Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith

Definitions

• the present invention relates to a meandering antenna.
• Many types of meandering antennas are already known.
• US patent application 2004/0145523 discloses a magnetic dipole antenna coupled to a ground plane.
• US Pat. No. 6,094,170 describes an antenna comprising a dielectric plate on which a "microstrip" line is formed, comprising a mass formed at the rear of the plate.
• US Pat. No. 5,754,143 describes an antenna comprising a conductive sheet on which a meandering slot is made.
• US Patent 6,111,545 discloses an antenna having a meander shaped conductor with a return at one end.
• the invention aims in particular to provide a meandering antenna having a relatively small footprint while ensuring a satisfactory radiation efficiency.
• the invention thus relates to a meandering antenna comprising:
• a first meandering conducting element comprising a plurality of arms, two consecutive arms forming a meander
• a second conductive element forming with the first conductive element a two-wire radiating line, the second conductive element comprising a plurality of arms each engaging between two consecutive arms of the first conductive element.
• the term "meander" may include a continuous curve without branch point and having a basic pattern, a variation of a basic pattern or different basic patterns successively repeated in a predetermined direction.
• At least one of the first and second conductive elements may have a meandering shape in rectangles.
• the invention can make it possible to obtain a miniaturized antenna which has a very satisfactory radiation efficiency, compared to meandered antennas. known, without two-wire line, thanks in particular to the increase of the equivalent area in the case of the antenna according to the invention.
• the antenna according to the invention with a two-wire line, can be advantageously arranged to operate without mass element, which further reduces the size of the antenna.
• the antenna is not connected to a mass element.
• the antenna may be of the transmitter and / or receiver type.
• the antenna according to the invention can be arranged, if necessary, to operate in a predetermined range of frequencies, and not in several frequency separated intervals.
• the antenna may be arranged to operate in a range from 50 MHz to 150 MHz, for example from 80 MHz to 100 MHz.
• the antenna according to the invention may comprise parasitic elements constituted for example by one or more metal strips of different geometrical shapes that can be incorporated in a pattern, these elements being continuous or discontinuous in order to increase the equivalent area.
• the two-wire line has two ends, the first and second conductive elements being arranged in open circuit at both ends of this two-wire line.
• the first and second conductive elements are arranged in a short circuit at one end of the two-wire line and in open circuit at the other end.
• the first and second conductive elements are arranged in short circuit at both ends of the two-wire line.
• the second conductive element comprises at least two consecutive arms, in particular substantially parallel, forming a meander of the second conductive element, these two arms engaging between two consecutive arms of the first conductive element.
• the first and second conductive elements may for example extend along parallel paths over substantially their entire length.
• the second conductive element comprises an arm extending between two consecutive arms of the first element. conductor, said arm of the second conductive element defining with each of said arms of the first conductive element a portion of the two-wire line.
• the two consecutive arms of the first conductive element share a same portion of the second conductive element to locally form the two-wire line.
• At least one of the conductive elements in particular each of the two conductive elements, comprises a conductive wire or is formed by a conductive track on an insulating substrate.
• at least one of the conductive elements may be formed by a conductive track of a printed circuit board.
• the conductive elements of the antenna may be metallic.
• the two-wire line of the antenna is powered by a capacitive coupling.
• the antenna is preferably fed on one side of the two-wire line, substantially adjacent to said open-circuit end, by the capacitive coupling.
• the antenna is advantageously fed on one side of the two-wire line, distant from the ends thereof, by the capacitive coupling, this side being able to be for example located substantially in a zone central of the two-wire line.
• the impedance matching is ensured by the excitation of the antenna through a capacitance in series, this capacity being obtainable for example by means of two parallel metallic conductors between which a potential difference is applied for excitation. .
• the two-wire line advantageously has a length in the unfolded state close to or more than a quarter of the wavelength corresponding to the resonant frequency of the antenna.
• FIG. schematically and partially, an antenna according to the invention
• - Figures 2 to 4 show, schematically and partially, antennas according to alternative embodiments of the invention.
• a meandering antenna 1 according to the invention, which can be used for example in the following areas: mobile phones, televisions, radios, etc.
• the antenna 1 comprises a first conducting element 2 having a plurality of arms 3 forming pairs of meanders, these arms 3 being rectilinear and connected in pairs by a rectilinear portion 4 perpendicular to the arms 3.
• the first conductive element 2 thus has a meandering shape in rectangles.
• the arms 3 may be parallel, as shown in FIG.
• the arms 3 may be arranged relative to each other in an inclined, non-parallel manner, forming for example at each junction of two consecutive arms 3 a rounded bend.
• the antenna 1 comprises a second conductive element 5 forming with the first conductive element 2 a radiating two-wire line 9.
• the second conductive element 5 has, in the example considered, a meandering shape in rectangles, like the first conductive element 2, the first and second conductive elements 2 and 5 extending along parallel paths over substantially their entire length. .
• the second conductive element 5 comprises parallel arms 6 engaging in pairs between two consecutive arms 3 of the first conductive element 2.
• the first and second conductive elements 2 and 5 may have substantially the same length, corresponding to the length of the two-wire line.
• the first and second conductive elements 2 and 5 may each be formed by a conductive track of a printed circuit board. Alternatively, the first and second conductive elements 2 and 5 may be formed by metal wires for example.
• the two-wire line 9 has two ends 10 and 11.
• the two-wire line 9 is open at both ends 10 and 11, being fed by a capacitive coupling 12, on a side 13 of the two-wire line 9, adjacent to one of the ends 10 and 11.
• the two-wire line 9 is short-circuited at its two ends 10 and 11, the two-wire line 9 being fed by a capacitive coupling 12, on a side 14 of the line 9 situated substantially in a central area of it.
• the two-wire line 9 is short-circuited at one of the ends 11 and in open circuit at the other of the ends 10, this line being powered by a capacitive coupling 12, on one side 15 of the line 9, adjacent the end 10 in open circuit.
• the invention can reduce the distance d above, between two consecutive arms 6 of the conductive element 5 until these arms 6 are merged.
• the second conductive element 5 may comprise a plurality of arms 6 each extending between two consecutive arms 3 of the first conductive element 2, each arm 6 defining with each of the arms 3 located on either side arm 6 a portion of the two-wire line 9.
• the invention thus considerably reduces the size of the antenna while ensuring a satisfactory radiation efficiency.

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• Details Of Aerials (AREA)

Applications Claiming Priority (2)

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• 2005
  • 2005-06-02 FR FR0551484A patent/FR2886770B1/fr not_active Expired - Fee Related
• 2006
  • 2006-05-30 WO PCT/FR2006/050492 patent/WO2007003827A2/fr active Application Filing
  • 2006-05-30 CN CN2006800193313A patent/CN101189755B/zh not_active Expired - Fee Related
  • 2006-05-30 US US11/920,834 patent/US7911396B2/en not_active Expired - Fee Related
  • 2006-05-30 JP JP2008514168A patent/JP2008543197A/ja active Pending
  • 2006-05-30 EP EP06794470A patent/EP1894270A2/de not_active Ceased

Non-Patent Citations (1)

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