EP0246561A2 - Guide d'onde - Google Patents

Guide d'onde Download PDF

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Publication number
EP0246561A2
EP0246561A2 EP87107005A EP87107005A EP0246561A2 EP 0246561 A2 EP0246561 A2 EP 0246561A2 EP 87107005 A EP87107005 A EP 87107005A EP 87107005 A EP87107005 A EP 87107005A EP 0246561 A2 EP0246561 A2 EP 0246561A2
Authority
EP
European Patent Office
Prior art keywords
waveguide
tongue
fin
wave
waveguide section
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Withdrawn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
EP87107005A
Other languages
German (de)
English (en)
Other versions
EP0246561A3 (fr
Inventor
Johann Prof. Dr.-Ing. Hinken
Frank Henze
Knut Jedamski
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.)
Hans Kolbe and Co
Original Assignee
Hans Kolbe and Co
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 Hans Kolbe and Co filed Critical Hans Kolbe and Co
Publication of EP0246561A2 publication Critical patent/EP0246561A2/fr
Publication of EP0246561A3 publication Critical patent/EP0246561A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
    • H01P1/173—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation using a conductive element

Definitions

  • the invention relates to a waveguide according to the preamble of claim 1.
  • Such trained waveguides are generally known, for. B. in use with a polarizer or polarization converter.
  • a polarizer or polarization converter is a device that converts horizontally or vertically polarized waves into circularly polarized waves or vice versa.
  • Such polarization converters are currently gaining more and more interest in connection with satellite communication.
  • the television programs are supplied to the installed satellites in the form of circularly polarized signals and the satellites also emit these signals in a circularly polarized form.
  • the above-mentioned polarizers or polarization converters are required on the transmitter side on the one hand and on the receiver side on the other hand.
  • the signals to be processed by the polarizers or polarization converters lie within a certain so-called useful frequency band, which for the television signals is, for example, in the range from 11.7 to 12.5 GHz.
  • a large number of channels, each of which differs in frequency, must be able to be transmitted properly within this useful frequency band.
  • the phase difference between the two orthogonal components of the incident wave should remain as constant as possible over the entire useful frequency band, and should be as much as 90 degrees as possible.
  • the phase difference changes with increasing frequency, ie the phase angle between two linearly polarized waves become smaller with increasing frequency.
  • the invention is therefore based on the object of providing a waveguide of the type mentioned at the beginning with a low input reflection, which enables an approximately constant course of the phase difference for a desired phase difference over the largest possible useful bandwidth.
  • a low input reflection and a high cross-polarization decoupling should be made possible over the widest possible bandwidth.
  • This object is achieved in a waveguide of the type mentioned by the characterizing features of claim 1.
  • This excitation of a higher natural wave provided according to the invention changes the phase response of the fundamental wave (H d1 ).
  • a resonance point above the useful frequency band has the effect that the frequency-dependent phase difference curve is now constant or approximately constant in the area of the useful frequency band.
  • the tongue starting from its base on an inner wall of the waveguide, has a central region in the immersion direction with a maximum extension to the base and identical side regions on both sides with continuously falling contours.
  • a tongue designed in this way has a defined area with which it immerses maximally into the interior of the waveguide.
  • the position of the resonance point can be selected.
  • two values of the central area of the tongue, with which the latter dips into the waveguide, are decisive for the exact determination of the resonance point. These values are the maximum extent of the central area in the immersion direction and the maximum extent of the central area in the longitudinal direction of the waveguide.
  • the central region of the tongue is stepped in relation to the side regions and is provided with an edge running parallel to the baseline, that the edges of the continuously falling side regions are curved, and that the side regions of the The tongue is offset at the ends perpendicular to the base line of the tongue. Due to the edges of the side areas that curve to the interior of the waveguide, a low input reflection is achieved with a short overall length. Furthermore, by changing the extent of the central region in the longitudinal direction and immersion depth, an exact adaptation to the desired values can be carried out.
  • the waveguide 10 has a square shape with an edge length 11 and a total length 12.
  • the interior of the waveguide l0 is designated by l3.
  • L protrudes into the interior l3 from the top left corner of a metallic tongue l4, which is attached to its base l5 in the corner of the waveguide l0 and forms an angle of 45 degrees with the adjacent walls.
  • the tongue l4 has a central region l6 and two side regions l7.
  • the central region l6 has an edge l8 running parallel to the base l5, and the two side regions l7 have continuously tapering edges l9.
  • the maximum extension of the central region in the z direction is designated by l.
  • the immersion depth of the tongue 14, which changes in the z direction, is designated by s (z).
  • S max denotes the greatest immersion depth of the tongue l4 in the central region l6.
  • a special embodiment of the tongue is shown and designated l4 ⁇ .
  • This tongue l4 ⁇ differs from that shown in Fig. 2 by pronounced shoulders 20 between the central region l6 ⁇ and the side regions l7 ⁇ and further by outwardly curved edges l9 ⁇ , which fall at right angles to the base l5 ⁇ in the end region of the tongue l4 ⁇ .
  • the embodiment shown in the drawing is a polarization converter for converting circularly polarized signals into horizontally and vertically polarized signals.
  • the figures l to 3 show the basic structure of a polarization converter with a sloping metallic septum (metallic tongue).
  • Incident circularly polarized H10 / H01 waves are converted to linearly polarized waves in the x and y directions, ie in H01 and H10 waves.
  • Fig. 5a shows the course of the experimentally determined lower limit frequency as a function of the extension of the tongue l4, l4 l in the immersion direction.
  • the fundamental wave with its components H d1 and H d2 has a cutoff frequency of around 9.4 GHz, while the higher wave H2 has a cutoff frequency of around 18.8 GHz.
  • the cutoff frequency of the higher wave H2 and the component H d1 of the fundamental wave decreases, while the cutoff frequency of the H d2 wave does not change.
  • the waveguide on which the experimentally determined values are based is indicated schematically in FIG. 5b.
  • the edge length has a value of l5.5 mm.
  • the higher natural wave H2 is excited by a certain dimensioning and immersion depth of the tongue l4, l4 ⁇ , so that a resonance point occurs at the frequency f r above a useful frequency band 2l (see FIG. 6).
  • This resonance point is due to the fact that the higher wave H2 is only capable of spreading in the area and in the vicinity of the maximum immersion depth of the tongue l4, l4 ⁇ and thus there is a resonance caused.
  • 6 shows the course of the phase difference as a function of the frequency. With the letters a, b, c the calculated course of the phase difference is plotted, with no excitation of the higher wave H2 was taken into account.
  • the letters a, b and c are each assigned different values of the length l of the central region l6, l6 ⁇ of the tongue l4, l4 ⁇ which increase with the sequence of letters; the middle area is the area over which the maximum immersion depth of the tongue l4, l4 ⁇ extends in the longitudinal direction of the waveguide l0.
  • s max is z. B. selected so that all curves a, b and c have the same value at 12 GHz.
  • the immersion depth (s) is greater and the length (l) is smaller than with previously known tongues in the waveguide.
  • the course of the calculated and measured return loss a R (reflection loss, adaptation) is also shown as a function of the frequency.
  • the desired values are also shown here in the region of the useful frequency band 2l.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
EP87107005A 1986-05-22 1987-05-14 Guide d'onde Withdrawn EP0246561A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863617143 DE3617143A1 (de) 1986-05-22 1986-05-22 Hohlleiter
DE3617143 1986-05-22

Publications (2)

Publication Number Publication Date
EP0246561A2 true EP0246561A2 (fr) 1987-11-25
EP0246561A3 EP0246561A3 (fr) 1988-11-17

Family

ID=6301327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107005A Withdrawn EP0246561A3 (fr) 1986-05-22 1987-05-14 Guide d'onde

Country Status (2)

Country Link
EP (1) EP0246561A3 (fr)
DE (1) DE3617143A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL72696C (fr) * 1945-04-26
GB663889A (en) * 1949-05-09 1951-12-27 Marconi Wireless Telegraph Co Improvements in or relating to wave guides
US2774067A (en) * 1949-08-17 1956-12-11 Rca Corp Microwave scanning antenna system
DE2055443C3 (de) * 1970-11-11 1982-02-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Polarisationswandler für Mikrowellen
US4356459A (en) * 1981-03-23 1982-10-26 Ford Aerospace & Communications Corp. Flat phase response septum polarizer

Also Published As

Publication number Publication date
DE3617143A1 (de) 1987-11-26
DE3617143C2 (fr) 1990-07-26
EP0246561A3 (fr) 1988-11-17

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Inventor name: JEDAMSKI, KNUT

Inventor name: HINKEN, JOHANN, PROF. DR.-ING.

Inventor name: HENZE, FRANK