Classifications

• • 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
  • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
  • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
  • H01Q5/364—Creating multiple current paths
  • H01Q5/371—Branching current paths
• • 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
  • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
  • H01Q5/364—Creating multiple current paths

Definitions

• Antenna block for particularly compact wireless device is provided.
• the present invention relates to a particularly compact antenna block for a wireless device, in particular for a mobile phone.
• the invention also relates to wireless devices for computer networks, in particular by transmission according to the Blue Tooth standard.
• the antenna block of the invention is intended to be used with one or the other of the frequencies involved or even one and then another successively.
• the invention mainly aims to simplify the production of radiating devices, antenna blocks, while giving them wider spectral performance and better adaptability to the environment in which they are to radiate.
• the antenna geometry particularly simple, imagined for such a radiation situation in two bands includes a zone metallized, generally in the shape of a letter L and a rectangular metallized zone capable of finding its place in the half-frame left by the L.
• this solution has separate power supplies for different antenna elements so that circuits switching circuits must be added to the electronic circuit to which this antenna is connected. These switching elements are in themselves generating difficulties. Operating. On the other hand, the high bands, UMTS, and very high bands, Blue Tooth, are not at all conceivable with such a network. . Such solutions are therefore bad. They induce in themselves connection switching, generating transmission or reception problems.
• an antenna the radiating part of which is formed by a planar metallized radiating layer.
• the planar radiating layer then comprises different designs forming radiating surface networks. These networks allow amplification by adapting the length of the conductive tracks which result from the drawings to the wavelength of the electromagnetic waves to be radiated by the antenna.
• a design known as an offset H signifying that insulating zones forming legs of the H delimit conductive tracks. These legs are not symmetrically arranged with respect to the horizontal insulating bar of the H.
• this antenna must be adapted to the impedance of the air and also take account of the penalizing circumstances, such as the proximity or not of the hand, or the head, of a user of a mobile telephone, or proximity to other structures, notably metallic. It appears in particular from the various possibilities of using a mobile telephone that this impedance must be able to be adapted. In particular, it is important to minimize the losses at the location of the transition zone between waveguide means, electrically connected to the output of the electronic transmission and reception circuit, and the radiating element of the antenna.
• miniaturization Iimite.de makes possible technical solutions.
• the invention thus aims to produce a broadband multi-frequency antenna.
• the advantage of having wide bands is to keep a significant gain of the antenna even in the presence of disturbing elements such as metallic masses which shift the tuning frequency of the antenna.
• the invention aims to minimize losses at the transition between waveguide means and a radiating or receiving element.
• this is obtained by providing a progressive transition zone between these two parts.
• the gradual transition zone is a continuous transition zone minimizing reflection losses and enabling broadband operation of the antenna.
• the area . of transition preferably has a length equivalent to the length of the radiating zone. Their difference is due to an inclination.
• provision has been made to remedy this problem by producing an antenna comprising a radiating zone and a transition zone, the transition zone being placed under the radiating zone. We could then show that by doing so we can have a larger transition zone since it can occupy in practice the same length as an antenna that it is supposed to connect.
• the metallization of a radiating zone and a transition zone, leading from an electronic circuit to the radiating zone is formed by a layer, preferably metallized, carried by the same frame ( but from below) than the one wearing the radiant layer.
• the subject of the invention is therefore an antenna block for a wireless device, comprising a radiating zone and a transition zone, the transition zone serving to connect the radiating zone to an emitting and / or electronic circuit of the wireless device, the zone radiant comprising a first metallic layer, characterized in that the transition zone comprises a second metallic layer, and in that the two layers are superimposed and electrically connected together by a metallic inversion.
• FIG. 2 a spectral diagram of measurements made with the antenna of Figures 1a to 1d showing the ratio of the energy reflected by the antenna to the energy emitted by it;
• FIG. 3a and 3b views from below and respectively from above in perspective, of an antenna unit according to one aspect of the invention
• - Figure 4 a sectional view of the radiating and transition zones, active area of the antenna of Figures 3a and 3b.
• Figure 1a shows an antenna block for a mobile phone.
• this antenna block includes a metallization 1 carried by a support 2, for example made of plastic or ceramic.
• the radiating zone 1 can thus be obtained by a deposit, in particular a deposit of metal vapor, then an etching of the metallized layer in order to produce in this metallized zone designs suitable for promoting resonance, and therefore emission or reception. of certain spectral components.
• the spectral components are precisely those recalled above.
• the radiating zone 1 includes a first design 3 in the form of an offset H.
• This drawing is also recalled in Figure 1b.
• a metallized tab 4 is aligned, but separated from another metallized tab 5.
• the two tabs 4 and 5 are bordered on either side by two etched slots 6 and 7.
• the two etched slots substantially of equal length, are interconnected by an engraved bridge 8 allowing the two tongues 4 and 5 to be compared.
• the slots 6 and 7 and the bridge 8 form insulating zones.
• the two tongues 4 and 5 are supplied by conduction channels 9 and 10 situated on the other side of the tongues respectively with respect to the etched slots 6 and 7.
• the conduction channels terminate in a connection base 11 of the antenna.
• the offset of the slots 6 and 7 is such that the slot 7 is generally closer to the base 11 than is the slot 6.
• the two tabs 4 and 5 also have different lengths 12 and 13 respectively, corresponding to lengths wave wave to be radiated by the antenna.
• the metallization 1 forming the antenna also includes a second drawing, also shown alone in FIG. 1c.
• This drawing is formed by two insulating etched slots 14 and 15 forming between them a tongue 16 and, on either side, two conduction channels 17 and 18 all three having their source in the base 11. Channels 17 and 18 and the tab 16 are connected together at their top 19 by an electric bridge.
• the two slots 14 and 15 make it possible to define a second length 20 corresponding to an average wavelength of a second resonance bandwidth.
• the antenna 1 finally comprises a third drawing materialized mainly by a wide band 21 whose length 22 makes it possible to define a third mean wavelength of a third resonance band of the antenna.
• Figure 1d shows the third individualized drawing.
• the three metallization drawings are joined together by the base 11 but are separated from each other by insulating zones. These insulating zones basically have three branches 23, 24 and 25 respectively opening out together in an insulating arm 26.
• the second drawing 14 - 20 is thus contained, between the branches 24 and 25, between the first drawing 3 - 13 and the second drawing of strip 21 - 22.
• the large strip 21 is also continued, on the side opposite the base 11 by a connection 27 perpendicular to the strip 21.
• the connection 27 is itself continued by a half strip 28 (of quarter wave type).
• the bands 21, 27 and 28 are connected by connecting zones 29 and 30, both comprising the particularity of having a cutaway 31 and 32 respectively.
• the cut sections 31 and 32 make it possible to transport the signal by avoiding reflections of likely to dampen the transmitted signal. We were able to measure that these cut sections were favorable for gain of the antenna 1 in the low frequency band.
• the branch 24 of insulation located between the first and the second design has, in the region of the base 11 an insulating zone 33 in the shape of a heel extending in the direction of the first design in H offset, from the second design with double slits 14 and 15.
• the heel 33 has a cutaway 34 conducive to the attenuation of the reflections as well as a means of controlled coupling of the radiation caused by the second design to the radiation caused by the first drawing.
• FIG. 2 shows a measurement result of the value of the ratio of the signal reflected by the antenna to the signal transmitted by the antenna. The peaks shown ultimately show the frequencies in which the antenna resonates correctly.
• FIG. 2 thus shows a first peak 35 corresponding to frequencies of the GSM 900 MHz type.
• the diagram in FIG. 2 shows a fourth peak 38 corresponding to the Blue Tooth standard and caused by the tongue 5. It will be observed that the two peaks 36 and 37 are connected by a wide band (with lower rejection and reflection rates at -10dB) allowing the antenna to operate with an acceptable gain in all the intermediate bands mentioned above.
• the antenna 1 has a dimension of 3.5 cm long by 2.5 cm wide.
• FIG. 3a and FIG. 3b show, in accordance with an object of the invention, a preferred connection circuit for an antenna in a mobile telephone.
• Figure 3a is a view of the antenna from below its radiation face.
• Figure 3b is a perspective view of the same antenna viewed from above, with the area of radiation visible.
• the radiation pattern shown on the radiating area is a special case.
• the antenna block for mobile telephone thus produced has a metallized and planar radiating zone 40.
• the zone 40 could be produced in the form of a metal plate.
• the metallized zone 40 is carried by a support 41 made of plastic or ceramic.
• the radiating zone 40 is connected to a transition zone 42, FIG. 3a, which is also preferably carried by the support 41.
• the two zones are metallizations, produced in particular in MID technology, then subsequently etched.
• the design of the metallization 40 is preferably that of FIG. 1a.
• the transition zone 42 is used to connect the zone 40 to an electronic transmitter and / or receiver circuit of a mobile telephone (not shown) and accessible by a connection 43.
• the antenna block 40-42 has the particularity that the two layers 40 and 42 are generally superimposed and electrically connected together by a metallic (or metallized) reversal 44.
• the fact of resting the metallizations 40 and 42 and the inversion 44 on the same support 41 gives great reproducibility to the mounting and to the behavior of the antenna once mounted.
• the superposition of the invention thus makes it possible to have a long transition zone, for example longer than the radiation zone, which is favorable to a better adaptation of impedance.
• the superposition is such that for example the inclination of the transition zone on the electronic circuit, or under the radiation zone, is of the order of or less than 30 degrees of angle, in any case less than 45 degrees. Due to this superposition, the transition layer is sandwiched between the electronic circuit and the radiating zone. With the overlay, the transition zone occupies no additional space above the electronic circuit.
• one end of the support 41 at the place where the inversion is intended to be placed, has a finer and rounded edge to make two surfaces communicate with each other, that carrying the metallization 40 and that carrying the metallization 42 In this case, this rounded edge forms a reversal allowing a metallization 44 to ensure continuity between a transition zone 42 and a radiation zone 40.
• the fact of producing the zone 42 underlying the zone 41 makes it possible to have for the area 42 a significant length, for example and preferably the length of the area 40. This length is measured in the direction of propagation of the signal to be radiated, from the connection 43 to the area 40.
• the reversal 44 is also shown as ending at the base 11 of the antenna of FIG. 1a.
• the support 41 also has the particularity that it generally has the shape of a corner. The corner has a refined shape at the location of the inversion 44. At the other end, the support 41 has a right foot 45 intended to rise substantially perpendicularly to a circuit 46 on which the antenna block will be mounted.
• the circuit 46 carries in particular the connection 43.
• the right foot 45 is provided with a console 47 itself pierced with an orifice 48 for engaging therein a screw for holding the antenna block 40-45 on the circuit 46.
• the connection between the transition zone 42 and the connection 43 can for example be carried out by a solder ball placed between this track and a primer 49 of the zone 42 at the location of the console 47. This solder ball is then melted at the time of connection.
• the wedge shape of the support 41 then gives the transition zone 42 the characteristic of gradually rising above the plane of the circuit 46.
• This progressive elevation, as well as the generally triangular shape of the transition zone 42 and that the height 50 above the circuit 46 where the radiating zone 40 is located are all parameters which make it possible to adapt the impedance of the antenna, and in particular to take account of the conditions of use mentioned above.
• the width of the transition zone thus increases by the width of the connection 43 until it reaches the width of the base 11 of the radiating zone.
• the growth function is a linear function, varying with the length of the zone 42 and with the height 50 of the transition zone. By doing so, a constant impedance of the connection is obtained in all sections of zone 42.
• the width of a section at each location in zone 42 is calculated mainly as a function of the height of this section relative to the ground plane , and this for the desired impedance.
• the circuit 46 carries, at the place where the antenna block 40-45 is placed, a ground plane 51.
• the ground plane 51 In the case where the ground plane 51 is present, on the one hand the length of l the radiating element must be close to a quarter of the minimum wavelength to transmit and / or receive, or be close to half a wavelength if there is no ground plane 51.
• the latter can be provided with a post 52 located near the turning edge 44. This post 52 can also be used to electrically connect the turning point 44 ( and in other words the base 11) in the ground plane 51.
• the post 52 may include a metallization 53 communicating with the radiating zone 40.
• a second post can be envisaged on the other side of the support 41.
• FIG. 4 shows the appearance of the metallizations carried by the wedge-shaped support 45.
• the curvature of the metallization 44 has a radius substantially equal to a third of the height 50. In a preferred example, this height 50 is 0.8 cm.

Landscapes

• Waveguide Aerials (AREA)
• Support Of Aerials (AREA)
• Details Of Aerials (AREA)

Applications Claiming Priority (5)

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ID=26212985

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Citations (1)

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• 2002
  • 2002-04-16 EP EP02727662A patent/EP1382086A1/de not_active Withdrawn
  • 2002-04-16 CN CNA028059336A patent/CN1494749A/zh active Pending
  • 2002-04-16 WO PCT/FR2002/001311 patent/WO2002087015A1/fr not_active Application Discontinuation
  • 2002-04-16 US US10/475,598 patent/US7199755B2/en not_active Expired - Fee Related
  • 2002-04-16 KR KR1020037013773A patent/KR100589065B1/ko not_active IP Right Cessation
  • 2002-04-22 TW TW091108234A patent/TW565966B/zh active

Patent Citations (1)

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