EP0977307A1 - Antennenstruktur mit mehreren Antennen, insbesondere für Satelliten- und Bodeninstallationen - Google Patents

Antennenstruktur mit mehreren Antennen, insbesondere für Satelliten- und Bodeninstallationen Download PDF

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Publication number
EP0977307A1
EP0977307A1 EP99202064A EP99202064A EP0977307A1 EP 0977307 A1 EP0977307 A1 EP 0977307A1 EP 99202064 A EP99202064 A EP 99202064A EP 99202064 A EP99202064 A EP 99202064A EP 0977307 A1 EP0977307 A1 EP 0977307A1
Authority
EP
European Patent Office
Prior art keywords
radiating element
satellite
antenna structure
ground installations
installations
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Withdrawn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
EP99202064A
Other languages
English (en)
French (fr)
Inventor
Orfeo G. Pinton
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.)
Rac Srl
Original Assignee
Rac Srl
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 Rac Srl filed Critical Rac Srl
Publication of EP0977307A1 publication Critical patent/EP0977307A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the present invention relates to a multiple-antenna structure, in particular for satellite and ground installations.
  • Ground or ground-based installations in addition to a very extensive distribution network, are able to count upon a very large number of users and a transmission signal which is of high quality within the confines of the areas where there is radio coverage.
  • Satellite installations which are currently going through a period of extremely rapid growth, are able to achieve a coverage far greater than that of ground installations, to the detriment, however, of the signal quality.
  • the antennas for ground-based installations must have a radiation pattern which is omnidirectional on a horizontal plane, so as to receive the same signal level, irrespective of the direction of travel of the mobile station relative to the base station, whereas, on the vertical plane, the antenna must have maximum gain on the horizon and zero gain at the zenith.
  • Polarization of the antenna for ground-based installations must be vertical.
  • the frequency bands used in this type of application are typically VHF or UHF frequency bands, with variable antenna gain and bandwidths.
  • the antennas for satellite installations must have a semi-spherical radiation pattern, preferably without secondary lobes, and with a clear cut-off at an elevation of 10 degrees. In this way all the satellites above the horizon are visible, except for those with an elevation of less than 10 degrees.
  • the amplitude response must be constant over the entire coverage area so that the signal received by the satellites has the maximum signal-to-noise ratio.
  • the frequency band used is, at present, the so-called "L band", although projects which use the "S band” are being developed. The bandwidth depends on the particular type of installation.
  • the satellite antenna could be blacked out by it or, in the most serious of cases, the amplification stage could be damaged.
  • the object of the present invention is that of eliminating the drawbacks mentioned, by providing a multiple-antenna structure, in particular for satellite and ground installations, which can be used so as to work together with communication installations operating at different frequencies, in particular so as to be able to use simultaneously a satellite installation and a ground-based installation.
  • Another object of the invention is that of providing a multiple-antenna structure, in particular for satellite and ground installations, which can be easily installed also in small areas, without the radiating elements, which operate at different frequencies, influencing each other such that they are disturbed and/or damaged.
  • an equally significant object of the invention is that of providing a multiple-antenna structure, in particular for satellite and ground installations, which is simple, safe, reliable and relatively low-cost.
  • the antenna structure 11 comprises a first radiating element 12 in the VHF/UHF band and a second radiating element 13 in the L band, which have radiation planes perpendicular to one another.
  • the decoupling between these radiating elements 12, 13 is greater than 100 dB.
  • the first radiating element 12 consists, for example, of a disk-type antenna which has radiation patterns in the horizontal plane and vertical plane shown in Figures 2 and 3.
  • the radiating element 12 operates, for example, in a frequency band of 30-1000 MHz.
  • the disk-type radiating element is known per se and therefore will not be further described in more detail below.
  • the second radiating element 13 is of the patch type and has radiation patterns in the horizontal and vertical planes shown in Figures 4, 5.
  • the radiating element 13 must emit/receive with polarization dependent on the installation in question, but in any case uniformly in the hemisphere above the horizon. Therefore the radiation diagram must be semi-spherical with a maximum gain in the direction defined by the axis Z and very low on the horizon.
  • the radiating element 13 operates, for example, in a band of 1000-4000 MHz and also has linear polarization, or in a different embodiment, cross-polarization, or in a further embodiment, right-hand or left-hand circular polarization or, finally, elliptical polarization.
  • the two radiating elements 12, 13 are arranged with axes which nearly coincide and so as to be positioned each in a region where the field generated by the other one is substantially zero.
  • the first radiating element 12 is positioned underneath the horizon of the second radiating element 13 so that the said radiating element 13 is positioned above the radiating element 12 in a zone in which the field generated by the latter is substantially zero.
  • the radiating element 13 is provided, moreover, with an "LNA” amplifier with a gain of 20-40 dB and a signal-to-noise ratio of less than 3 dB.
  • connection between the radiating elements is preferably provided along zero-current separation surfaces; moreover, the antenna structure 11 has a single output or, alternatively, two outputs.
  • the antenna structure 11 has an external protection although, in a different embodiment, it may not have said protection.
  • a multiple-antenna structure in particular for satellite and ground installations according to the invention, may be used for operating in any separate bands with radiation planes which are mutually perpendicular.
  • a multiple-antenna structure in particular for satellite and ground installations according to the invention, is particularly advantageous owing to its extreme ease of installation and owing to its small dimensions which make installation and use thereof extremely simple and flexible.
  • a multiple-antenna structure in particular for satellite and ground installations thus conceived, may be subject to numerous modifications and variations, all of which fall within the invention; moreover all the details may be replaced by technically equivalent elements.
  • the materials used, as well as the dimensions, may be of any nature according to technical requirements.
EP99202064A 1998-07-30 1999-06-25 Antennenstruktur mit mehreren Antennen, insbesondere für Satelliten- und Bodeninstallationen Withdrawn EP0977307A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998MI001779A IT1301886B1 (it) 1998-07-30 1998-07-30 Struttura di antenna multipla, in particolare per impianti satellitarie terrestri.
ITMI981779 1998-07-30

Publications (1)

Publication Number Publication Date
EP0977307A1 true EP0977307A1 (de) 2000-02-02

Family

ID=11380566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99202064A Withdrawn EP0977307A1 (de) 1998-07-30 1999-06-25 Antennenstruktur mit mehreren Antennen, insbesondere für Satelliten- und Bodeninstallationen

Country Status (2)

Country Link
EP (1) EP0977307A1 (de)
IT (1) IT1301886B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080307A1 (en) * 2001-03-29 2002-10-10 Tyco Electronics Corporation Compact multi-band antenna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5181044A (en) * 1989-11-15 1993-01-19 Matsushita Electric Works, Ltd. Top loaded antenna
GB2272575A (en) * 1992-11-02 1994-05-18 Gec Ferranti Defence Syst Dual band antenna
EP0740361A1 (de) * 1995-04-20 1996-10-30 FUBA Automotive GmbH Flachantennen-Anordnung
WO1996035241A1 (en) * 1995-05-02 1996-11-07 Centrepoint Technology Limited Antenna unit
US5654717A (en) * 1995-08-03 1997-08-05 Trimble Navigation, Ltd. GPS/radio antenna combination

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5181044A (en) * 1989-11-15 1993-01-19 Matsushita Electric Works, Ltd. Top loaded antenna
GB2272575A (en) * 1992-11-02 1994-05-18 Gec Ferranti Defence Syst Dual band antenna
EP0740361A1 (de) * 1995-04-20 1996-10-30 FUBA Automotive GmbH Flachantennen-Anordnung
WO1996035241A1 (en) * 1995-05-02 1996-11-07 Centrepoint Technology Limited Antenna unit
US5654717A (en) * 1995-08-03 1997-08-05 Trimble Navigation, Ltd. GPS/radio antenna combination

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080307A1 (en) * 2001-03-29 2002-10-10 Tyco Electronics Corporation Compact multi-band antenna

Also Published As

Publication number Publication date
ITMI981779A0 (it) 1998-07-30
IT1301886B1 (it) 2000-07-07
ITMI981779A1 (it) 2000-01-30

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