EP0228947A1 - Superheterodynempfänger zweier Mikrowellensignale gegensinniger Zirkularpolarisation - Google Patents

Superheterodynempfänger zweier Mikrowellensignale gegensinniger Zirkularpolarisation Download PDF

Info

Publication number
EP0228947A1
EP0228947A1 EP86402728A EP86402728A EP0228947A1 EP 0228947 A1 EP0228947 A1 EP 0228947A1 EP 86402728 A EP86402728 A EP 86402728A EP 86402728 A EP86402728 A EP 86402728A EP 0228947 A1 EP0228947 A1 EP 0228947A1
Authority
EP
European Patent Office
Prior art keywords
probes
waveguide
local oscillator
printed circuit
waves
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
EP86402728A
Other languages
English (en)
French (fr)
Other versions
EP0228947B1 (de
Inventor
Laurent Kerger
Alain Pavion
Patrick Potier
Didier Cheval
Lassima Sanogo
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.)
S E R E L Ste
Original Assignee
S E R E L Ste
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 S E R E L Ste filed Critical S E R E L Ste
Publication of EP0228947A1 publication Critical patent/EP0228947A1/de
Application granted granted Critical
Publication of EP0228947B1 publication Critical patent/EP0228947B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 device for the simultaneous reception of two waves with circular or elliptical polarization in opposite directions.
  • the reception devices are capable of receiving circularly polarized waves in opposite directions.
  • Such a device is located in the vicinity of the antenna. It comprises a waveguide means transforming the waves with circular polarization into waves with rectilinear polarization. Each wave with rectilinear polarization is introduced at the input of a circuit which comprises an amplifier, in particular at low noise, a filter, a local oscillator, a mixer and an amplifier at intermediate frequency IF. It has been found that the television images obtained from the signals originating from these circuits have defects, in particular in the form of vertical lines. The inventors have discovered that these defects arise from the fact that, on the one hand, the frequencies of the local oscillators cannot be strictly equal and, on the other hand, despite the care that can be taken in the construction of the device. separation the signals of each channel act on the other channel. This results in interference or beats which cause visible defects on a television picture.
  • the invention is characterized in that a common local oscillator is provided for the two circuits. It has been found that with this arrangement the restored image has far fewer defects than when two local oscillators are provided. Such a result is surprising because, usually, to correct faults arising from interference between two channels, the separation between these channels is reinforced; on the contrary, the invention provides an element common to both paths.
  • the reduction in the number of components of the separation device contributes to the reduction of its volume, which is advantageous, on the one hand, to minimize wind absorption and, on the other hand, so as not to risk obscuring the beam received.
  • the waveguide has a generally external substantially parallelepiped shape and two separate wave detection probes, with rectilinear polarization of different directions or opposite directions, extend perpendicularly to the external faces of the parallelepiped, and against each from these faces is applied a printed circuit board comprising the circuit mentioned above.
  • the local oscillator is on a third printed circuit board and preferably this local oscillator is equidistant from the probes.
  • the example which will be described in relation to the figures relates to the reception of television broadcasts transmitted via a geostationary satellite, the television signals being carried by microwave waves with circular gyroplane or dextrorotatory polarization .
  • a parabolic antenna 10 (FIG. 1) is provided, the axis of which is directed towards the satellite and which thus receives the waves emitted by the latter to reflect them on its focus.
  • a device for receiving microwave waves 11 is therefore placed at the focal point of the parabolic antenna 10.
  • Such a device 11 comprises a receiving horn 12 (FIG. 2) constituting the inlet of the device 11.
  • This horn 12 has the shape of a truncated cone. It is extended, at the rear, by a waveguide 13 of circular section which may contain a bandpass or highpass filter.
  • This waveguide 13 is connected to a waveguide 15 of rectangular section via a waveguide 14 allowing the transition from the circular section to the rectangular section.
  • the waveguide 15 of rectangular section has, over part of its length, a depolarizing metal strip 16 parallel to two walls 17 and 18 (FIG. 3) of the rectangular parallelepiped that constitutes the waveguide 15 and at equal distance from these walls.
  • the front edge 19 of the blade 16 has a general bevel shape (FIGS. 2 and 6) which allows depolarization: the waves with circular polarization to the right are transformed into waves with rectilinear polarization remaining on only one side of the blade 16, the side being a function of the direction (right) of the circular polarization.
  • the front edge 19 has a staircase shape.
  • FIGS. 2a to 2j are diagrams which allow a good understanding of the depolarizing role of the blade 16 and of its entry edge 19.
  • a circularly polarized wave (right or left) can be broken down into two linearly polarized waves (Figure 2j,) represented by the two electric field vectors eh and Ev whose directions form an angle of f radians between them.
  • the direction of rotation (right or left) of the circular wave depends on the sign of the phase shift between these two vectors Eh and EV .
  • Figures 2a to 2 d show the propagation of the vector component Eh and figures 2e at 2 h show the propagation of the vector component Ev .
  • Figures 2b and 2t are sections of the guide 15 in a cross section corresponding to the front part of the bevel 19; the diagrams of FIGS. 2c and 2 9 correspond to straight sections in the posterior zone of the bevel 19 while FIGS. 2 d , 2 h and 2; correspond to the waveguide at the rear of bevel 19.
  • the effect of the blade 16 on the horizontal vector Eh is to separate it into two vectors EH1 and EH2 in the same directions on either side of the blade 16.
  • the component of the input wave corresponding to the vector Eh is divided into two waves with rectilinear polarization in phase.
  • the effect of the blade 16 on the wave with vertical rectilinear polarization Ev is to transform the latter into two waves with horizontal rectilinear polarization in opposite directions ( Figures 2 e to 2 h ).
  • Figures 2 h and 2 d to the left of the blade 16 we obtain a wave with rectilinear polarization horizontal horizon E'H1 in tune with the wave E'H1
  • the wave with rectilinear polarization EH2 By cons to the right of the blade 16 the wave with rectilinear polarization EH2 .
  • Rectilinear probes 21 and 22 pass through the walls 17 and 18 perpendicularly to the latter, and therefore parallel to the electric field vector, on each side of the metal strip 16, behind the bevelled edge 19. These probes 21 and 22 are aligned, and therefore in positions symmetrical to each other with respect to the blade 16.
  • the probe 21 is connected, at its end 21a outside the waveguide 15, to a circuit located on a printed circuit board 23 (FIGS. 3 and 5) parallel to the wall 17 and at a short distance from the latter.
  • the probe 22 is associated with a printed circuit board 24 identical to the board 23 and of position symmetrical with respect to the plane of the blade 16.
  • FIG 4 there is shown, on the one hand, the circuit 23 1 superheterodyne located on the wafer 23, on the other hand, the circuit 24 1 on the wafer 24 and, on the other hand finally, the local oscillator common 25 to these two circuits which is on a printed circuit board 26 (FIGS. 3 and 5) perpendicular to the boards 23 and 24, that is to say parallel to another wall 27 of the waveguide 15 of section rectangular, and at a short distance from this wall 27.
  • the plate 26 is applied against the external face of the wall 27.
  • connection bridges are provided, respectively between the plate 26 and the plate 23, and 31 between the plate 26 and the plate 24. These bridges overlap edges in contact with plates 23 and 26 and 24 and 26.
  • the circuit 23 1 includes a low noise amplifier 32 receiving the signal from the probe 21 and which is connected to the first input 34 i of a mixer 34 via a bandpass filter 33.
  • the second input 34 2 of the mixer 34 is connected to a first output of the power divider associated with the local oscillator 25.
  • the output 34 3 of the mixer is connected to the output of the circuit by means of an intermediate frequency amplifier FI 35.
  • the circuit 24 1 includes an amplifier 36 with low noise, a bandpass filter 37, a mixer 38, one input of which is connected to a second output of the power divider associated with the local oscillator 25 and an intermediate frequency amplifier.
  • FI 39 the circuit 24 1 includes an amplifier 36 with low noise, a bandpass filter 37, a mixer 38, one input of which is connected to a second output of the power divider associated with the local oscillator 25 and an intermediate frequency amplifier.
  • the printed circuit board 23 rests on a wall 40 parallel to the wall 17 and at a short distance from the latter; a cover 41 is associated with this wall 40. In this way the printed circuit board 23 is sealed in a box formed by the wall 40 and the cover 41. Similarly the boards 24 and 26 are enclosed in respective boxes with base wall and cover.
  • the set of waveguides 13, 14, 15 and printed circuit boards with their cases is placed in another protective case 45 (FIG. 2) forming a single piece with the horn 12.
  • the arrangement of the invention which consists in providing a local oscillator common 25 to circuits 23 1 and 24 1 avoids interference between these two circuits.
  • the arrangement which consists in providing probes 21, 22 perpendicular to the walls 17, 18 and connected to circuits on parallel plates 23, 24 and at a short distance from said walls 17, 18, or applied against the latter allows an embodiment compact of the receiving device, that is to say to minimize the volume occupied by this device 11.
  • the resulting advantage is a reduction in the wind resistance and a reduction in the risk of obscuring the wave coming from from the satellite before it is received by the device.
  • a waveguide of rectangular or square section is not used, but a waveguide 50 of circular section which is separated , in longitudinal direction, in two parts by a wall 51 having an elongated slot 52 in a determined direction.
  • a probe 53 passes through the wall of the waveguide, in a radial direction, and is connected to a printed circuit board 54 which is applied against a flat outer face 55 of the device 15 ′ for separating the waves with circular polarization in opposite directions.
  • this wall 51 leaves the passage to waves with perpendicular polarization.
  • a probe 56 crosses radially the wall of the waveguide 50 in a direction perpendicular to that of the probe 53, but downstream of the wall 51.
  • the part of the waveguide 50 which contains the end of the probe 56 is closed by an end wall 57 constituting a short circuit for all the waves, whatever their polarization.
  • the probe 56 is, like the probe 53, connected to a circuit located on a printed circuit board 58 applied against a flat external face 59 perpendicular to the face 55.
  • the circuits on the pads 54 and 58 are similar to the circuits 23 1 and 24 1 described in relation to FIG. 4.
  • a common local oscillator 25 ' is provided.
  • This is placed on another printed circuit board 60 connected to the circuits on the boards 54 and 58 by bridges 61 and 62 (FIG. 8).
  • the bridge 61 overlaps the contacting edges 54a and 60a of the wafers 54 and 60; similarly the bridge 62 overlaps the edges in contact 58 b and 60 b of the plates 58 and 60.
  • the device 15 ′ has an oblique face 70 of short length relative to the faces 55 and 59 (FIG. 8) forming an interruption of the edge 71 common to said faces 55 and 59.
  • this face 70 is inclined by about 45 ° relative to the adjacent faces 55 and 59.
  • This face 70 is inside the rectangular parallelepiped that constitutes room 15 '; the depth of the withdrawal is sufficient so that the plate 60 and the oscillator 25 'do not project beyond this rectangular parallelepiped, which maintains the compact nature of the device.
  • the waveguide 50 is formed from three pieces of cast aluminum, the first 63 ending in a nose 64 closed by the wall 51 and the second, 65, having a countersink 66 receiving by force adjustment the nose 64.
  • the third piece is the end plug 57.
  • the local oscillator 25 common to the circuits of the two channels is on a printed circuit board while the other circuit elements are on two separate boards. Other distributions of the circuit elements are however possible. Thus in one example the common local oscillator 25 and the IF amplifiers 35, 39 are on the same printed circuit board.

Landscapes

  • Waveguide Aerials (AREA)
EP19860402728 1985-12-10 1986-12-09 Superheterodynempfänger zweier Mikrowellensignale gegensinniger Zirkularpolarisation Expired - Lifetime EP0228947B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518255 1985-12-10
FR8518255A FR2591407B1 (fr) 1985-12-10 1985-12-10 Dispositif de reception, a guide d'onde et circuits superheterodynes, de deux signaux hyperfrequences a polarisation de sens inverses

Publications (2)

Publication Number Publication Date
EP0228947A1 true EP0228947A1 (de) 1987-07-15
EP0228947B1 EP0228947B1 (de) 1993-08-11

Family

ID=9325617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860402728 Expired - Lifetime EP0228947B1 (de) 1985-12-10 1986-12-09 Superheterodynempfänger zweier Mikrowellensignale gegensinniger Zirkularpolarisation

Country Status (3)

Country Link
EP (1) EP0228947B1 (de)
DE (1) DE3688881T2 (de)
FR (1) FR2591407B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252269A1 (de) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Konvertersystem
GB2235340A (en) * 1989-08-22 1991-02-27 Funai Electric Engineering Com Signal receiver for satellite broadcast
EP0517976A1 (de) * 1983-10-31 1992-12-16 Raytheon Company Pulsradar
WO1996031957A1 (en) * 1995-04-07 1996-10-10 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception
US6233435B1 (en) 1997-10-14 2001-05-15 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059186A (en) * 1960-11-30 1962-10-16 Philip J Allen Polarization resolver and mixer
US3092828A (en) * 1961-04-28 1963-06-04 Philip J Allen Polarization modulation apparatus
US3955202A (en) * 1975-04-15 1976-05-04 Macrowave Development Laboratories, Inc. Circularly polarized wave launcher
US4126835A (en) * 1977-06-20 1978-11-21 Ford Motor Company Balanced phase septum polarizer
EP0059927A1 (de) * 1981-03-07 1982-09-15 ANT Nachrichtentechnik GmbH Mikrowellen-Empfangseinrichtung
EP0094047A1 (de) * 1982-05-07 1983-11-16 Motorola Inc. In einem Mikrowellengerät eingesetzter Mischer
EP0110324A1 (de) * 1982-11-30 1984-06-13 Kabushiki Kaisha Toshiba Mikrowellenempfänger mit einem Hohlleiterfilter
EP0131633A1 (de) * 1983-01-20 1985-01-23 Matsushita Electric Industrial Co., Ltd. Frequenzumwandler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059186A (en) * 1960-11-30 1962-10-16 Philip J Allen Polarization resolver and mixer
US3092828A (en) * 1961-04-28 1963-06-04 Philip J Allen Polarization modulation apparatus
US3955202A (en) * 1975-04-15 1976-05-04 Macrowave Development Laboratories, Inc. Circularly polarized wave launcher
US4126835A (en) * 1977-06-20 1978-11-21 Ford Motor Company Balanced phase septum polarizer
EP0059927A1 (de) * 1981-03-07 1982-09-15 ANT Nachrichtentechnik GmbH Mikrowellen-Empfangseinrichtung
EP0094047A1 (de) * 1982-05-07 1983-11-16 Motorola Inc. In einem Mikrowellengerät eingesetzter Mischer
EP0110324A1 (de) * 1982-11-30 1984-06-13 Kabushiki Kaisha Toshiba Mikrowellenempfänger mit einem Hohlleiterfilter
EP0131633A1 (de) * 1983-01-20 1985-01-23 Matsushita Electric Industrial Co., Ltd. Frequenzumwandler

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0517976A1 (de) * 1983-10-31 1992-12-16 Raytheon Company Pulsradar
EP0252269A1 (de) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Konvertersystem
GB2235340A (en) * 1989-08-22 1991-02-27 Funai Electric Engineering Com Signal receiver for satellite broadcast
GB2235340B (en) * 1989-08-22 1994-05-11 Funai Electric Engineering Com Satellite broadcast signal receiver
WO1996031957A1 (en) * 1995-04-07 1996-10-10 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception
US5701591A (en) * 1995-04-07 1997-12-23 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception
AU713294B2 (en) * 1995-04-07 1999-11-25 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception
US6006070A (en) * 1995-04-07 1999-12-21 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception
AP895A (en) * 1995-04-07 2000-11-17 Telecommunications Equipment Corp Multifunction interactive communications system with circularly/elliptically polarized signal transmission and reception.
US6233435B1 (en) 1997-10-14 2001-05-15 Telecommunications Equipment Corporation Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception

Also Published As

Publication number Publication date
DE3688881D1 (de) 1993-09-16
EP0228947B1 (de) 1993-08-11
FR2591407A1 (fr) 1987-06-12
DE3688881T2 (de) 1993-11-25
FR2591407B1 (fr) 1988-08-05

Similar Documents

Publication Publication Date Title
CA2267536A1 (fr) Dispositif de radiocommunication et antenne bifrequence realisee selon la technique des microrubans
WO1999035711A1 (fr) Emetteur/recepteur d'ondes electromagnetiques
WO1991006988A1 (fr) Antenne de reception multifocale a direction de pointage unique pour plusieurs satellites
FR2488055A1 (fr) Transducteur d'antenne pour antenne d'emission-reception et source primaire d'antenne equipee d'un tel transducteur
EP0707357B1 (de) Antennensystem mit mehreren Speisesystemen, integriert in einem rauscharmen Umsetzer (LNC)
CH615534A5 (de)
FR2704358A1 (fr) Duplexeur de polarissation à guide d'ondes.
EP0228947B1 (de) Superheterodynempfänger zweier Mikrowellensignale gegensinniger Zirkularpolarisation
EP0074295B1 (de) Passiver Mikrowellenduplexer mit Halbleitern
CA1260082A (fr) Dispositif a joint tournant hyperfrequence
FR2777700A1 (fr) Agencement de convertisseur de frequences pour antennes parabolique
EP0174250B1 (de) Vorrichtung zum Empfang von dual polarisierten Mikrowellensignalen
FR2591406A1 (fr) Dispositif de reception simultanee de deux signaux hyperfrequences a polarisation circulaire de sens inverses
EP0072316A1 (de) Antenne mit elektronischer Schwenkung und mehreren Eingängen und Radar mit einer solchen Antenne
CH671106A5 (de)
EP0073165B1 (de) Mikrowellenschalter
FR3003700A1 (fr) Dispositif de reduction de signature radar d'antenne et systeme antennaire associe
EP3249823B1 (de) Kompakter doppelpolarisierter funkfrequenzerreger mit mehrfachfrequenzen für antennenprimärstrahler, und mit einem solchen funkfrequenzerreger ausgestatteter antennenprimärstrahler
EP1152483B1 (de) Zweiband-Mikrowellenstrahlelement
FR2522883A1 (fr) Joint pivotant pour guides d'ondes hyperfrequences
FR2723801A1 (fr) Diplexeur a intervalle d'un octave entre bandes.
FR2716049A1 (fr) Convertisseur.
EP0068940B1 (de) Primärstrahler für Frequenz-Doppelausnutzung
EP0192186A1 (de) Polarisationsweiche
EP3035445B1 (de) Anschlusskoppler mit orthogonalmodus, und entsprechender polarisations- und frequenztrennschalter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19870813

17Q First examination report despatched

Effective date: 19890629

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

REF Corresponds to:

Ref document number: 3688881

Country of ref document: DE

Date of ref document: 19930916

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19931019

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 19971104

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20011109

Year of fee payment: 16

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020124

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021209

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030701

GBPC Gb: european patent ceased through non-payment of renewal fee