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

Definitions

• the present invention relates to an antenna for a radiocommunication terminal.
• One of the non-exclusive fields of application of the invention is that of mobile radiocommunication terminals operating in a radiocommunication system.
• the invention applies in particular, but not exclusively, to a system or network according to the GSM850, GSM900, DCS, PCS and UMTS standards.
• the antennas used in radiocommunication terminals are antennas which must transmit signals in the frequency bands defined in the standards. It is known to use microstrips on a plane as an antenna for communication terminals, these antennas are also called patch antenna and are located inside the terminal housing. They mainly consist of a dielectric base on the surface of which is the plane of the microstrips.
• the radiocommunication terminal comprises a box 2 formed: - of two shells: a so-called rear shell 20 and a so-called front shell 30, - two side walls parallel to the longitudinal axis of the terminal (parallel to the axis XX '): a first wall 21 and a second wall 22, and two walls perpendicular to the axis XX ′, these walls delimiting the rear 20 and front 30 shells of the terminal,
• the housing contains a printed circuit board 70 which extends over most of the interior surface of the terminal and is located approximately in the central part of the terminal between the rear shell 20 and the front shell 30 of the terminal housing.
• the space between the printed circuit board 70 and the rear shell 20 is intended to accommodate on the one hand, the antenna 10, and on the other hand, an energy accumulator.
• the space between the printed circuit board 70 and the front shell 30 is intended to accommodate in particular a display module, of which only the screen 50 has been shown, as well as a module for inputting, comprising in particular the keys of a keyboard 60.
• the various elements, such as the antenna 10, the display screen 50 and the keyboard 60 are connected to the energy accumulator 40 via the printed circuit board 70.
• the shell rear 20 of the housing is split in two: it comprises a hatch 15 covering the antenna 10 and another part covering the energy accumulator 40. As visible in FIGS. 1A and 1B, there are two compartments or spaces contiguous according to the longitudinal axis of the housing, a first space dedicated to the energy accumulator 40, and a second space dedicated to the patch antenna 10
• the energy accumulator 40 has a general dimension smaller than that of the rear shell 20 of the radiocommunication terminal, and a footprint i lower than the volume of the first space dedicated to it. This generates a vacant volume under the rear shell 20 of the terminal next to the energy accumulator 40.
• the energy accumulator 40 comes, for example, to bear on the first wall 21 of the rear shell 20 of the terminal housing and resting on a plastic part 25 occupying the vacant volume, this part 25 itself being supported on the second wall 22 of the rear shell 20 of the terminal housing .
• the hatch 15 makes it possible to isolate the patch antenna 10 from external shocks and dust, As can be seen in FIG. 1A, the antenna 10, located opposite the screen 50, occupies for example approximately the upper third of the terminal, along the longitudinal axis of the housing, and the lower two thirds of the terminal are thus occupied by the energy accumulator 40, located opposite the keyboard 60.
• the dimension of this type of antenna is imposed by the reduced space left available by the arrangement of all the other elements of the terminal, We see that the patch antenna 10 is presented here in the form of a rectangular parallelepiped occupying practically all the space which is dedicated to it, The dimensions of the plan in which the microstrips of the antenna 10 are located, are those of the hatched part 10 of FIG. 1A. It results from the confinement of the antenna in a reduced space a transfer of the electrical energy of the antenna into heat which is propagates in the terminal and causes damage in particular to the printed circuit board 70. In addition, due to the confinement of the antenna, its efficiency is reduced and can drop below 40% and with a bandwidth less than 6, 5% in GSM900.
• the antennas will also have to cover different frequency bands in the near future, such as the GSM850 frequency band between 824 and 894 MHz. Covering other power bands will require increasing the size of the antennas compared to their current size.
• the invention aims to present a solution to these problems and to provide an arrangement allowing the use of a less confined antenna. , more efficient and which can cover, among other things, an additional frequency band different from that covered with current antennas, and without having to increase the dimensions of the box.
• the invention for this purpose, relates to a radiocommunication terminal as defined in claim 1.
• FIG. 1A illustrates a schematic view of a radiocommunication terminal of the prior art, seen from the back and without the rear shell.
• Figure 1B already described, illustrates a schematic view of the radiocommunication terminal in longitudinal section along the axis AA of Figure 1A with the rear shell.
• FIG. 2 illustrates a schematic view of a rear radiocommunication terminal, without the rear shell, according to a first embodiment of the invention
• FIG. 3 illustrates a schematic view of the radiocommunication terminal according to the first embodiment of the invention in longitudinal section along the axis III-III in Figure 2 passing through the central part of the terminal.
• Figure 4 illustrates a schematic view of the radiocommunication terminal according to the first embodiment of the invention in cross section along the axis IV-IV of Figure 3.
• FIG. 5 illustrates a schematic view of a radiocommunication terminal according to a second embodiment in longitudinal section along an axis passing through the center of the terminal.
• FIG. 6 illustrates a schematic view of the radiocommunication terminal according to the second embodiment in cross section along the axis VI-VI of FIG. 5.
• radiocommunication including all types of radio transceivers, such as, for example, a mobile telephone, a paging device or a personal digital assistant (personal digital assistant or PDA in English).
• a radiocommunication terminal can be of the GSM850, GSM900, DCS (Digital Communication System in English), UMTS (Universal Mobile Telecommunications System in English), or a DECT (Digital European Cordless Telecommunications in English) type phone, this terminal can also also integrate GPS (Global Positioning System in English) or Wi-Fi (Wireless Fidelity in English).
• the terminal box of FIG. 2 is formed by two side walls parallel to the direction axis XX ': a first wall 21 and a second wall 22 adoptedand by two walls perpendicular to the direction axis XX' which delimit the two shells front 30 and rear 20 of the terminal.
• Under the rear shell 20 is the antenna 10 and the energy accumulator 40, contiguous to the antenna 10.
• the energy accumulator 40 has an upper surface extending in a plane P. This plane P is parallel to the plane defined by the inner surface of the rear shell 20 of the terminal.
• the energy accumulator 40 supplies electrical energy to the elements of the terminal requiring it for their operation. These elements are, among others, the printed circuit 70, the antenna 10, the display screen 50 and the keyboard 60.
• the energy accumulator 40 occupies a first space, or accumulator space dedicated to it.
• This accumulator space has a general dimension smaller than that of the interior surface of the rear shell 20 of the housing and this generates a vacant space around the energy accumulator 40.
• the vacant space is made up: the space located under the antenna hatch 15 in FIG. 1A of the prior art, that is to say in the upper rear part, for example the rear upper third of the terminal along the longitudinal axis of the housing, and - the space occupied by the plastic part 25 of FIG.
• the energy accumulator 40 has a longitudinal dimension such that it mainly occupies the rear two thirds of the shell of the terminal.
• the accumulator d Energy 40 may be smaller and occupy less than the rear two-thirds of the terminal, in which case, the vacant space would be greater.
• the vacant space will be used, at least partially, in order to increase the space dedicated to the patch antenna 10.
• the antenna space 10 is defined by the vacant space defined above and at least part of the space 26 located above the plane P between the energy accumulator 40 and the rear shell 20 of the terminal.
• the antenna 10 has an inverted L shape with a base 11 and a pole 12.
• the antenna 10 occupies, by its part forming base 1 1, the upper third of the rear shell of the terminal and, by its shaft-forming part 12, for example the lower two-thirds of the rear shell of the terminal between the energy accumulator 40 and the second wall 22,
• the pole part 12 advantageously ensures the function for holding the energy accumulator in place of the part 25 used in the prior art (see FIG. 1A).
• the microstrips of the patch antenna are produced on the plane P between the energy accumulator 40 and the rear shell 20 of the terminal.
• the overall volume of the antenna 10 is therefore greater than that of the prior art. This increases the efficiency of the antenna up to 50-60% in GSM900 mode (required frequency band from 880 to 960MHz depending on the standard). This also makes it possible to obtain a frequency band closer to that required by GSM standards, ie a bandwidth of the order of 7% (for 8.7% required according to the standard) against 6.5% in the prior art. With a larger antenna volume 10, it is easier to make an antenna having different resonant frequencies, for example, when it is desired to integrate GPS or WiFi functions
• the antenna volume between the energy accumulator 40 and the rear shell 20 of the terminal housing can be even greater for a terminal whose shell rear 20 of the housing is slightly curved, as indicated in FIG. 5 and in FIG. 6, To do this, the microstrips of the patch antenna 10 are produced on a surface having a profile complementary to the internal surface of the rear shell, as shown in Figures 5 and 6.
• the projection of the antenna 10 on the printed circuit 70 is greater than for the antennas of the prior art, in particular for the terminal described in FIGS. 2, 3 and 5.
• this projection is increased by the surface 25 covered in the prior art by the plastic part making it possible to hold the accumulator in the terminals in FIG. 1B. This further increases the efficiency of the antenna. It is thus possible to increase the overall volume of the antenna
• the antenna 10 by occupying all the space left vacant next to the energy accumulator 40 and between the energy accumulator 40 and the rear shell 20 of the terminal housing, The antenna 10 will be all the more extended as the The energy accumulator 40 will have a smaller surface area and thickness, which is the current trend.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Support Of Aerials (AREA)
• Telephone Set Structure (AREA)
• Transceivers (AREA)
• Mobile Radio Communication Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34586381

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (19)

• 2003
  • 2003-12-09 FR FR0314379A patent/FR2863406B1/fr not_active Expired - Fee Related
• 2004
  • 2004-12-09 EP EP04816367A patent/EP1695413A2/de not_active Withdrawn
  • 2004-12-09 RU RU2006124535/09A patent/RU2363077C2/ru not_active IP Right Cessation
  • 2004-12-09 WO PCT/FR2004/003177 patent/WO2005057721A2/fr not_active Ceased
  • 2004-12-09 CN CN2004800415038A patent/CN1914764B/zh not_active Expired - Fee Related
  • 2004-12-09 US US10/581,925 patent/US20070281763A1/en not_active Abandoned
  • 2004-12-09 CA CA2548830A patent/CA2548830C/en not_active Expired - Fee Related

Non-Patent Citations (1)

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