EP0018261A1 - Breitbandwellenleiter mit zwei Polarisationsrichtungen - Google Patents

Breitbandwellenleiter mit zwei Polarisationsrichtungen Download PDF

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Publication number
EP0018261A1
EP0018261A1 EP80400448A EP80400448A EP0018261A1 EP 0018261 A1 EP0018261 A1 EP 0018261A1 EP 80400448 A EP80400448 A EP 80400448A EP 80400448 A EP80400448 A EP 80400448A EP 0018261 A1 EP0018261 A1 EP 0018261A1
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EP
European Patent Office
Prior art keywords
waveguide
symmetry
section
order
respect
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Granted
Application number
EP80400448A
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English (en)
French (fr)
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EP0018261B1 (de
Inventor
Jacky Tourneur
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Thales SA
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Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
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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.
  • the modes known as TE and TM modes respectively transverse electrical and transverse magnetic.
  • Each propagation mode has a cutoff frequency below which propagation takes place with attenuation.
  • the field of use of a waveguide or bandwidth is the frequency range which separates the lowest cutoff frequency, called the fundamental mode, from the frequency next cutoff, called the first higher order mode. In this interval, the only possible propagation mode is that of the fundamental mode.
  • Bandwidth is defined by the ratio: where ⁇ c2 and ⁇ cl 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 that a rotation around this same axis of the section of the waveguide by an angle of 2 ⁇ does not change the properties of the waveguide 4 n, the polarizations of this guide wave being globally 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 conditions of symmetry of radio propagation are maintained, even beyond the TE20 mode cutoff frequency.
  • bending the guide capable of creating an asymmetry, causes the appearance of the TE 20 mode.
  • a guide can therefore only be used, outside of its bandwidth, under very specific conditions of mechanical and / or radio symmetry.
  • the present invention overcomes the aforementioned drawbacks and in particular to obtain bandwidths greater than 60%.
  • Another object of the present invention is the implementation of a double-polarized broadband waveguide, in which the width of the band is in direct relation to the geometric parameters of the waveguide.
  • the wide-band double polarization waveguide comprises: a waveguide of polygonal section having, with respect to a center of symmetry C, a symmetry of order 4n where n is any integer.
  • the broadband waveguide has inside the waveguide of polygonal section, on the one hand a plurality of conductive steps, the section of which determines with the polygonal section a propagation section of the waveguide.
  • Each of the steps is arranged on the internal face of the sides of the waveguide, according to a symmetry of order 4 with respect to this same center of symmetry.
  • the longitudinal plane of symmetry of each step is oriented in the propagation section of the waveguide, in the direction of the bisectors of the main axes of the waveguide.
  • the broadband waveguide comprises, on the other hand, a central conductive core whose section has, relative to this same center of symmetry, the same symmetry of order 4n.
  • the wide-band double polarization waveguide object of the invention, comprises a waveguide of polygonal section 1 having, with respect to a center of symmetry C, a symmetry of order 4n where n is an integer.
  • the waveguide according to the invention contains inside the waveguide 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 waveguide, 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 waveguide, 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 10 and TE 01 ' 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 comprises, on the other hand, inside the waveguide of polygonal section, a central conductive core 3, the section of which has with respect to the center of symmetry C the same symmetry of order 4n, the sections of the central conducting core and of the waveguide of polygonal section being homothetic with respect to this center of symmetry C.
  • the waveguide of polygonal section has a square section of side 2a.
  • This section presents, with respect to the center of symmetry C, a symmetry of order 4.
  • the waveguide comprises, inside each dihedral angle formed by two consecutive sides of the square section, a conductive step 2 of section also square on side W.
  • the four steps arranged in the section of the waveguide, at the end of the diagonals of this section, determine, with the square section of the waveguide, a section of propagation of the waveguide. having, with respect to this same center of symmetry C, a symmetry of order 4.
  • the waveguide of polygonal section comprises, on the other hand, a central conductive core 3 whose square section on the side 2k has, with respect to this same center of symmetry C, the same symmetry of order 4.
  • the diagonals of the square section of the waveguide l 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 the dimension of the guide, according to FIG. 1, at the cut-off wavelength of this same guide, the standardized cut-off frequency being noted , and whose abscissa are graduated in relation to the dimension of the side of the step W at the same dimension 2a of the waveguide.
  • FIG. 2a represents the variations in the cutoff frequencies of the higher order 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 side section 2k related to this same dimension of the square section and side waveguide 2a.
  • FIG. 2b represents the different normalized cut-off frequencies for higher order 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 inside 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 ratio k.
  • Figures 3a and 3b represent for different values of the ratio 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, depending on the ratio , dimension of the side of the section of the square step related to this same half-dimension a of the section of the waveguide.
  • 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 reports and , reaches a value of 66% when these ratios have respectively a value of 0.5 and 0.26.
  • a first method allows a polynomial calculation of the field.
  • a second method allows for 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)
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
FR7909493 1979-04-13
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

Publications (2)

Publication Number Publication Date
EP0018261A1 true EP0018261A1 (de) 1980-10-29
EP0018261B1 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
WO2006019776A2 (en) * 2004-07-14 2006-02-23 William Marsh Rice University A 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

Citations (6)

* 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
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
FR2113962A1 (de) * 1970-11-11 1972-06-30 Licentia Gmbh
FR2116441A1 (de) * 1970-12-03 1972-07-13 Licentia Gmbh
FR2294554A1 (fr) * 1974-12-10 1976-07-09 Thomson Csf Ligne coaxiale de section rectangulaire, application aux oscillateurs a mode anormal
US4035598A (en) * 1974-10-22 1977-07-12 Johannes Menschner Maschinenfabrik Gmbh & Co. Kg. Apparatus for thermally treating polymeric workpieces with microwave energy

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002163A (en) * 1960-01-08 1961-09-26 Polytechnic Inst Brooklyn Mode coupler for circular waveguides
US3569870A (en) * 1968-08-21 1971-03-09 Rca Corp Feed system

Patent Citations (6)

* 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
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
FR2113962A1 (de) * 1970-11-11 1972-06-30 Licentia Gmbh
FR2116441A1 (de) * 1970-12-03 1972-07-13 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
US4303900A (en) 1981-12-01
EP0018261B1 (de) 1984-03-14
FR2454188A1 (fr) 1980-11-07
FR2454188B1 (de) 1983-03-11

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