WO2005112194A1 - アンテナ装置およびアンテナ装置を用いた無線機 - Google Patents
アンテナ装置およびアンテナ装置を用いた無線機 Download PDFInfo
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- WO2005112194A1 WO2005112194A1 PCT/JP2005/007244 JP2005007244W WO2005112194A1 WO 2005112194 A1 WO2005112194 A1 WO 2005112194A1 JP 2005007244 W JP2005007244 W JP 2005007244W WO 2005112194 A1 WO2005112194 A1 WO 2005112194A1
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- antenna
- radiator
- antenna device
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/10—Auxiliary devices for switching or interrupting
- H01P1/15—Auxiliary devices for switching or interrupting by semiconductor devices
-
- 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
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- 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
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
- H01Q9/265—Open ring dipoles; Circular dipoles
Definitions
- Antenna device and wireless device using antenna device are antenna device and wireless device using antenna device
- the present invention relates to an antenna device that can be used in a plurality of frequency bands and a wireless device using the antenna device.
- FIG. 9 is a schematic configuration diagram of a conventional multi-frequency antenna described in Patent Document 1.
- 101a to 101d are metal pieces
- 102a and 102b are diode switch circuits
- 103a to 103d are choke coils for blocking high frequency signals
- 104a and b are grounded
- 105 is a control terminal
- 106 is a high frequency signal input / output terminal.
- Reference numeral 107 denotes a balanced line.
- Fig. 9 shows a balanced signal input to the high-frequency signal input / output terminal 106, the left and right dipole antenna elements are each composed of two sets of metal pieces 1 Ola ⁇ : LOld, and diode switch circuits 102a and 102b are interposed therebetween. It is provided.
- the metal pieces 101a to 101d are short-circuited via the choke coils 103a to 103d for blocking high-frequency signals.
- the control signal is input from a high-frequency signal input / output terminal 106 of the dipole antenna and a control terminal 105 connected in the vicinity of the high-frequency signal cutoff choke coils 103a to 103d.
- the diode switch circuits 102a and 102b by increasing the bias voltage at which the diode switch circuits 102a and 102b operate from the control terminal 105, the diode switch circuits 102a and 102b conduct, and the element length from the metal piece 101a to LOld becomes the element length. Resonate at low frequencies. [0008] With this configuration, the element length of the dipole antenna is changed by simple control of changing the bias voltage applied from the control terminal 105, so that resonance is efficiently performed at a plurality of single frequencies. Can be.
- FIG. 10 is a schematic configuration diagram of a conventional antenna described in Patent Document 2.
- 111 is a diversity antenna
- 112 is one side of a dipole antenna.
- Reference numeral 113 denotes a feeding point
- 114 denotes an opposite side parallel to one side 112
- 115 denotes a one-point loading point
- 116 and 117 denote switches.
- diversity antenna 111 operates as a loop antenna when switches 116 and 117 are turned on, and operates as a linear dipole antenna when switches 116 and 117 are turned off. Therefore, it is possible to obtain a diversity effect by switching between two antennas by using two different functions with one antenna.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-236209
- Patent Document 2 Japanese Patent Application Laid-Open No. 8-163015
- the usage pattern differs depending on the system. For example, in the case of voice communication, a user presses the wireless device against the side of the head. On the other hand, when performing data communication, since the user performs communication while checking the display of the wireless device, the directivity required of the wireless device changes depending on the communication mode.
- the antenna in the multi-band wireless device has a configuration that can be switched to a plurality of frequency bands and that the maximum radiation direction of the antenna can be switched by 90 degrees depending on the frequency band (usage pattern). .
- the multi-band wireless device can easily switch the resonance frequency while suppressing interference with other frequency bands. It is possible.
- the antenna configuration itself does not change even when the resonance frequency is switched, so that the directional characteristics of the antenna cannot be switched depending on the frequency band.
- the present invention has been made in view of the above-mentioned conventional circumstances, and is applicable to multi-band wireless devices corresponding to different communication modes such as voice communication and data communication. It is an object of the present invention to provide an antenna device and a radio device using the antenna device, which can switch a frequency band by 90 degrees according to a communication mode at the same time as switching a frequency band.
- the antenna device of the present invention provides a linear radiator, a linear first director, and one end connected to the radiator and the other end connected to the first director via a switch.
- First and second linear conductors wherein the first and second conductors are disposed symmetrically with respect to a plane orthogonal to the longitudinal direction of the radiator, and The first director, the first conductor and the The second conductor switches between a loop state connected on the loop and a separated state separated from each other by the switching of the switch.
- the maximum radiation direction of the antenna cannot be switched by 90 degrees in accordance with communication modes having different frequency bands, such as voice communication and data communication. I was strong.
- the radiator, the director, and the first and second conductors form a loop antenna when the switch is short-circuited, and the radiator and the director form a Yagi-Uda antenna when the switch is open.
- the antenna's frequency band can be switched by short-circuiting and opening the switch, and the maximum radiation direction of the antenna can be switched by 90 degrees.
- the antenna device of the present invention includes control means for controlling switching of the switch.
- the switch can be switched between short-circuit and open at any time, so that the convenience of the antenna is improved.
- the radiator, the first director, and the first and second conductors connected via the switch form a rectangular structure.
- the radiator, the first director, and the first and second conductors form a rectangular structure in the same plane, a high antenna gain when a switch is short-circuited can be obtained.
- the antenna device of the present invention includes first and second variable reactance elements connected to the first and second conductors.
- the first and second variable reactance elements may include the first and second variable reactance elements.
- the left-right balance of the antenna can be adjusted and the directional characteristics can be controlled.
- one end of each of the first and second conductors is connected at right angles to at least one of the radiator and the first director.
- the radiator, the first director, and the first and second conductors connected through the switch have a convex structure with the same plane.
- the radiator, the first director, and the first and second conductors connected via the switch form a concave structure in the same plane. I do. According to this configuration, even when the first and second conductors are located near the radiator and the director at the time of switch short-circuiting, it is possible to minimize the coupling of the electromagnetic field.
- the antenna device of the present invention includes a linear second director disposed between the radiator and the first director.
- the first and second directors are arranged in parallel with the radiator.
- the first and second directors are supplied with power by balanced lines.
- the influence of GND on the antenna can be suppressed, and the characteristics can be stabilized when the size of the substrate on which the antenna is mounted is reduced.
- the first and second directors are fed by an unbalanced line.
- the antenna device of the present invention includes the radiator, the first and second directors, and the
- First and second conductors are formed by conductor patterns on a dielectric substrate.
- the antenna device of the present invention includes the radiator, the first and second directors, and the
- a second conductor is formed on the surface of the dielectric chip and on or inside the Z.
- the radiator, the director, and the first and second conductors can be arranged so as to be folded three-dimensionally, so that the degree of freedom in antenna design is increased and the mounting area of the antenna is reduced.
- the size can be reduced.
- the radiator is constituted by linear first and second radiator caps having the same length, and the control means has one end having the first length. Connected to the radiator and other A first high-frequency signal blocking coil having one end grounded; a second high-frequency signal grounding capacitor having one end connected to the second radiator, the other end connected to a control terminal, and one end grounded; And a high-frequency cutoff coil.
- the operation of short-circuiting and opening of a plurality of switches can be simultaneously controlled by a minimum control circuit configuration.
- the radiator is constituted by linear first and second radiators having the same length
- the control means has one end having the first and second radiators.
- a first high-frequency signal blocking coil connected to the radiator and the first director and the other end is grounded; one end connected to the first and second conductors; and the other end to a control terminal.
- a second high-frequency signal blocking coil connected to a high-frequency signal grounding capacitor having one end grounded.
- the operation of short-circuiting and opening of a plurality of switches can be simultaneously controlled, and the left-right balance of the antenna is adjusted by changing the control voltage applied to the two control terminals.
- the directional characteristics can be controlled.
- the radiator is constituted by linear first and second radiator caps having the same length
- the control means has one end provided with the first radiator cap.
- a first stub connected to the radiator, one end connected to the other end of the first stub, the other end grounded, a first resonance circuit resonating in a first frequency band;
- a second stub connected to the other end of the first stub and the other end grounded, a third stub one end connected to the second radiator, and one end connected to the third stub
- a second resonance circuit connected to the other end of the third stub and grounded at the other end and resonating in a first frequency band; one end is connected to the other end of the third stub; the other end is a control terminal;
- a fourth stub connected to a high-frequency signal grounding capacitor having one end grounded, wherein the length of the first and third stubs is equal to the length of the first stub.
- the wavelength becomes a quarter of the guide wavelength, and the sum of the lengths of the first and second stubs and the sum of the lengths of the third and fourth stubs are lower than those of the first frequency band.
- the wavelength becomes 1/4 of the guide wavelength.
- the radiator is configured by linear first and second radiators having the same length, and one end of the control means has the first and second radiators.
- a first stub connected to the radiator and the first director, a first stub having one end connected to the other end of the first stub, and the other end grounded, and having a resonance in a first frequency band.
- a first stub having one end connected to the other end of the first stub and the other end grounded; and a third stub having one end connected to the first and second conductors.
- a second resonance circuit one end of which is connected to the other end of the third stub and the other end of which is grounded, which resonates in a first frequency band, and one end of which is the other end of the third stub
- a fourth stub connected to a control terminal and a high-frequency signal grounding capacitor grounded at one end.
- the length of the third stub is a quarter guide wavelength in the first frequency band, the sum of the lengths of the first and second stubs, and the length of the third and fourth stubs. Are in the second frequency band lower than the first frequency band and become a quarter guide wavelength.
- the operation of short-circuiting and opening of a plurality of switches can be controlled, and the left and right balance of the antenna can be adjusted by changing the control voltage applied to the two control terminals.
- the directional characteristics can be controlled. Further, since components such as coils are not directly mounted on the components of the antenna, stable characteristics can be obtained without errors due to variations in mounting and variations in individual components.
- the antenna device of the present invention is the switch power diode.
- the antenna device of the present invention is the MEMS switch.
- the size of the switch portion can be reduced, the size of the antenna itself can be reduced.
- the wireless device of the present invention uses the antenna device of the present invention.
- high-quality communication can be performed by changing antenna characteristics according to different communication modes.
- the switch is short-circuited.
- the radiator, the director, and the first and second conductors form a loop antenna, and when the switch is opened, the radiator and the director form a Yagi-Uda antenna.
- the maximum radiation direction of the antenna can be switched by 90 degrees at the same time as switching the frequency band of the antenna, and the antenna characteristics can be changed according to the different communication modes of the frequency band, such as voice communication and data communication, to achieve high quality Communication can be performed.
- FIG. 1 is a schematic configuration diagram of a multiband antenna according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing an example of a configuration of a control circuit in the multiband antenna according to the first embodiment of the present invention.
- FIG. 3 is a schematic configuration diagram of a multiband antenna according to a second embodiment of the present invention.
- FIG. 4 is a schematic configuration diagram of a multi-band antenna according to a third embodiment of the present invention.
- FIG. 5 is a schematic configuration diagram of a multi-band antenna to which a second director is added according to a fourth embodiment of the present invention.
- FIG. 6 is a schematic configuration diagram of a symmetric multi-band antenna according to a fifth embodiment of the present invention.
- FIG. 7 is a schematic configuration diagram of a multi-band dielectric chip antenna having a three-dimensional structure according to a sixth embodiment of the present invention.
- FIG. 8 is a schematic configuration diagram of a multi-band dielectric chip antenna having a three-dimensional structure according to a sixth embodiment of the present invention.
- FIG. 10 Schematic configuration diagram of a conventional antenna
- FIG. 11 is an example of a schematic configuration of a multi-band antenna to which a reactance element is added according to the first embodiment of the present invention.
- FIG. 12 is another example of a schematic configuration of a multi-band antenna to which a reactance element is added according to the first embodiment of the present invention.
- control circuit 32 1st variable reactance element
- the gist of the present invention is to control a first radiator, a second radiator, a director, a first conductor, a second conductor, a switch connecting them, and a switch.
- the antenna characteristics can be switched between the loop antenna and the Yagi-Uda antenna by turning the switch on and off, and the frequency and directivity can be switched simultaneously.
- FIG. 1 is a schematic configuration diagram of the multiband antenna according to the first embodiment.
- 1 is a multiband antenna
- 2 is a first radiator made of a linear conductor
- 3 is a second radiator made of a linear conductor
- 4 is a first waveguide made of a linear conductor.
- 5 is the first conductor made of a linear conductor
- 6 is the second conductor made of a linear conductor
- 7a to 7d are diode switches
- 8 is a balanced line
- 9 is a feeding point
- 10a and 10b are high-frequency signals.
- Blocking coil, 11 is a capacitor
- 13 is a control terminal.
- first and second radiators 2 and 3 which are basic components of the antenna, are connected to a feed point 9 via a balanced line 8.
- the other ends of the first and second radiators 2 and 3 are connected to one ends of the first and second conductors 5 and 6 via diode switches 7a and 7d, respectively.
- first and second conductors 5, 6 are connected to the first director 4 via diode switches 7b, 7c, respectively.
- One end of each of high frequency signal blocking coils 10a and 10b is connected to the first and second radiators 2 and 3 for controlling the diode switches 7a to 7d.
- the other end of the high-frequency signal blocking coil 10a connected to the first radiator 2 is grounded by the ground 12a, and the high-frequency signal blocking coil 10b connected to the second radiator 3 At the other end, a control terminal 13 is connected, and a capacitor 11 for grounding a high-frequency signal is connected. The other end is grounded by a ground 12b.
- the operation of the above configuration will be described below.
- the high-frequency signal fed from the feed point 9 is transmitted to the first and second radiators 2 and 3 via the balanced line 8.
- the diode switches 7a to 7d become conductive, and the first and second radiators 2, 3, the first director 4, and the first The second conductors 5 and 6 are connected to each other and operate as a loop antenna.
- the diode switches 7a to 7d become non-conductive, and the first and second radiators 2, 3 and the first director 4 Element Yagi 'Operates as a Uda antenna.
- the first and second conductors 5 and 6 become parasitic elements, it is desirable to arrange them so as not to affect the operation of the two-element Yagi-Uda antenna as much as possible.
- the directional characteristics of the antenna become bidirectional such that the maximum radiation direction is the Z direction in FIG. 1, and the diode switches 7a to 7d
- the antenna When the antenna is operated as a two-element Yagi-Uda antenna without conducting, the antenna has a unidirectional characteristic such that the + Y direction in FIG. 1 is the maximum radiation direction.
- the circumference of the loop antenna that is, the first and second radiators 2 and 3 (L2, L3), the first director 4 (L4), the first and second conductors 5, 6 (L5, L6)
- the total length Lt is set to be approximately one wavelength ( ⁇ 1) in the low frequency band (F1).
- the length of the first and second radiators 2, 3 (L2, L3) of the two-element Yagi 'Uda antenna is high, and approximately one wavelength (F2) in the frequency band (F2).
- the length (L4) of the first director 4 in the two-element Yagi-Uda antenna is set to be slightly shorter than 1Z2 of one wavelength ( ⁇ 2) in the high frequency band (F2).
- the distance Ly in the ⁇ ⁇ -axis direction between the first director 4 and the first and second radiators 2 and 3 is high V, and in the frequency band (F2), about one wavelength ( ⁇ Set to 1Z4 in 2).
- high-frequency signal blocking coils 10a and 10b and capacitor 11 are used as control circuits 30a and 30b for applying control voltages to diode switches 7a to 7d.
- the constants of 10a and 10b are set so that the impedance of the coil part is sufficiently higher than the impedance of the first and second radiators 2 and 3 when the loop antenna operates and when the two-element Yagi and Uda antennas operate, respectively.
- the configuration may be set, or the configuration shown in FIG. 2 may be used.
- FIG. 2 shows a schematic configuration for applying a control voltage to the diode switches 7a to 7d using stubs instead of the high frequency signal blocking coils 10a and 10b of FIG.
- the first stubs 14a, 14b are used instead of the high-frequency signal blocking coils 10a, 10b, and one ends of the first stubs 14a, 14b are connected to the first and second radiators 2, 3.
- the other end is grounded with a ground 12c, 12d via a resonance circuit 17a including a capacitor 15a and a coil 16a, or a resonance circuit 17b including a capacitor 15b and a coil 16b, respectively, and is connected to one end of a second stub 18a, 18b.
- a resonance circuit 17a including a capacitor 15a and a coil 16a
- a resonance circuit 17b including a capacitor 15b and a coil 16b
- the other end of the second stub 18a connected to the first radiator 2 side is grounded by the ground 12a, and is connected to the other end of the second stub 18b connected to the second radiator 3 side.
- the length L14 of the first stubs 14a and 14b is one wavelength when the two-element Yagi-Uda antenna is operating (high, frequency band: F2). ( ⁇ 2) is set to 1Z4.
- the constants of the capacitors 15a and 15b and the coils 16a and 16b are selected so that the resonance circuits 17a and 17b resonate when the two-element Yagi-Uda antenna operates (high frequency band: F2).
- the sum of the lengths of the first stub 14a and the second stub 18a and the sum of the lengths of the first stub 14b and the second stub 18b (L14 + L18) are obtained when the loop antenna operates ( Low, frequency band:
- the first and second stubs 18a and 18b are made sufficiently narrower in line width than the first and second radiators 2 and 3 so that the first and second stubs 18a and 18b have a smaller line width.
- the antenna is composed of the first and second radiators 2 and 3, the first director 4, the first and second conductors 5 and 6, and the diode switches 7a to 7d.
- the diode switches 7a to 7d By switching on / off the diode switches 7a to 7d with a control voltage, it is possible to switch between loop antenna operation and 2-element Yagi / Uda antenna operation. This has the effect that it is possible to realize a multi-band antenna 1 that switches the angle by 90 degrees.
- the reactance value XI of the first variable reactance element 32 and the reactance value X2 of the second variable reactance element 33 are set to different values, respectively, if the control voltage is not applied to the control terminal 13, that is, Yagi When operated as a Uda antenna, the balance in the ⁇ X direction in Fig. 11 can be changed, so the directivity can also be controlled in the XY plane by changing the values of the first and second variable reactance elements. This has the effect of enabling directivity control in three dimensions.
- a stub is used as the variable reactance element, and the reactance component can be changed by inserting the variable capacitance element at the end of the stub or in the middle of the stub.
- the same effect can be obtained by inserting the first and second variable reactance elements 32 and 33 in the first and second linear conductors 5 and 6, respectively. Is obtained.
- the configuration as shown in FIG. 12 for example, when a control voltage is applied to the control terminal 13, that is, when operating as a loop antenna, the rear of the variable reactance elements 32, 33 By controlling the conductance value, it becomes possible to control the frequency during operation of the loop antenna.
- the components of the antenna are described as linear conductors.
- a pattern to be a component of the antenna may be formed on a dielectric substrate by etching or the like. Needless to say. With such a configuration, it is possible to reduce the size of the antenna under the influence of the effect of shortening the wavelength due to the dielectric constant of the dielectric substrate.
- the control is not limited to the negative control voltage.
- the force to reverse all the directions of the diode switches 7a to 7b, or the control circuits 30a and 30b are reversed left and right, and the first radiator 2 side
- the capacitor 11 and the control terminal 13 are connected to the second radiator 3, and the second radiator 3 side may be directly grounded to the ground 12b.
- diode switches 7a to 7b are used as switches.
- the present invention is not limited to this.
- FET Field-Effect Transistor
- MEMs Micro Electro Mechanical System
- Other switch circuits such as a switch using technology may be used.
- an SPST switch or the like incorporating a control circuit may be used. As a result, it is possible to eliminate the control circuits 30a and 30b, and to stabilize the characteristics of the multi-band antenna.
- the balanced line 8 is used as a feed line from the feed point 9 to the radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- an unbalanced line such as a microstrip line
- the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- FIG. 3 is a schematic configuration diagram of the convex multiband antenna 19 according to the second embodiment.
- a first conductor 20 is provided in place of the first conductor 5 in FIG. 1, and a second conductor 21 is provided in place of the second conductor 6 in FIG.
- Other configurations are the same as those of the first embodiment described with reference to FIG.
- the operation of the above configuration will be described below.
- the basic operation is the same as that described in Embodiment 1, except that the first conductor 20 and the second conductor 21 are formed as shown in FIG. 3 so that the loop antenna has a convex shape.
- the current of the first and second conductors 20, 21 near the first and second radiators 2, 3 is in the Y direction in FIG. 3, whereas the current of the first and second radiators 2, 3 is Since the current flowing through 3 is in the X direction in Fig. 3, the direction in which the current flows differs by 90 degrees.
- the resonance frequency can be switched at the same time in accordance with the frequency bands of different communication modes. It is possible to construct a multi-band antenna whose directional characteristics can be switched by 90 degrees, and it is possible to maintain good antenna characteristics for each of the diode switches 7a to 7d when they are turned on and off. .
- the components of the antenna are described as linear conductors.
- a pattern to be a component of the antenna may be formed on a dielectric substrate by etching or the like. . With this configuration, it is possible to reduce the size of the antenna under the influence of the effect of shortening the wavelength by the dielectric constant of the dielectric substrate.
- coils 10a and 10b for blocking high-frequency signals may be used as shown in FIG. Needless to say, it may be formed by the resonance circuits 17a and 17b including the first and second stubs 14a, 14b, 18a and 18b, the capacitors 15a and 15b, and the coils 16a and 16b as shown.
- the control is not limited to the negative control voltage. not.
- a force that reverses all the directions of the diode switches 7a to 7d, or the control circuits 30a and 30b are reversed left and right, and the first radiator 2 side
- the capacitor 11 and the control terminal 13 are connected to the second radiator 3, and the second radiator 3 side may be directly grounded to the ground 12b.
- diode switches 7a to 7d are used as switches.
- the present invention is not limited to this.
- other switch circuits such as switches using FET or MEMS technology are used. May be.
- an SPST switch or the like in which a control circuit is incorporated may be used.
- the control circuits 30a and 30b can be eliminated, and the characteristics of the multiband antenna can be stabilized.
- balanced line 8 is used as a feed line from feed point 9 to radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- the effect of GND on the antenna can be suppressed, so when the antenna is mounted on a small portable terminal, etc., the characteristics can be stabilized regardless of the board size on which the antenna is mounted.
- a balanced-unbalanced line conversion circuit (balun) is required.
- the antenna when an unbalanced line is used for the feeder line, for example, the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- FIG. 4 is a schematic configuration diagram of the concave multiband antenna 22 according to the third embodiment.
- FIG. 4 a first conductor 23 is provided instead of the first conductor 5 in FIG.
- a second conductor 24 is provided instead of the second conductor 6.
- Other configurations are the same as those of the first embodiment described with reference to FIG.
- the operation of the above configuration will be described below.
- the basic operation is as described in the first embodiment.However, by forming the first conductor 23 and the second conductor 24 as shown in FIG. 4 and making the loop antenna concave, While the currents of the first and second conductors 23 and 24 near the first and second radiators 2 and 3 are in the Y direction in FIG. 4, the first and second radiators 2 and 3
- the current flowing in the X direction is the X direction in Fig. 4, so the direction of current flow differs by 90 degrees.
- the resonance frequency can be switched simultaneously with the switching of the resonance frequency corresponding to the frequency bands of different communication modes.
- a multi-band antenna whose characteristics can be switched by 90 degrees can be configured, and when the diode switches 7a to 7d are turned on and off, favorable antenna characteristics can be maintained in each of them.
- the components of the antenna are described as linear conductors.
- a pattern to be a component of the antenna may be formed on a dielectric substrate by etching or the like. . With this configuration, it is possible to reduce the size of the antenna under the influence of the effect of shortening the wavelength by the dielectric constant of the dielectric substrate.
- control circuits 30a, 30b for applying a control voltage to diode switches 7a to 7d As shown in FIG. 4, high frequency signal blocking coils 10a, 10b may be used, or first and second stubs 14a, 14b, 18a, 18b and capacitors 15a, 15b as shown in FIG. Needless to say, the resonance circuits 17a and 17b may be formed by the coils 16a and 16b.
- the control is not limited to the negative control voltage.
- the force to reverse all the directions of the diode switches 7a to 7d, or the control circuits 30a and 30b are reversed left and right, and the first radiator 2 side
- the capacitor 11 and the control terminal 13 are connected to the second radiator 3, and the second radiator 3 side may be directly grounded to the ground 12b.
- the diode switches 7a to 7d are used as the switches.
- the present invention is not limited to this.
- other switch circuits such as FETs and switches using MEMS technology are used. May be.
- an SPST switch or the like in which a control circuit is incorporated may be used.
- the control circuits 30a and 30b can be omitted, and the characteristics of the multiband antenna can be stabilized.
- balanced line 8 is used as a feed line from feed point 9 to radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- the effect of GND on the antenna can be suppressed, so when the antenna is mounted on a small portable terminal, etc., the characteristics can be stabilized regardless of the board size on which the antenna is mounted.
- a balanced-unbalanced line conversion circuit (balun) is required.
- the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- FIG. 5 is a schematic configuration diagram of a multiband antenna 25 according to the fourth embodiment.
- reference numeral 26 denotes a second director.
- Other configurations are the same as those of the first embodiment described with reference to FIG. The operation of the above configuration will be described below.
- the basic operation is as described in Embodiment 1, but as shown in FIG. 5, the first and second radiators 2 and 3 are parallel to the first director 4 and By arranging the second director 26 at a position symmetrical with respect to the left and right, the first and second radiators 2, 3 and the first The director 4 and the second director 26 are respectively coupled to form a three-element Yagi'Uda antenna configuration.
- the diode switches 7a to 7d are turned on to operate as a loop antenna
- the electric field generated by the operation of the loop antenna when the second director 26 exists at the center of the loop is generated by the loop antenna.
- the direction is the Z direction
- the direction of the current flowing in the second director 26 ( ⁇ X direction) is orthogonal to the direction. Therefore, no coupling is theoretically generated. Therefore, the second director 26 can perform a good loop antenna operation without affecting the antenna characteristics during the operation of the loop antenna.
- the multi-band antenna 25 using the second director 26, it is possible to switch the resonance frequency corresponding to the frequency bands of different communication modes and simultaneously switch the directional characteristics by 90 degrees.
- a multi-band antenna can be configured, and when the diode switches 7a to 7d are turned on and off, good antenna characteristics can be maintained for each of them.
- the components of the antenna are described as linear conductors.
- a pattern to be a component of the antenna may be formed on a dielectric substrate by etching or the like. . With this configuration, it is possible to reduce the size of the antenna under the influence of the effect of shortening the wavelength by the dielectric constant of the dielectric substrate.
- control circuits 30a, 30b for applying a control voltage to the diode switches 7a to 7d may be used, or first and second stubs 14a, 14b, 18a and 18b and capacitors 15a and 15b as shown in FIG. Needless to say, the resonance circuits 17a and 17b may be formed by the coils 16a and 16b.
- the control is not limited to the negative control voltage. not.
- a force that reverses all the directions of the diode switches 7a to 7d, or the control circuits 30a and 30b are reversed left and right, and the first radiator 2 side
- the capacitor 11 and the control terminal 13 are connected to the second radiator 3, and the second radiator 3 side may be directly grounded to the ground 12b.
- diode switches 7a to 7d are used as switches.
- the present invention is not limited to this.
- other switch circuits such as switches using FET or MEMS technology are used. May be.
- an SPST switch or the like in which a control circuit is incorporated may be used.
- the control circuits 30a and 30b can be omitted, and the characteristics of the multiband antenna can be stabilized.
- balanced line 8 is used as a feed line from feed point 9 to radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- the effect of GND on the antenna can be suppressed, so when the antenna is mounted on a small portable terminal, etc., the characteristics can be stabilized regardless of the board size on which the antenna is mounted.
- a balanced-unbalanced line conversion circuit (balun) is required.
- the antenna when an unbalanced line is used for the feeder line, for example, the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- FIG. 6 is a schematic configuration diagram of a symmetric multi-band antenna 27 according to the fifth embodiment. 6, the basic components are the same as those of the first embodiment described with reference to FIG. 1, but two control terminals 13a and 13b are provided in the diode switches 7a to 7d.
- the first and second radiators 2 and 3 and the first director 4 are connected to the high-frequency signal blocking capacitors 10a, 10e and 10c respectively, and then connected to the grounds 12a, 12e and 12c. Being grounded!
- high-frequency signal blocking coils 10b and 10d are connected to the first and second conductors 5 and 6, respectively, and control terminals 13a and 13b are connected to their ends, respectively.
- the control circuits 30a to 30e are formed by connecting the capacitors 11a and 11b for grounding the high-frequency signal and grounding the ground with the grounds 12b and 12d.
- control terminals 13a and 13b connected to the first conductor 5 and the second conductor 6 are connected to each other. It can be realized by applying the same level of negative voltage to By not applying a voltage to both control terminals 13a and 13b, it is possible to operate as a two-element Yagi-Uda antenna as in the first embodiment.
- the right diode switches 7a and 7b and the left It is possible to control the isolation characteristics and the pass characteristics in the single switches 7c and 7d, and to control the directional characteristics when the two-element Yagi / Uda antenna operates.
- the antenna is composed of the first and second radiators 2 and 3, the first director 4, the first and second conductors 5 and 6, and the diode switches 7a to 7d.
- the diode switches 7a to 7d By switching the diode switches 7a to 7d on and off to the control voltage, the operating force as a loop antenna and the operation of a two-element Yagi and Uda antenna can be switched. This has the effect that it is possible to realize a multi-band antenna that switches the angle by 90 degrees.
- the left-right symmetric multi-band antenna 27 having two control terminals 13a and 13b is configured so that the left and right diode switches 7a to 7d can be controlled separately. It becomes possible to control the directional characteristics when the Uda antenna operates.
- the characteristics of the antenna are changed according to different communication modes to improve the performance as a wireless device. It is possible to provide a radio with high reliability!
- the components of the antenna are described as linear conductors.
- a pattern to be a component of the antenna may be formed on a dielectric substrate by etching or the like. . With this configuration, it is possible to reduce the size of the antenna under the influence of the effect of shortening the wavelength by the dielectric constant of the dielectric substrate.
- control circuits 30a to 30e for applying a control voltage to the diode switches 7a to 7d high-frequency signal blocking coils 10a to 10e as shown in FIG. 6 may be used. Needless to say, it may be formed by a resonance circuit 17a or the like including the first and second stubs 14a and 18a, the capacitor 15a, and the coil 16a as shown in FIG.
- the present invention is not limited to the negative control voltage. not.
- all the directions of the diode switches 7a to 7d are reversed, or the first radiator 2, the second radiator 3, and the first
- the control terminals 13a, 13b, and 13c are provided on the high-frequency signal cutoff coils 10a, 10e, and 10c connected to the director 4, and the high-frequency signal cutoff connected to the first conductor 5 and the second conductor 6 are provided.
- the coils 10b and 10d may be configured to be grounded by grounding 12b and 12d.
- first and second conductors 5 and 6 may be replaced with first and second conductors 20 and 21 shown in the second embodiment.
- the first and second conductors 23 and 24 shown in the third embodiment may be replaced.
- a configuration having the second director 26 as shown in the fourth embodiment may be adopted, needless to say!
- diode switches 7a to 7d are used as switches.
- the present invention is not limited to this.
- other switch circuits such as a switch using FET or MEMS technology may be used. May be.
- an SPST switch or the like in which a control circuit is incorporated may be used.
- the control circuits 30a to 30e can be eliminated, and the characteristics of the multiband antenna can be stabilized.
- balanced line 8 is used as a feed line from feed point 9 to radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- the effect of GND on the antenna can be suppressed, so that when the antenna is mounted on a small portable terminal, etc., the characteristics can be stabilized regardless of the board size on which the antenna is mounted.
- a balanced-unbalanced line conversion circuit (balun) is required.
- the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- FIG. 7 is a schematic configuration diagram of the multi-band dielectric chip antenna 28 according to the sixth embodiment.
- the control circuits 30a and 30b of the diode switches 7a to 7d are omitted.
- the first and second radiators 2 and 3, the first director 4, and the first and second conductors 5 are three-dimensionally arranged on the surface of the dielectric chip 29. 6.
- the diode switches 7a to 7d By arranging the diode switches 7a to 7d, the mounting area can be reduced as compared with the case of two-dimensional arrangement. Further, since the first and second radiators 2 and 3 and the first and second conductors 5 and 6 can be arranged at right angles, an effect of minimizing the coupling between the two can be obtained.
- the antenna is composed of the first and second radiators 2 and 3, the first director 4, the first and second conductors 5 and 6, and the diode switches 7a to 7d.
- the diode switches 7a to 7d By switching the diode switches 7a to 7d on and off to the control voltage, the operating force as a loop antenna and the operation of a two-element Yagi and Uda antenna can be switched. This has the effect that it is possible to realize a multi-band antenna that switches the angle by 90 degrees.
- the size of the mounting area can be reduced while the diode switches 7a to 7d are turned on and off. In each case, good antenna characteristics can be maintained.
- a radio device can be configured using the multi-band antenna described in the present embodiment.
- the performance of the wireless device can be improved by changing the characteristics of the antenna according to different communication modes, and a highly reliable wireless device can be provided.
- the first and second radiators 2 and 3, the first director 4, and the first and second conductors 5 and 6 are placed on the surface of the dielectric chip 29.
- the case of forming is described, it is also possible to adopt a configuration in which it is embedded in the dielectric chip 29 which is not so limited.
- the first director 4 and the first and second conductors A configuration in which the conductors 5 and 6 are arranged at right angles may be used. With such a configuration, the first director 4 and the first and second radiators 2 and 3 can suppress the coupling between the first and second conductors 5 and 6 only. The coupling with the second conductors 5 and 6 can also be suppressed.
- control circuits 30a and 30b for applying a control voltage to the diode switches 7a to 7d high-frequency signal blocking coils 10a and 10b as shown in FIG. 1 may be used, and FIG. Needless to say, it may be formed by a resonance circuit 17a including the first and second stubs 14a and 18a, the capacitor 15a, and the coil 16a as shown.
- the present invention is not limited to the negative control voltage.
- the force to reverse all the directions of the diode switches 7a to 7d, or the control circuits 30a and 30b are reversed left and right, and the first radiator 2 side
- the capacitor 11 and the control terminal 13 are connected to the second radiator 3, and the second radiator 3 side may be directly grounded to the ground 12b.
- control circuits 30a to 30e of the diode switches 7a to 7d have a left-right symmetric structure, and the left and right diode switches 7a to 7d can be controlled separately by two control terminals. It is good also as a structure.
- diode switches 7a to 7d are used as switches.
- the present invention is not limited to this. May be.
- an SPST switch or the like in which a control circuit is incorporated may be used.
- the control circuits 30a and 30b can be omitted, and the characteristics of the multiband antenna can be stabilized.
- balanced line 8 is used as a feed line from feed point 9 to radiators 2 and 3, but an unbalanced line such as a microstrip line may be used. good.
- the effect of GND on the antenna can be suppressed, so when the antenna is mounted on a small portable terminal, etc., the characteristics can be stabilized regardless of the board size on which the antenna is mounted.
- a balanced-unbalanced line conversion circuit (balun) is required.
- the antenna can be operated by connecting the unbalanced line to the first radiator 2 and grounding the second radiator 3 to GND. It becomes. In this case, it is possible to reduce the number of parts without having to provide a balanced-unbalanced conversion circuit (balun).
- the antenna device can switch the resonance frequency by the operation of short-circuiting and opening the diode switch, and can switch the directional characteristics by 90 degrees according to the frequency band! / ⁇ ⁇ It has an advantageous effect and is useful as a multi-band antenna applied to a wireless device integrating a plurality of wireless systems.
- it is also useful as, for example, a multi-band antenna built in a PC or the like adapted to a plurality of wireless systems.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/568,985 US7760150B2 (en) | 2004-05-18 | 2005-04-14 | Antenna assembly and wireless unit employing it |
EP05730534A EP1753082A1 (en) | 2004-05-18 | 2005-04-14 | Antenna assembly and wireless unit employing it |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004147267 | 2004-05-18 | ||
JP2004-147267 | 2004-05-18 | ||
JP2005-042572 | 2005-02-18 | ||
JP2005042572A JP4871516B2 (ja) | 2004-05-18 | 2005-02-18 | アンテナ装置およびアンテナ装置を用いた無線機 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005112194A1 true WO2005112194A1 (ja) | 2005-11-24 |
Family
ID=35394457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/007244 WO2005112194A1 (ja) | 2004-05-18 | 2005-04-14 | アンテナ装置およびアンテナ装置を用いた無線機 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7760150B2 (ja) |
EP (1) | EP1753082A1 (ja) |
JP (1) | JP4871516B2 (ja) |
WO (1) | WO2005112194A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7760150B2 (en) | 2010-07-20 |
US20080231526A1 (en) | 2008-09-25 |
JP4871516B2 (ja) | 2012-02-08 |
EP1753082A1 (en) | 2007-02-14 |
JP2006005903A (ja) | 2006-01-05 |
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