WO2009081803A1 - アンテナ装置及びこれを用いた無線通信機 - Google Patents
アンテナ装置及びこれを用いた無線通信機 Download PDFInfo
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- WO2009081803A1 WO2009081803A1 PCT/JP2008/072912 JP2008072912W WO2009081803A1 WO 2009081803 A1 WO2009081803 A1 WO 2009081803A1 JP 2008072912 W JP2008072912 W JP 2008072912W WO 2009081803 A1 WO2009081803 A1 WO 2009081803A1
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- conductor
- antenna device
- coupling
- radiation
- power supply
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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
- 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
- H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
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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
- 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 an antenna device, and more particularly to a conductor pattern shape of a surface mount antenna used for a mobile phone or the like.
- the present invention also relates to a radio communication device using this antenna device.
- Small antenna devices are built in small wireless communication devices such as mobile phones.
- 18 and 19 are schematic perspective views showing an example of the configuration of a conventional antenna device.
- the antenna device shown in FIG. 18 includes a base 1 made of a rectangular parallelepiped dielectric, and a linear radiating conductor 2 provided at the center in the width direction of the upper surface of the base 1, and one end of the radiating conductor 2 is a gap. The other end is connected to a grounding conductor 3 provided on the bottom surface of the substrate 1. Since the open end of the radiating conductor 2 is electromagnetically coupled to the feeding electrode 4 through a capacitance by the gap g, it can be excited without contact with the feeding line, and impedance matching is easy even when it is downsized. (See Patent Document 1).
- the antenna device shown in FIG. 19 is configured in an L shape by bending the other end of the radiation conductor 2.
- a power supply electrode 4 is formed on the surface of the base 1, and the power supply electrode 4 is connected to the short-circuited end of the radiation conductor 2 through a gap g. According to this, the resonance wavelength of the antenna can be increased with respect to the chip size (see Patent Document 2).
- the conventional antenna device shown in FIG. 18 has a structure in which the ends of the elongated strip-shaped conductor patterns are opposed to each other with a gap g having a predetermined width, and the opposed range is narrow, so that a large capacitive coupling can be obtained. There is a problem that can not be.
- the conventional antenna device shown in FIG. 19 has a feed conductor formed along the longitudinal direction of the radiation conductor and has a relatively wide range, so that a larger capacitive coupling can be obtained.
- the power supply conductor is formed on both the upper surface and the side surface of the base and it is necessary to secure a wide area for forming the power supply conductor, the main surface of the base must be used efficiently for the radiation conductor. There is a problem that the whole antenna device becomes large.
- the antenna device described in FIGS. 18 and 19 has a problem that the antenna characteristics greatly change depending on the mounting position on the printed circuit board. Such a problem is mentioned in Patent Document 3, and it is said that the antenna characteristics change when the positional relationship between the ground pattern on the printed circuit board and the antenna device changes.
- the phenomenon that the antenna characteristics change depending on the mounting position becomes prominent when the radiation conductor and the feed conductor are capacitively coupled using a gap. For this reason, in order to suppress the change in antenna characteristics depending on the mounting position, it is considered that the radiation conductor and the feed conductor may be coupled by a method other than capacitive coupling.
- an object of the present invention is to obtain a high radiation efficiency by increasing the electromagnetic field coupling in an antenna device that supplies a radiation current by electromagnetic field coupling.
- an object of the present invention is to reduce the size of the entire antenna device by efficiently using the main surface of the base in an antenna device that supplies a radiation current by inductive coupling.
- Another object of the present invention is to provide a wireless communication device using such an antenna device.
- An antenna device includes a base made of a dielectric or magnetic material, and a conductor pattern formed on the base.
- the conductor pattern is formed on a radiation conductor, a substantially U-shaped feeding conductor, and one end of the radiation conductor.
- a wireless communication device includes a printed circuit board and the antenna device described above mounted on the printed circuit board.
- the present invention since the direction of the radiation current and the direction of the feeding current and the induction current are different from each other, it is possible to suppress the phenomenon that these cancel each other. As a result, high radiation efficiency can be obtained.
- the radiation conductor and the feed conductor are inductively coupled, there is little change in antenna characteristics depending on the mounting position.
- the feeding conductor and the coupling conductor are formed on a surface different from the surface on which the radiation conductor is formed, it is possible to sufficiently secure the length and area of the radiation conductor. Thereby, since the main surface of a base
- one end of the power supply conductor is connected to the power supply line and the other end of the power supply conductor is grounded.
- one end of the power supply conductor is connected to the power supply line and the other end of the power supply conductor is open. Since the impedance when one end of the feed conductor is grounded differs from the impedance when it is open, the antenna characteristics can be improved by selecting either connection state according to the mounting state of the antenna. it can.
- one end of the power supply conductor may be connected to the power supply line, and the other end of the power supply conductor may be grounded or opened via the switching means.
- the antenna characteristics can be further improved by switching the connection state of the feed conductors to active using the switching means.
- the direction in which the radiation current flows and the direction in which the feeding current flow are substantially orthogonal. According to this, it becomes possible to more effectively suppress cancellation of the radiation current and the feeding current.
- the base body is substantially a rectangular parallelepiped, at least a part of the radiation conductor is formed on the top surface of the base body, and the feeding conductor and the coupling conductor are formed on the first side surface orthogonal to the longitudinal direction of the base body.
- the radiation conductor is formed on almost the entire first surface of the substrate, the electrical resistance of the radiation conductor can be reduced.
- the conductor pattern formed on the base body is bilaterally symmetric about a predetermined reference plane.
- the reference surface is preferably a surface parallel to the side surface along the longitudinal direction of the substrate.
- the substantially U-shaped portion of the power supply conductor may be a gently curved curved shape or a bent shape bent at a right angle.
- capacitive coupling can be made stronger than in the case of a gently curved shape.
- the electromagnetic field coupling can be increased, and thereby high radiation efficiency can be obtained.
- the entire antenna device in an antenna device of a type that supplies a radiation current by electromagnetic field coupling, can be downsized by efficiently using the main surface of the base.
- a radio communication device using such an antenna device can be provided.
- FIG. 1 is a schematic perspective view showing the structure of an antenna device 100 according to a preferred first embodiment of the present invention.
- FIG. 2 is a development view of the antenna device 100.
- the antenna device 100 includes a base 110 made of a dielectric and a plurality of conductor patterns formed on the base 110.
- the base 110 has a rectangular parallelepiped shape with the A direction as the longitudinal direction. Accordingly, the base 110 has four surfaces 111 to 114 parallel to the A direction and two surfaces 115 and 116 orthogonal to the A direction. Of these, the surface 112 is a mounting surface for the printed circuit board.
- the material of the base 110 is not particularly limited, but a Ba—Nd—Ti-based material (relative permittivity of 80 to 120), an Nd—Al—Ca—Ti based material (relative permittivity of 43 to 46), Li—Al—Sr—Ti (relative permittivity 38 to 41), Ba—Ti based material (relative permittivity 34 to 36), Ba—Mg—W based material (relative permittivity 20 to 22), Mg—Ca— Ti-based materials (relative permittivity 19 to 21), sapphire (relative permittivity 9 to 10), alumina ceramics (relative permittivity 9 to 10), cordierite ceramics (relative permittivity 4 to 6), etc. can be used. .
- the base 110 is produced by firing these materials using a mold.
- the relative permittivity ⁇ r increases, a greater wavelength shortening effect can be obtained, so that the length of the radiation conductor can be shortened. However, the efficiency decreases, so that the relative permittivity ⁇ r is not necessarily larger. There is an appropriate value. Therefore, for example, when the target frequency is 2.4 GHz, it is preferable to use a material having a relative dielectric constant ⁇ r of about 5 to 30. According to this, it is possible to reduce the size of the radiation conductor while ensuring sufficient efficiency.
- Preferred examples of the material having a relative dielectric constant ⁇ r of about 5 to 30 include Mg—Ca—Ti based dielectric ceramics. As the Mg—Ca—Ti dielectric ceramic, it is particularly preferable to use an Mg—Ca—Ti dielectric ceramic containing TiO 2 , MgO, CaO, MnO, and SiO 2 .
- the conductor pattern includes a radiation conductor 121, a feeding conductor 122, a coupling conductor 123, and an adjustment conductor 124.
- These conductor patterns can be formed by applying an electrode paste material by a method such as screen printing or transfer and then baking under a predetermined temperature condition.
- the electrode paste material silver, silver-palladium, silver-platinum, copper, or the like can be used.
- the conductor pattern can also be formed by plating or sputtering.
- the radiation conductor 121 is formed on almost the entire surface 111, 116 of the base 110, and has a continuous belt-like structure. One end 121a of the radiation conductor 121 is connected to the coupling conductor 123, and the other end 121b is connected to the ground pattern on the printed circuit board.
- the power supply conductor 122 is formed on a part of the surface 115 of the base body 110 and has a substantially U-shaped continuous belt-like structure. One end 122a of the power supply conductor 122 is connected to the power supply line on the printed circuit board, and the other end 122b is connected to the ground pattern on the printed circuit board.
- the coupling conductor 123 is a part of the surface 115 of the base 110, is formed above the power supply conductor 122, and has a curved shape that matches the U-shape of the power supply conductor 122.
- the upper end of the coupling conductor 123 is connected to one end 121a of the radiation conductor 121, and the lower end (curved portion) faces the feed conductor 122 via a gap g having a substantially constant width. Since the upper end of the coupling conductor 123 is connected to the radiation conductor 121, it also functions as a part of the radiation conductor 121. In particular, since the width of the feeding conductor 123 at the connection portion with the radiation conductor 121 matches the width of the radiation conductor 121, radiation efficiency can be increased.
- the adjustment conductor 124 is formed on a part of the surface 112 of the base 110, and is connected to a characteristic adjustment land on the printed circuit board.
- the power supply conductor 122 has a coupling portion 122c extending in the B direction while being curved in a substantially U shape.
- the B direction is a direction orthogonal to the longitudinal direction.
- the coupling portion 122c of the power supply conductor 122 is formed on the surface 115, and the power supply conductor 122 and the coupling conductor 123 are arranged in parallel at a predetermined interval. Accordingly, the coupling portion 122c of the power supply conductor 122 and the coupling conductor 123 can be electromagnetically coupled.
- these conductor patterns formed on each surface of the substrate 110 are formed to be bilaterally symmetric with respect to a plane parallel to the side surfaces 113 and 114 of the substrate 110. According to this, even when the orientation of the antenna device 100 is rotated 180 degrees with respect to the axis (Z axis) perpendicular to the surfaces 111 and 112 of the base 110, the conductor pattern of the antenna device 100 is viewed from the end side of the printed circuit board. Since the shapes of the antennas are substantially the same, the antenna characteristics are not greatly changed depending on the mounting direction, and the antenna design can be facilitated.
- FIG. 3 is a schematic plan view showing enlarged shapes of the power supply conductor 122 and the coupling conductor 123.
- the insulating region (slit) 122s necessary for forming the power supply conductor 122 as a strip conductor defines the folded shape of the power supply conductor 122, but as shown by the arrows,
- the impedance can be changed by adjusting the depth and width. If the radiating conductor is elongated for miniaturization, the electromagnetic field coupling may become too strong, but the coupling can be weakened by reducing the depth D of the slit 122s. Impedance adjustment is also possible by adjusting the gap width g between the feed conductor 422 and the coupling conductor 123, but impedance adjustment by changing the depth or width of the slit 122s is more than when adjusting the gap width g. Also has the advantage of being easy to fine tune.
- FIG. 4 is a schematic plan view showing a pattern layout on a printed circuit board on which the antenna device 100 is mounted.
- an antenna mounting area 21 is provided on the printed circuit board 20 so as to be surrounded by a ground pattern 22 in three directions.
- Four lands 31 to 34 are formed in the antenna mounting area 21, and the antenna device 100 is soldered onto these lands 31 to 34.
- the land 31 is a land connected to the other end 121 b of the radiation conductor 121.
- the land 32 is a land connected to one end 122 a of the power supply conductor 122.
- the land 33 is a land connected to the other end 122 b of the power supply conductor 122.
- the land 34 is a land connected to the adjustment conductor 124. As shown in FIG. 4, the lands 31 and 33 are connected to the ground pattern 22, and the land 32 is connected to the power supply line 41. The land 34 is connected to the ground pattern 22 via the adjustment element 42.
- the adjustment element 42 an inductance element or a capacitance element can be used. As will be described later, the adjustment element 42 is an element added when the antenna characteristic is changed. Therefore, it is not essential to connect such an adjustment element 42. When the adjustment element 42 is not used, the land 34 may be directly connected to the ground pattern 22 or may be in a floating state.
- FIG. 5 is a schematic perspective view showing a state in which the antenna device 100 is mounted on the printed circuit board 20, and shows a part of a wireless communication device using the antenna device 100 according to the present embodiment.
- the other end 121 b of the radiation conductor 121 is connected to the ground pattern 22 via the land 31.
- the signal current is supplied to the one end 121a of the radiation conductor 121 via the coupling conductor 123, the radiation current Ia flows in the radiation conductor 121 mainly in the A direction which is the longitudinal direction of the base 110. It will be.
- one end 122 a is connected to the power supply line 41 through the land 32, and the other end 122 b is connected to the ground pattern 22 through the land 33.
- the feed current Ib supplied via the feed line 41 flows to the ground pattern 22 via the coupling portion 122c.
- the coupling portion 122c of the feed conductor 122 and the coupling conductor 123 are connected by capacitive coupling using a gap, a part of the feeding current Ib flows into the coupling conductor 123 via capacitive coupling.
- the coupling portion 122c is curved in a U shape and the range facing the coupling conductor 123 is wide, a larger capacitive coupling can be obtained.
- the induced current Ic corresponding to the feeding current Ib flows through the coupling conductor 123.
- the coupling portion 122c and the coupling conductor 123 of the power supply conductor 122 extend in the B direction orthogonal to the longitudinal direction, the direction in which the induced current Ic flows is also in the B direction.
- the induced current Ic flowing in the B direction is supplied to the radiating conductor 121 via the coupling conductor 123.
- the radiating current Ia flows in the A direction in the radiating conductor 121.
- the antenna device 100 since the direction in which the radiation current Ia flows and the direction in which the feed current Ib flows are different by 90 °, they are less likely to cancel each other. For this reason, it is possible to prevent a decrease in radiation efficiency due to cancellation.
- FIG. 6 is an equivalent circuit diagram of the antenna device 100 in a state mounted on the printed circuit board 20.
- the antenna device 100 constitutes a kind of inverted F antenna that is fed by electromagnetic coupling. Since the feeding conductor 122 and the coupling conductor 123 are arranged close to each other, a capacitance C1 is generated between them. In particular, since the coupling portion 122c of the power feeding conductor 122 is substantially U-shaped and has a wide range facing the coupling conductor 123, a large capacitive coupling can be obtained.
- electromagnetic field coupling is performed by a transformer M having the coupling portion 122c of the power supply conductor 122 as a primary side and the coupling conductor 123 as a secondary side. Furthermore, since the radiation conductor 121 and the adjustment conductor 124 are opposed to each other with the base 110 interposed therebetween, a capacitance C2 is generated between them. Therefore, in order to obtain a desired antenna characteristic, it is necessary to consider the coupling characteristic of the transformer M and the value of the capacitance C2 in addition to the value of the capacitance C1.
- the adjustment conductor 124 may be directly connected to the ground pattern 22 or may be in a floating state. However, when the antenna characteristics are to be changed, the adjustment conductor 124 is adjusted as shown in FIG. The element 42 may be connected. If the adjustment element 42 is connected, the reactance between the radiation conductor 121 and the ground changes, so that the antenna characteristics can be changed accordingly.
- the antenna device 100 is an antenna that is fed by electromagnetic coupling, and the direction in which the radiation current Ia flows differs from the direction in which the feed current Ib flows by 90 °.
- the radiation current Ia and the feeding current Ib are less likely to cancel each other, so that it is possible to prevent a decrease in radiation efficiency.
- the antenna device 100 includes the coupling conductor 123, and the radiation conductor 121 and the feed conductor 122 are electromagnetically coupled via the coupling conductor 123.
- the feeding current Ib does not flow directly through the radiation conductor 121, it becomes possible to more effectively prevent cancellation of the radiation current Ia and the feeding current Ib.
- the feeding conductor 122 is substantially U-shaped and is gently curved, electric field concentration hardly occurs.
- the distance can be made longer, and stronger electromagnetic field coupling with the coupling conductor 123 can be obtained. Therefore, current loss can be suppressed and radiation efficiency can be increased.
- the radiation conductor 121 is formed on the entire surface 111 parallel to the longitudinal direction, and the feeding conductor 122 and the coupling conductor 123 are formed on a surface different from the surface 111. Therefore, it is possible to secure a sufficient length and area of the radiation conductor 121. Further, since the coupling conductor 123 is connected to the radiating conductor 121 with the same width, the coupling conductor 123 can be effectively functioned as a part of the radiating conductor 121. Thereby, since the main surface of a base
- the power supply conductor 122 and the coupling conductor 123 are formed on the surface of the base 110, it is not necessary to form a through hole or the like in the base 110, and the manufacturing cost can be suppressed.
- FIG. 7 is a schematic plan view showing an example in which the antenna device 100 is mounted on an on-ground type printed circuit board 50 having a plurality of antenna mounting areas provided with ground patterns.
- the 7 has two antenna mounting areas 51 and 52.
- the antenna mounting area 51 is located at the corner of the printed circuit board 50, and is therefore surrounded by the ground pattern 53 from two directions.
- the antenna mounting region 52 is located along the side of the printed circuit board 50 and is therefore surrounded by the ground pattern 53 from three directions.
- FIG. 8 is a graph showing the characteristics of the antenna device mounted in the antenna mounting areas 51 and 52, (a) shows the characteristics when mounted in the antenna mounting area 51, and (b) is mounted in the antenna mounting area 52. The characteristics are shown. 8A and 8B, the characteristics when the antenna device 100 shown in FIG. 1 is mounted are shown by solid lines, and the characteristics when the conventional antenna device shown in FIG. 18 is installed are broken lines. It is shown in
- FIG. 8A when mounted in the antenna mounting area 51, there is no significant difference between the characteristics of the two antenna devices (here, radiation efficiency and VSWR), but as shown in FIG. 8B.
- the characteristics of the conventional antenna device are lower than those of the antenna device 100 according to the present invention. This is because when mounted on the antenna mounting area 51, the length G1 of the ground pattern 53 viewed from the gap is relatively long, whereas when mounted on the antenna mounting area 52, the ground pattern 53 viewed from the gap. This is because the length G2 is relatively short.
- the difference in antenna characteristics depending on the mounting position is very small. This is not only large in capacitive coupling using a gap, but also inductively coupled. Because. Thus, according to the antenna device 100 according to the present embodiment, it is also possible to suppress changes in antenna characteristics due to the mounting position on the printed circuit board.
- FIG. 9 and 10 are diagrams illustrating a configuration of an antenna device 200 according to the second embodiment of the present invention.
- FIG. 9 is a perspective view illustrating a state where the antenna device 200 is mounted on a printed circuit board. is there.
- FIG. 10 is a schematic plan view showing a pattern layout on a printed board on which the antenna device 200 is mounted.
- the antenna device 200 according to the present embodiment is different from the antenna device 100 in that the land 33 on the printed circuit board 20 is not connected to the ground pattern 22 and is in a floating state. It is different. Since the other points are the same as those of the antenna device 100, the same reference numerals are given to the same elements, and duplicate descriptions are omitted.
- one end 122a of the power supply conductor 122 is not grounded when the antenna device 200 is mounted, and is open. In this way, it is possible to change the impedance of the antenna by making the other end 122b of the feeding conductor 122 normally connected to the ground an open end. Thereby, it can be used as an impedance adjusting means when the antenna device is built in a mobile phone or the like.
- FIG. 11 and 12 are graphs showing changes in impedance characteristics of the antenna device.
- FIG. 11 is a graph when the land 33 is in a short state (see FIG. 4), and
- FIG. 12 is a floating state (open state, FIG. 10).
- 11 and 12 (a) is a Smith chart and (b) is a VSWR characteristic diagram.
- the impedance characteristics of the antenna device are greatly different when the land 33 is short-circuited and open.
- the change in impedance characteristics is relatively small and the VSWR characteristic has a steep peak near 2.4 GHz, whereas the land 33 is open. It can be seen that the change in impedance characteristic is relatively large and the VSWR characteristic has a gradual peak in the vicinity of 2.4 GHz.
- the impedance characteristic of the antenna device greatly varies depending on the connection state of the land 33. Therefore, the connection state of the land 33 can be used as impedance adjustment means of the antenna device. Furthermore, the connection state of the power supply conductor 122 can be changed actively according to the change in impedance during actual use.
- FIG. 13 is a diagram showing the configuration of the antenna device 300 according to the third embodiment of the present invention, and is an equivalent circuit diagram in a state where the antenna device 300 is mounted on the printed circuit board 20.
- the antenna device 300 of the present embodiment is different from the antenna device 100 in that it includes switching means 129 that grounds or opens the other end 122b of the feed conductor 122. Since the other points are the same as those of the antenna device 100, the same reference numerals are given to the same elements, and duplicate descriptions are omitted.
- the switching means 129 shown in the figure it is grounded in the on state and opened in the off state.
- a transistor can be used as the switching unit 129, for example.
- the switching timing of the switching means 129 may be matched with the change in the radio wave environment around the antenna. For example, when the radio wave environment changes depending on the open / close state of a bi-fold type mobile phone, switching may be performed in conjunction with the open / close state. Further, switching may be performed depending on whether or not the mobile phone is being operated (or held in the hand).
- the antenna device 300 includes the switching unit 129 that grounds or opens the other end 122b of the power supply conductor 122. Therefore, the connection of the power supply conductor 122 according to the change in antenna impedance during actual use. The state can be changed actively, and good antenna characteristics can be maintained even if the situation around the antenna changes.
- the connection state of the power supply conductor 122 is not limited to grounding and opening, and may be short-circuited via a predetermined resistance.
- FIG. 14 is a schematic perspective view showing the structure of an antenna device 400 according to a preferred fourth embodiment of the present invention.
- FIG. 15 is a development view of the antenna device 400.
- the antenna device 400 has a substantially U-shaped power supply conductor 422, but the substantially U-shaped portion of the power supply conductor 422 is not a curved shape that is gently curved, but a right angle. It is characterized by a bent shape (a U-shape) that is bent into two.
- the coupling conductor 423 has a bent shape that matches the U-shape of the power supply conductor 422. As a result, the power supply conductor 422 and the coupling conductor 423 are capacitively coupled via the bent gap g bent at a right angle.
- the upper end of the coupling conductor 423 is connected to one end 121a of the radiating conductor 121, and the lower end (bent portion) faces the power supply conductor 422 via a gap g having a substantially constant width. Since other configurations are substantially the same as those of the antenna device 100 according to the first embodiment, the same components are denoted by the same reference numerals and detailed description thereof is omitted.
- FIG. 16 is a schematic plan view showing enlarged shapes of the power supply conductor 422 and the coupling conductor 423.
- FIG. 17 is an enlarged schematic plan view showing a modified example of the shapes of the power feeding conductor 422 and the coupling conductor 423.
- the insulating region (slit) 422s necessary for forming the power supply conductor 422 as a strip conductor defines the folded shape of the power supply conductor 422, but as shown by the arrows,
- the impedance can be changed by adjusting the depth and width. If the radiating conductor is elongated for miniaturization, the electromagnetic field coupling may become too strong, but the coupling can be weakened by reducing the depth D of the slit 422s. Impedance adjustment is also possible by adjusting the gap width g between the feed conductor 422 and the coupling conductor 423, but impedance adjustment by changing the depth or width of the slit 422s is more than when adjusting the gap width g. Also has the advantage of being easy to fine tune.
- the impedance can be adjusted by changing the width W of the portion of the coupling conductor 423 extending in the direction perpendicular to the B direction (vertical direction).
- the conductor width W is preferably not less than 0.5 times and not more than 3 times the gap g. If it is less than 0.5 times, there is a problem that electromagnetic field coupling becomes too strong, and if it exceeds 3 times, there is a problem that electromagnetic field coupling becomes too weak.
- the conductor may be formed inside the edge 115e instead of being formed along the edge 115e of the side surface 115 of the base as shown in FIG. .
- the antenna device 400 is capacitively coupled to the feeding conductor 422 and the coupling conductor 423 via the bent gap that is bent at a right angle. Can strengthen the capacitive coupling.
- the impedance can be adjusted by changing the height and width of the slit 422s provided to form the feeding conductor 422 in a strip shape.
- the base has a rectangular parallelepiped shape, but this point is not essential in the present invention. Therefore, the base may be a cube shape or a cylindrical shape. Moreover, the taper for specifying the direction may be provided in the corner
- a dielectric is used as the material of the substrate, but a magnetic material having dielectricity may be used in addition to the dielectric.
- a wavelength shortening effect of 1 / ⁇ ( ⁇ ⁇ ⁇ ) 1/2 ⁇ is obtained, a large wavelength shortening effect can be obtained by using a magnetic material having a high magnetic permeability ⁇ .
- the direction in which the radiation current Ia flows and the direction in which the feeding current Ib flows form an angle of 90 °.
- these angles are 90 °.
- each of the antenna devices according to the above embodiments includes the adjustment conductor 124, it is not essential to provide the adjustment conductor 124 in the present invention, and this may be omitted.
- the antenna devices according to the above embodiments are all inverted F antennas, it is not essential that the antenna device according to the present invention is an inverted F antenna, and other types may be used.
- FIG. 1 is a schematic perspective view showing a structure of an antenna device 100 according to a preferred first embodiment of the present invention.
- 2 is a development view of the antenna device 100.
- FIG. FIG. 6 is a schematic plan view showing enlarged shapes of a feeding conductor 122 and a coupling conductor 123. It is a schematic plan view which shows the pattern layout on the printed circuit board with which the antenna apparatus 100 is mounted.
- 1 is a schematic perspective view showing a state where an antenna device 100 is mounted on a printed circuit board 20.
- FIG. 3 is an equivalent circuit diagram of the antenna device 100 in a state where the antenna device 100 is mounted on the printed circuit board 20.
- FIG. 3 is a schematic plan view showing an example in which the antenna device 100 is mounted on an on-ground type printed circuit board 50 having a plurality of antenna mounting areas. It is a graph which shows the antenna characteristic of the antenna mounted in the antenna mounting area
- FIG. 4A and 4B are graphs showing a change in impedance characteristics of the antenna device when the land 33 is in a short state (see FIG. 4), where FIG. 5A is a Smith chart and FIG. It is a graph which shows the change of the impedance characteristic of the antenna apparatus when the land 33 is a floating state (refer FIG. 10), (a) is a Smith chart, (b) is a VSWR characteristic figure.
- FIG. 2 is a schematic perspective view which shows the structure of the antenna apparatus 400 by preferable 4th Embodiment of this invention.
- FIG. 4 is a development view of the antenna device 400.
- FIG. 5 is a schematic plan view showing enlarged shapes of a power supply conductor 422 and a coupling conductor 423.
- 10 is an enlarged schematic plan view showing a modification of the shapes of the power supply conductor 422 and the coupling conductor 423.
- FIG. It is a schematic perspective view which shows an example of a structure of the conventional antenna device. It is a schematic perspective view which shows the other example of a structure of the conventional antenna device.
- Antenna device 110 Base body 111 Upper surface 111 Base bottom surface 112 to 116 Base body Side surface 121 Radiation conductor 121a Radiation conductor end 121b Radiation conductor other end 122 Feed conductor 122a Feed conductor end 122b Feed conductor other end 122c Feed conductor coupling portion 122s Slit 123 Coupling conductor 124 Adjustment conductor 129 Switching means 200 Antenna device 300 Antenna device 400 Antenna device 422 Feed conductor 422a Feed conductor one end 422b Feed conductor other end 422c Feed conductor coupling portion 422s Slit 423 For coupling Body C1, C2 capacitance g gap Ia emission current Ib feed current Ic induced current M trans
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Abstract
Description
21 アンテナ実装領域
22 グランドパターン
31~34 ランド
41 給電ライン
42 調整用素子
50 プリント基板
51,52 アンテナ実装領域
53 グランドパターン
100 アンテナ装置
110 基体
111 基体の上面
111 基体の底面
112~116 基体の側面
121 放射導体
121a 放射導体の一端
121b 放射導体の他端
122 給電導体
122a 給電導体の一端
122b 給電導体の他端
122c 給電導体の結合部
122s スリット
123 結合用導体
124 調整用導体
129 スイッチング手段
200 アンテナ装置
300 アンテナ装置
400 アンテナ装置
422 給電導体
422a 給電導体の一端
422b 給電導体の他端
422c 給電導体の結合部
422s スリット
423 結合用導体
C1,C2 キャパシタンス
g ギャップ
Ia 放射電流
Ib 給電電流
Ic 誘導電流
M トランス
Claims (12)
- 誘電体又は磁性体からなる基体と、前記基体に形成された導体パターンとを備え、
前記導体パターンは、放射導体と、略U字状の給電導体と、前記放射導体の一端に接続され且つ前記給電導体と電磁結合された結合用導体とを備え、
前記給電導体及び前記結合用導体は、前記放射導体が形成された面とは異なる面に形成された導体パターンであり、
前記放射導体に流れる放射電流の方向と、前記給電導体に流れる給電電流の方向が互いに異なっていることを特徴とするアンテナ装置。 - 前記給電導体の一端は給電ラインに接続され、前記給電導体の他端は接地されていることを特徴とする請求項1に記載のアンテナ装置。
- 前記給電導体の一端は給電ラインに接続され、前記給電導体の他端は開放されていることを特徴とする請求項1に記載のアンテナ装置。
- 前記給電導体の一端は給電ラインに接続され、
前記給電導体の他端はスイッチング手段を介して接地又は開放されることを特徴とする請求項1に記載のアンテナ装置。 - 前記放射電流が流れる方向と前記給電電流が流れる方向は、ほぼ直交していることを特徴とする請求項1乃至4のいずれか一項に記載のアンテナ装置。
- 前記基体はほぼ直方体であり、前記放射導体の少なくとも一部は前記基体の上面に形成されており、前記給電導体及び前記結合用導体は、前記基体の長手方向と直交する第1の側面に形成されていることを特徴とすることを特徴とする請求項1乃至5のいずれか一項に記載のアンテナ装置。
- 前記基体に形成された前記導体パターンは、所定の基準面を中心にして左右対称であることを特徴とする請求項1乃至6のいずれか一項に記載のアンテナ装置。
- 前記給電導体の略U字部分は、緩やかにカーブした湾曲形状であることを特徴とする請求項1乃至7のいずれか一項に記載のアンテナ装置。
- 前記給電導体の略U字部分は、直角に折れ曲がった屈曲形状であることを特徴とする請求項1乃至7のいずれか一項に記載のアンテナ装置。
- プリント基板と、前記プリント基板に搭載された請求項1乃至7のいずれか一項に記載のアンテナ装置とを備えることを特徴とする無線通信機。
- 前記プリント基板はグランドパターンを有し、前記放射導体の他端は、前記プリント基板上の前記グランドパターンに接続されていることを特徴とする請求項10に記載の無線通信機。
- 前記プリント基板は、前記アンテナ装置が搭載されたアンテナ実装領域をさらに有し、前記アンテナ実装領域は、前記グランドパターンによって少なくとも2方向から囲まれていることを特徴とする請求項10又は11に記載の無線通信機。
Priority Applications (4)
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CN2008801215094A CN101904050B (zh) | 2007-12-21 | 2008-12-17 | 天线装置及使用该天线装置的无线通信机 |
US12/809,856 US8253631B2 (en) | 2007-12-21 | 2008-12-17 | Antenna device and wireless communication equipment using the same |
JP2009547054A JP5333235B2 (ja) | 2007-12-21 | 2008-12-17 | アンテナ装置及びこれを用いた無線通信機 |
EP08863827A EP2237370A1 (en) | 2007-12-21 | 2008-12-17 | Antenna device and wireless communication device using the same |
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JP2007-330581 | 2007-12-21 | ||
JP2007330581 | 2007-12-21 |
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PCT/JP2008/072912 WO2009081803A1 (ja) | 2007-12-21 | 2008-12-17 | アンテナ装置及びこれを用いた無線通信機 |
Country Status (5)
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US (1) | US8253631B2 (ja) |
EP (1) | EP2237370A1 (ja) |
JP (1) | JP5333235B2 (ja) |
CN (1) | CN101904050B (ja) |
WO (1) | WO2009081803A1 (ja) |
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WO2011125707A1 (ja) * | 2010-04-01 | 2011-10-13 | Tdk株式会社 | アンテナ装置及びこれを用いた無線通信機 |
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US10644403B2 (en) | 2017-08-29 | 2020-05-05 | Samsung Electro-Mechanics Co., Ltd. | Chip antenna and manufacturing method thereof |
US10305453B2 (en) * | 2017-09-11 | 2019-05-28 | Apple Inc. | Electronic device antennas having multiple operating modes |
JP6658704B2 (ja) * | 2017-09-20 | 2020-03-04 | Tdk株式会社 | アンテナモジュール |
JP6678723B1 (ja) * | 2018-10-31 | 2020-04-08 | 京セラ株式会社 | アンテナ、無線通信モジュール及び無線通信機器 |
JP2022518481A (ja) | 2019-01-22 | 2022-03-15 | 東友ファインケム株式会社 | アンテナ構造体及びそれを含むディスプレイ装置 |
KR102176860B1 (ko) * | 2019-01-22 | 2020-11-10 | 동우 화인켐 주식회사 | 안테나 구조체 및 이를 포함하는 디스플레이 장치 |
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Also Published As
Publication number | Publication date |
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US20110001672A1 (en) | 2011-01-06 |
JP5333235B2 (ja) | 2013-11-06 |
JPWO2009081803A1 (ja) | 2011-05-06 |
CN101904050B (zh) | 2013-01-30 |
US8253631B2 (en) | 2012-08-28 |
EP2237370A1 (en) | 2010-10-06 |
CN101904050A (zh) | 2010-12-01 |
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