WO2003096474A1 - Antenne commutable a bandes de frequence multiples pour terminaux portatifs - Google Patents

Antenne commutable a bandes de frequence multiples pour terminaux portatifs Download PDF

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Publication number
WO2003096474A1
WO2003096474A1 PCT/EP2003/004643 EP0304643W WO03096474A1 WO 2003096474 A1 WO2003096474 A1 WO 2003096474A1 EP 0304643 W EP0304643 W EP 0304643W WO 03096474 A1 WO03096474 A1 WO 03096474A1
Authority
WO
WIPO (PCT)
Prior art keywords
impedance
antenna
switch
ground
radio
Prior art date
Application number
PCT/EP2003/004643
Other languages
English (en)
Inventor
Zhinong Ying
Original Assignee
Sony Ericsson Mobile Communications Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP02445056A external-priority patent/EP1361623B1/fr
Application filed by Sony Ericsson Mobile Communications Ab filed Critical Sony Ericsson Mobile Communications Ab
Priority to AU2003227707A priority Critical patent/AU2003227707A1/en
Publication of WO2003096474A1 publication Critical patent/WO2003096474A1/fr

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Classifications

    • 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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • 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
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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

Definitions

  • the present invention relates generally to antennas for radio communication terminals and, in particular, to low-profile antennas devised to be incorporated into portable terminals, and which are capable of operating at different telecommunication frequency bands.
  • PCNs Personal Communication Networks
  • the Cellular hyperband is assigned two frequency bands (commonly referred to as the A frequency band and the B frequency band) for carrying and controlling communications in the 800 MHZ region.
  • the PCS hyperband is specified in the United States to include six different frequency bands (A, B. C, D, E and F) in the 1900 MHZ region.
  • A, B. C, D, E and F different frequency bands
  • PCS hyperband e.g., PCS 1900 (J-STD-007)
  • Cellular hyperband e.g., D-AMPS (IS- 136)
  • Other frequency bands in which these devices will be operating include GPS (operating in the 1.5 GHz range) and UMTS (operating in the 2.0 GHz range).
  • Each one of the frequency bands specified for the Cellular and PCS hyperbands is allocated a plurality of traffic channels and at least one access or control channel. The control channel is used to control or supervise the operation of mobile stations by means of information transmitted to and received from the mobile stations.
  • Such information may include incoming call signals, outgoing call signals, page signals, page response signals, location registration signals, voice channel assignments, maintenance instructions, hand-off, and cell selection or reselection instructions as a mobile station travels out of the radio coverage of one cell and into the radio coverage of another cell.
  • the control and voice channels may operate using' either analog modulation or digital modulation.
  • the signals transmitted by a base station in the downlink over the traffic and control channels are received by mobile or portable terminals, each of which have at least one antenna.
  • mobile or portable terminals have employed a number of different types of antennas to receive and transmit signals over the air interface. For example, monopole antennas mounted perpendicularly to a conducting surface have been found to provide good radiation characteristics, desirable drive point impedances and relatively simple construction.
  • Monopole antennas can be created in various physical forms. For example, rod or whip antennas have frequently been used in conjunction with portable terminals. For high frequency applications where an antenna's length is to be minimised, another choice is the helical antenna. In addition, mobile terminal manufacturers encounter a constant demand for smaller and smaller te ⁇ ninals. This demand for mimaturisation is combined with desire for additional functionality such as having the ability to use the terminal at different frequency bands and different cellular systems.
  • PLFA planar inverted-F antennas
  • Lai, Kin, Yue, Albert et al has published a meandering inverted-F antenna in WO 96/27219., by which it is possible to reduce the antenna size to about 40% of conventional PIFA antennas. In many applications, multi-band performance is needed.
  • Ying has proposed a printed twin-spiral dual band antenna in US patent No 6,166,694.
  • the disclosure includes a dual-band built-in antenna having two s1rip-line parts which resonant at different frequencies. In that design, the bandwidth of antenna is smaller because thin strip lines are used as radiators.
  • a compensation method is therefore also proposed, i.e. a resistor loading is introduced on the matching bridge, which gives wider bandwidth at the loss of some gain.
  • WO 00/36700 discloses a further improved dual band patch antenna, proposed by Ying. That antenna use the same concept as the printed twin spiral antenna which was stated in US 6,166,694, the antenna havinh two parts which operate in two frequency ranges. Instead of using narrow strip, it uses the patches with slot cutting, the slotted patches are used as radiators, they can offer wider bandwidth. For triple band application, the upper band need the band from 1710 MHz to
  • WO 00/36700 1990 MHz.
  • the solution in WO 00/36700 can not meet the requirement.
  • a semi built-in multi-band printed patch antenna was proposed by Ying in WO 01/17063. That design needs larger surface area to realise triple band antenna.
  • Ying has proposed a compact multi-band branch printed antenna.
  • the antenna can cover tri-band by using a parasitic metal element. In order to be able to have double-band performance in two telecommunication systems having different frequency bands, it must be possible to operate at four different bands.
  • GSM800 (824MHz-894MHz) in America
  • GSM900 (880-960MHz) in Europe
  • GSM1800 (1710- 1880MHz) in Europe
  • GSM1900 (1850-1990MHz) in America. Consequently, there is a general need four communication terminals, and antennas therefor, capable of quad-band operation.
  • an object of the present invention to overcome the deficiencies related to the prior art. More specifically, it is an object to provide an antenna for radio communication which is capable of operating in different dual-band radio communication systems, where the dual-band frequencies are different in such different communication systems.
  • this object is fulfilled by a tuneable radio antenna device for a radio cornmunication terminal, said antenna device comprising a ground substrate, an antenna element, and a ground pole connecting the antenna element to the ground substrate, wherein an impedance switch device is operable to change the impedance of a connection between the antenna element and the ground substrate for tuning the antenna element to different resonance frequencies.
  • the impedance switch device comprises a MEMS switch.
  • said antenna element comprises a first elongated member, and a second elongated member which is shorter than said first member, wherein said impedance switch is operable to switch between a first impedance setting , in which said members are resonant for a first lower and a first higher frequency band, respectively, and a second impedance setting, in which said members are resonant for a second lower and a second higher frequency band, respectively, different from said first lower and a first higher frequency band.
  • said impedance switch device comprises a first switch operable to change the impedance of a first connection between the first member and the ground substrate, and a second switch operable to change the impedance of a second connection between the second member and the ground substrate.
  • Said first switch is preferably devised to optionally set, for said first connection, a first impedance in said first impedance setting or a second impedance in said second impedance setting
  • said second switch is correspondingly devised to optionally set, for said second connection, a third impedance in said first impedance setting or a fourth impedance in said second impedance setting .
  • said antenna element is a branched antenna, wherein said first member is a first branch of the antenna element, and said second member is a second branch of said antenna element, each branch having a first and a second end, wherein said branches are connected to said ground pole at their first ends.
  • Said first switch is preferably devised to connect the second end of said first branch to ground, through said first or second impedance
  • said second switch is preferably devised to connect the second end of said second branch to ground, through said third or fourth impedance.
  • said impedance switch device comprises a single pole double throw micro electromechanical systems switch.
  • Said antenna device is, in a specific embodiment, a low-profile planar inverted-F antenna.
  • said first member of the antenna element is a main radiating element, the first connection forming said ground pole, and said second member is a parasitic element to said antenna element, connectable to ground at one of its ends by said second connection.
  • Said first switch is preferably devised to connect said ground pole to ground, through said first or second impedance
  • said second switch is preferably devised to connect said second connection said parasitic element to ground, through said third or fourth impedance.
  • said impedance switch device comprises a double pole double throw micro electromechanical systems switch.
  • said antenna device is a low-profile planar parasitic inverted-F antenna.
  • the object of the invention is fulfilled by a communication terminal devised for multi-band radio communication, comprising a housing, a user input and output interface, wherein that corrrmunication terminal comprises an antenna device according to the aforementioned first aspect of the invention, and optionally any of the further features of the mentioned embodiments.
  • a tuneable quad-band radio antenna device for a radio communication terminal said .
  • antenna device comprising a ground substrate, a dual-band antenna element comprising a first elongated antenna member, a second elongated antenna ⁇ member, which is shorter than said first member, a ground connection connecting said members to ground, and an impedance switch device operable to change the impedance of said connection for tuning the antenna element, such that in a first impedance setting the antenna element is resonant to a first and a second radio frequency, and in a second impedance setting the antenna element is resonant to a third and a fourth radio frequency which are frequency shifted from said first and second radio frequencies.
  • a communication terminal devised for quad-band radio communication comprising a housing, a user input and output interface, wherein that communication terminal comprises an antenna device according to the aforementioned third aspect.
  • Fig. 1 schematically illustrates a tuneable multi-band radio antenna device according to a first embodiment of the invention
  • Fig. 2 schematically illustrates the feeding and the ground connections of one branch of the embodiment according to Fig. 1 ;
  • Fig. 3 schematically illustrates the impedance switch arrangement at the ground connections of the different branches according to the embodiment of Fig. 1;
  • Fig. 4 schematically illustrates a tuneable multi-band radio antenna device according to a second embodiment of the invention
  • Fig. 5 schematically illustrates the feeding and the ground connection of the main radiating element of the embodiment according to Fig. 2;
  • Fig. 6 schematically illustrates the impedance switch arrangement at the ground connections of the main radiating element and the parasitic according to the embodiment of Fig. 4;
  • Fig. 7 schematically illustrates an exemplary communication terminal implementing an antenna design according to an embodiment of the invention
  • Fig. 8 illustrates a simulation result of the return loss for a specific embodiment in accordance with Fig. 1;
  • Fig. 9 illustrates a simulation result of the return loss for a specific embodiment in accordance with Fig. 4.
  • radio terminals refers to radio terminals as a device in which to implement a radio antenna design according to the present invention.
  • the term radio terminal includes all mobile equipment devised for radio communication with a radio station, which radio station also may be mobile terminal or e.g. a stationary base station. Consequently, the term radio terminal includes mobile telephones, pagers, communicators, electronic organisers, smartphones, PDA:s (Personal Digital Assistants), vehicule-mounted radio communication devices, or the like, as well as portable laptop computers devised for wireless communication in e.g. a WLAN (Wireless Local Area Network).
  • the term radio terminal should also be understood as to include any stationary device arranged for radio communication, such as e.g.
  • the present invention is described herein with reference mainly to two exemplary embodiments, both relating to cellular mobile phones. Both examples relates to planar inverted F antennas for built-in use. However, from the instant description a person skilled in the art will realise that, although not shown, the invention as claimed is equally applicable to other types of antennas for radio cornmunication purposes, such as e.g. stub antennas or micro-strips.
  • Figure 1 discloses schematically a first embodiment of the invention.
  • the embodiment of figure 1 discloses a PIFA devised according to the invention. This kind of antenna has a feeding pin 5 and a ground pole 6, contacting the antenna to the ground plane to of the printed circuit board PCB 2.
  • the specific embodiment of figure 1 is a dual-band branched antenna, having a first elongated member 3 resonant to a first radio frequency, and a second elongated member 4, which is shorter than the first member 3.
  • the second member 4 is resonant to a second radio frequency, higher than the first radio frequency. Without reference to the specific size and form of the antenna, this is a well-known design for a dual-band radio antenna. If the desire is to use the antenna device 1 for four-band appUcation, this kind of antenna cannot be directly used.
  • Four-band application is desirable to make the radio terminal adapted to different dual-band systems having different pairs of resonant frequencies.
  • One example of were a four-band coverage wound be desirable, is for a terminal capable of dual band application in the GSM systems of both Europe and the USA.
  • the geometry of the antenna device 1 disclosed in figure 1 is a branch PLFA antenna.
  • the long branch 3 operates at GSM 900, whereas the short branch 4 operates at GSM 1800, which means that the antenna is tuned to Europe mode.
  • Ground pole 6 connects the first member 3 to ground at a first end 7, from which member 3 extends in an elongated shape to a second end 9.
  • member 4 extends from a first end 8 at the ground connection of the ground pole 6 to a second end 10.
  • each reactance loading 21 , 22 has an adaptive impedance which contributes to the resonance frequency of the respective branch.
  • each reactance loading comprises an impedance switch 21,22 capable of shifting the impedance through the connections 11,12.
  • the impedance switches 21,22 are in one embodiment operated separately, but are in a preferred embodiment operated as one impedance switch device 20, indicated in the drawing by the dashed line.
  • Figure 2 illustrates the principle for the frequency tuning by impedance shifting for the first branch member 3.
  • the reactance loading of the impedance switch 21 is optionally set to a first impedance value Zl or a second impedance value Z2.
  • the resonance frequency for antenna member 3 is adapted to a resonance of 900 MHz to cover Europe mode.
  • the switch 21 is shifted such that connection 11 connects antenna member 3 to ground 2 through the second ⁇ npedance Z2, the resonance frequency is decreased such that it covers 800 MHz for the American mode.
  • Figure 3 corresponds to figure 2, but illustrates the impedance switches 21,22 for both branches 3,4.
  • figure 3 illustrates that the impedance switch 22 for branch 4 comprises a third impedance Z3 and a forth impedance Z4, through either of which connection 12 may connect antenna member 4 to ground 2.
  • Antenna member 4 is preferably, as mentioned earlier, the branch adapted for the higher frequency in a dual-band system.
  • switch 22 connects ground 2 to Z3
  • the resonance frequency of antenna member 4 will be set to 1800 MHz to cover Europe mode.
  • connection 12 such that antenna member 4 connects to ground 2 through impedance Z4
  • the resonance frequency of branch 4 is switched to 1900 MHz to cover the American mode.
  • a SPDT (single pole double throw) MEMS (micro electro-mechanical systems) switch is used in the impedance switches 21,22.
  • the use of a MEMS switch for this purpose is advantageous since it has low insertion loss and low power consumption.
  • the MEMS switch since the MEMS switch is mechanical it does not consume any power when it is not used, since no current passes through it, which makes it ideal for mobile phone application.
  • SPDT switches are otherwise known in the art for the purpose of switching between receive or transmit, as disclosed for instance by Schultz et al. in US 4,803,447.
  • the switch is not only controlled by the MEMS, but rather comprised therein. By applying different levels of voltage to the MEMS, different impedances are thereby obtained through the switch.
  • FIG. 8 shows a diagram of the return loss, as obtained through the simulation measurements.
  • the impedance switch device 20 is in its first setting, such that switch 21 provides an impedance Zl for connection 11 and switch 22 provides an impedance Z3 for connection 12, the antenna device 1 is adapted to Europe mode.
  • the simulation result relating to that setting is indicated by numeral 81 and figure 8.
  • the impedance switch device 20 is shifted, such that switch 21 provides impedance Z2 for connection 11 and switch 22 provides impedance Z4 for connection 12, the antenna device 1 is adapted to American mode.
  • the simulation results for American mode are indicated by numeral 80 in figure 8.
  • the dual-band coverage is suitable shifted by the impedance switch device 20, wherein a quad-band antenna device 1 has been obtained.
  • the simulation for which the results are disclosed in Fig. 8 are performed on the antenna alone.
  • a housing or chassis of a communication terminal such as a cellular phone of Fig. 7
  • both curves 80 and 81 will be slightly shifted downwards in frequency.
  • the resonances of the antenna elements will be suitably located at 800 and 1900 MHz or 900 and 1800 MHz, respectively, for America or Europe mode.
  • the antenna device 101 comprises a first elongated antenna member 30, connected to ground 20 through a ground pole 60, and fed through a connection 50.
  • the first antenna member 30 extends in an elongated manner from a first end 70 at the ground connection 60 to a second end 90, and the length of member 30 is selected such that it is resonant to a first radio frequency.
  • a second antenna member 40 is implemented in the form of a parasitic element, connected to ground at a connection 120 at a first end 80 of the parasitic element.
  • the parasitic 40 extends from the first end 80 in an elongated manner to a second end 100, and the length of the parasitic 40 is shorter than the length of the first antenna member 30, such as the parasitic 40 is resonant to a second and higher radio frequency.
  • This geometry corresponds to a dual-band parasitic antenna, which as such is known in the prior art.
  • the ground connection 60, Or ground pole 60 connects the antenna element 30 to ground 20 through an impedance switch 210,
  • the ground connection 120 of the parasitic 40 is connected to ground 20 through second impedance switch 220.
  • the switches 210,220 may be operated separately, although in one embodiment they are commonly operated in an impedance switch device 200, indicated in the drawing by the dashed line.
  • Figure 5 discloses the basic principal of the impedance switch 210 on the first antenna member 30.
  • the impedance switch 210 is optionally set such that the ground connection 60 connects the antenna member 30 to ground 20 through a first impedance Z10, or such that the connection 60 connects antenna member 30 to ground 20 through a second impedance Z20.
  • the resonance frequency of the antenna element 30 is affected such that it will be resonant for different radio frequency dependent of the impedance setting.
  • Figure 6 illustrates, in a manner similar to figure 3, the arrangement of the impedance switch device 200 for the embodiments disclosed in figure 4. In figure 6, both antenna elements 30 and 40 are showed, and ground connections 60,120 through the respective impedance switches 210,220 to ground 20.
  • the second impedance switch 220 is optionally set to a third impedance Z30 for ground connection 120, or to a forth impedance Z40 for the ground connection 120 between antenna element 40 and ground 20.
  • a DPDT (double pole double throw) MEMS switch is used to control both switches 210,220.
  • the DPTD has low insertion loss and low power consumption, and is therefore advantageous to use for this purpose.
  • the MEMS switch since the MEMS switch is mechanical it does not consume any power when it is not used, as recited above. Also in this case, the switch may be comprised in the MEMS.
  • Figure 9 illustrates simulation results corresponding to those for figure 8, but now for an embodiment as disclosed in figures 4-6. It should be noted that the grading of the horizontal axis is the same as for Fig. 8, i.e. from 0.5 to 2.5 GHz in steps of 0.1 GHz.
  • the GSM system operates at 900 and 1800 MHz, and reference numeral 91 indicates the return loss when the antenna device 101 is tuned to Europe mode by having the.impedance switch device 200 set to impedance Z10 and Z30, respectively.
  • the antenna device 101 When switching the impedance switch device 200 to impedances Z20 and Z40, respectively, the antenna device 101 is tuned to the American mode, wherein the lower frequency is shifted downwards and the higher frequency is shifted upwards to yield the return loss as disclosed by the curve indicated through numeral 90.
  • the antenna When the antenna is enclosed in a housing or chassis of a communication terminal, such as a cellular phone of Fig. 7, both curves 90 and 91 will be slightly shifted downwards in frequency. Thereby the resonances of the antenna elements will be suitably located at 800 and 1900 MHz or 900 and 1800 MHz, respectively, for America or Europe mode.
  • the present invention provides a solution for adapting a dual- band radio antenna into a quad-band radio antenna, by using an impedance switch on the ground connection of the antenna to tune the resonance frequencies.
  • the antenna may have more than two branches.
  • each impedance switch may have more than two selectable settings, e.g. three or four different impedances, for tuning to different frequencies.
  • the embodiments disclosed are selected primarily to provide a simplified yet enabling disclosure of the elected ways of implementing the invention.
  • a suitable field of application is, as previously mentioned, for portable mobile phones in cellular radio communication systems, such as GSM, D-AMPS, UMTS, CDMA2000 etc.
  • Fig. 7 illustrates a communication radio terminal in the embodiment of a cellular mobile phone 300 devised for multi-band radio cornmunication.
  • the terminal 300 comprises a chassis or housing 350, carrying a user audio input in the form of a microphone 310 and a user audio output in the form of a loudspeaker 320 or a connector to an ear piece (not shown).
  • a set of keys, buttons or the like constitutes a data input interface 330 usable e.g. for dialling, according to the established art.
  • a data output interface comprising a display 340 is further included, devised to display communication information, address list etc in a manner well known to the skilled person.
  • the radio communication terminal 300 includes radio transmission and reception electronics (not shown), and is devised with an antenna, such as a built-in antenna device 1 inside the housing 350, which antenna device is indicated in the drawing by the dashed line as an essentially flat object.
  • this antenna device e.g. corresponding to Fig. 1 or Fig. 4, includes a flat ground substrate 2 or 20, an antenna element 3,4 or 30,40 with a radio signal feeding point 5 or 50, a ground pole 6 or 60, and an impedance switch 20 or 200, connecting the antenna element to ground through a selectable impedance in order to tune the antenna to different bands.
  • the other features of the antenna design according to the present invention described above are naturally equally valid for the radio terminal implemented embodiment of Fig. 7.
  • the antenna of the present invention has been discussed primarily as being a radiator, one skilled in the art will appreciate that the antenna of the present invention would also be used as a sensor for receiving information at specific frequencies.
  • the dimensions of the various elements may vary based on the specific application.
  • the impedances of the invention may be capacitive, resistive and/or inductive, highly dependent on the specific design of the antenna elements and the desired resonances.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un dispositif (1) d'antenne radio à bande quad commutable conçu pour un terminal de radiocommunication. Ce dispositif d'antenne comprend un substrat de terre (2), un élément d'antenne à double bande comportant un premier élément d'antenne allongé (3), un second élément d'antenne allongé (4) plus court que le premier élément, et un élément de mise à la terre (11, 12). Un dispositif commutateur d'impédance (20) peut modifier l'impédance de cet élément de mise à la terre (11, 12) de manière à régler l'élément antenne. En effet, dans un premier réglage d'impédance (Z1, Z3), l'élément d'antenne est accordé avec des première et deuxième radiofréquences, et dans un second réglage d'impédance (Z2, Z4), l'élément d'antenne est accordé avec des troisième et quatrième radiofréquences qui sont décalées en fréquence par rapport aux première et seconde radiofréquences.
PCT/EP2003/004643 2002-05-08 2003-05-02 Antenne commutable a bandes de frequence multiples pour terminaux portatifs WO2003096474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003227707A AU2003227707A1 (en) 2002-05-08 2003-05-02 Multiple frequency bands switchable antenna for portable terminals

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02445056.1 2002-05-08
EP02445056A EP1361623B1 (fr) 2002-05-08 2002-05-08 Antenne commutable entre divers bandes de fréquence destinée a des terminaux portatifs
US38226302P 2002-05-21 2002-05-21
US60/382,263 2002-05-21

Publications (1)

Publication Number Publication Date
WO2003096474A1 true WO2003096474A1 (fr) 2003-11-20

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TW (1) TWI275200B (fr)
WO (1) WO2003096474A1 (fr)

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WO2010105272A1 (fr) * 2009-03-13 2010-09-16 Qualcomm Incorporated Antenne multibande à sélectivité de fréquence pour dispositifs de communication sans fil
EP2270925A1 (fr) * 2009-07-03 2011-01-05 Laird Technologies AB Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne
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