EP1555716B1 - Mobile communication terminal - Google Patents
Mobile communication terminal Download PDFInfo
- Publication number
- EP1555716B1 EP1555716B1 EP04773360A EP04773360A EP1555716B1 EP 1555716 B1 EP1555716 B1 EP 1555716B1 EP 04773360 A EP04773360 A EP 04773360A EP 04773360 A EP04773360 A EP 04773360A EP 1555716 B1 EP1555716 B1 EP 1555716B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- casing
- passive antenna
- circuit board
- communication terminal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
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- 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
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- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- 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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present invention relates to a mobile communication terminal, particularly to a mobile communication terminal in which an antenna is installed.
- a mobile phone unit of a folding type in which a casing can be folded.
- the mobile phone unit of a folding type has an antenna.
- an unfavorable effect may be given to characteristics of the antenna.
- US-A-5,572,223 , US-B-6,246,374 and US-A-5,943,021 provide a parasitic element to compensate for changes to antenna characteristics in an open or closed position
- WO-A-02/19671 provides an extendable ground plane to change the antenna characteristics
- the present invention aims to provide the combination of an antenna and a passive element in which characteristics of the antenna are not easily subject to the influence of the length of a circuit board where the antenna and the passive element are disposed.
- a first aspect of the present invention is a mobile communication terminal comprising: a first casing including a power feeding antenna to which power in a communication frequency band used for communication by said mobile communication terminal is supplied, and a second casing connected to said first casing, and characterised by: said second casing including a passive antenna to which power is not supplied and which resonates at approximately the lower limit communication frequency in the communication frequency band.
- a second aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which an electrical length of the passive antenna is a quarter of a wavelength of a radio wave corresponding to the lower limit communication frequency.
- a third aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the first casing and the second casing can be folded to be opposed to each other.
- a fourth aspect of the present invention is the mobile communication terminal according to the third aspect of the present invention, in which the power feeding antenna and the passive antenna are electromagnetically coupled when folded.
- a fifth aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the first casing has a first circuit board connected to the power feeding antenna, the second casing has a second circuit board in which the passive antenna is provided, and power is supplied between the power feeding antenna and a ground potential of the first circuit board.
- a sixth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a circuit pattern provided on the second circuit board.
- a seventh aspect of the present invention is the mobile communication terminal according to the sixth aspect of the present invention, in which the circuit pattern has the shape of meanders.
- An eighth aspect of the present invention is the mobile communication terminal according to the sixth aspect of the present invention, in which the circuit pattern has an approximately straight shape.
- a ninth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a wire provided on the second circuit board.
- a tenth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a metal plate provided on the second circuit board.
- An eleventh aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the second casing has a circuit member which is connected to the passive antenna and the ground potential of the second circuit board and which makes the passive antenna resonate at the lower limit communication frequency.
- the passive antenna is provided as described above, the deterioration of the antenna characteristics can be controlled to prevent the deterioration of the telephone speech quality of the mobile communication terminal.
- FIGS. 1 to 12 the first embodiment of the present invention will be explained with reference to FIGS. 1 to 12 .
- FIGS. 1A and 1B are views showing a mobile phone unit 1 (mobile communication terminal) according to this embodiment; FIG. 1A is a plan view and FIG. 1B is side section view.
- a communication frequency band that the mobile phone 1 uses for communication is predetermined in every system.
- the communication frequency band is from about 0.83GHz to about 0.93GHz, for example.
- the lower limit of the communication frequency band is called fL (the lower limit frequency)
- the upper limit thereof is called fH
- fc the average between the lower limit and upper limit
- the mobile phone unit 1 includes a first casing 10 and a second casing 20. As shown in FIG. 1A , buttons such as a ten-key are provided in the first casing 10. A display is provided in the second casing 20. The first casing 10 and the second casing 20 are connected by a hinge not shown in the figure. The mobile phone unit 1 can be folded by means of this hinge such that the buttons of the first casing 10 and the display of the second casing 20 are opposed to each other. In FIGS. 1A and 1B , the first casing 10 and the second casing 20 are at an angle of almost 45 degrees, and the mobile phone unit 1 is recognized as being open in such state. The angle made by the first casing 10 and the second casing 20 may not almost exist in some cases.
- the first casing 10 has a first circuit board 12 and the second casing 20 has a second circuit board 22.
- the first circuit board 12 and the second circuit board 22 are connected by a circuit board hinge 30. With this, the first circuit board 12 and the second circuit board 22 can change the posture flexibly depending on the folded state of the mobile phone unit 1.
- FIG. 2 is a plan view showing a state of the first circuit board 12, second circuit board 22 and circuit board hinge 30, when the mobile phone unit 1 is fully opened and the first casing 10 and the second casing 20 face almost in the same direction (when opened).
- a GND (ground potential) portion 14 a power feeding antenna 16, a power supply portion 17 and a feed point 18 are provided in the first circuit board 12.
- the GND (ground potential) portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
- the power feeding antenna 16 is an antenna to which high frequency electric power is supplied.
- the power supply portion 17 is connected to the GND portion 14 and the power feeding antenna 16 and supplies the high frequency electric power between the ground portion 14 and the power feeding antenna 16.
- the feed point 18 is a portion at which the power feeding antenna 16 is connected to the first circuit board 12, and the power feeding antenna 16 receives power through the feed point 18.
- a GND (ground potential) portion 24 and a passive antenna 26 are attached to the second circuit board 22.
- the GND (ground potential) portion 24 is a portion keeping the ground potential.
- the portion has almost a rectangular-shaped solid circuit pattern.
- the passive antenna 26 is an antenna to which power is not supplied.
- the passive antenna 26 is connected to the ground portion 24.
- the passive antenna 26 is made to resonate at the lower limit communication frequency fL. Note that the whole length L of the passive antenna 26 may not be ⁇ /4 on condition that the antenna resonates at the lower limit communication frequency.
- the passive antenna 26 can be provided on the second circuit board 22 instead of being attached to the outside of the second circuit board 22.
- the modified examples are shown in FIGS. 3A to 3D .
- the passive antenna 26 may have the circuit pattern of the shape of meanders. As shown in FIG. 3B , the passive antenna 26 may have the circuit pattern of an approximately straight shape in which the long side portion is considerably longer than the short side portion. Further, the passive antenna 26 may not be the circuit pattern and may be a wire as shown in FIG. 3C and may be a metal plate as shown in FIG. 3D .
- the passive antenna 26 is made to resonate at the lower limit communication frequency fL by adjusting the whole length L of the passive antenna 26.
- a circuit chip 25 may be connected to the passive antenna 26 and the GND portion 24 to make the passive antenna 26 resonate at the lower limit communication frequency fL.
- FIGS. 5A and 5B show a state of the first circuit 12, second circuit 22 and circuit board hinge 30, when the mobile phone unit 1 is folded and the first casing 10 and the second casing 20 oppose to each other;
- FIG. 5A is a side view and
- FIG. 5B is a plan view.
- the power feeding antenna 16 opposes to the passive antenna 26. Further, the power feeding antenna 16 is positioned at the back of the passive antenna 26 shown in FIG. 5B , and the power feeding antenna 16 opposes to the passive antenna 26. Accordingly, the power feeding antenna 16 and the passive antenna 26 are electromagnetically coupled.
- FIGS. 6A and 6B show a comparative example to be compared with a practice example of the present invention
- FIG. 6A is a plan view
- FIG. 6B shows the antenna radiation efficiency.
- the comparative example has no passive antenna 26.
- FIG. 8 shows the antenna radiation efficiency of a passive antenna 26 in the communication frequency band, in each of the cases where the resonance frequency thereof is a lower limit fL (lower limit communication frequency), is an upper limit fH and is an average fc of the lower limit and upper limit.
- the antenna radiation efficiency becomes particularly low around the lower limit fL in the communication frequency band, when the resonance frequency of the passive antenna 26 is fH and fc, which is not favorable.
- the antenna radiation efficiency becomes excellent over the whole of the desired band, when the resonance frequency of the passive antenna 26 is fL, which is favorable.
- the passive antenna 26 is provided in the second circuit board 22 and the resonance frequency of the passive antenna 26 is fL, the antenna radiation efficiency becomes excellent over the whole of the desired band and the desirable effectiveness can be obtained.
- FIGS. 10A and 10B directions are defined as shown in FIG. 9 and the antenna radiation pattern in the comparative example is shown in FIGS. 10A and 10B .
- the radiation pattern from the minute current element is a sine curve, and originally, the direction of maximum radiation is the side directions (90°, 270°) and should become symmetrical with the top and bottom (the directions of 0° and 180°).
- the antenna radiation pattern becomes desirable regardless of the whole length H of the circuit board.
- the antenna radiation efficiency when the mobile phone unit 1 is folded is shown in FIG. 12 .
- the antenna radiation efficiency of the practice example 1 according to the present invention is higher than that of the comparative example in the desired band.
- FIGS. 13 to 20 Since the second embodiment is also applied to the folding type mobile phone unit 1 (the mobile communication terminal) similarly to the first embodiment, the same reference numerals are given to the same members as those in the mobile phone unit 1 explained in the first embodiment and the detailed explanation is omitted.
- FIG. 13 is a drawing of a mobile phone unit (mobile communication terminal) 1 according to this embodiment of the present invention and is a plan view showing a state of a first circuit board 12, second circuit board 22 and circuit board hinge 30, when the mobile phone unit 1 is fully opened and a first casing 10 and a second casing 20 face almost in the same direction (when opened).
- a GND (ground potential) portion 14 a power feeding antenna 16, a power supply portion 17 and a feed point 18 are provided in the first circuit board 12.
- the GND (ground potential) portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
- the power feeding antenna 16 is an antenna to which the high frequency electric power is supplied.
- the power supply portion 17 is connected to the ground portion 14 and the power feeding antenna 16 and supplies the high frequency electric power between the power feeding antenna 16 and the GND portion 14.
- the feed point 18 is a portion at which the power feeding antenna 16 is connected to the first circuit board 12, and the power feeding antenna 16 receives power through the feed point 18.
- the second circuit board 22 has a GND (ground potential) portion 24, and a passive antenna 26 is attached to the GND portion 24 through a switch 27.
- GND ground potential
- the GND (ground potential) portion 24 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
- the passive antenna 26 is an antenna to which power is not supplied. The passive antenna 26 is connected to the GND portion 24 through the switch 27.
- the switch 27 is switched between when the mobile phone unit 1 is fully opened and the first casing 10 and the second casing 20 are opened and when the first casing 10 and the second casing 20 are closed, for example.
- the switching of this switch is performed by the control of a control portion (not shown in the figure) which detects the states of the opening and closing of the mobile phone unit 1, for example.
- a switch changed mechanically in accordance with the opening and closing operations of the mobile phone unit 1 may be used.
- the passive antenna 26 may be provided on the second circuit board 22 instead of being attached to the outside of the second circuit board 22 and may have various shapes as shown in FIGS. 3A to 3D , for example.
- circuit components made of chip components and the like may be attached.
- a coil 41a (this coil 41a has the inductance value of 33nH or 30nH, for example) is connected between the GND portion 24 and the passive antenna 26, when the switch 27 is closed. Further, the passive antenna 26 is made not to connect to the coil 41a and the GND portion 24, when the switch is opened.
- a switch connected to the passive antenna 26 is provided as a switch 27' which can be switched from one side to the other side, and a coil 41a is connected between the GND portion 24 and the passive antenna 26 when the switch changes to one side, and a coil 41b is connected between the GND portion 24 and the passive antenna 26 when the switch changes to the other side.
- the coil 41a has the inductance value of 33nH, for example, and the coil 41b has the inductance value of 30nH, for example.
- the inductance components formed of a chip component are used as the coils 41a and 41b.
- FIGS. 15A and 15B and FIGS. 16A and 16B are drawings which show an example of a state of the passive antenna 26 when the mobile phone unit 1 is opened ( FIGS. 15A and 15B ), and show an example of a state of the passive antenna 26 when the mobile phone unit 1 is closed ( FIGS. 16A and 16B ), in the case where the connection configuration shown in FIG. 14A is employed.
- the switch 27 When the mobile phone unit 1 is opened as shown in FIG. 15A , the switch 27 is in an open state as shown in FIG. 15B and the passive antenna 26 is in a state of being separated from the coil 41a and the GND 24 (that is, a state of being separated from the circuit board inside the second casing 20).
- the switch 27 When the mobile phone unit 1 is closed as shown in FIG. 16A , the switch 27 is in a closed state as shown in FIG 16B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41a.
- FIGS. 17A and 17B and FIGS. 18A and 18B are drawings which show an example of a state of the passive antenna 26 when the mobile phone unit 1 is opened ( FIGS. 17A and 17B ), and show an example of a state of the passive antenna 26 when the mobile phone unit 1 is closed ( FIGS. 18A and 18B ), in the case where the connection configuration shown in FIG. 14B is employed.
- the switch 27' When the mobile phone unit 1 is opened as shown in FIG. 17A , the switch 27' is in a state of being connected to one side as shown in FIG. 17B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41a.
- the switch 27' When the mobile phone unit 1 is closed as shown in FIG. 18A , the switch 27' is in a state of being connected to the other side as shown in FIG. 18B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41b.
- the characteristics as the mobile communication terminal becomes excellent, because the electromagnetic coupling e is generated between the antenna 16 on the first casing 10 side and the passive antenna 26 on the second casing 20 side as shown in FIG. 16A or 18A . Further, when the mobile phone unit 1 is opened, the characteristics in the open state can be improved, because the passive antenna 26 is in a state of being separated ( FIGS. 15A and 15B ) or is in another connection state ( FIG. 17A and 17B ).
- FIGS. 19A and 19B are characteristic curves showing an example of the antenna radiation efficiency of a practice example (practice example 2) according to the second embodiment of the present invention.
- FIG. 19A shows an example of the characteristic in the frequency band for the wireless communication when a mobile phone unit 1 is opened
- FIG. 19B shows an example of the characteristic in the frequency band for the wireless communication when a mobile phone unit 1 is closed.
- the characteristics in three states are compared: the state in which the coil with the inductance value a (here, 33nH) is connected between the passive antenna 26 and the GND portion, the state in which the coil with the inductance value b (here, 30nH) is connected between the passive antenna 26 and the GND portion, and the state in which the passive antenna 26 is separated from the GND portion.
- the characteristics obtained in the case of using the inductance value b and in the case of not connecting to the passive antenna are superior to the characteristic obtained in the case of using the inductance value a , in almost all the frequency band for the communication.
- the characteristics obtained in the case of using the inductance value a and in the case of using the inductance value b are superior to the characteristic obtained in the case of not connecting to the passive antenna, in almost all the frequency band for the communication.
- the radiation efficiency shown in FIG. 19 changes depending on various factors regarding a structure such as the size of a circuit board to which an antenna is connected, and the state in which characteristic is more favorable depends on the structure. Also, regarding the inductance values, the values mentioned above are examples.
- the switch 27 or 27' to switch the connection of the passive antenna is provided at the end portion where the GDN portion of the antenna is connected, however the switch may be provided in the middle of the passive antenna and a part of the passive antenna is separated depending on the state of the terminal.
- the antenna characteristic in each state of the mobile phone unit can be improved.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Description
- The present invention relates to a mobile communication terminal, particularly to a mobile communication terminal in which an antenna is installed.
- As a kind of mobile communication terminal, there is a mobile phone unit of a folding type in which a casing can be folded. The mobile phone unit of a folding type has an antenna. When the mobile phone unit of such folding type is folded, an unfavorable effect may be given to characteristics of the antenna.
- Therefore, as shown in Published
Japanese Patent Application No. H10-84406 - Similarly,
US-A-5,572,223 ,US-B-6,246,374 andUS-A-5,943,021 provide a parasitic element to compensate for changes to antenna characteristics in an open or closed position, whilstWO-A-02/19671 - However, in the case where a dipole antenna and a conductor (passive element) are combined as described above, characteristics of the antenna when a mobile phone unit of the folding type is opened may become deteriorated depending on the length of a circuit board in which the dipole antenna and the conductor are disposed.
- Therefore, the present invention aims to provide the combination of an antenna and a passive element in which characteristics of the antenna are not easily subject to the influence of the length of a circuit board where the antenna and the passive element are disposed.
- A first aspect of the present invention is a mobile communication terminal comprising: a first casing including a power feeding antenna to which power in a communication frequency band used for communication by said mobile communication terminal is supplied, and a second casing connected to said first casing, and characterised by: said second casing including a passive antenna to which power is not supplied and which resonates at approximately the lower limit communication frequency in the communication frequency band.
- A second aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which an electrical length of the passive antenna is a quarter of a wavelength of a radio wave corresponding to the lower limit communication frequency.
- A third aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the first casing and the second casing can be folded to be opposed to each other.
- A fourth aspect of the present invention is the mobile communication terminal according to the third aspect of the present invention, in which the power feeding antenna and the passive antenna are electromagnetically coupled when folded.
- A fifth aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the first casing has a first circuit board connected to the power feeding antenna, the second casing has a second circuit board in which the passive antenna is provided, and power is supplied between the power feeding antenna and a ground potential of the first circuit board.
- A sixth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a circuit pattern provided on the second circuit board.
- A seventh aspect of the present invention is the mobile communication terminal according to the sixth aspect of the present invention, in which the circuit pattern has the shape of meanders.
- An eighth aspect of the present invention is the mobile communication terminal according to the sixth aspect of the present invention, in which the circuit pattern has an approximately straight shape.
- A ninth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a wire provided on the second circuit board.
- A tenth aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the passive antenna has a metal plate provided on the second circuit board.
- An eleventh aspect of the present invention is the mobile communication terminal according to the fifth aspect of the present invention, in which the second casing has a circuit member which is connected to the passive antenna and the ground potential of the second circuit board and which makes the passive antenna resonate at the lower limit communication frequency.
- Accordingly, since the passive antenna is provided as described above, the deterioration of the antenna characteristics can be controlled to prevent the deterioration of the telephone speech quality of the mobile communication terminal.
-
-
FIGS. 1A and 1B are views showing an example of a mobile phone unit (mobile communication terminal) according to a first embodiment of the present invention, in whichFIG. 1A is a plan view andFIG. 1B is a side section view; -
FIG. 2 is a plan view showing an example of a state of a first circuit board, a second circuit board and a hinge used for the circuit boards, when a mobile phone unit according to the first embodiment of the present invention is fully opened; -
FIGS. 3A to 3D are perspective views showing examples of a structure of a passive antenna; -
FIG. 4 is a perspective view showing a modified example in which a circuit chip is connected between a passive antenna and a GND portion of a mobile phone unit according to the first embodiment of the present invention; -
FIGS. 5A and 5B are views showing an example of a state of the first circuit, the second circuit and the hinge used for the circuit boards, when the mobile phone unit according to the first embodiment of the present invention is folded, in whichFIG. 5A is a side view andFIG. 5B is a plan view; -
FIGS. 6A and 6B show a comparative example, in whichFIG. 6A is a plan view, andFIG. 6B is a characteristic curve of the antenna radiation efficiency; -
FIGS. 7A and 7B are characteristic curves, in whichFIG. 7A shows an example of the antenna radiation efficiency in a comparative example (H=165mm), andFIG. 7B shows an example of the antenna radiation efficiency according to the first embodiment of the present invention (H=165mm); -
FIG. 8 is a characteristic curve showing examples of the antenna radiation efficiency, when the resonance frequency of the passive antenna according to the first embodiment of the present invention is a lower limit fL (lower limit communication frequency), the resonance frequency thereof is an upper limit fH and the resonance frequency thereof is an average fc of the lower limit and upper limit in the communication frequency band, respectively; -
FIG. 9 is an explanatory view in which the directions of the antenna radiation pattern are defined; -
FIGS. 10A and 10B are characteristic curves showing examples of the antenna radiation pattern in a comparative example; -
FIGS. 11A and 11B are characteristic curves, in whichFIG. 11A shows an example of the antenna radiation pattern in a comparative example (H=165mm) andFIG. 11B shows an example of antenna radiation pattern according to an embodiment of the present invention (H=165mm); -
FIG. 12 is a characteristic curve which shows an example of the antenna radiation efficiency, when amobile phone unit 1 is folded; -
FIG. 13 is a plan view showing an example of a state of thefirst circuit board 12 and thesecond circuit board 22, when a mobile phone unit (mobile communication terminal) according to an exemplary embodiment of the present invention is fully opened; -
FIGS. 14A and 14B are connection diagrams showing an example of the connection of a passive antenna of a mobile phone unit according to the exemplary embodiment of the present invention; -
FIGS. 15A and 15B are views showing the mobile phone unit according to the exemplary embodiment of the present invention, in whichFIG. 15A is a plan view showing a state of the casing thereof, andFIG. 15B is a connection diagram showing an example of the connection of a passive antenna in the state; -
FIGS. 16A and 16B are views showing a mobile phone unit according to the exemplary embodiment of the present invention, in whichFIG. 16A is a plan view showing a state of the casing thereof, andFIG. 16B is a connection diagram showing an example of the connection of a passive antenna in the state; -
FIGS. 17A and 17B are views showing a mobile phone unit according to the exemplary embodiment of the present invention, in whichFIG. 17A is a plan view showing a state of the casing thereof, andFIG. 17B is a connection diagram showing an example of the connection of a passive antenna in the state; -
FIGS. 18A and 18B are views showing a mobile phone unit according to the exemplary embodiment of the present invention, in whichFIG. 18A is a plan view showing a state of the casing thereof, andFIG. 18B is a connection diagram showing an example of the connection of a passive antenna in the state; -
FIGS. 19A and 19B are characteristic curves showing the antenna radiation efficiency according to the exemplary embodiment of the present invention, in whichFIG. 19A shows an example of the characteristic when a terminal is opened, andFIG. 19B shows an example thereof when the terminal is closed; and -
FIG. 20 is a plan view showing a modified example of a mobile phone unit (mobile communication terminal) according to the exemplary embodiment of the present invention. - Hereinafter, the first embodiment of the present invention will be explained with reference to
FIGS. 1 to 12 . -
FIGS. 1A and 1B are views showing a mobile phone unit 1 (mobile communication terminal) according to this embodiment;FIG. 1A is a plan view andFIG. 1B is side section view. A communication frequency band that themobile phone 1 uses for communication is predetermined in every system. The communication frequency band is from about 0.83GHz to about 0.93GHz, for example. Hereupon, the lower limit of the communication frequency band is called fL (the lower limit frequency), the upper limit thereof is called fH, and the average between the lower limit and upper limit is called fc. - The
mobile phone unit 1 includes afirst casing 10 and asecond casing 20. As shown inFIG. 1A , buttons such as a ten-key are provided in thefirst casing 10. A display is provided in thesecond casing 20. Thefirst casing 10 and thesecond casing 20 are connected by a hinge not shown in the figure. Themobile phone unit 1 can be folded by means of this hinge such that the buttons of thefirst casing 10 and the display of thesecond casing 20 are opposed to each other. InFIGS. 1A and 1B , thefirst casing 10 and thesecond casing 20 are at an angle of almost 45 degrees, and themobile phone unit 1 is recognized as being open in such state. The angle made by thefirst casing 10 and thesecond casing 20 may not almost exist in some cases. Also, there is so-called a turning type in which thesecond casing 20 is rotated clockwise or counterclockwise with respect to thefirst casing 10 and can be folded. In the following embodiments, in the case where a mobile phone unit capable of being folded is mentioned, all the types described above are included. - As shown in
FIG. 1B , thefirst casing 10 has afirst circuit board 12 and thesecond casing 20 has asecond circuit board 22. Thefirst circuit board 12 and thesecond circuit board 22 are connected by acircuit board hinge 30. With this, thefirst circuit board 12 and thesecond circuit board 22 can change the posture flexibly depending on the folded state of themobile phone unit 1. -
FIG. 2 is a plan view showing a state of thefirst circuit board 12,second circuit board 22 andcircuit board hinge 30, when themobile phone unit 1 is fully opened and thefirst casing 10 and thesecond casing 20 face almost in the same direction (when opened). - A GND (ground potential)
portion 14, apower feeding antenna 16, apower supply portion 17 and afeed point 18 are provided in thefirst circuit board 12. - The GND (ground potential)
portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern. Thepower feeding antenna 16 is an antenna to which high frequency electric power is supplied. Thepower supply portion 17 is connected to theGND portion 14 and thepower feeding antenna 16 and supplies the high frequency electric power between theground portion 14 and thepower feeding antenna 16. Thefeed point 18 is a portion at which thepower feeding antenna 16 is connected to thefirst circuit board 12, and thepower feeding antenna 16 receives power through thefeed point 18. - A GND (ground potential)
portion 24 and apassive antenna 26 are attached to thesecond circuit board 22. - The GND (ground potential)
portion 24 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern. Thepassive antenna 26 is an antenna to which power is not supplied. Thepassive antenna 26 is connected to theground portion 24. - Here, the whole length L = La + Lb (La: a portion parallel to the short side of the
second circuit board 22, Lb: a portion parallel to the long side of the second circuit board 22) of thepassive antenna 26 is approximately a quarter of a wavelength λ of a radio wave corresponding to the fL (lower limit frequency). In other words, L=λ/4. With such construction, thepassive antenna 26 is made to resonate at the lower limit communication frequency fL. Note that the whole length L of thepassive antenna 26 may not be λ/4 on condition that the antenna resonates at the lower limit communication frequency. - Further, the
passive antenna 26 can be provided on thesecond circuit board 22 instead of being attached to the outside of thesecond circuit board 22. The modified examples are shown inFIGS. 3A to 3D . - As shown in
FIG. 3A , thepassive antenna 26 may have the circuit pattern of the shape of meanders. As shown inFIG. 3B , thepassive antenna 26 may have the circuit pattern of an approximately straight shape in which the long side portion is considerably longer than the short side portion. Further, thepassive antenna 26 may not be the circuit pattern and may be a wire as shown inFIG. 3C and may be a metal plate as shown inFIG. 3D . - In the above described examples, the
passive antenna 26 is made to resonate at the lower limit communication frequency fL by adjusting the whole length L of thepassive antenna 26. However, instead of adjusting the whole length L of thepassive antenna 26, as shown inFIG. 4 , acircuit chip 25 may be connected to thepassive antenna 26 and theGND portion 24 to make thepassive antenna 26 resonate at the lower limit communication frequency fL. -
FIGS. 5A and 5B show a state of thefirst circuit 12,second circuit 22 andcircuit board hinge 30, when themobile phone unit 1 is folded and thefirst casing 10 and thesecond casing 20 oppose to each other;FIG. 5A is a side view andFIG. 5B is a plan view. - As shown in
FIG. 5A , thepower feeding antenna 16 opposes to thepassive antenna 26. Further, thepower feeding antenna 16 is positioned at the back of thepassive antenna 26 shown inFIG. 5B , and thepower feeding antenna 16 opposes to thepassive antenna 26. Accordingly, thepower feeding antenna 16 and thepassive antenna 26 are electromagnetically coupled. -
FIGS. 6A and 6B show a comparative example to be compared with a practice example of the present invention;FIG. 6A is a plan view andFIG. 6B shows the antenna radiation efficiency. - As shown in
FIG. 6A , the comparative example has nopassive antenna 26. In this case, the antenna radiation efficiency changes depending on the whole length H of the circuit board that is the sum of the length of thefirst circuit board 12 and the length of the second circuit board 22 (refer toFIG. 6B ). It is recognized that H=125mm is the case with which the radiation efficiency becomes highest in the desired communication frequency band (the desired band). - In
FIGS. 7A and 7B, FIG. 7A shows the antenna radiation efficiency in a comparative example (H=165mm), andFIG. 7B shows the antenna radiation efficiency in a practice example (H=165mm) of the present invention. - As shown in
FIG. 7A , the antenna radiation efficiency in the comparative example (H=165mm) is not desirable, because it becomes particularly low around the lower limit of the desired band. On the other hand, as shown inFIG. 7B , the antenna radiation efficiency in the practice example (H=165mm) of the present invention becomes almost constant within the desired band and is desirable, while the whole length H of the circuit board is the same as that of the comparative example. Hence, the antenna radiation efficiency becomes desirable in the desired band regardless of the whole length H of the circuit board according to the practice example of the present invention. -
FIG. 8 shows the antenna radiation efficiency of apassive antenna 26 in the communication frequency band, in each of the cases where the resonance frequency thereof is a lower limit fL (lower limit communication frequency), is an upper limit fH and is an average fc of the lower limit and upper limit. As shown inFIG. 8 , the antenna radiation efficiency becomes particularly low around the lower limit fL in the communication frequency band, when the resonance frequency of thepassive antenna 26 is fH and fc, which is not favorable. On the other hand, the antenna radiation efficiency becomes excellent over the whole of the desired band, when the resonance frequency of thepassive antenna 26 is fL, which is favorable. - Therefore, since the
passive antenna 26 is provided in thesecond circuit board 22 and the resonance frequency of thepassive antenna 26 is fL, the antenna radiation efficiency becomes excellent over the whole of the desired band and the desirable effectiveness can be obtained. - Here, directions are defined as shown in
FIG. 9 and the antenna radiation pattern in the comparative example is shown inFIGS. 10A and 10B . It is known that the radiation pattern from the minute current element is a sine curve, and originally, the direction of maximum radiation is the side directions (90°, 270°) and should become symmetrical with the top and bottom (the directions of 0° and 180°). The case shown inFIG. 10A (H=125mm) is the original radiation pattern, and the antenna radiation efficiency is excellent (refer toFIG. 6B ). - However, depending on the whole length H of the circuit board, the phase of the high-frequency current which flows on the circuit board is reversed on the path of the current, and so the offset of the radiation occurs to make the antenna radiation pattern distorted. As a result, the direction of maximum radiation will shift upward (in the directions of 0° and 360°) from the side directions (90°, 270°). It is a case (H=165 mm) shown in
FIG. 10B . In this case, the radiation characteristics (efficiency and band) becomes deteriorated by the offset of the radiation (refer toFIG. 6B ). While the phase reversal generally occurs by the half-wavelength in the high frequency current, the phase reversal occurs by the length shorter than the half-wavelength when the current flows in the circuit board or the like having the width and thickness. - In
FIGS. 11A and 11B, FIG. 11A shows the antenna radiation pattern in the comparative example (H=165mm) andFIG. 11B shows the antenna radiation pattern in the practice example (H=165mm) of the present invention. - As shown in
FIG. 11A , the antenna radiation pattern in the comparative example (H=165mm) is not desirable, because the direction of maximum radiation shifts upward (in the directions of 0° and 360°). On the other hand, as shown inFIG. 11B , the practice example of the present invention (H=165mm) is desirable, because the direction of maximum radiation comes closer to the side directions (90°, 270°), while the whole length H of the circuit board is the same as that of the comparative example. Hence, according to the practice example of the present invention, the antenna radiation pattern becomes desirable regardless of the whole length H of the circuit board. - The characteristics of the antenna when the
mobile phone unit 1 is opened have heretofore been explained, hereupon, the antenna radiation efficiency when themobile phone unit 1 is folded is shown inFIG. 12 . As is obvious fromFIG. 12 , the antenna radiation efficiency of the practice example 1 according to the present invention is higher than that of the comparative example in the desired band. - Next, an example system, for understanding only, will be explained with reference to
FIGS. 13 to 20 . Since the second embodiment is also applied to the folding type mobile phone unit 1 (the mobile communication terminal) similarly to the first embodiment, the same reference numerals are given to the same members as those in themobile phone unit 1 explained in the first embodiment and the detailed explanation is omitted. -
FIG. 13 is a drawing of a mobile phone unit (mobile communication terminal) 1 according to this embodiment of the present invention and is a plan view showing a state of afirst circuit board 12,second circuit board 22 andcircuit board hinge 30, when themobile phone unit 1 is fully opened and afirst casing 10 and asecond casing 20 face almost in the same direction (when opened). - A GND (ground potential)
portion 14, apower feeding antenna 16, apower supply portion 17 and afeed point 18 are provided in thefirst circuit board 12. - The GND (ground potential)
portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern. Thepower feeding antenna 16 is an antenna to which the high frequency electric power is supplied. Thepower supply portion 17 is connected to theground portion 14 and thepower feeding antenna 16 and supplies the high frequency electric power between thepower feeding antenna 16 and theGND portion 14. Thefeed point 18 is a portion at which thepower feeding antenna 16 is connected to thefirst circuit board 12, and thepower feeding antenna 16 receives power through thefeed point 18. - The
second circuit board 22 has a GND (ground potential)portion 24, and apassive antenna 26 is attached to theGND portion 24 through aswitch 27. - The GND (ground potential)
portion 24 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern. Thepassive antenna 26 is an antenna to which power is not supplied. Thepassive antenna 26 is connected to theGND portion 24 through theswitch 27. - The
switch 27 is switched between when themobile phone unit 1 is fully opened and thefirst casing 10 and thesecond casing 20 are opened and when thefirst casing 10 and thesecond casing 20 are closed, for example. The switching of this switch is performed by the control of a control portion (not shown in the figure) which detects the states of the opening and closing of themobile phone unit 1, for example. Alternatively, a switch changed mechanically in accordance with the opening and closing operations of themobile phone unit 1 may be used. - Similarly to the first embodiment, the whole length of the
passive antenna 26 is preferable to be approximately a quarter of a wavelength λ of the radio wave corresponding to the fL (lower limit frequency). In other words, L=λ/4. With such construction, thepassive antenna 26 is made to resonate at the lower limit communication frequency fL. Note that the whole length L of thepassive antenna 26 may not be λ/4 on condition that the antenna resonates at the lower limit communication frequency. - Further, similarly to the first embodiment, the
passive antenna 26 may be provided on thesecond circuit board 22 instead of being attached to the outside of thesecond circuit board 22 and may have various shapes as shown inFIGS. 3A to 3D , for example. - When the
GND portion 24 and thepassive antenna 26 are connected through theswitch 27, circuit components (a coil, resistance, capacitor and so on) made of chip components and the like may be attached. Specifically, as shown inFIG. 14A for example, acoil 41a (thiscoil 41a has the inductance value of 33nH or 30nH, for example) is connected between theGND portion 24 and thepassive antenna 26, when theswitch 27 is closed. Further, thepassive antenna 26 is made not to connect to thecoil 41a and theGND portion 24, when the switch is opened. - Further, as shown in
FIG. 14B for example, a switch connected to thepassive antenna 26 is provided as a switch 27' which can be switched from one side to the other side, and acoil 41a is connected between theGND portion 24 and thepassive antenna 26 when the switch changes to one side, and acoil 41b is connected between theGND portion 24 and thepassive antenna 26 when the switch changes to the other side. Thecoil 41a has the inductance value of 33nH, for example, and thecoil 41b has the inductance value of 30nH, for example. The inductance components formed of a chip component are used as thecoils -
FIGS. 15A and 15B andFIGS. 16A and 16B are drawings which show an example of a state of thepassive antenna 26 when themobile phone unit 1 is opened (FIGS. 15A and 15B ), and show an example of a state of thepassive antenna 26 when themobile phone unit 1 is closed (FIGS. 16A and 16B ), in the case where the connection configuration shown inFIG. 14A is employed. - When the
mobile phone unit 1 is opened as shown inFIG. 15A , theswitch 27 is in an open state as shown inFIG. 15B and thepassive antenna 26 is in a state of being separated from thecoil 41a and the GND 24 (that is, a state of being separated from the circuit board inside the second casing 20). - When the
mobile phone unit 1 is closed as shown inFIG. 16A , theswitch 27 is in a closed state as shown inFIG 16B and thepassive antenna 26 is in a state of being connected to theGND portion 24 through thecoil 41a. -
FIGS. 17A and 17B andFIGS. 18A and 18B are drawings which show an example of a state of thepassive antenna 26 when themobile phone unit 1 is opened (FIGS. 17A and 17B ), and show an example of a state of thepassive antenna 26 when themobile phone unit 1 is closed (FIGS. 18A and 18B ), in the case where the connection configuration shown inFIG. 14B is employed. - When the
mobile phone unit 1 is opened as shown inFIG. 17A , the switch 27' is in a state of being connected to one side as shown inFIG. 17B and thepassive antenna 26 is in a state of being connected to theGND portion 24 through thecoil 41a. - When the
mobile phone unit 1 is closed as shown inFIG. 18A , the switch 27' is in a state of being connected to the other side as shown inFIG. 18B and thepassive antenna 26 is in a state of being connected to theGND portion 24 through thecoil 41b. - With such construction, when the
mobile phone unit 1 is closed, the characteristics as the mobile communication terminal becomes excellent, because the electromagnetic coupling e is generated between theantenna 16 on thefirst casing 10 side and thepassive antenna 26 on thesecond casing 20 side as shown inFIG. 16A or18A . Further, when themobile phone unit 1 is opened, the characteristics in the open state can be improved, because thepassive antenna 26 is in a state of being separated (FIGS. 15A and 15B ) or is in another connection state (FIG. 17A and 17B ). -
FIGS. 19A and 19B are characteristic curves showing an example of the antenna radiation efficiency of a practice example (practice example 2) according to the second embodiment of the present invention. Here,FIG. 19A shows an example of the characteristic in the frequency band for the wireless communication when amobile phone unit 1 is opened, andFIG. 19B shows an example of the characteristic in the frequency band for the wireless communication when amobile phone unit 1 is closed. - In this practice example, with respect to each state of the
mobile phone unit 1, the characteristics in three states are compared: the state in which the coil with the inductance value a (here, 33nH) is connected between thepassive antenna 26 and the GND portion, the state in which the coil with the inductance value b (here, 30nH) is connected between thepassive antenna 26 and the GND portion, and the state in which thepassive antenna 26 is separated from the GND portion. - As shown in
FIG. 19A , when themobile phone unit 1 is opened, the characteristics obtained in the case of using the inductance value b and in the case of not connecting to the passive antenna are superior to the characteristic obtained in the case of using the inductance value a, in almost all the frequency band for the communication. - Further, as shown in
FIG. 19B , when themobile phone unit 1 is closed, the characteristics obtained in the case of using the inductance value a and in the case of using the inductance value b are superior to the characteristic obtained in the case of not connecting to the passive antenna, in almost all the frequency band for the communication. - Therefore, for example, both in the examples of
FIGS. 15A and 15B andFIGS. 16A and 16B , excellent communication characteristics are obtained, in which when the terminal is opened, the passive antenna is not connected and in which when the terminal is closed, the passive antenna is connected to the GND portion through the coil of the inductance value a or b. - Further, for example, both in the examples of
FIGS. 17A and 17B andFIGS. 18A and 18B , excellent communication characteristics are obtained, in which when the terminal is opened, the passive antenna is connected to the GND portion through the coil of the inductance value b and in which when the terminal is closed, the passive antenna is connected to the GND portion through the coil of the inductance value a. - Note that the radiation efficiency shown in
FIG. 19 changes depending on various factors regarding a structure such as the size of a circuit board to which an antenna is connected, and the state in which characteristic is more favorable depends on the structure. Also, regarding the inductance values, the values mentioned above are examples. - Further, in the second embodiment heretofore explained, the
switch 27 or 27' to switch the connection of the passive antenna is provided at the end portion where the GDN portion of the antenna is connected, however the switch may be provided in the middle of the passive antenna and a part of the passive antenna is separated depending on the state of the terminal. - Specifically, as shown in
FIG. 20 for example, when aswitch 28 is provided in the middle of thepassive antenna 26 and the mobile phone unit is opened, about the half of the tip side of thepassive antenna 26 is separated from the GND portion by making theswitch 28 into the open state, and only the remaining half is connected to the GND portion. Then, when the mobile phone unit is closed, the whole of thepassive antenna 26 is made to connect to the GND portion by making theswitch 28 into the closed state. The circuit components such as a coil and so on may be connected in series to theswitch 28. - With the above construction, the antenna characteristic in each state of the mobile phone unit can be improved.
Claims (11)
- A mobile communication terminal (1) comprising:a first casing (10) including a power feeding antenna (16) to which power in a communication frequency band used for communication by said mobile communication terminal is supplied, anda second casing (20) connected to said first casing, and including a passive antenna (26) to which power is not supplied, characterised in that the passive antenna (26) resonates at approximately the lower limit communication frequency in the communication frequency band.
- The mobile communication terminal according to claim 1, wherein
the electrical length of said passive antenna is a quarter of a wavelength of a radio wave corresponding to said lower limit communication frequency. - The mobile communication terminal according to claim 1, wherein
said first casing and said second casing can be folded to be opposed to each other. - The mobile communication terminal according to claim 3, wherein
said power feeding antenna and said passive antenna are electromagnetically coupled when folded. - The mobile communication terminal according to claim 1, wherein
said first casing has a first circuit board to which said power feeding antenna is connected,
said second casing has a second circuit board in which said passive antenna is provided, and
power is supplied between said power feeding antenna and a ground potential of said first circuit board. - The mobile communication terminal according to claim 5, wherein
said passive antenna has a circuit pattern provided on said second circuit board. - The mobile communication terminal according to claim 6, wherein
said circuit pattern has the shape of meanders. - The mobile communication terminal according to claim 6, wherein
said circuit pattern has an approximately straight shape. - The mobile communication terminal according to claim 5, wherein
said passive antenna has a wire provided on said second circuit board. - The mobile communication terminal according to claim 5, wherein
said passive antenna has a metal plate provided on said second circuit board. - The mobile communication terminal according to claim 5, wherein
said second casing has a circuit member which is connected to said passive antenna and a ground potential of said second circuit board and which makes said passive antenna resonate at said lower limit communication frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07024685A EP1898490B1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003326689 | 2003-09-18 | ||
JP2003326689 | 2003-09-18 | ||
PCT/JP2004/013878 WO2005029638A1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024685A Division EP1898490B1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
Publications (3)
Publication Number | Publication Date |
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EP1555716A1 EP1555716A1 (en) | 2005-07-20 |
EP1555716A4 EP1555716A4 (en) | 2006-03-08 |
EP1555716B1 true EP1555716B1 (en) | 2008-03-12 |
Family
ID=34372828
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04773360A Expired - Fee Related EP1555716B1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
EP07024685A Expired - Fee Related EP1898490B1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024685A Expired - Fee Related EP1898490B1 (en) | 2003-09-18 | 2004-09-15 | Mobile communication terminal |
Country Status (4)
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EP (2) | EP1555716B1 (en) |
JP (1) | JP4426531B2 (en) |
DE (2) | DE602004012377T2 (en) |
WO (1) | WO2005029638A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US7696928B2 (en) | 2006-02-08 | 2010-04-13 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Systems and methods for using parasitic elements for controlling antenna resonances |
ES2661171T3 (en) * | 2006-04-18 | 2018-03-27 | Qualcomm Incorporated | Mobile terminal with a monopole type antenna |
US7616158B2 (en) | 2006-05-26 | 2009-11-10 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Multi mode antenna system |
JP5222716B2 (en) * | 2008-12-25 | 2013-06-26 | 京セラ株式会社 | Mobile device |
JP2010157833A (en) * | 2008-12-26 | 2010-07-15 | Panasonic Corp | Portable wireless apparatus |
JP6462247B2 (en) | 2014-06-26 | 2019-01-30 | Necプラットフォームズ株式会社 | ANTENNA DEVICE, RADIO COMMUNICATION DEVICE, AND BAND ADJUSTMENT METHOD |
US10193213B2 (en) * | 2015-10-14 | 2019-01-29 | Microsoft Technology Licensing, Llc | Self-adaptive antenna systems for electronic devices having multiple form factors |
CN115939729A (en) | 2019-02-22 | 2023-04-07 | 华为技术有限公司 | Antenna device and electronic apparatus |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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US5561436A (en) * | 1994-07-21 | 1996-10-01 | Motorola, Inc. | Method and apparatus for multi-position antenna |
TW320813B (en) * | 1996-04-05 | 1997-11-21 | Omron Tateisi Electronics Co | |
JP3767030B2 (en) * | 1996-09-09 | 2006-04-19 | 三菱電機株式会社 | Foldable wireless communication device |
AU4219797A (en) * | 1996-09-11 | 1998-04-02 | Matsushita Electric Industrial Co., Ltd. | Antenna system |
US5905473A (en) * | 1997-03-31 | 1999-05-18 | Resound Corporation | Adjustable array antenna |
JP3783447B2 (en) * | 1998-03-18 | 2006-06-07 | 株式会社村田製作所 | Antenna device and portable radio using the same |
SE9801381D0 (en) * | 1998-04-20 | 1998-04-20 | Allgon Ab | Ground extension arrangement for coupling to ground means in an antenna system, and an antenna system and a mobile radio device having such ground arrangement |
US5943021A (en) * | 1998-08-03 | 1999-08-24 | Ericsson Inc. | Swivel antenna with parasitic tuning |
US6246374B1 (en) * | 2000-04-06 | 2001-06-12 | Motorola, Inc. | Passive flip radiator for antenna enhancement |
AU2001280076B2 (en) * | 2000-08-28 | 2007-04-05 | In4Tel Ltd. | Apparatus and method for enhancing low-frequency operation of mobile communication antennas |
JP3830773B2 (en) * | 2001-05-08 | 2006-10-11 | 三菱電機株式会社 | Mobile phone |
JP2003037415A (en) * | 2001-07-25 | 2003-02-07 | Matsushita Electric Ind Co Ltd | Portable radio unit |
JP3502071B2 (en) * | 2001-08-08 | 2004-03-02 | 松下電器産業株式会社 | Radio antenna device |
EP1306922A3 (en) | 2001-10-24 | 2006-08-16 | Matsushita Electric Industrial Co., Ltd. | Antenna structure, methof of using antenna structure and communication device |
JP2003273620A (en) * | 2002-03-19 | 2003-09-26 | Sony Corp | Portable electronic equipment |
JP2003347815A (en) * | 2002-05-23 | 2003-12-05 | Nec Corp | Mobile radio equipment |
-
2004
- 2004-09-15 WO PCT/JP2004/013878 patent/WO2005029638A1/en active IP Right Grant
- 2004-09-15 DE DE602004012377T patent/DE602004012377T2/en active Active
- 2004-09-15 JP JP2005514113A patent/JP4426531B2/en not_active Expired - Fee Related
- 2004-09-15 EP EP04773360A patent/EP1555716B1/en not_active Expired - Fee Related
- 2004-09-15 DE DE200460026946 patent/DE602004026946D1/en active Active
- 2004-09-15 EP EP07024685A patent/EP1898490B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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DE602004026946D1 (en) | 2010-06-10 |
EP1555716A1 (en) | 2005-07-20 |
DE602004012377D1 (en) | 2008-04-24 |
WO2005029638A1 (en) | 2005-03-31 |
EP1898490A1 (en) | 2008-03-12 |
EP1898490B1 (en) | 2010-04-28 |
DE602004012377T2 (en) | 2009-03-12 |
JP4426531B2 (en) | 2010-03-03 |
JPWO2005029638A1 (en) | 2006-11-30 |
EP1555716A4 (en) | 2006-03-08 |
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