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EP0235846A2 - Mikrowellenempfänger zweier Polarisationen zum direkten Empfang von Signalen eines Übertragungssatelliten - Google Patents

Mikrowellenempfänger zweier Polarisationen zum direkten Empfang von Signalen eines Übertragungssatelliten Download PDF

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Publication number
EP0235846A2
EP0235846A2 EP87200231A EP87200231A EP0235846A2 EP 0235846 A2 EP0235846 A2 EP 0235846A2 EP 87200231 A EP87200231 A EP 87200231A EP 87200231 A EP87200231 A EP 87200231A EP 0235846 A2 EP0235846 A2 EP 0235846A2
Authority
EP
European Patent Office
Prior art keywords
receiver
wave
guide structure
acterized
char
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Withdrawn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
EP87200231A
Other languages
English (en)
French (fr)
Other versions
EP0235846A3 (de
Inventor
Paolo Bonato
Andrea Giavarini
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 Telecomunicazioni SpA
Original Assignee
Siemens Telecomunicazioni SpA
GTE Telecommunicazioni SpA
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 Siemens Telecomunicazioni SpA, GTE Telecommunicazioni SpA filed Critical Siemens Telecomunicazioni SpA
Publication of EP0235846A2 publication Critical patent/EP0235846A2/de
Publication of EP0235846A3 publication Critical patent/EP0235846A3/de
Withdrawn legal-status Critical Current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
    • H01P1/165—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

Definitions

  • the present invention relates to a dual polarization microwave receiver for direct recep­tion from broadcasting satellite.
  • said household receivers (a) be able to receive sim­ultaneously the largest possible number of chan­nels and hence have double polarization; (b) have high electrical characteristics, i.e. a merit factor better than 6dB/°K and high attenuation at the local oscillator frequency and image band frequencies; (c) be as compact as possible in such a manner as to have the smallest dimensions possible; and d) be producible in large quantities at low cost.
  • Present microwave receivers for the aforesaid use comprise a plurality of distinct microwave components interconnected mechanically.
  • Said components consists of a feed associated with the receiving antenna reflector, a polarizer which converts the circular polarization received into linear polarization, a decoupler of the orthogonal modes which allows simultaneous extraction of the two receivable crossed polarizations and, for each polarization, a band-pass filter and an RF-IF (radio frequency - intermediate frequency) con­verter.
  • the object of the present invention is to accomplish a dual polarization microwave receiver for direct reception from broadcasting satellite which would be less cumbersome and costly, and simpler fabrication, assembly and adjustment com­pared with presently known receivers.
  • a receiver characterized in that it comprises a feed, a polarizer and a decoupler of the orthogonal modes built in a single waveguide structure with an internal section increasing toward the ends, the smallest and greatest di­mensions of the cross sections being such that they describe a middle cutoff frequency greater than the local oscillator frequency and the image band frequencies and smaller than the signal radiofrequencies.
  • the microwave receiver illustrated in FIGS. 1 and 2 comprises a monobloc wave-guide structure with a symmetrical section (round or square) 1 with which are associated two RF-IF converters 2 and 3 arranged perpendicularlly to each other.
  • the wave-guide structure 1 is accentuated in FIGS. 3-5 where it is seen made up of a main part 4 developing from the left or output end 5 (viewing FIGS. 3 and 5) to the end with the smaller section 6 of a funnel-shaped part 7 which leads to the right or input end 8.
  • Said main part 4 has an internal section increasing from a minimum value at the transversal plane 9 (FIG. 3) to slightly larger values at the two ends 5 and 6.
  • the smallest and largest dimensions of the cross sections are selected in such a manner as to describe a middle cutoff frequency greater than the local oscillation frequency of the converters 2 and 3 and of the image band frequencies but smaller than the signal radio frequencies so as to appropriately attenuate the former but not the latter.
  • the funnel-shaped part 7 fulfills the feed function and is designed for connection to an ordinary antenna reflector, e.g. of the parabolic type.
  • the main part 4 fulfills the dual function of polarizer and decoupler of the orthogonal modes.
  • the first function it uses an internal projection 10 (optionally replaceable by a di­electric) which by varying the internal section of the wave-guide allows conversion of the circular polarization arriving from the satellite to the linear one usable by the receivers 2 and 3.
  • the second function it also uses a short-circuit plane 11 which closes the ouput end 5 of the wave-guide and another short-circuit lamination 12 placed in the intermediate section between the sections 5 and 6 at a 90° angle to the plane 11.
  • main part 4 of the wave-guide structure also fulfills the filtering function necessary for separation of the signal radio frequencies from the other frequencies involved in the system.
  • Upstream and downstream from the short-circuit lamination 12 in the direction of transmission of the signal received are arranged at a 90° angle from each other two capacitive probes 13 and 14 which take the respective orthogonal modes of the signal received and previously converted into linear polarization and transmit them to the respective RF-IF converters 2 and 3 (FIG. 2).
  • Said RF-IF converters 2 and 3 comprise respec­tive containers 15 and 16 which describe housing recesses 17 and 18 for the related electrical circuits.
  • the probes 13 and 14 connect the internal cavity of the wave-guide structure 1 to said circuits, which perform the usual conversion from radio frequency to intermediate frequency.
  • the two converters 2 and 3 are arranged at a 90° angle from each other and are connected operationally to the wave-guide structure 1 with capacitive coup­ling.
  • a capacitive coupling with converters arranged in parallel as shown in FIG. 6 and an inductive coupling with converters arranged in parallel as shown in FIG. 7 can however be provided.
  • the coupling calls for the interposition of short secondary wave-guides 19 and 20 coupled to the main wave-guide 1 by means of irises which are not shown.
  • FIGS. 6 and 7 are particularly beneficial as regards overall encumbrance of the system.

Landscapes

  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
EP87200231A 1986-03-03 1987-02-13 Mikrowellenempfänger zweier Polarisationen zum direkten Empfang von Signalen eines Übertragungssatelliten Withdrawn EP0235846A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT19608/86A IT1188403B (it) 1986-03-03 1986-03-03 Ricevitore a microonde a doppia polarizzazione per ricezione di radiodiffuzione diretta da satellite
IT1960886 1986-03-03

Publications (2)

Publication Number Publication Date
EP0235846A2 true EP0235846A2 (de) 1987-09-09
EP0235846A3 EP0235846A3 (de) 1988-09-14

Family

ID=11159502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200231A Withdrawn EP0235846A3 (de) 1986-03-03 1987-02-13 Mikrowellenempfänger zweier Polarisationen zum direkten Empfang von Signalen eines Übertragungssatelliten

Country Status (2)

Country Link
EP (1) EP0235846A3 (de)
IT (1) IT1188403B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2235340A (en) * 1989-08-22 1991-02-27 Funai Electric Engineering Com Signal receiver for satellite broadcast
FR2664748A1 (fr) * 1990-07-16 1992-01-17 Tonna Electronique Ensemble cornet-tete hyperfrequence.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2329555A1 (de) * 1973-06-09 1974-12-19 Philips Patentverwaltung Hochpassfilter fuer den ghz-bereich
EP0059927A1 (de) * 1981-03-07 1982-09-15 ANT Nachrichtentechnik GmbH Mikrowellen-Empfangseinrichtung
EP0060762A1 (de) * 1981-03-18 1982-09-22 Portenseigne Empfangssystem für orthogonal polarisierte HF-Signale
GB2117980A (en) * 1982-03-25 1983-10-19 Italiana Esercizio Telefon Dual polarisation signal waveguide device
EP0122391A1 (de) * 1983-02-17 1984-10-24 Siemens Aktiengesellschaft Breitbandiger Mikrowellenstrahler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2329555A1 (de) * 1973-06-09 1974-12-19 Philips Patentverwaltung Hochpassfilter fuer den ghz-bereich
EP0059927A1 (de) * 1981-03-07 1982-09-15 ANT Nachrichtentechnik GmbH Mikrowellen-Empfangseinrichtung
EP0060762A1 (de) * 1981-03-18 1982-09-22 Portenseigne Empfangssystem für orthogonal polarisierte HF-Signale
GB2117980A (en) * 1982-03-25 1983-10-19 Italiana Esercizio Telefon Dual polarisation signal waveguide device
EP0122391A1 (de) * 1983-02-17 1984-10-24 Siemens Aktiengesellschaft Breitbandiger Mikrowellenstrahler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2664748A1 (fr) * 1990-07-16 1992-01-17 Tonna Electronique Ensemble cornet-tete hyperfrequence.

Also Published As

Publication number Publication date
EP0235846A3 (de) 1988-09-14
IT8619608A0 (it) 1986-03-03
IT8619608A1 (it) 1987-09-03
IT1188403B (it) 1988-01-14

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