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
• • 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
  • H01Q19/13—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 being a single radiating element, e.g. a dipole, a slot, a waveguide termination
• • 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

Definitions

• the invention relates to an arrangement for exciting a centrally focused reflector antenna.
• the application of the arrangement extends primarily to the areas of communication technology for stationary, portable and mobile transceiver systems of high-frequency electromagnetic radiation sources, in particular of geostationary and rotating satellite systems, for land and air mobile sources as well as for point-to-point microwave transmission or the point-to-multipoint directional radio transmission of the safety, radar and contactless sensor technology.
• Reflector antenna systems use either a grooved horn or a flared waveguide piece as the excitation system at the waveguide end.
• the excitation system is in focus, the phase center, the
• Reflector antenna arranged and should illuminate this optimally. Of particular importance is the largely uniform illumination of the
• Focussed excitation system which consists of discrete Single radiators (ARRAY) or a combination of such an array, which is excited by another system.
• the required sealing of the waveguide system against environmental influences can only be achieved by additional and complex components, which under certain circumstances can also impair the functionality of the excitation system.
• the known excitation systems cannot be retroactively combined with subsequent modules, for example down-converters. This means that additional expenses are generally required for optimally adapting such a known excitation system to the subsequent assembly, with the associated costs.
• the object of the invention is therefore to provide a cost-effective arrangement for field-optimal and broadband excitation of centrally focused reflector antennas in their focal point, the phase center, with simultaneous reaction-free connection with subsequent assemblies and improved environmental sealing of the waveguide, and adaptation of the excitation system to the respective reflector geometry (F / D ratio ) and to influence the design of the radiation diagram with the functionality of changing the field distribution at the end of the waveguide specifically to the reflector system of the shape so that there is no reaction in the waveguide and thus on the subsequent assembly.
• the arrangement according to the invention has the particular advantage that a field-optimal and broadband excitation of centrally focused reflector antennas is guaranteed in their focal point. Due to the dielectric field transformer, no mechanically moving components are required.
• the arrangement as a whole can be manufactured inexpensively with a high level of mechanical precision and with little effort and, moreover, also has a high tolerance to different environmental conditions, such as temperature, air humidity and aggressive media.
• a loss and field-optimal change of the broadband field of the field transformer is possible without mechanical moving components are required and without the dielectric carrier having to be mechanically connected to the field transformer.
• FIG. 1 shows the top view of the arrangement according to FIG. 1,
• Fig. 3 shows the section through an arrangement according to the invention with a
• Bracket for mounting a circular reflector 4 shows the rear view of the arrangement according to the invention according to FIG. 3,
• Fig. 5 shows the section through an arrangement according to the invention with a mounted reflector.
• Fig. 6 top view of the dielectric carrier
• the arrangement according to the invention consists of a butt-terminating waveguide 1, which is terminated on one side with a dielectric field transformer 2, which partially projects into the waveguide 2 and whose geometry corresponds to or is adapted to the reflector system used ,
• the waveguide 1 has at its other end a mounting platform 3 for subsequent assemblies 8.
• the dielectric field transformer 2 influences the E components of the alternating electromagnetic field in the direction of propagation in such a way that the original wave field at the other end of the waveguide 1 is deformed such that a uniform, in particular circular expansion of the resulting radiation field of the waveguide 1 and a selectable power distribution on the reflector can be achieved. This causes a drastic increase in the efficiency of the entire arrangement.
• a preferred embodiment of the arrangement according to the invention provides that the subsequent assembly 8 is not mechanically rigidly connected to the waveguide 1 and the mounting platform 3, but rather can be rotatably and mechanically fixed in order to arrange the axis of symmetry of the reflector 6.
• This is associated with the particular advantage that, while maintaining all the functionalities of the system without changing the position of the entire antenna arrangement, in particular the reflector 6, any polarization rotations with respect to the orthogonal arrangement of the H / E vector to the normal plane of the earth - in particular the one so-called skew angle - can be compensated by rotating the following assembly 8.
• the dielectric field transformer 2 also has the advantage that for a wide bandwidth, the field influence is almost uniform and at the same time a transformation of the waveguide wave mode into the free space mode is realized, as a result of which the arrangement of the dielectric field transformer 2 / waveguide 1 has no effects a follow-up system can be connected.
• FIG. 3 shows an arrangement according to the invention with the holder 4 shown here folded in for the accommodation of a reflector, the dielectric field transformer 2 and the mounting platform 3 provided for subsequent modules.
• FIG. 4 shows the rear view of this arrangement in which the mounting platform 3 is designed as an equilateral triangular surface 5 in order to minimize shadowing in the mirror.
• FIG. 5 shows the arrangement according to the invention with the reflector mounted.
• the subreflector with a circular aperture 6 is mounted on the brackets 4 by means of the supports 7.
• the subsequent assemblies 8 are fastened to the assembly platform 3 by means of a screw connection.
• the arrangement according to the invention is positioned in the axis of rotation of the reflector 6 and with the dielectric field transformer 2 at the level of the focal point of the reflector 6.
• a support plate 9 is arranged in the vicinity of the dielectric field transformer 2 by means of screwed-on spacers 11.
• the dielectric carrier board 9 has a bore 12 at the location of the field transformer 2 with a diameter suitable for the dielectric field transformer 2 and is arranged plane-parallel to the mounting platform 3 without a direct mechanical or electrical connection to the dielectric field transformer 2.
• the dielectric carrier board 9, on which the passive radiator components and switching elements 10 are arranged, has the effect that the source field originating from the dielectric field transformer 2 is influenced only slightly by the openings in the dielectric carrier board 9, which has the consequence that the penetrating Field and thus the entire antenna arrangement are only slightly attenuated and thus extremely high efficiency is still available. At the same time, it is possible to influence the source field originating from the dielectric field transformer 2 in such a way that the resulting radiation characteristic of the antenna can be varied within the limits desired for the application. Another advantage of this embodiment of the arrangement is that simple mechanical arrangement options for different
• Antenna arrangements allow both the optimal illumination and thus the high efficiency of the entire antenna arrangement to be achieved while at the same time influencing the radiation characteristic, which in particular leads to a significant reduction in the necessary reflector surface 6 compared to conventional beam swiveling systems.
• FIG. 6 shows the dielectric carrier 9 in a top view. This is fastened to the mounting platform 3 with the screwable spacers 11.
• the dielectric carrier 9 contains in its center a circular bore 12, the diameter of which corresponds to the dielectric field transformer 2.
• Parasitic (passive) radiators with switching components 10 are arranged around the bore 12 of the dielectric carrier 9. In FIG. 6, these are arranged, for example, in a uniform distribution at an angle of 90 ° each, the elements each consisting of a pair of radiators which are positioned orthogonally to one another.
• a control block 13 consisting of standard components, is arranged on the dielectric carrier 9 and takes over the control of the switching components. The control block is connected with a cable 14 to further subsequent assemblies.

Landscapes

• Aerials With Secondary Devices (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)
• Waveguide Aerials (AREA)
• Details Of Aerials (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Priority Applications (13)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7956297

Family Applications (1)

Country Status (15)

Cited By (1)

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Citations (8)

Family Cites Families (14)

• 2001
  • 2001-04-21 DE DE20107294U patent/DE20107294U1/de not_active Expired - Lifetime
• 2002
  • 2002-04-19 PT PT02735053T patent/PT1384287E/pt unknown
  • 2002-04-19 KR KR1020037013703A patent/KR100896113B1/ko not_active Expired - Fee Related
  • 2002-04-19 EP EP02735053A patent/EP1384287B1/de not_active Expired - Lifetime
  • 2002-04-19 IL IL15849202A patent/IL158492A0/xx unknown
  • 2002-04-19 DE DE10291770T patent/DE10291770D2/de not_active Expired - Fee Related
  • 2002-04-19 DE DE50200764T patent/DE50200764D1/de not_active Expired - Lifetime
  • 2002-04-19 DK DK02735053T patent/DK1384287T3/da active
  • 2002-04-19 WO PCT/DE2002/001511 patent/WO2002087018A1/de not_active Ceased
  • 2002-04-19 JP JP2002584429A patent/JP2004527178A/ja active Pending
  • 2002-04-19 HR HR20030859A patent/HRP20030859B1/xx not_active IP Right Cessation
  • 2002-04-19 US US10/475,543 patent/US6876335B2/en not_active Expired - Fee Related
  • 2002-04-19 CA CA2444948A patent/CA2444948C/en not_active Expired - Fee Related
  • 2002-04-19 CN CNB028086031A patent/CN100376059C/zh not_active Expired - Fee Related
  • 2002-04-19 ES ES02735053T patent/ES2225791T3/es not_active Expired - Lifetime
  • 2002-04-19 AT AT02735053T patent/ATE272902T1/de active
• 2003
  • 2003-10-20 IL IL158492A patent/IL158492A/en not_active IP Right Cessation
  • 2003-10-20 NO NO20034685A patent/NO326863B1/no not_active IP Right Cessation

Patent Citations (8)

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