EP2736118A1 - Antennensystem mit ineinander verschachtelten Regelkreisen, und Fahrzeug, das ein solches Antennensystem umfasst - Google Patents

Antennensystem mit ineinander verschachtelten Regelkreisen, und Fahrzeug, das ein solches Antennensystem umfasst Download PDF

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Publication number
EP2736118A1
EP2736118A1 EP13194112.2A EP13194112A EP2736118A1 EP 2736118 A1 EP2736118 A1 EP 2736118A1 EP 13194112 A EP13194112 A EP 13194112A EP 2736118 A1 EP2736118 A1 EP 2736118A1
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EP
European Patent Office
Prior art keywords
filiform
antenna system
elements
antenna
filiform elements
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
EP13194112.2A
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English (en)
French (fr)
Other versions
EP2736118B1 (de
Inventor
Frédéric Ngo Bui Hung
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Thales SA
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Thales SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • 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
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system

Definitions

  • the present invention relates to loop antenna systems.
  • the invention relates to a loop antenna system comprising a first electrically conductive filamentary element forming a loop portion.
  • the filiform conducting element of these systems generates a radiating surface.
  • the instantaneous bandwidth of these systems is low because of the smallness of the resistance of radiation R r .
  • a known solution for increasing the radiation resistance R r of these antennal systems is to increase the physical length of the filiform element, which results in an increase in the area S of the radiation surface.
  • the increase in the dimensions of the filiform element tends to place the anti-resonance frequency of the antennal system, that is to say the frequency where the input impedance of the antenna becomes very large. and difficult to adapt, in the range of useful frequencies of the system, which prevents the use of the antenna system at frequencies close to this anti-resonance frequency and therefore over the entire range of useful frequencies.
  • a high energy efficiency for this type of system requires limiting the useful bandwidth.
  • One of the objects of the invention is to propose an antennal system that does not have these disadvantages.
  • the invention relates to an antennal system of the aforementioned type, characterized in that the antenna system further comprises a second filamentary element electrically conductive and forming a loop portion, and in that the two filiform elements have lengths different from each other.
  • the invention relates to a land vehicle, air or naval, characterized in that it comprises at least one antenna system according to the invention.
  • the vehicle comprises two antenna systems according to the invention, the antenna systems being identical to one another and being arranged side by side and parallel to each other.
  • the Figure 1 illustrates a machine 2 according to the invention.
  • the vehicle 2 is intended for land application, and is for example an all-terrain vehicle.
  • the machine 2 comprises an antenna loop system 4 according to the invention, hereinafter system 4, as well as a metal surface 6.
  • the metal surface 6 includes the roof and the hood of the vehicle.
  • the system 4 is intended to operate in the frequency range 2 MHz - 30 MHz, and preferably in the frequency range 2 MHz - 12 MHz.
  • the system 4 comprises a ground plane 7, two filamentary elements of respective references 8a, 8b and a mounting base 10, hereinafter base 10.
  • the system 4 comprises an impedance matching box 12, also known as the English “Antenna Tuning Unit” (referred to as ATU 12), and a connecting cable 14 connecting the ATU 12 to the base 10.
  • the ground plane 7 of the system 4 is able to provide a mass reference to the system 4 and is formed by the metal surface 6 of the machine 2.
  • the filiform elements 8a, 8b are electrically conductive and are adapted to emit and receive electromagnetic waves. They are for example made from copper steel.
  • they comprise a fiberglass core surrounded by a copper braid, or are made from any suitable material known to those skilled in the art.
  • filiform is meant that the dimensions of the elements 8a, 8b in the direction of their length are of an order of magnitude much greater than the order of magnitude of the dimensions of the elements 8a, 8b according to the other directions, and that the dimensions of elements 8a, 8b in directions other than its length are of substantially the same order of magnitude.
  • the filiform elements 8a, 8b are elastically deformable.
  • the filiform elements 8a, 8b consist of a single section.
  • At least one of the filiform elements 8a, 8b is made from a plurality of sections connected to each other. They are then mounted or disassembled respectively to assemble, disassemble the filiform element 8a, 8b corresponding. This has the effect of minimizing the size of the system 4 on the machine 2 when the system 4 is not required.
  • the filiform elements 8a, 8b have respective lengths I a , I b having an order of magnitude less than the wavelengths of the preferential working frequencies of the system 4.
  • the filiform elements 8a, 8b have lengths I a , I b of between 3 m and 6 m.
  • the filiform elements 8a, 8b have lengths I a , I b of between 3 m and 10 m. This variant is advantageously implemented when the machine 2 has a suitable size to do this.
  • the lengths I, Ib filiform elements 8a, 8b are different from each other.
  • the filiform element 8a is the shortest of the two.
  • the length l a, I b of the filiform element 8a, 8b is longer than the length l a, I b of the filiform element 8a, 8b shortest more than 50%.
  • the length I a , I b of the filiform element 8a, 8b the longest is substantially equal to twice the length I a , I b of the filiform element 8a, 8b the shortest. This is an optimal compromise between the congestion of the system 4 and its radio performance.
  • the filiform elements 8a, 8b are fixed on the ground plane 7.
  • each element 8a, 8b is inserted into the base 10 in an orifice (not shown) that the base 10 comprises.
  • each element 8a, 8b is fixed on the ground plane 7 via a grounding piece well known to those skilled in the art.
  • the filiform elements 8a, 8b each form a loop portion.
  • the dimensions of the loop portions are obtained by properly positioning the location of the attachment on the ground plane 7 of the end of the filiform elements 8a, 8b via the grounding piece.
  • the two filiform elements 8a, 8b, and therefore the portions of loops that they delimit, are substantially included in a plane P a , respectively P b .
  • the two planes P a , P b form between them an angle ⁇ .
  • the value of the angle ⁇ contributes to determining the level of radioelectric coupling between the radiating surfaces formed by the filiform elements 8a, 8b.
  • the angle ⁇ between the planes P a , P b is less than 45 °, and preferably less than 10 °.
  • the angle ⁇ is substantially zero, which maximizes the radio-frequency coupling between the radiating surfaces and minimizes the lateral size of the antennal system.
  • the value of the angle ⁇ is likely to vary under the effect of the acceleration and deceleration of the machine 2.
  • the filiform elements 8a, 8b are sufficiently rigid so that the angle ⁇ remains less than 45 °, and preferably less than 10 ° during the displacement of the machine 2.
  • the necessary rigidity is obtained by varying the diameter of filiform elements 8a, 8b.
  • the filiform elements 8a, 8b each generate a radiation surface S1, respectively S2 delimited on the one hand by the corresponding filiform element, and on the other hand by the ground plane 7.
  • the radiation surfaces S1, S2 are substantially included in the corresponding plane P a , P b .
  • the two radiation surfaces S1, S2 have the same general shape.
  • the surfaces S1, S2 formed by the elements 8a, 8b are both substantially semicircular.
  • the loop portions formed by the filiform elements 8a, 8b both form rectangle or triangle portions.
  • the surfaces S1, S2 have a general shape different from each other.
  • the two surfaces S1, S2 have different areas.
  • S1 will designate the radiation area of smaller area of the two, that is to say the area delimited by the small filiform element 8a.
  • the loop portions formed by the two filiform elements 8a, 8b are nested one inside the other.
  • the surface S1 appears as fully included in the surface S2 when the system 4 is observed from the side.
  • This nesting has the effect of minimizing the congestion of the system 4.
  • the base 10 makes it possible to fix the filiform elements 8a, 8b on the ground plane 7 while ensuring the electrical insulation of the filiform elements of the ground plane, and allows the electrical connection of the filiform elements to the connection cable 14 and to the ATU 12.
  • the base 10 comprises a first portion 101 electrically insulating and a second portion 102 electrically conductive.
  • the two parts 101, 102 are cylindrical and have the same diameter.
  • the first part 101 is fixed on the ground plane 7 and is made of electrically insulating dielectric material.
  • the second part 102 is fixed on the first part 101 and is made of metal. Because of the first part 101, it is electrically isolated from the ground plane 7.
  • the second portion 102 is provided with the orifices (not shown) in which one of the ends of each of the filiform elements 8a, 8b is fixed, as indicated above.
  • the second portion 102 receives one end of the connection cable 14.
  • connection cable 14 is electrically connected to the ends of the two filiform elements 8a, 8b inserted in the base 10.
  • the ATU 12 is adapted to adapt the impedance of the system 4, that is to say to maximize the electrical power exchanged between the system 4 respectively and an RF transmission / reception device (not shown) to which the system 4 is coupled.
  • ATU 12 is on the ground plane 7.
  • it is located on board the machine 2, for example in a cavity located under the ground plane 7.
  • the ATU 12 is electrically connected to the base 10 via the connection cable 14, and provides the same radiofrequency signal to the two filiform elements 8a, 8b.
  • the ATU 12 delivers the same RF signal to the filiform elements 8a, 8b through the base 10. The current flows through the filiform elements 8a, 8b and loops back to the ground plane 7.
  • the anti-resonance frequency of the system 4 is modified with respect to a system having a single filiform element, and more specifically is distinct from the frequency of anti-resonance that would present the system comprising only one or other filiform elements 8a, 8b.
  • the coupling of the filiform elements 8a, 8b in the system 4 according to the invention lowers the impedance of the system to its anti-resonance frequency, and allows its adaptation by an ATU, and thus improves its performance. global energy.
  • the instantaneous bandwidth of the system according to the invention which derives from the radiation resistance, is substantially increased because it comprises two radiation surfaces S1, S2, and therefore a total radiation surface greater than that of a system comprising only one or the other filiform elements 8a, 8b.
  • the impedance of the 3 MHz system is 0.002 + 66 j ⁇ .
  • the anti-resonance frequency of this system is 23.7 MHz.
  • the system impedance at this anti-resonance frequency is 19000 ⁇ .
  • the radiation resistance - which corresponds to the real part of the impedance - of the system 4 at low frequencies has substantially increased, and more precisely substantially doubled.
  • the impedance of the system 4 at its anti-resonance frequency has decreased by a ratio close to ten.
  • the machine 2 is a ship, the metal surface 6 corresponding for example to the deck of the ship.
  • the filiform elements it is preferable to make the filiform elements so that their mechanical strength is greater than that of the elements of a system adapted for a land vehicle.
  • the filiform elements 8a, 8b consist of a tube or of several tubes fixed successively to each other, for example by welding.
  • the tubes are for example made from aluminum.
  • the machine 2 comprises two systems 4 according to the invention substantially identical to one another and arranged side by side substantially parallel to each other.
  • the metal surface 6 of the machine 2 forms the common ground plane 7 of the two systems 4.
  • the ATUs 12 of the two systems 4 are both connected to the same transmission / reception device associated with the systems 4, for example via a power divider, and are for example controlled in accordance with the command described in FIG. FR 2 829 622 .
  • This variant of the vehicle 2 according to the invention has the effect of increasing the allowable power of the device formed by the two systems 4 arranged in parallel, as well as increasing the radiation resistance corresponding to the low frequencies of the range of use.
  • the system 4 does not include a ground plane 7.
  • the base 10 consists solely of the electrically conductive second portion 102 previously described
  • system 4 comprises a secondary base 10 'identical to the base 10.
  • the two bases 10, 10 ' are respectively connected to one of two symmetrical channels 121, 122 that comprises the ATU 12 and are fixed vertically to the ATU 12, for example by means of conductive rigid connecting rods. electrically and arranged parallel to one another, and which provide the same function as the connection cable 14 described above and the physical maintenance of the assembly.
  • each filamentary element 8a, 8b are for one inserted in the base 10, and for the other in the secondary base 10 '.
  • the loop portions formed by the filiform elements 8a, 8b both have a substantially circular shape.
  • the radiation surfaces S1, S2 are generated solely by the filiform elements 8a, 8b.
  • This variant is advantageously implemented when it is not possible or when it is not desired to use a ground plane.
  • the loop portions both have a generally triangular or rectangular shape.
  • the two loop portions defined by the filiform elements 8a, 8b are nested one inside the other, respectively substantially contained in a plane, the two planes thus defined forming an angle less than 45 °, and preferably lower at 10 °.
  • This variant of the invention may in turn be implemented on a machine 2 according to the invention, in which two systems according to this variant of the invention are arranged side by side with each other, the two planes P has filiform elements 8a, 8b of one and the other of the systems being substantially parallel and located at a distance from each other between 50 cm and 100 cm.
  • the vehicle 2 is an aircraft.
  • the system 4 is devoid of ATU 12.
  • the filiform elements 8a, 8b are for example directly connected to the radiofrequency transmission / reception device which device 4 is coupled.
  • the two filiform elements 8a, 8b are also powered with the same radio frequency signal.
  • the coupling of the filiform elements 8a, 8b resulting in particular from their supply by the same radio frequency signal makes it possible to lower the impedance of the antenna system 4 to its anti-resonance frequency.
  • the system 4 is configured for transmitting and receiving electromagnetic waves by ionospheric reflections.
  • the filiform elements 8a, 8b are intended to radiate mainly in a direction of vertical radiation.
  • the antenna 4 is configured to mainly radiate in a direction of radiation orthogonal to the ground plane 7.
  • the ground plane 7 is then arranged substantially horizontally.
  • the antenna 4 is configured to radiate mainly along a median axis loops formed by the filiform elements 8a, 8b and passing between the base 10 and the sub-base 10 '.
  • the direction of radiation of the antenna 4 results from the ratio between the wavelengths of the frequencies preferentially used by the system 4 and the length of the filiform elements 8a, 8b. More particularly, the length of the filiform elements 8a, 8b is smaller than the wavelengths of the preferential frequencies of the system 4. For example, a frequency of 2 MHz corresponds to a wavelength of 150 m, and a frequency of 12 MHz corresponds to a length of 25 m. These lengths are of an order of magnitude greater than the length of the filiform elements 8a, 8b.
EP13194112.2A 2012-11-23 2013-11-22 Antennensystem mit ineinander verschachtelten Regelkreisen und Fahrzeug, das ein solches Antennensystem umfasst Active EP2736118B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1203159A FR2998722B1 (fr) 2012-11-23 2012-11-23 Systeme antennaire a boucles imbriquees et vehicule comprenant un tel systeme antennaire

Publications (2)

Publication Number Publication Date
EP2736118A1 true EP2736118A1 (de) 2014-05-28
EP2736118B1 EP2736118B1 (de) 2020-04-15

Family

ID=48236999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13194112.2A Active EP2736118B1 (de) 2012-11-23 2013-11-22 Antennensystem mit ineinander verschachtelten Regelkreisen und Fahrzeug, das ein solches Antennensystem umfasst

Country Status (5)

Country Link
US (1) US9559420B2 (de)
EP (1) EP2736118B1 (de)
ES (1) ES2802774T3 (de)
FR (1) FR2998722B1 (de)
MY (1) MY181340A (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217591A (en) * 1978-09-20 1980-08-12 The United States Of America As Represented By The Secretary Of The Army High frequency roll-bar loop antenna
EP0897200A1 (de) * 1997-08-12 1999-02-17 Thomson-Csf Halbschleifenantenne für hohe Frequenzen
EP1246299A2 (de) * 2001-03-26 2002-10-02 Matsushita Electric Industrial Co., Ltd. M-förmige Antenne
FR2829622A1 (fr) 2001-09-11 2003-03-14 Thales Sa Systeme antennaire a rendement elevee et a forte puissance
US20120056790A1 (en) * 2010-09-06 2012-03-08 Lite-On Technology Corp. Multi-loop antenna system and electronic apparatus having the same

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368174A (en) * 1942-08-12 1945-01-30 Ford Motor Co Antenna
US3588905A (en) 1967-10-05 1971-06-28 John H Dunlavy Jr Wide range tunable transmitting loop antenna
JPH0286201A (ja) * 1988-09-21 1990-03-27 Harada Ind Co Ltd 自動車用ループアンテナ
US6744213B2 (en) * 1999-11-15 2004-06-01 Lam Research Corporation Antenna for producing uniform process rates
US6696954B2 (en) * 2000-10-16 2004-02-24 Amerasia International Technology, Inc. Antenna array for smart RFID tags
JP2004266311A (ja) * 2003-01-15 2004-09-24 Fdk Corp アンテナ
US6906672B1 (en) * 2003-07-25 2005-06-14 R.A. Miller Industries, Inc. Planar Antenna Arrangement
CN103647156B (zh) * 2008-07-17 2015-10-14 高通股份有限公司 高频无线功率发射天线的自适应匹配和调谐
JP2010119067A (ja) * 2008-11-14 2010-05-27 Toyota Central R&D Labs Inc アンテナ装置
JP2010200207A (ja) * 2009-02-27 2010-09-09 Nec Corp 多重ループアンテナ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217591A (en) * 1978-09-20 1980-08-12 The United States Of America As Represented By The Secretary Of The Army High frequency roll-bar loop antenna
EP0897200A1 (de) * 1997-08-12 1999-02-17 Thomson-Csf Halbschleifenantenne für hohe Frequenzen
EP1246299A2 (de) * 2001-03-26 2002-10-02 Matsushita Electric Industrial Co., Ltd. M-förmige Antenne
FR2829622A1 (fr) 2001-09-11 2003-03-14 Thales Sa Systeme antennaire a rendement elevee et a forte puissance
US20120056790A1 (en) * 2010-09-06 2012-03-08 Lite-On Technology Corp. Multi-loop antenna system and electronic apparatus having the same

Also Published As

Publication number Publication date
ES2802774T3 (es) 2021-01-21
FR2998722B1 (fr) 2016-04-15
US9559420B2 (en) 2017-01-31
US20140145905A1 (en) 2014-05-29
EP2736118B1 (de) 2020-04-15
MY181340A (en) 2020-12-21
FR2998722A1 (fr) 2014-05-30

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