EP1214752A1 - Antenne servant a la reception de signaux de satellites et de signaux terrestres, et dispositif de modification d'antenne - Google Patents

Antenne servant a la reception de signaux de satellites et de signaux terrestres, et dispositif de modification d'antenne

Info

Publication number
EP1214752A1
EP1214752A1 EP00926895A EP00926895A EP1214752A1 EP 1214752 A1 EP1214752 A1 EP 1214752A1 EP 00926895 A EP00926895 A EP 00926895A EP 00926895 A EP00926895 A EP 00926895A EP 1214752 A1 EP1214752 A1 EP 1214752A1
Authority
EP
European Patent Office
Prior art keywords
antenna
monopole
dipole
signals
modification device
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.)
Granted
Application number
EP00926895A
Other languages
German (de)
English (en)
Other versions
EP1214752B1 (fr
Inventor
Ulrich Bettin
Heinz GERHÄUSER
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP1214752A1 publication Critical patent/EP1214752A1/fr
Application granted granted Critical
Publication of EP1214752B1 publication Critical patent/EP1214752B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • 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
    • 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
    • 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
    • H01Q9/38—Vertical arrangement of element with counterpoise

Definitions

  • Antenna for receiving satellite signals and terrestrial signals and antenna modification device for receiving satellite signals and terrestrial signals and antenna modification device
  • the present invention relates to an antenna and in particular to a universal antenna for the reception of satellite signals and terrestrial signals, which is particularly suitable for mobile use.
  • the present invention further relates to an antenna modification device for modifying an existing monopole antenna.
  • the elevation angle of a receiving antenna to geostationary satellites is between 30 ° and 60 ° depending on the latitude at which the receiving antenna is located.
  • the maximum gain of the receiving antenna should therefore be 45 °.
  • Common vertical antennas for mobile reception which are referred to as so-called rod antennas, such as the Classic ⁇ / 4 monopoly, due to the system, have a theoretical zero at an elevation angle of 90 ° or an angle theta of 0 °. Due to the influence of finite electrical conductivity and losses in the metallic base, for example the car roof, the maximum gain of these antennas is at an elevation angle between 10 ° and 35 °. Above an elevation angle of 35 °, the antenna gain decreases rapidly, which severely reduces the system reserve in the case of satellite reception. However, this can lead to loss of reception. Conventional automobile antennas are therefore not suitable for the joint reception of terrestrial signals and satellite signals.
  • the object of the present invention is to provide an antenna for the reception of satellite signals and terrestrial signals, in which reception losses in satellite reception can be avoided.
  • Another object of the present invention is to provide an antenna modification device for modifying existing monopole antennas, which enables existing monopole antennas to be modified in such a way that reception losses in satellite reception can be eliminated or reduced.
  • the present invention provides an antenna for receiving satellite and terrestrial signals, which has a monopoly having a first end connected to a feed point and a second end.
  • the antenna also has an unpowered dipole which is spaced axially from the second end of the monopole. direction to the monopoly is arranged.
  • the monopoly is a ⁇ / 4 monopoly, while the dipole has a length in the range of ⁇ / 2-25% and ⁇ / 2 + 25%. Furthermore, the distance between monopole and dipole is preferably less than ⁇ / 10. Due to the arrangement according to the invention of monopole and unpowered dipole, the dipole as a purely passive element contributes to the resulting directional characteristic via field coupling, i.e. to the far field pattern, the antenna. The resulting directional characteristic shows a maximum gain that is in the range of an elevation angle of 45 °. Thus, the antenna according to the invention is particularly suitable for receiving signals which are transmitted via geostationary satellites, so that reception losses can be eliminated or reduced.
  • the present invention further provides an antenna modification device for modifying a monopole antenna having a first end connected to a feed point and a second end, the antenna modification device having a dipole and a connector.
  • the connecting element serves to connect the dipole and the monopole in such a way that the dipole is spaced apart from the second end of the monopole and is in axial alignment with the monopole.
  • FIG. 1 shows a schematic illustration of an exemplary embodiment of an antenna according to the invention for the reception of satellite signals and terrestrial signals; and Fig. 2 shows a directional characteristic of the antenna shown in Fig. 1.
  • the antenna is preferably attached to a conductive base, for example a car roof 10.
  • a monopoly 12 which is preferably a ⁇ / 4 monopoly, is connected to a feed point 14 at its base point at which it is attached to the car roof 10.
  • the feed point 14 is, for example, a coaxial connection.
  • a dipole 16 is now arranged at a distance from the second end of the monopole 12 in axial alignment with the monopole 12, a distance 18 being provided between the monopole 12 and the dipole 16.
  • the length of the dipole is preferably between ⁇ / 2 minus 25% and is the wavelength associated with the frequency of the signals to be received. In the most preferred case, the length of the dipole 16 is.
  • the distance 18 between the monopole 12 and the dipole 16 is preferably less than ⁇ / 10 -
  • the dipole 16 is not supplied by itself, but rather contributes as a purely passive element, which does not have its own connection, via field coupling to the resulting directional characteristic, which is shown in FIG.
  • the antenna arrangement according to the invention has the result that the gain maximum 20 lies in a range of an elevation angle of 45 °, as indicated by arrow 22 in FIG. 2. It can also be seen from FIG. 2 that the maximum gain in the region of an elevation angle of 45 ° is approximately 6 dBi, ie 6 dB compared to an isotropic radiator. This guarantees optimal reception of satellite signals. As can also be seen in FIG. 2, the gain of the antenna decreases in the direction of the base area, which is acceptable, however, due to the already high reception field strengths of the terrestrial transmission signals which hit the reception antenna at an elevation angle between 0 ° and 20 °.
  • the absolute gain as well as the location of the maximum profit with respect to the base area, ie the elevation angle thereof, can be influenced or optimized.
  • the monopole 12 can be realized, for example, with a length of 3.2 cm and the dipole 16 with a length of 6.4 cm.
  • the antenna is realized in that the monopole 12 and the dipole 16 are clad in a plastic sheath, as is customary, for example, for conventional monopole automotive antennas.
  • the spacing between monopole 12 and dipole 16 can also be ensured by plastic, for example.
  • An antenna modification device is constructed in order to produce an antenna according to the invention for the reception of satellite signals and terrestrial signals from a conventional monopole antenna.
  • the antenna modification device according to the invention has a dipole, which corresponds, for example, to the dipole 16 shown in FIG. 1.
  • the antenna modification device has a connector (not shown) to connect the dipole and the conventional monopole so as to have the relationship with each other described above with reference to FIG. 1.
  • at the connecting element can be, for example, a plug-in sleeve or another device which is suitable for fastening an element containing the dipole to the second end of a conventional monopole, which is usually clad with plastic.
  • Conventional monopole antennas can thus be upgraded in accordance with the invention in order to enable interference-free reception of satellite signals.
  • conventional monopole antennas do not have to be completely replaced by the antenna according to the invention, but can be upgraded by the antenna modification device according to the invention, which represents a considerable cost saving.

Abstract

La présente invention concerne une antenne servant à la réception de signaux de satellites et de signaux terrestres, comprenant un monopôle (12) présentant une première extrémité reliée à un point d'alimentation (14) et une seconde extrémité, et un dipôle non alimenté (16) qui est situé à distance de la seconde extrémité du monopôle (12) en direction axiale par rapport à celui-ci. Ce dispositif permet d'obtenir un gain maximum de l'antenne pour un angle d'élévation d'environ 45 DEG . Un dispositif de modification d'antenne comprend un dipôle et un élément de liaison grâce auquel le dipôle peut être relié à l'extrémité d'une antenne à monopôle préexistante de sorte que le dipôle se trouve non alimenté à distance de la seconde extrémité du monopôle en direction axiale par rapport à celui-ci.
EP00926895A 1999-09-16 2000-04-12 Antenne servant a la reception de signaux de satellites et de signaux terrestres, et dispositif de modification d'antenne Expired - Lifetime EP1214752B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19944505 1999-09-16
DE19944505A DE19944505C2 (de) 1999-09-16 1999-09-16 Antenne für den Empfang von Satellitensignalen und terrestrischen Signalen und Antennenmodifikationsvorrichtung
PCT/EP2000/003293 WO2001020721A1 (fr) 1999-09-16 2000-04-12 Antenne servant a la reception de signaux de satellites et de signaux terrestres, et dispositif de modification d'antenne

Publications (2)

Publication Number Publication Date
EP1214752A1 true EP1214752A1 (fr) 2002-06-19
EP1214752B1 EP1214752B1 (fr) 2003-05-28

Family

ID=7922303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00926895A Expired - Lifetime EP1214752B1 (fr) 1999-09-16 2000-04-12 Antenne servant a la reception de signaux de satellites et de signaux terrestres, et dispositif de modification d'antenne

Country Status (5)

Country Link
US (1) US6633263B2 (fr)
EP (1) EP1214752B1 (fr)
DE (2) DE19944505C2 (fr)
HK (1) HK1046332B (fr)
WO (1) WO2001020721A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7420521B2 (en) * 2007-01-08 2008-09-02 Applied Radar Inc. Wideband segmented dipole antenna
US20080169988A1 (en) * 2007-01-16 2008-07-17 Deaett Michael A Lightweight, conformal, wideband airframe antenna
DE102009015699A1 (de) 2008-10-30 2010-05-06 Rohde & Schwarz Gmbh & Co. Kg Breitband-Antenne

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479130A (en) * 1981-06-05 1984-10-23 Snyder Richard D Broadband antennae employing coaxial transmission line sections
GB2148604B (en) * 1983-10-18 1988-01-06 Plessey Co Plc Monopole aerial
DE3826777A1 (de) * 1988-08-06 1990-02-08 Kathrein Werke Kg Axiale zweibereichsantenne
US5173713A (en) * 1991-01-14 1992-12-22 Laboratorie D'etudes Et De Researches Chimiques (Lerc) S.A. Three element inverted conical monopole with series inductance and resistance in each element
US5307078A (en) * 1992-03-26 1994-04-26 Harada Kogyo Kabushiki Kaisha AM-FM-cellular mobile telephone tri-band antenna with double sleeves
US5798736A (en) * 1995-03-28 1998-08-25 Mcdonnell Douglas Corporation Antenna system having a plurality of fundamental resonances
GB2306252B (en) * 1995-10-10 2000-05-10 Edward Charles Forster Self-terminated travelling wave antenna
FR2758012B1 (fr) * 1996-12-27 1999-05-28 Thomson Csf Antenne double, en particulier pour vehicule
JPH11308038A (ja) 1998-04-20 1999-11-05 Yokowo Co Ltd アンテナおよびアンテナ装置
US6337667B1 (en) * 2000-11-09 2002-01-08 Rangestar Wireless, Inc. Multiband, single feed antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0120721A1 *

Also Published As

Publication number Publication date
HK1046332B (zh) 2003-10-17
DE19944505C2 (de) 2001-10-18
HK1046332A1 (en) 2003-01-03
US6633263B2 (en) 2003-10-14
DE19944505A1 (de) 2001-04-19
EP1214752B1 (fr) 2003-05-28
DE50002387D1 (de) 2003-07-03
US20020089460A1 (en) 2002-07-11
WO2001020721A1 (fr) 2001-03-22

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