Classifications

• • 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
  • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
  • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
  • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
• • 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
• • 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
  • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas

Definitions

• the present invention relates to a thin plate antenna.
• Plate antennas of the PIFA or other type are now commonly used in particular for the production of portable radiotelephones. Indeed, these antennas are entirely internal to the housing of the portable telephone and they have relatively reduced dimensions.
• FIG. 1 there is shown in vertical section in a simplified manner such an antenna. It consists of a radiant element 10 whose design is adapted to the wavelength or wavelengths in which one wants to work as well as to the desired impedance which is typically 50 ⁇ .
• This antenna also includes a ground plane 12 substantially parallel to the radiant element 10.
• a short circuit 14 is produced between the radiant element 10 and the ground plane 12.
• the power supply to the antenna is constituted by more often by a coaxial cable 16 whose central conductor 16a is electrically connected to the radiant element 10 and whose shield 16b is connected to the ground plane.
• the minimum spacing e is of the order of 7 to 10 mm when the dielectric between the radiant element and the ground plane is air and the frequency is less than 2 GHz.
• the antenna obtained has limitations in its operation and in particular limitations as to its bandwidth which are unacceptable.
• a distance e of less than 5 mm is difficult to obtain for frequencies below 2 GHz, that is to say for frequency ranges usually used in radiotelephony, in particular in GSM.
• an evolution of portable radiotelephones takes shape according to which the total thickness of the radiotelephone must become increasingly reduced. It is therefore desirable to be able to have antennas also of reduced thickness and in which, in particular, the distance e is significantly less than 7 mm, for example of the order of 2 to 3 mm. It should also be noted that to save space in the radiotelephone, often metallization on the PCB, shields, etc. constitute the ground plane of the radiotelephone and the assembly formed by the radiant element, the short circuit 14 and the power cable 16 is directly mounted on the printed circuit.
• antennas the total thickness of which is at most equal to 5 mm while presenting acceptable operating conditions and capable of working in several frequency bands corresponding to those conventionally used in radiotelephones Modems including laptop, PCMCIA card, PDA, etc.
• the conductive surface is constituted by a conductive plate and the antenna further comprises an insulating mechanical structure on which are fixed the radiant element, the conductive plate and the conductive connection.
• FIG. 2A is a top view of the conductive surface of a first embodiment of an antenna according to the invention.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Waveguide Aerials (AREA)
• Details Of Aerials (AREA)
• Support Of Aerials (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=30011506

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (4)

• 2002
  • 2002-07-26 FR FR0209488A patent/FR2842951A1/fr active Pending
• 2003
  • 2003-07-25 WO PCT/FR2003/002349 patent/WO2004012298A2/fr not_active Ceased
  • 2003-07-25 JP JP2004523881A patent/JP2005534242A/ja active Pending
  • 2003-07-25 CN CN 03817958 patent/CN1672289A/zh active Pending
  • 2003-07-25 AU AU2003269057A patent/AU2003269057A1/en not_active Abandoned
  • 2003-07-25 EP EP03750843A patent/EP1525641A2/de not_active Withdrawn

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