EP2406854B1 - Weitbandige vhf und uhf antenne für zwei signale - Google Patents

Weitbandige vhf und uhf antenne für zwei signale Download PDF

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Publication number
EP2406854B1
EP2406854B1 EP20100705349 EP10705349A EP2406854B1 EP 2406854 B1 EP2406854 B1 EP 2406854B1 EP 20100705349 EP20100705349 EP 20100705349 EP 10705349 A EP10705349 A EP 10705349A EP 2406854 B1 EP2406854 B1 EP 2406854B1
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EP
European Patent Office
Prior art keywords
antenna
band
coaxial cable
core
uhf
Prior art date
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Active
Application number
EP20100705349
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English (en)
French (fr)
Other versions
EP2406854A1 (de
Inventor
Frédéric Ngo Bui Hung
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.)
Thales SA
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Thales SA
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Priority to PL10705349T priority Critical patent/PL2406854T3/pl
Publication of EP2406854A1 publication Critical patent/EP2406854A1/de
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    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/35—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using two or more simultaneously fed points

Definitions

  • the object of the invention relates to dual-channel broadband antennas for applications where the congestion parameter is predominant. It aims in particular, antennas whose working frequencies are in the band VHF and UHF commonly called VHF and UHF abbreviation Anglo-Saxon "Very High Frequency” and "Ultra High Frequency”.
  • the values for these frequency bands are, for example, for the VHF band designated low band: 30-88 MHz, and for the UHF band designated high band: 225-520 MHz.
  • Two-channel antenna means an antenna made up of at least two radiating elements which are powered separately by means of two channels. These radiating elements can be activated simultaneously in some cases in the two frequency bands or alternately.
  • the patent EP 0 851 532 ( figure 1 ) discloses a double antenna according to the prior art, in particular for a vehicle, characterized in that it comprises a ground plane pierced with an orifice, with one side of the ground plane the space outside the vehicle and on the other side a protected area; a coaxial cable 2 passes through the orifice, with a first end in the space outside the vehicle and a second end in the protected space, the cable forming turns 22 between the orifice and its second end; a connection between the outer conductor of the cable and the ground plane at the second end; a dipole-type radiating element 1 connected to be powered at the first end of the cable; a transformer composed of a magnetic core 5, and the turns 22, the secondary includes the outer conductor turns, an impedance 6 equal to the characteristic impedance of the cable, two power cables 8a, 8b.
  • the core of the cable 8a is connected to the point P lying on the outer braid of the coaxial cable portion forming the turns 22 and intended to convey the RF signals of the VHF band or low band for the application.
  • the coaxial 8b has its core connected to that of the coaxial cable 2 through the duplexer 9 and carries the RF signals of the UHF band designated as the high band.
  • the supply of the low band is done by the braid of the coaxial cable 2.
  • the antennal elements consist of monopole and dipole.
  • the patent US 5,311,201 describes an antenna capable of operating in the AM / FM broadcast bands and also in the higher frequency band reserved for the mobile radio.
  • This antenna has two access ports for the vehicle intended for the reception of the AM / FM broadcast radio alone and the transmission-reception of the UHF (GSM) radio telephone band has the disadvantage of only providing reception on one of the channels.
  • GSM UHF
  • the patent WO 97/41628 describes a dual-band antenna composed of two concentric monopole antennas, the shortest being realized in the form of a skirt encircling the longest.
  • One of the objectives of the invention is to provide an antenna adapted to be used for dual-channel portable radiocommunication applications and to have a compact antennal structure, while having a high efficiency and sufficient channel isolation in a wide band of frequencies at least one octave, for simultaneous operation invariably on both channels in transmission and / or reception.
  • the so-called high frequency frequency band is, for example, the UHF band [225-520 MHz] and the so-called low frequency band is the VHF band [30-88 MHz].
  • the length L inf may be substantially equal to one quarter of the wavelength of the geometric mean frequency F MOY of the high band.
  • the antennal element adapted to operate in the low band consists of a monofilar element disposed in the extension of the core of the coaxial and the cons-skirt.
  • the coaxial cable passes through the reference ground plane M and is extended above the reference ground plane M by a height L UHF equal to one quarter of the wavelength of the geometric mean frequency F MOY of the high band [F sup1 , F sup2 ].
  • the supply of the Bande Basse is deported to achieve a better known diet under the abbreviation Anglo-Saxon "center-fed”.
  • the radiating elements constituting the antenna are, for example, elements of monopole type.
  • the coaxial cable being wound around a magnetic element to form a winding, it further comprises a low-pass element (38) adapted to connect the point of the braid of the coaxial cable constituting the end of said winding to ground M.
  • the core of the coaxial cable is, for example, connected to the monofilar strand through a broadband matching cell.
  • the signals of the Low Band are conveyed by the soul of the coaxial.
  • the antennal structure according to the invention is a compact structure intended in particular for portable type applications.
  • the overall size of the antennal structure is minimized while maintaining high efficiency and sufficient channel isolation.
  • the invention makes it possible in particular to use only radiating elements of the monopole type, for the high band and the low band, contrary to the patents EP 0 851 532 or US 5,311,201 which call for the high band to a dipole type structure.
  • the radiating elements are arranged in a manner similar to those of WO 97/41621 .
  • Another advantage of the invention is to avoid the unbalance effect generated by the position at the top of the antenna of the dipole element for the high band described in the aforementioned patents.
  • the idea of the present invention for forming a compact size antenna rests notably on the implementation of a radiating element of monopole type and on the fact of exciting it, over its entire length for the low band (VHF ) corresponding to the frequency interval [F inf1 , F inf2 ] and only over part of its length for the high band (UHF) corresponding to the frequency interval [F sup1 , F sup2 ], frequency bands in which the compact antenna is intended to work.
  • VHF low band
  • UHF high band
  • the description also concerns antennas that can operate simultaneously on the two UHF, VHF, UHF and VHF channels, and vice versa, or on both channels simultaneously. in transmission simultaneously.
  • the Figures 2A and 2B represent an antenna intended to operate in the VHF frequency band: 30-88 MHZ and the UHF frequency band: 225-520 MHz.
  • the Figure 2A is a simplified description of an example of an antenna structure according to the invention comprising a VHF radiating element 20, having a length L VHF , or L sup because of its position, substantially equal to the total length of the antenna, a UHF radiating element 21, arranged in the lower part of the antenna, having its own length L inf due to its position in the lower part of the antenna or L UHF , a power system 23 connected to a connector 24 adapted to supply both UHF and VHF channels independently.
  • the Figure 2B represents in detail, an example of an antenna having an antenna structure similar to the structure of the Figure 2A .
  • a radome 25, preferably made of flexible material, is arranged around the antenna elements 20 and 21 to protect them.
  • a coaxial cable 26 consisting of a core 28 surrounded by a braid 26a or sheath is wound around a magnetic core 27a to constitute the winding 27b of a transformer, the assembly is arranged in a miniaturized box referenced B.
  • the core 28 of the coaxial cable 26 is extended above the height L UHF by a monofilar element 29 of length L wire .
  • the choice of material and the length of the wire are determined, for example, by the operational requirements. It is thus possible to use for the example given a length ranging from 280mm to 750mm for L wire .
  • a plug P is formed on the winding 27b to form the input of the high band and the second output S of the core of the coaxial that of the low band.
  • the coaxial cable is grounded at point S.
  • a counter skirt 30 is added to the coaxial cable 26 and forms the radiating element 21 in the high band.
  • the portion supplied with VHF corresponds substantially to the entire height of the antenna, that is to say the element 29 plus the portion of the coaxial corresponding to the height L UHF of the antenna element 21 plus the counter skirt 30.
  • Such a radiating structure with the feed point offset relative to the reference ground plane is commonly called by the skilled person "monopole with handle”.
  • this counter-skirt 30 behaves like a charge inductance placed in series with the monofilar strand 29 to form a self-charged handle monopole, the assembly 29 and 30 forming the radiating element in the low band.
  • This skirt 30 may be completed by other devices known to those skilled in the art and not shown to facilitate understanding of the antenna according to the invention to increase the insulation.
  • adaptation cells 31, 32 broadband and known to those skilled in the art are interposed between the access points and the connectors of the antenna.
  • the length L sup or L VHF is for example in the range [500, 1000] mm.
  • the length L UHF corresponding to the coaxial cable protruding above the reference ground element M is for example equal to 220 mm.
  • the choice of lengths L VHF , L UHF is defined relative to the desired compactness of the antenna.
  • the choice of the lengths is made by first determining the UHF length L as a function of the desired frequencies for the operation of the antenna and the desired size, that is to say in relation to a total length antenna to respect L total .
  • the length L VHF for the antennal element for the low frequencies will be determined by the remainder of available space considering the two lengths L UHF and L total .
  • the coil 27b and the supply circuit are grounded at points 35 and 36.
  • the radome 25 is, for example, made of dielectric material transparent to electromagnetic waves. It keeps the radiating elements in a vertical position and makes them integral with the supply circuit. It also has some flexibility to not hurt the user in operational configuration.
  • the power supply circuit 23 is arranged in a miniaturized housing B making the antenna assembly compact enough to be associated with portable radio equipment of the walkie-talkie type.
  • the two antennal elements can operate both in transmission, simultaneously. It is also possible that one of the two elements operate in transmission, while the other operates in reception. Both can also work in reception.
  • the figure 3 represents an alternative embodiment of the invention. It consists in connecting the core 28 to the monofilar strand 29 through a broadband adaptation cell 37 whose different possible structures are known to those skilled in the art and which is not detailed here.
  • This adaptation cell has the particular function of improving the performance of the antenna.
  • Another variant is to ground the foot of the antenna for the signals of the low band. It consists in connecting at the end of the winding 27b, the point 39 of the braid of the coaxial cable 26 to the ground via a low-pass element 38 not detailed here. This variant improves the insulation between the two channels.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)

Claims (8)

  1. Kompakte Doppelkanalantenne, die in wenigstens zwei Frequenzbändern arbeitet, einem hohen Band [Fsup1, Fsup2] und einem tiefen Band [Finf1, Finf2], und die wenigstens die folgenden Elemente umfasst:
    • ein Koaxialkabel (26), das mit Referenzmasse (M) verbunden ist und das eine Ader (28) und eine Beflechtung (26a) umfasst und um ein Magnetelement (27a) zum Bilden einer Spule (27b) gewickelt ist,
    • ein Antennenelement (21) geeignet zum Arbeiten im Hochfrequenzband [Fsup1, Fsup2], mit einer Länge Linf, die dadurch gekennzeichnet ist, dass sie ferner wenigstens die folgenden Elemente umfasst:
    • eine Abschirmschürze (30), deren Länge im Wesentlichen Linf entspricht und die um das Antennenelement (21) herum angeordnet ist, wobei sich das so umgebene Antennenelement (21) zwischen der Referenzmasseebene (M) und einem Antennenelement (29) befindet, das zum Arbeiten im Niederfrequenzband [Finf1, Finf2] ausgelegt ist, wobei die Baugruppe (20) bestehend aus dem Antennenelement (29) und der Abschirmschürze (30) eine Länge Lsup hat, die über die Ader (28) des Koaxialkabels (26) gespeist wird, wobei die Baugruppe (20) zum Arbeiten im Niederfrequenzband [Finf1, Finf2] ausgelegt ist, wobei das Antennenelement (21) über die Außenseite der Beflechtung (26a) des Koaxialkabels (26) an einem Abzweigpunkt P gespeist wird,
    • zwei Breitbandadaptionszellen (31, 32),
    und dadurch, dass
    • die Signale des hohen UHF-Bandes durch die die Spule (27b) bildende Beflechtung des Koaxialkabels (26) durch die erste Adaptionszelle (31) und den Abzweigpunkt oder den Abgriff P übertragen wird,
    • die Speisung des tiefen VHF-Kanals über das Innere der Spule (27b) durch die Ader (28) des Koaxialkabels (26) durch die zweite Adaptionszelle (32) erfolgt.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass das als Hochfrequenzband bezeichnete Frequenzband das UHF-Band [225-520 MHz] ist und das als Niederfrequenzband bezeichnete Band das VHF-Band [30-88 MHz] ist.
  3. Antenne nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Länge Linf im Wesentlichen gleich einem Viertel der Wellenlänge der mittleren geometrischen Frequenz FMOY des hohen Bandes ist.
  4. Antenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Antennenelement (20), das zum Arbeiten im tiefen Band ausgelegt ist, von einem monofilen Element (29) gebildet wird, das in der Verlängerung der Ader (28) des Koaxialkabels (26) und der Abschirmschürze (30) angeordnet ist.
  5. Antenne nach Anspruch 1 oder 4, dadurch gekennzeichnet, dass das Koaxialkabel (26) durch die Referenzmasseebene M passiert und über die Referenzmasseebene M um eine Höhe LUHF verläuft, die gleich einem Viertel der Wellenlänge der mittleren geometrischen Frequenz FMOY des hohen Bandes [Fsup1, Fsup2] ist.
  6. Antenne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Strahlungselemente, die die Antenne bilden, Elemente des Monopoltyps sind.
  7. Antenne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie ferner ein Tiefpasselement (38) zum Verbinden des Punktes (39) der das Ende der Spule (27b) bildenden Beflechtung des Koaxialkabels mit der Masse M ausgelegt ist.
  8. Antenne nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass die Ader (28) des Koaxialkabels (26) mit dem monofilen Strang (29) durch eine Breitbandadaptionszelle (37) verbunden ist.
EP20100705349 2009-03-13 2010-02-23 Weitbandige vhf und uhf antenne für zwei signale Active EP2406854B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10705349T PL2406854T3 (pl) 2009-03-13 2010-02-23 Antena dwukanałowa szerokopasmowa VHF-UHF

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0901187A FR2943183B1 (fr) 2009-03-13 2009-03-13 Antenne bi-voie large bande vhf-uhf
PCT/EP2010/052302 WO2010102901A1 (fr) 2009-03-13 2010-02-23 Antenne bi-voie large bande vhf-uhf

Publications (2)

Publication Number Publication Date
EP2406854A1 EP2406854A1 (de) 2012-01-18
EP2406854B1 true EP2406854B1 (de) 2014-03-26

Family

ID=41165187

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Application Number Title Priority Date Filing Date
EP20100705349 Active EP2406854B1 (de) 2009-03-13 2010-02-23 Weitbandige vhf und uhf antenne für zwei signale

Country Status (8)

Country Link
US (1) US9007270B2 (de)
EP (1) EP2406854B1 (de)
ES (1) ES2464493T3 (de)
FR (1) FR2943183B1 (de)
IL (1) IL215136A (de)
PL (1) PL2406854T3 (de)
SG (1) SG174388A1 (de)
WO (1) WO2010102901A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN2015DN00929A (de) * 2012-08-07 2015-06-12 Comrod As
US10038235B2 (en) * 2013-03-05 2018-07-31 Maxtena, Inc. Multi-mode, multi-band antenna
US9887462B2 (en) * 2013-10-31 2018-02-06 Motorola Solutions, Inc. Antenna with embedded wideband matching substrate
US9608336B1 (en) * 2015-08-25 2017-03-28 Edison Fong Radial-free collinear omni-directional triband half wavelength antenna with virtual ground, single coaxial cable feedpoint, and with minimal interaction of adjustment between bands
US11063345B2 (en) * 2018-07-17 2021-07-13 Mastodon Design Llc Systems and methods for providing a wearable antenna
US11757186B1 (en) * 2020-07-01 2023-09-12 Airgain, Inc. 5G ultra-wideband dipole antenna

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US5311201A (en) 1991-09-27 1994-05-10 Tri-Band Technologies, Inc. Multi-band antenna
US5307078A (en) * 1992-03-26 1994-04-26 Harada Kogyo Kabushiki Kaisha AM-FM-cellular mobile telephone tri-band antenna with double sleeves
FR2689688B1 (fr) * 1992-04-03 1994-08-19 Renault Aérien pour l'utilisation de plusieurs appareils émetteurs et/ou récepteurs notamment pour véhicules automobiles.
GB9520018D0 (en) * 1995-09-28 1995-12-06 Galtronics Uk Ltd Broad band antenna
US5812097A (en) * 1996-04-30 1998-09-22 Qualcomm Incorporated Dual band antenna
FR2758012B1 (fr) * 1996-12-27 1999-05-28 Thomson Csf Antenne double, en particulier pour vehicule
US7509250B2 (en) 2005-04-20 2009-03-24 Honeywell International Inc. Hardware key control of debug interface
US9104894B2 (en) 2005-12-16 2015-08-11 Hewlett-Packard Development Company, L.P. Hardware enablement using an interface

Also Published As

Publication number Publication date
US9007270B2 (en) 2015-04-14
WO2010102901A1 (fr) 2010-09-16
US20120119964A1 (en) 2012-05-17
SG174388A1 (en) 2011-10-28
FR2943183B1 (fr) 2012-04-20
IL215136A0 (en) 2011-12-29
EP2406854A1 (de) 2012-01-18
IL215136A (en) 2015-11-30
ES2464493T3 (es) 2014-06-03
PL2406854T3 (pl) 2014-08-29
FR2943183A1 (fr) 2010-09-17

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