Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
  • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/08—Means for collapsing antennas or parts thereof
  • H01Q1/084—Pivotable antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
• • 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
  • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
  • H01Q9/20—Two collinear substantially straight active elements; Substantially straight single active elements

Definitions

• the present invention relates to a diversity antenna system comprising at least two dipole type antennas.
• the present invention relates more particularly to an antenna system of the above type for the reception of television signals, in particular the reception of digital signals on a portable electronic device such as a laptop commonly called PC, a PVA (for Assistant Personnel) or for other similar devices requiring an antenna system to receive electromagnetic signals.
• the present invention also relates to a support for the antenna system for attachment to the portable device.
• the devices currently on the market are most often constituted by an independent antenna such as a whip or loop antenna mounted on a housing comprising a USB connector.
• the Applicant has proposed in French Patent Application No. 05 51009 filed April 20, 2005, a compact broadband antenna covering the entire UHF band consisting of a dipole type antenna.
• This antenna is associated with an electronic card that can connect to a portable device using a USB type connector.
• the antenna described in French Patent Application No. 05 51009 comprises a first and a second conductive arm supplied in differential, one of said arm said first arm forming at least one cover for an electronic card.
• the first arm is in the form of a housing in which is inserted the electronic card which comprises the processing circuits of the signals received by the dipole type antenna.
• the present invention relates to a diversity antenna system comprising at least two dipole type antennas each formed of a first and a second conducting arm, supplied with a differential.
• the two antennas comprise a common arm said first arm forming at least one cover for an electronic card and each a second arm rotatably mounted at one end of the first arm.
• the second arms are rotatably mounted at one end of the first arm about a common axis and, preferably, the second arms have profiles identical to and complementary to the profile of the first arm so as to be able to fold over one side of the first arm.
• each second arm is rotatably mounted at one end of the first arm about a proper axis.
• the second arms have identical profiles corresponding to the side walls of the housing formed by the first arm.
• the second arms may also have complementary profiles for folding on one of the upper and / or lower faces of the first arm.
• the first arm has the shape of a housing, in which is inserted an electronic card, more particularly the electronic card used to process the signals received by the antenna and send them to a portable display apparatus such as a laptop or the like.
• the electronic card comprises at one end at least two connection ports for the supply of each antenna of the system and at the other end a connection port formed, for example, by a USB connector allowing the connection to a portable electronic device such as a laptop or the like.
• the present invention relates to a support for the antenna system comprising a fixing means on the adjustable portable device and means for receiving the first arm of the system rotatably mounted on the fastening means.
• Figure 1 is a schematic perspective view of an antenna as described in the French patent application 05-51009 in the name of the applicant.
• Figure 2 shows the radiation patterns in gain of the antenna of Figure 1 for the different positions of the second arm.
• Figure 3 is a schematic perspective view of a first embodiment of an antenna system according to the present invention.
• FIG. 4 represents the adaptation and isolation curves without an adaptation circuit for an antenna system according to FIG.
• FIG. 5 represents the adaptation and isolation curves with an adaptation circuit for an antenna system according to FIG.
• Figure 9 shows respectively in A a top view and B a schematic perspective view of a second embodiment of an antenna system according to the present invention.
• Figure 10 shows the radiation patterns for the system of Figure 9 with an angle ⁇ equal to 135 °, respectively for a power supply on port 1 and for a power supply on port 2.
• FIG. 11 represents the radiation patterns for the antenna system of FIG. 9 when the angle ⁇ is equal to 90 ° respectively for a power supply on port 1 and on port 2.
• Figure 15 shows the yield curves of the antenna system of Figure 12.
• Figure 16 shows the gain curves of the antenna system of Figure 12.
• FIG. 18 shows another embodiment of an antenna system according to the present invention.
• FIG. 18 represents the simulation results obtained for an antenna system as represented in FIG. 17.
• Figure 19 shows schematically in perspective yet another embodiment of an antenna system according to the present invention.
• 20 shows in A a view from above and B is a schematic perspective view of another embodiment of an antenna system according to the present invention.
• Figure 21 schematically shows an electronic card used with an antenna system according to the present invention.
• Figure 22 shows in perspective a support for the antenna system according to the invention.
• Figure 23 is an enlarged perspective view of the support of Figure 22.
• FIGS. 1 and 2 We will firstly describe with reference to FIGS. 1 and 2, an embodiment of a dipole-type antenna that can be used to receive digital terrestrial television on a laptop computer in accordance with French Patent Application No. 05 51009. name of the plaintiff.
• this dipole antenna comprises a first conducting arm 1 and a second conducting arm 2, the two arms being connected to each other via a hinge zone 3 located at one end of each arm.
• the arm 1 has substantially the shape of a housing with a portion 1a of substantially rectangular shape extending by a curved portion 1b flaring gradually to allow the energy to be radiated gradually favoring thus adapting to a wider frequency band.
• the length of the arm 1 is substantially equal to ⁇ / 4 where ⁇ represents the wavelength at the central operating frequency.
• the length of the arm 1 is close to 112 mm for operation in the UHF band (band between 470 and 862 MHz).
• the antenna comprises a second arm 2 rotatably mounted about the axis 3 which also represents the connection point of the antenna to the signal processing circuit.
• the electrical connection of the antenna is made by a metal wire, for example a coaxial cable or the like while the axis of rotation is made of a material relatively transparent to electromagnetic waves.
• the arm 2 whose length is substantially equal to ⁇ / 4, has a curved profile followed by a rectangular flat portion, for folding the arm 2 completely against the arm 1 in the closed position.
• the arm 2 being rotatably mounted relative to the arm 1, this makes it possible to modify the orientation of the arm 2 so as to optimize the reception of the television signal.
• FIG. 2 shows the simulated radiation pattern of an antenna conforming to that shown in FIG. 1 at a frequency of 660 MHz for the different positions of the arm 2 shown in FIG. 1.
• the radiation diagrams are inclined depending on the angle of inclination of the arm. This inclination thus makes it possible to optimize the reception of the digital television signal.
• FIGS. 3 to 8 of a first embodiment of a diversity antenna system in accordance with FIG. the present invention realized using the principle of the antenna described with reference to Figures 1 and 2.
• an antenna system comprises two antennas constituted by a first common arm forming at least the cover of an electronic card making it possible to process the signal received by the antenna.
• the common arm 10 has an upper portion or cover member 10a and a lower portion 10b, the assembly forming a housing for receiving an electronic card for processing the received signals. Simulations have been carried out on a system as shown in FIG.
• the material used is copper of conductivity 4.9 * 10 e 7S / m
• the length of the arm 11 is approximately equal to 112mm
• the radius of curvature used for the parts 10a, 10b, 11, 12 is 31mm
• the width of the arms 10, 11 and 12 is approximately 25mm so as to be able to insert the electronic card of width 20mm .
• FIG. 4 shows the adaptation curves S (1, 1) and S (2.2) and the isolation curve S (2.1) of the antenna system of FIG. 3 when the second arms form relative to each other.
• the curves are simulated with a system without adaptation cell.
• the curves show that the adaptation is performed on a relatively narrow band that can be improved by using an adaptation cell.
• This cell is conventionally constituted by an LC circuit.
• the adaptation and isolation curves with adaptation cell are shown in Figure 5. In this case, the adaptation is performed on a larger frequency band.
• the insulation between the first antenna formed of the first arm 10 and the second arm 11 and the second antenna formed of the first arm 10 and the second arm 12 remains sufficient to provide a significant gain in diversity, especially taking into account the vertical polarizations for the first antenna and horizontal for the second antenna as well as strong decorrelations of radiation pattern as shown in Figure 6.
• the radiation patterns of FIG. 6 show a maximum decoupling and an optimal decorrelation between the two accesses when the two second branches 11, 12 are positioned perpendicularly with respect to each other.
• the two arms 11 and 12 are held at positions perpendicular to each other whatever the angle ⁇ of the first antenna, for example to say antenna constituted by the first common arm 10 and the second arm 11.
• the efficiency of the antenna system is greater than 50% over almost the entire UHF band, which meets the desired performance.
• An average gain around OdBi over the entire UHF band corresponds to a 3dBi directivity for this type of antenna with a yield of 50%.
• FIGS. 9 to 11 A further embodiment of an antenna system according to the present invention will now be described with reference to FIGS. 9 to 11.
• the antenna system comprises two dipole type antennas formed of a first arm 20 common to the two antennas.
• Each antenna has a second arm 21, 22 rotatably mounted at one end of the first arm.
• Each second arm 21, 22 pivots independently around two axes of rotation 23, 24 separate.
• the two arms 21, 22 can form the side walls of the first common arm 20, as will be explained in more detail below.
• the first common arm 20 comprises a rectangular portion 20a forming a housing for an electronic card for, for example, the processing of electromagnetic signals received or transmitted by the antenna system.
• the rectangular portion 20a is extended by a curved portion 20b flaring out gradually.
• the two second arms 21, 22 have a profile adapted to the side portions of the first conductive arm 20. More specifically, they have a substantially rectangular portion extending through a curved portion.
• the arms 21 and 22 can be oriented with respect to the first arm 20 at angles ⁇ 1 and ⁇ 2 which therefore represent the opening angle between the second arm 22 and the arm respectively. 20 and the second arm 21 and the arm 20.
• the two axes of rotation 23 and 24 being distant from each other, there is observed, in addition to a diversity of radiation, a spatial diversity related to the spatial separation of the two antennas formed by the di poles 21, 20 and 22, 20.
• the two second arms 21 and 22 being rotatably mounted around two separate axes 23, 24 provided at the end of the first arm 20, it is possible to rotate them so that in the unused position, the two arms 21, 22 fold on the lateral faces of the first common arm 20 giving a compact system easily transportable when not in use.
• antenna has a natural adaptation around the central frequency of operation but not on the entire UHF band for the two values of ⁇ .
• the isolation difference for the two values of ⁇ is proportional to the correlation of the antenna system diagrams. This makes it possible, depending on the frequency channel used, to adjust the insulation and thus to improve the desired effect by using diversity.
• the adaptation circuit here makes it possible to widen the adaptation bandwidth considered for a level of S11 to -6 dB, which is a value that is typical for the intended application.
• the note regarding the isolation of Figure 13 also applies here.
• Figure 15 shows the system performance curves while Figure 16 shows the gain curves for the two antennas of the antenna system described above.
• the performance of the antenna system is greater than 60% over almost the entire UHF band, which reflects a good performance for the intended application.
• An average gain around O. ⁇ dBi over the entire UHF band corresponds to a directivity of 3dBi for this type of antenna with a yield of 60%.
• the first arm or common arm 30 has a shape substantially elliptical with a main axis x, x. Near one end of the main axis x, x are mounted around two distinct axes 33, 34 the two second arms 31, 32 of the two dipole type antennas. These two arms have the shape of a half ellipse.
• the two arms 31, 32 are rotatably mounted so as to be able to fold respectively on the upper face and the lower face of the common arm 30.
• FIG. 18 gives the curves of FIG. adaptation and isolation of such an antenna.
• the characteristics used for the simulation are as follows: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the two axes of the ellipse for the elements 30, 31 and 32 have dimensions, respectively 25mm and 50mm, 3) the thickness of the housing is 12mm, which allows to insert the electronic card thickness of 10mm.
• FIGS. 19 and 20 of other embodiments of an antenna system of the same type as that shown in FIG. 9.
• the diversity antenna system according to the present invention has a first common arm 40 having an oblong housing shape. At the end of the housing 40 are provided two separate axes 43, 44 on which are mounted respectively a first second arm 41 and a second second arm 42 to obtain the two dipole type antennas forming the antenna system according to the invention . These arms 41 and 42 of oblong shape can rotate about the axes 43 and 44 and fall back on the lateral sides of the first common arm 40 forming a housing.
• Figure 20 there is shown another alternative embodiment of an antenna system according to the present invention. In this case, the system comprises a first common arm 50. This arm has a shape identical to the first arm 30 of the embodiment of FIG. 9.
• first second arm 51 has a part that can be folded down on the side face of the first arm 50.
• This portion 51 is extended perpendicularly by a rectangular member 51 'to fall back under the arm 50 while the second second arm 52 has a main portion 52 can be folded on the another side face of the element 50, this portion 52 extending by a rectangular portion 52 'perpendicular which is folded down on the upper part of the element 50.
• This electronic card schematically comprises a first amplifier LNA (Low Noise Amplifier or "Low Noise Amplifier”) 100 connected in 1A to one of the antennas of the antenna system according to the present invention.
• the LNA amplifier 100 is connected to a tuner 101 itself connected to a demodulator 102.
• the card comprises a second LNA amplifier 110 connected at 1 B to the second antenna.
• the LNA 110 is connected to a tuner 111 connected to a demodulator 112.
• the two demodulators 102 and 112 are interconnected so as to have a master demodulator, namely 112 in the embodiment shown and a slave demodulator, namely 102 in the embodiment shown.
• the output of the master demodulator 112 is connected to a USB interface 120, itself connected to a USB connector 130 for connecting the antenna system to the USB port of a portable terminal such as a laptop or PC or any another device of the same type.
• the carrier includes a box-like member 210 for receiving the common arm 10 of the antenna system of the present invention.
• the element 110 comprises an upper opening 211 adapted to receive said arm and a lower opening allowing the connecting to a connector on the portable device such as a USB connector.
• the element 210 is rotatably mounted about the axis 212 on a fixing means 200 for fixing the antenna support to a device, more particularly on the screen 300 of a laptop.
• the attachment means 200 comprises an L-shaped member 201 on which the box-shaped member 210 is mounted.
• the perpendicular portion of the L-shaped member has an opening 202 forming a slider.
• a second element 203 L In this slide is inserted a second element 203 L, the two elements L 202 and 203 forming clamp on the screen 300.
• the element 203 is provided on its part fitting into the slide of a oblong hole not shown. Once in position, the spacing between the element 203 and the element 201 is maintained by a clamping means 204 such as a clamping screw or the like.
• a clamping means 204 such as a clamping screw or the like.
• the free portion of the second L-shaped member is curved inward, reinforcing the pincer effect.
• a first adjustment makes it possible to tighten the support on the edge of the screen so as to fit on any type of screen.
• a second adjustment can be made by rotating the element 210 receiving the antenna system around the axis 212 to orient the antennas so as to optimize the quality reception for a given channel.

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

Applications Claiming Priority (2)

Publications (2)

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• 2005
  • 2005-08-01 FR FR0552401A patent/FR2889362B1/fr not_active Expired - Fee Related
• 2006
  • 2006-07-19 WO PCT/EP2006/064415 patent/WO2007014855A1/fr active Application Filing
  • 2006-07-19 JP JP2008524475A patent/JP4864086B2/ja active Active
  • 2006-07-19 EP EP06764216A patent/EP1911120B1/de active Active
  • 2006-07-19 CN CN2006800283466A patent/CN101263631B/zh active Active
  • 2006-07-19 KR KR1020087002260A patent/KR101274170B1/ko active IP Right Grant
  • 2006-07-19 US US11/989,887 patent/US8310405B2/en active Active

Non-Patent Citations (1)

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