Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0471—Non-planar, stepped or wedge-shaped patch
• • 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
  • 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
  • H01Q1/12—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
  • H01Q1/245—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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• • 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
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
• • 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
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means

Definitions

• the present invention relates to plate type antennas in particular but not exclusively usable in portable radiotelephones.
• radiotelephone antenna In the vast majority of known radiotelephones, the antenna is external and therefore increases the size of the device. Another problem related to the design of radiotelephones lies in the fact that currently two frequency bands are used in portable radiotelephone networks. On the one hand, there is the so-called GSM band which corresponds to a frequency band going from 890 MHz to 960 MHz and the frequency band called DCS 1800 whose frequency band goes from 1,710 MHz to 1,880 MHz.
• radiotelephones which can operate in one and the other of the frequency bands depending on the network used.
• a plate type antenna has already been proposed in a radiotelephone. This antenna can be placed inside the radiotelephone itself and this therefore considerably reduces the space requirement. However, in this known solution, the plate antenna can only operate for a single frequency band.
• the internal antenna element for a portable device of the plate type is characterized in that it comprises:
• a body of dielectric material having a lower face, an upper face and four lateral faces, a conductive plate covering said upper face,
• a conductive plate covering one of the lateral faces, electrically connected along its upper edge to an edge of said plate and provided with electrical connection means extending along a second edge parallel to the first edge and intended to connect said conductive plate to a ground plane intended to be arranged along the underside of said electrical body, the other three lateral faces being devoid of metallization,
• the invention also relates to an internal antenna of the plate type for a portable device which is characterized in that it comprises an antenna element of the type defined above, a conductive plate constituting the ground plane and a power supply whose hot point is connected to said wafer and whose ground of the power supply is connected to the conductive plate forming the ground plane of the antenna.
• the conductive plate and the conductive plate covering one of the lateral faces of the dielectric belong to the antenna element as well as the conductive plate constituting the ground plane consist of the same folded metal sheet and fixed to the body of dielectric material.
• the portion of said metal sheet forming the ground plane comprises a first opening surrounded by an electrical connection flange protruding from said sheet and constituting an extension of said sheet, and the hot spot consists of a conductive element passing through the body of dielectric material and a first end of which is electrically connected to said wafer and the second end of which projects into the face of the dielectric material inside said flange.
• the collar and the second end of the conductive element forming antenna connection elements directly capable of cooperating with a base provided on the printed circuit of the portable device equipped with this antenna.
• the portable device which is equipped with its internal plate antenna must be able to operate with an external antenna, for example, that of a motor vehicle.
• the internal antenna must then be disconnected from the antenna circuits of the portable device and the external antenna must be connected to the antenna circuits of this device.
• the antenna is characterized in that the portion of said metal sheet forming said wafer has a second opening opposite said first opening, in that the first end of said conductive element protrudes from the upper face of said body of dielectric material and in that said body has a recess surrounding said conductive element, in that said sheet has a second elastically deformable extension surrounding said second opening, the end of which free protrudes into said recess and is applied elastically against said conductive element.
• the second elastically deformable extension constitutes an electrical switching member.
• the conductive element At rest, corresponding to the operation of the device with the internal antenna, the conductive element is electrically connected to the conductive plate forming the radiating plate of the plate antenna via the switching element. On the contrary, when the external antenna connector is connected, this connector discards the second extension of the conductive element forming the switching element, which therefore disconnects the internal antenna.
• the invention also relates to the application of an internal antenna of the plate type for a portable device of the type defined above to the production of a portable radiotelephone which is characterized in that the conductive plate forming the ground plane is constituted by the ground plate of the radiotelephone circuits.
• this conductive plate is interposed between the printed circuit of the radiotelephone and the antenna element by which said conductive plate forms a reflective plane for the antenna thus forming a directivity and therefore a protection against electromagnetic radiation for the 'user.
• FIG. 1 is a perspective view showing the principle of embodiment of the plate antenna
• Figure 2 is a detail view showing a first embodiment of the antenna capacity
• Figure 2a shows an alternative embodiment of the capacity
• Figure 3 is a perspective view showing a method of mounting the antenna element on the ground plane
• Figure 4 is a schematic view in vertical section of a plate antenna equipped with an antenna connector
• Figure 5 is a schematic vertical sectional view of a plate antenna fitted with an antenna connector and an external antenna switch
• Figures 6a and 6b show a preferred embodiment of the antenna schematically shown in Figure 5
• Figure 7 is a schematic view showing the installation of an antenna in a radiotelephone.
• the antenna comprises a block 10 of dielectric material which has an upper face 12, a lower face 14 and four parallel side faces two by two respectively the faces 16 and 18 and the faces 20 and 22.
• the upper face 12 of the dielectric block 10 is covered by a conductive metallization layer 24 which thus forms a conductive plate and the lower face 14 also rests on a conductive plate 26 forming the ground plane.
• the face 18 is also covered by a metallization 28 electrically connected to the ground plane 26 and to the conductive plate 24 thus forming a short circuit.
• the lateral faces 20, 22 and 16 are devoid of metallization.
• the antenna also includes a probe 30 or supply conductor which comprises a hot spot 32 connected to the conductive plate 24 and a mass connected to the ground plane 26.
• the supply conductor is in the form of a coaxial conductor but other embodiments could be envisaged.
• the antenna feed 30 is arranged near the edge 18 provided with the short circuit 28 and the side face 22.
• the antenna also has a capacity symbolically represented by 34 which electrically connects the ground plane 26 and the conductive plate 24.
• this capacitor 34 is disposed near the side face 20 and the side face 16. In other words, it can be said that the capacitor 34 is diagonally opposite to the antenna feed 30.
• the plate antenna thus formed allows operation in two frequency bands which are respectively defined by the radiating slots formed by the side faces 20 and 22 and on the other hand by the side face 16 opposite the short circuit 28. If we call L the length of the faces 20 and 22 and L ′ the length of the face 16 opposite the short-circuit, we understand that the radiating slit 16 corresponds to a frequency band of which a quarter of the wavelength is substantially equal to L and that the slots 20 and 22 allow operation in a frequency band whose half wavelength is substantially equal to the length L '.
• a usable material is a ceramic.
• the lengths L and L ′ may be equal to 3 cm.
• the height h of the radiating slot 16 is equal to 5 mm and the height h 'of the short circuit is equal to 2 mm.
• the conductive plate 24 and the short-circuit 18 can be produced either effectively by conductive plates fixed on the corresponding faces of the dielectric block 10, or by metallizations produced on these faces.
• the ground plane 26 is constituted by a conductive plate.
• an antenna element constituted by the dielectric body and its metallizations 24 and 28 and its capacitance 34 which forms an autonomous component. Just attach it to the base plate to form a plate antenna.
• This consists of an extension 36 of the conductive plate 24, this extension has a curved portion 38 which is therefore parallel to the face 20 of the dielectric block.
• the curved end 38 is spaced from the face 20 and stops above the ground plate 26 and ends in a portion 39 folded towards the side face of the block 10 of dielectric material.
• the capacitor 34 could consist of a conventional capacitor electrically connected to the conductive plate 24 and to the ground plane 26.
• FIG. 2a illustrates another embodiment of the capacity 34 which, in this case, is adjustable.
• the capacitor consists of a piece of coaxial cable 35 comprising an axial conductor 37 and a cylindrical conductor 39.
• the cylindrical conductor 39 is electrically connected to the plate 24, while the end of the axial conductor 37 is connected to the ground plane 26 by a conductive wire 41.
• the antenna When the antenna is mounted in a radiotelephone, it may be advantageous to use the ground plate of the electronic circuits of the radiotelephone as the ground plane of the antenna.
• the antenna itself will result from the union of an antenna element 50 shown in FIG. 3 fixed on a ground conductive plate 52.
• the antenna element 50 comprises the dielectric block 10 already described, the conductive plate 24 and the short circuit 28.
• FIG. 7 schematically illustrates the mounting of an antenna in a radiotelephone 60.
• the housing 62 with its microphone 64 and its earphone 66.
• the keyboard 68 of the radiotelephone As well as its display 69.
• the ground plate 70 of the electronic circuits 72 of the radiotelephone and the battery 74 has been made visible.
• the antenna element 50 shown in the Figure 3.
• the arrangement of the antenna element is particularly advantageous since it is of reduced size, that it can use the ground plate of the radiotelephone circuit as the antenna ground plane and that moreover the antenna 50 which includes the ground plane 70 is arranged relative to the conductive plate 70 so that the latter constitutes a reflective plane for the antenna which thus ensures the directivity of the ray electromagnetic radiation emitted by the antenna and thus protects the user of the antenna.
• the antenna 80 comprises a body of dielectric material 81 of the same kind as that which is represented in FIGS. 1 to 3, a radiating upper plate 82, a ground plane 84 and a short-circuit plate 86 connecting the plate 82 and the plate 84.
• the short-circuit plate 86 occupies only one of the four lateral faces of the body of dielectric material 81.
• the antenna has a capacitance 34 not shown as already mentioned Explain.
• the radiating plate 82, the base plate 84 and the short circuit 86 are constituted by the same conductive sheet 88 which is folded and fixed on the corresponding faces of the body of dielectric material 81.
• the portion of the sheet constituting the base plate 84 is machined to define an opening 90 and an extension forming an electrical connection flange 92.
• the axial antenna conductor 94 is constituted by a conductive rod, a first of which end 94a is electrically connected to the plate 82 and the second end of which 94b projects from the underside of the body 81 inside the volume defined by the flange 92.
• the printed circuit 96 is also shown. the portable device equipped with the antenna 80.
• the base 98 for connection between the internal antenna 80 and the circuits of the portable device has been shown. It is understood that, to mount the antenna and connect it, it suffices to engage the base 98 inside the flange 92 in order to ensure the connection of the antenna and the printed circuit 96.
• the extension 92 may be formed by a part of the deformed metal sheet or be formed by an insert welded to the metal sheet 88 around the opening 90.
• Figure 5 shows the block diagram of this antenna.
• the body of dielectric material 81 and the metal sheet 88 which constitutes the radiating upper plate 82, the short-circuit plate 86 and the ground plane 84.
• a recess 100 surrounds part of the conductive rod 94 ′ and this protrudes by its second end 94'a from the upper face of the dielectric body 81.
• Machining is carried out in the upper plate 82 to form a second opening 102 in which protrudes the end 94'a of the rod and to form folded elastic tabs 104, the free end 104a of which is pressed against the rod 94 ".
• a second conductive flange 106 is fixed to the plate head 82 and protrudes from it to define an electrical connection flange for an external antenna 108. As can be seen in FIG. 5, the end 94'a of the rod 94 'protrudes inside the second flange 106.
• the conductive tongues 104 are applied against the rod 94 ′ and the end 94 ′ a of this is therefore connected to the radiating plate. 82.
• the same electrical configuration is thus reconstituted as that shown in FIG. 4.
• the insulating part 110 of the latter separates the elastic conducting tabs 104 thus interrupting the electrical connection between the wafer 82 and the rod 94 '.
• the ground of the antenna is connected to the ground of the printed circuit via the flanges 106 and 92 and the axial conductor of the antenna 108 is connected to the rod 94 '.
• the elastic conductive tabs 104 constitute an electrical switch which, at rest, allows the operation of the portable device with the internal antenna 80 'and which, when the external antenna connector is engaged, ensures the connection between the external antenna and circuits 96 of the portable device.
• the recess 100 In order to further improve the functioning of the antenna, in particular the functioning of the external antenna when the latter is connected to the plate antenna, it is preferable for the recess 100 to pass through the dielectric body than right through in such a way that when the antenna connector 108 is mounted, the external conductor of the latter is electrically connected to the external base conductor 98.
• the cylindrical electric conductor which surrounds the axial conductor 94 eliminates or considerably reduces the risks the plate antenna is not excited by the external antenna while in operation.
• FIGS. 6a and 6b a preferred embodiment of the antenna shown schematically in FIG. 5 will be described in more detail.
• the body of dielectric material 81 has a recess 100 'which passes right through it between the plate 82 and the ground plane 84.
• the ground plane 84 has an extension 92 in the form of a collar which constitutes the external connection for the base 98 fixed to the printed circuit 96.
• the base 98 is constituted by an axial conductor 110 which passes through the recess 100 'and which projects from the plate 82, and by an external conductor 112.
• the plate 82 in line with the recess 100 ' has an elastically deformable extension 114 of generally frustoconical shape. At rest, that is to say when the external antenna is not connected, the free edge 116 of the extension 114 is in electrical contact with the end 110a of the axial conductor 110. An electrical connection is thus established between the antenna plate 82 and the printed circuit 96. 10

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

Applications Claiming Priority (5)

Publications (1)

Family

ID=26234309

Family Applications (1)

Country Status (8)

Families Citing this family (29)

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• 1999
  • 1999-03-11 FR FR9902989A patent/FR2778500B1/fr not_active Expired - Fee Related
  • 1999-05-04 KR KR1019997012495A patent/KR20010014344A/ko not_active Application Discontinuation
  • 1999-05-04 EP EP99916981A patent/EP0995234A1/de not_active Withdrawn
  • 1999-05-04 WO PCT/FR1999/001051 patent/WO1999057785A1/fr not_active Application Discontinuation
  • 1999-05-04 US US09/446,901 patent/US6326919B1/en not_active Expired - Fee Related
  • 1999-05-04 JP JP55500599A patent/JP2002509681A/ja active Pending
  • 1999-05-04 CN CN99800670A patent/CN1129200C/zh not_active Expired - Fee Related
  • 1999-05-11 TW TW088107224A patent/TW424350B/zh not_active IP Right Cessation

Non-Patent Citations (1)

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