitzt, dadurch gekennzeichnet, daß die innere Oberfläche dieses Hohlleiters (1) vier Eckleisten (2) aufweist, deren Längssymmetrieebenen entlang von Winkelhalbierenden der Hauptfortpflanzungsachsen verlaufen, und daß er einen leitenden zentralen Kern (3) mit polygonalem Querschnitt aufweist, wobei der Querschnitt dieses zentralen Kerns (3) und der des Hohlleiters homothetisch bezüglich des Symmetriezentrums C sind.
2. Wellenleiter nach Anspruch 1, in dem n= 1 ist, dadurch gekennzeichnet, daß die vier inneren Eckleisten (2) einen Quadratquerschnitt mit der Kantenlänge W besitzen und in den Winkeln des Hohlleiters (1) sitzen, und daß der leitende Zentralkern (3) ebenfalls einen Quadratquerschnitt, aber mit der Kantenlänge 2k besitzt.
3. Wellenleiter nach Anspruch 2, dadurch gekennzeichnet, daß das Verhältnis der Kantenlänge W der inneren Eckleisten (2) zur halben Kantenlänge a des Hohlleiterquerschnitts einen Wert besitzt, der zwischen 0,22 und 0,36 liegt.
4. Wellenleiter nach Anspruch 2, dadurch gekennzeichnet, daß das Verhältnis der Kantenlänge 2k des Querschnitts des Zentralkerns (3) zur Kantenlänge 2a des Hohlleiterquerschnitts einen Wert besitzt, der zwischen 0,2 und 0,6 liegt.
5. Wellenleiter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er eine Vielzahl von Abstandshaltern (4) aufweist, die den leitenden Zentralkern (3) mit dem Hohlleiter (1) mechanisch verbinden.
6. Wellenleiter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er einen Schaumstoff (5) aus einem dielektrischen Material zwischen dem leitenden Zentralkern (3) und dem Hohlleiter (1) aufweist.
EP80400448A 1979-04-13 1980-04-03 Breitbandwellenleiter mit zwei Polarisationsrichtungen Expired EP0018261B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7909493A FR2454188A1 (fr) 1979-04-13 1979-04-13 Guide d'onde a large bande a double polarisation et circuit hyperfrequence comportant un tel guide d'onde
FR7909493 1979-04-13

Publications (2)

Publication Number Publication Date
EP0018261A1 EP0018261A1 (de) 1980-10-29
EP0018261B1 true EP0018261B1 (de) 1984-03-14

Family

ID=9224337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400448A Expired EP0018261B1 (de) 1979-04-13 1980-04-03 Breitbandwellenleiter mit zwei Polarisationsrichtungen

Country Status (4)

Country Link
US (1) US4303900A (de)
EP (1) EP0018261B1 (de)
DE (1) DE3066913D1 (de)
FR (1) FR2454188A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523160A (en) * 1983-05-02 1985-06-11 George Ploussios Waveguide polarizer having conductive and dielectric loading slabs to alter polarization of waves
US4904966A (en) * 1987-09-24 1990-02-27 The United States Of America As Represented By The Secretary Of The Navy Suspended substrate elliptic rat-race coupler
US7061445B2 (en) * 2003-08-26 2006-06-13 Andrew Corporation Multiband/multichannel wireless feeder approach
US9178282B2 (en) * 2004-07-14 2015-11-03 William Marsh Rice University Method for coupling terahertz pulses into a coaxial waveguide
US7531803B2 (en) * 2006-07-14 2009-05-12 William Marsh Rice University Method and system for transmitting terahertz pulses

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1013338B (de) * 1952-12-27 1957-08-08 Pintsch Electro Gmbh Innenleiter, insbesondere fuer UKW-Leitungen, mit vergroesserter elektrischer Laenge
US3002163A (en) * 1960-01-08 1961-09-26 Polytechnic Inst Brooklyn Mode coupler for circular waveguides
US3150333A (en) * 1960-02-01 1964-09-22 Airtron Division Of Litton Pre Coupling orthogonal polarizations in a common square waveguide with modes in individual waveguides
US3569870A (en) * 1968-08-21 1971-03-09 Rca Corp Feed system
DE2055443C3 (de) * 1970-11-11 1982-02-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Polarisationswandler für Mikrowellen
FR2116441B1 (de) * 1970-12-03 1974-08-19 Licentia Gmbh
US4035598A (en) * 1974-10-22 1977-07-12 Johannes Menschner Maschinenfabrik Gmbh & Co. Kg. Apparatus for thermally treating polymeric workpieces with microwave energy
FR2294554A1 (fr) * 1974-12-10 1976-07-09 Thomson Csf Ligne coaxiale de section rectangulaire, application aux oscillateurs a mode anormal

Also Published As

Publication number Publication date
DE3066913D1 (en) 1984-04-19
FR2454188A1 (fr) 1980-11-07
FR2454188B1 (de) 1983-03-11
EP0018261A1 (de) 1980-10-29
US4303900A (en) 1981-12-01

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