EP0575788A1 - Lanceur multimode XPD-optimisé pour diversité d'angle - Google Patents

Lanceur multimode XPD-optimisé pour diversité d'angle Download PDF

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Publication number
EP0575788A1
EP0575788A1 EP93108855A EP93108855A EP0575788A1 EP 0575788 A1 EP0575788 A1 EP 0575788A1 EP 93108855 A EP93108855 A EP 93108855A EP 93108855 A EP93108855 A EP 93108855A EP 0575788 A1 EP0575788 A1 EP 0575788A1
Authority
EP
European Patent Office
Prior art keywords
rectangular waveguide
multimode
angle diversity
square
waveguide
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.)
Granted
Application number
EP93108855A
Other languages
German (de)
English (en)
Other versions
EP0575788B1 (fr
Inventor
Eberhard Dipl.-Ing. Tauscheck
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0575788A1 publication Critical patent/EP0575788A1/fr
Application granted granted Critical
Publication of EP0575788B1 publication Critical patent/EP0575788B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/04—Multimode antennas
    • 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

Definitions

  • the invention relates to an XPD-optimized double-polarized broadband angle diversity exciter according to the multi-mode principle with a square horn with transition to rectangular waveguide and a multi-type waveguide branching with a rectangular waveguide and two square waveguides separated from one another by a separating web.
  • angular diversity antennas based on the sum difference diagram principle ensures transmission security to effectively improve directional radio links with disruptive multipath propagation.
  • the usual double-polarized exciter of a mirror antenna is replaced by an angular diversity exciter, which simultaneously emits two received signals recorded with different digram characteristics for each polarization.
  • Figure 1 shows the switching principle of the angle diversity with combiner.
  • the exciter 1 of an antenna arrangement having a main reflector 2 and a subreflector 3 has the connections vertical polarization (sum output V S and difference output V D ) and horizontal polarization (sum output H S and difference output H D ).
  • the outputs V S and H S correspond to the connections of a conventional double-polarized directional radio antenna.
  • a difference diagram of the elevation level is assigned to the outputs V D and H D , the diversity outputs.
  • V S and V D as well as H S and H D are each via a maximum power combiner K V and K H , in each of which the channel branches 5 and converters 6 connected to a carrier supply 7 are connected upstream, the resulting output signals u H and u V of the combiners 4 in the case of large phase errors of the multipath field in the area of the receiving antenna aperture, better useful signal-to-noise ratio than comparable directional radio antenna signals without an angle diversity circuit. Since sum and difference signals are constantly combined into a received signal via the combiners, the interference levels of the assigned cross-polarization of both outputs are always "on line". For this reason, with dual orthogonal-polarized links it is necessary to maintain very good cross-polarization decoupling values for the V S , H S outputs and also the diversity outputs V D , H D of the angle diversity antennas.
  • the cause of this disturbance can be seen in the following: To set the linearly polarized H11E11 wave in the rectangular waveguide R exact relations of the amplitude and phase values of the primarily excited individual modes E11 and H11 in the excitation zone are required. If this balance is disturbed, the resulting aperture field of the exciter contains cross-polarization components of the typical distribution of E11 or H11 waves. In the spatial far field diagram of E11 or H11 waves. In the spatial Frenfeld diagram of the angle diversity antenna, this causes a too narrow azimuth width of the solid angle with sufficient cross-polarization attenuation for the V D output.
  • the invention has for its object to provide a solution for an arrangement of the type described above, with which these faults can be eliminated in a simple manner.
  • This object is achieved according to the invention in such a way that when the H01, H10, H20 and H11E11 modes are excited by the two square waveguides in a multimode rectangular waveguide, the volume regions in the transition region of the square waveguide to the rectangular waveguide in the corners are filled on both sides of the separator with highly damping, strictly localized ferromagnetic damping material.
  • a material with the desired properties can be produced, for example, by mixing carbonyl iron and various synthetic resins.
  • FIG. 3 the transition region of the two square waveguides Q1, Q2 to the multimode rectangular waveguide R is shown in a partial representation, the waveguides being drawn in broken lines. Between the two square waveguides Q1, Q2 there is a separator S. The volume areas in the corners of the separator S in the transition area of the two square waveguides Q1, Q2 to the rectangular waveguide R are labeled V1, V2 and identified by circles. In these corners V1, V2, interference currents i Sl , i Sn occur which run in the longitudinal and transverse directions of the waveguide and in the direction of the crossbar (cf. the arrows shown in FIG. 3).
  • Figure 4 shows a partial view with the same perspective as Figure 3, the transition region between the square waveguides Q1, Q2 and the rectangular waveguide R, in which a damping element D is arranged encompassing the crosspiece S in the corner regions.
  • the damping element D is designed as a flat plate of U-shaped shape, and lies with a flat side on the broad side of the rectangular waveguide R and on the adjacent sides of the two square waveguides Q1, Q2.
  • the central recess is formed so that the two legs of the U-shape thereby formed enclose the crossbar S in its end region.
  • the damping element fills a small volume of the excitation zone in the area of the corners V1 and V2 so that it extends into the two square waveguides Q1, Q2, encloses part of the tear-off edge of the separating web S and protrudes slightly into the rectangular waveguide R.
  • the resulting U-shaped molded part consists of highly damping ferromagnetic material. In the figure, only one, in the area of the corner V1 damping element is shown. A correspondingly designed damping element is arranged opposite in the area of the corner V2.
  • the multimode rectangular waveguide R can have a constant, stepped or continuously expanding cross-section to the horn. It can be very short or, if necessary, can be omitted entirely.
  • the ferromagnetic damping material then protrudes into the space in front of the aperture.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
EP93108855A 1992-06-26 1993-06-02 Lanceur multimode XPD-optimisé pour diversité d'angle Expired - Lifetime EP0575788B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4221122 1992-06-26
DE4221122 1992-06-26

Publications (2)

Publication Number Publication Date
EP0575788A1 true EP0575788A1 (fr) 1993-12-29
EP0575788B1 EP0575788B1 (fr) 1997-03-19

Family

ID=6461952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108855A Expired - Lifetime EP0575788B1 (fr) 1992-06-26 1993-06-02 Lanceur multimode XPD-optimisé pour diversité d'angle

Country Status (4)

Country Link
EP (1) EP0575788B1 (fr)
AU (1) AU659019B2 (fr)
BR (1) BR9302665A (fr)
DE (1) DE59305840D1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088082A (en) * 1959-10-05 1963-04-30 Philco Corp Bandpass waveguide filter having iris and posts for resonating fundamental and vanes for absorbing harmonics
US4167715A (en) * 1978-06-22 1979-09-11 Bell Telephone Laboratories, Incorporated Wideband polarization coupler
EP0352976A2 (fr) * 1988-07-26 1990-01-31 AT&T Corp. Séparateur de signaux à diversité d'angle utilisant une conversion de mode
EP0422431A2 (fr) * 1989-10-09 1991-04-17 Robert Bosch Gmbh Dispositif à diversité angulaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088082A (en) * 1959-10-05 1963-04-30 Philco Corp Bandpass waveguide filter having iris and posts for resonating fundamental and vanes for absorbing harmonics
US4167715A (en) * 1978-06-22 1979-09-11 Bell Telephone Laboratories, Incorporated Wideband polarization coupler
EP0352976A2 (fr) * 1988-07-26 1990-01-31 AT&T Corp. Séparateur de signaux à diversité d'angle utilisant une conversion de mode
EP0422431A2 (fr) * 1989-10-09 1991-04-17 Robert Bosch Gmbh Dispositif à diversité angulaire

Also Published As

Publication number Publication date
AU4151693A (en) 1994-01-06
BR9302665A (pt) 1994-01-11
DE59305840D1 (de) 1997-04-24
AU659019B2 (en) 1995-05-04
EP0575788B1 (fr) 1997-03-19

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