EP0374722A1 - Richtfunkantenne mit adaptiv gesteuertem Subreflektor - Google Patents

Richtfunkantenne mit adaptiv gesteuertem Subreflektor Download PDF

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Publication number
EP0374722A1
EP0374722A1 EP89123081A EP89123081A EP0374722A1 EP 0374722 A1 EP0374722 A1 EP 0374722A1 EP 89123081 A EP89123081 A EP 89123081A EP 89123081 A EP89123081 A EP 89123081A EP 0374722 A1 EP0374722 A1 EP 0374722A1
Authority
EP
European Patent Office
Prior art keywords
subreflector
reflector
antenna according
sub
rotation
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Withdrawn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
EP89123081A
Other languages
German (de)
English (en)
French (fr)
Inventor
Karl-Peter Dr.-Ing. Dombek
Volker Dr.-Ing. Hombach
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.)
Kabelmetal Electro GmbH
Original Assignee
Kabelmetal Electro GmbH
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 Kabelmetal Electro GmbH filed Critical Kabelmetal Electro GmbH
Publication of EP0374722A1 publication Critical patent/EP0374722A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/16—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device
    • H01Q3/20—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device wherein the primary active element is fixed and the reflecting device is movable

Definitions

  • the invention relates to a double reflector antenna which can be used in particular in digital radio relay to compensate for interference caused by multipath propagation.
  • K.-P. Dombek on "Reduction of multipath interference by adaptive beam orientation” European Conference on Radio-Relay-Systems, Conf. Publ. ECRR, VDE-Verlag, 1986, p.400-406
  • small angular deflections of the main lobe of the transmitting and / or receiving antenna can effectively reduce interference due to multipath propagation, such as occurs on radio links in unfavorable weather conditions.
  • the necessary swivel range of the main lobe is less than two half-widths.
  • the invention has for its object to reduce interference due to multipath propagation and to keep the amount of equipment as small as possible.
  • Fig. 1 explains the operation of the invention in more detail.
  • the asymmetrical double reflector antenna bundles the received electromagnetic wave at the paraboloidal main reflector 1, deflects it at the subreflector 2 and thus leads it to the horn exciter 3.
  • the signal picked up by horn exciter 3 reaches receiver 4. Fading, which occurs on the transmission link due to multipath propagation, is particularly noticeable by frequency-selective changes in the group delay and the attenuation of the received signal. Depending on the width of the transmitted frequency band, the receiver must therefore detect these changes at several points and feed them to the fault evaluation circuit 5.
  • the evaluation circuit 5 emits a control pulse for the electric motor 6, which can be implemented in particular as a stepper motor. So that the rotatably mounted sub-reflector 2 is tilted by a small angle.
  • the horizontal axis of rotation 7 of the sub-reflector preferably passes through the center of the aperture, but can also be attached at other points of the sub-reflector if it is necessary for reasons of space.
  • the tilting of the sub-reflector causes the main lobe of the antenna to deflect in the elevation plane. If the reception quality deteriorates further as a result, the evaluation circuit 5 causes a sub-reflector rotation in the opposite direction.
  • the evaluation circuit thus works in a control loop which strives to set the best possible reception quality by changing the angular position of the sub-reflector and the associated deflection of the main lobe.
  • the subreflector Since the subreflector has a relatively small mass, it can be moved relatively quickly. In conventional 3-m directional radio antennas, a maximum stroke of the lower or upper edge of the sub-reflector of 2 to 4 cm is possible with a beam deflection 8 of a half-value width. Since the propagation conditions to be compensated only change relatively slowly in the event of a fault (periods of around one second can still be regarded as stationary), the speed of the control loop is sufficient, even though it contains mechanically moved elements. In the large asymmetrical double reflector antennas used in directional radio, the subreflector is usually located under a protective cover, so that no special measures for weather protection of the pivot bearings, joints and the motor are necessary.
  • the received signal passes through the down mixer 10 to the intermediate frequency amplifier 11.
  • the frequency-dependent transmission characteristic of the propagation path is determined by at least three narrowband bandpass filters 12 and detectors 13.
  • the multiplexer 14 switches the amplitude values one after the other via the analog-digital converter 15 to the input of the microcomputer 16. If the set threshold value of the dispersion is exceeded, the microcomputer 16 gives the necessary pulses to the motor control circuit 17 for actuating the stepping motor 6 then turns the subreflector.
  • the sensitivity of the control loop can be increased by superimposing a slight modulation in the form of a uniform vibration of the sub-reflector.
  • this measure has a very broadband effect to reduce interference due to multipath propagation.
  • An advantage of the invention over other measures to compensate for loss is also to be seen in the fact that existing double reflector antennas can usually be retrofitted very easily without the excitation system having to be replaced. Neither a second antenna nor additional exciters or receivers are required. If the main lobe is deflected by less than two half-widths, no significant deterioration in the sub-Zipple level 9 and the cross-polarization diagram compared to the original disturbed signal can be observed.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
EP89123081A 1988-12-22 1989-12-14 Richtfunkantenne mit adaptiv gesteuertem Subreflektor Withdrawn EP0374722A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843144 1988-12-22
DE19883843144 DE3843144A1 (de) 1988-12-22 1988-12-22 Richtfunkantenne mit adaptiv gesteuertem subreflektor

Publications (1)

Publication Number Publication Date
EP0374722A1 true EP0374722A1 (de) 1990-06-27

Family

ID=6369783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123081A Withdrawn EP0374722A1 (de) 1988-12-22 1989-12-14 Richtfunkantenne mit adaptiv gesteuertem Subreflektor

Country Status (4)

Country Link
EP (1) EP0374722A1 (no)
DE (1) DE3843144A1 (no)
FI (1) FI896177A0 (no)
NO (1) NO895157L (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2553302A (en) * 2016-08-30 2018-03-07 Avanti Communications Group Plc Satellite equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19805625A1 (de) * 1998-02-12 1999-08-19 Sucker Erfassung elektromagnetischer Strahlungsquellen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE705372C (de) * 1934-07-06 1941-04-25 Telefunken Gmbh Maximumpeiler
US2531454A (en) * 1942-02-04 1950-11-28 Sperry Corp Directive antenna structure
US3882503A (en) * 1960-08-17 1975-05-06 Gte Sylvania Inc Wave detection apparatus
DE2555872A1 (de) * 1974-12-12 1976-06-16 Westinghouse Electric Corp Antennensteuer- und regeleinrichtung
GB2088173A (en) * 1980-11-25 1982-06-03 Rca Corp Apparatus for automatically steering an electrically steerable television antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE705372C (de) * 1934-07-06 1941-04-25 Telefunken Gmbh Maximumpeiler
US2531454A (en) * 1942-02-04 1950-11-28 Sperry Corp Directive antenna structure
US3882503A (en) * 1960-08-17 1975-05-06 Gte Sylvania Inc Wave detection apparatus
DE2555872A1 (de) * 1974-12-12 1976-06-16 Westinghouse Electric Corp Antennensteuer- und regeleinrichtung
GB2088173A (en) * 1980-11-25 1982-06-03 Rca Corp Apparatus for automatically steering an electrically steerable television antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2553302A (en) * 2016-08-30 2018-03-07 Avanti Communications Group Plc Satellite equipment

Also Published As

Publication number Publication date
NO895157D0 (no) 1989-12-20
DE3843144A1 (de) 1990-06-28
NO895157L (no) 1990-06-25
FI896177A0 (fi) 1989-12-21

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