Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
  • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
  • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
  • H01Q19/17—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source comprising two or more radiating elements

Definitions

• This invention concerns a multibeam antenna capable of receiving/transmitting same frequency signals from/to one or more coplanar directions simultaneously.
• the invention consists of one or more radiating elements and of a parabolic reflector with square aperture.
• Essential detail for the achievement of optimal performance is that one of the four vertices of the square, which circumscribes the reflector, must be placed close to the vertex of the paraboloid. A more detailed explanation will be provided later on herein.
• the Inventors intend to meet the need of obtaining an antenna capable of simultaneously receiving/transmitting signals at the same frequency, from/to several coplanar directions, while ensuring at the same time a sufficient degree of isolation between signals, in the case that these directions are aligned and in proximity one with the other.
• the antenna comprising a parabolic reflector has radiating elements located at different positions of focusses at opposite sides with respect to the center axis of the antenna, while in the present invention, the radiating elements, are aligned on a line parallel to the diagonal of the quadrangular parabolic reflector and are placed close to one of the four vertices of the reflector.
• This invention finds its application in the technical field of space and non-space antenna electronics. It may be conveniently applied especially in the field of space antennas, most of all for TV signals.
• the invention subject of this application for patent refers to an antenna studied for Direct Broadcasting System (DBS) type applications, namely a direct TV signal reception system via satellite.
• DBS Direct Broadcasting System
• Fig. 1 shows one of the aperture shapes, of reflector (1), which can be assigned to the antenna in question, in which (3) indicates the rim, (4) indicates one of the four vertices close to which passes the focal axis (5).
• the focal axis is visible in Fig. 2, while in Fig. 1 it coincides with point (2).
• the radiating elements (2) are aligned on a line parallel to the diagonal (6); said radiating elements (2) and the optimal operating directions (represented by the diagonals (6) of the reflector) are coplanar and can be placed on two orthogonal planes.
• the antenna subject of the invention submitted herein, has therefore been studied, as mentioned before, for DBS type applications and in particular it meets the requirements the parameters of which are illustratively indicated by, but not limited to, the following:
• the antenna receives the TV signal coming from continguous satellites on the stationary orbit.
• the angular distance, which today is expected for these satellites, is about 3.3°. The Inventors have taken this requisite into account in their invention.
• the electro-magnetic energy coming from each satellite is reflected by the reflector's surface and directed towards the corresponding radiating element (2).

Landscapes

• Aerials With Secondary Devices (AREA)
• Radar Systems Or Details Thereof (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Burglar Alarm Systems (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=11402316

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (4)

• 1994
  • 1994-03-03 IT ITRM940117A patent/IT1271871B/it active IP Right Grant
• 1995
  • 1995-03-01 ES ES95830068T patent/ES2128026T3/es not_active Expired - Lifetime
  • 1995-03-01 DE DE69506928T patent/DE69506928T2/de not_active Expired - Fee Related
  • 1995-03-01 EP EP95830068A patent/EP0670609B1/en not_active Expired - Lifetime

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