WO2007020728A1 - Structure d'antenne et appareil de communication sans fil muni de celle-ci - Google Patents

Structure d'antenne et appareil de communication sans fil muni de celle-ci Download PDF

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Publication number
WO2007020728A1
WO2007020728A1 PCT/JP2006/304620 JP2006304620W WO2007020728A1 WO 2007020728 A1 WO2007020728 A1 WO 2007020728A1 JP 2006304620 W JP2006304620 W JP 2006304620W WO 2007020728 A1 WO2007020728 A1 WO 2007020728A1
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WO
WIPO (PCT)
Prior art keywords
frequency band
radiation electrode
low frequency
antenna
high frequency
Prior art date
Application number
PCT/JP2006/304620
Other languages
English (en)
Japanese (ja)
Inventor
Nobuhito Tsubaki
Kazunari Kawahata
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Priority to JP2007530912A priority Critical patent/JP4508242B2/ja
Publication of WO2007020728A1 publication Critical patent/WO2007020728A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • 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

Definitions

  • Antenna structure and wireless communication apparatus including the same
  • the present invention relates to an antenna structure for performing wireless communication in a low frequency band and wireless communication in a high frequency band, and a wireless communication apparatus including the antenna structure.
  • a wireless communication device having both a wireless communication function using a high frequency band and a wireless communication function using a low frequency band.
  • wireless communication of signals such as voice signals for calls and data signals such as video and text information is performed in a high frequency band such as about 800 MHz or more.
  • a mobile phone is provided with a wireless communication function for a wireless ID system (RF—ID system), for example.
  • RFID system wireless ID system
  • wireless communication is performed in a low frequency band of about 13.56 MHz.
  • a portable telephone that can support a wireless ID system has both a wireless communication function in a high frequency band and a wireless communication function in a low frequency band.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 11 345518
  • Patent Document 2 JP 2000-339437 A
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2004-173308
  • an antenna 30 for a high frequency band as shown in Fig. 20a is provided, and for example, a pick-up coil or the like.
  • An antenna for the low frequency band that also has power is provided.
  • An antenna 30 for a high frequency band shown in FIG. 20a has a state in which a radiation electrode 31 capable of performing an antenna operation at a resonance frequency in a high frequency band is provided on a dielectric substrate 32. is there. From the viewpoint of improving antenna characteristics, this high-frequency band antenna 30 has a circuit board edge that avoids the mounting area of other parts of the circuit board 34 provided in the mobile phone 33 as shown in FIG. 20b, for example. Provided in the section. [0006] Furthermore, the antenna for the low frequency band is constituted by a film-like spiral electrode 35 formed on the circuit board 34 as shown in FIG. 20b, for example. Since the spiral electrode 35 performs an antenna operation with a resonance frequency in the low frequency band, the spiral electrode 35 has a radiation electrode 31 for the high frequency band in order to have a resonance frequency in the low frequency band. Compared to, it is easy to enlarge.
  • the spiral electrode 35 for the low frequency band is required to be miniaturized.
  • a reduction in the formation area of the antenna (radiating electrode) is also required.
  • the mobile phone 33 is a folding type, as shown in the schematic side view of FIG. 20c, when the mobile phone 33 is folded, another circuit board 34 is provided on one side of the circuit board 34.
  • the circuit board 36 will be arranged. Since the other circuit board 36 is provided with components such as a liquid crystal panel 37, for example, the components of the circuit board 36 block the magnetic field generated from the spiral electrode 35 for the low frequency band and increase the antenna sensitivity. Deteriorate.
  • the spiral electrode 35 for the low frequency band has a problem that the antenna sensitivity on the circuit board 36 side is significantly worse than that of the spiral electrode 35.
  • the present invention has the following configuration as means for solving the above problems.
  • the antenna structure of the present invention is
  • a radiation electrode for a high frequency band that performs antenna operation with a resonance frequency of the high frequency band, and a base on which the radiation electrode for the high frequency band is provided,
  • a low frequency band antenna component equipped with a coil that functions as a radiation electrode for the low frequency band that performs antenna operation with a resonance frequency in the low frequency band.
  • the radiating electrode for the high frequency band is formed on the base body so as to avoid the base part through which the high magnetic field of the magnetic flux density of the coil center portion of the low frequency band antenna component passes. It is characterized by being composed of a mixed material including a dielectric material and a magnetic material.
  • the substrate is also characterized by being composed of a mixed material including a dielectric material and a magnetic material.
  • the antenna structure of the present invention includes:
  • An antenna structure in which a substrate including a radiation electrode for a high frequency band that performs antenna operation at a resonance frequency of a high frequency band is mounted on a printed circuit board,
  • a coiled radiation electrode for a low frequency band that performs an antenna operation with a resonance frequency in a low frequency band is formed in the printed circuit board area on which the substrate is mounted.
  • the base having the radiation electrode for the high frequency band is laminated on the upper side.
  • the high frequency band radiation electrode is formed on the base body avoiding the high magnetic field of the magnetic flux density at the center of the coil of the coiled low frequency band radiation electrode.
  • the substrate is characterized in that it is made of a mixed material including a dielectric material and a magnetic material.
  • the wireless communication apparatus of the present invention is characterized in that an antenna structure having a configuration unique to the present invention is provided.
  • the base on which the radiation electrode for the high frequency band is formed is made of a mixed material including a dielectric material and a magnetic material.
  • the dielectric material of the mixed material constituting the substrate has a specific dielectric constant almost constant regardless of the frequency. Have sex.
  • magnetic materials have a high relative permeability for frequencies in the low frequency band, and are low for frequencies in the high frequency band, for example, a relative permeability (for example, close to approximately 1, relative permeability). It has something. The inventor paid attention to the characteristics of the magnetic material.
  • the base made of the mixed material containing the dielectric material and the magnetic material is In the low frequency band, it can be treated as a magnetic material (although the characteristics of the dielectric material are not weakened) due to the magnetic permeability of the magnetic material.
  • the magnetic material has a magnetic permeability of almost 1 in the high-frequency band, so it can be handled as a dielectric.
  • the base material behaves as a magnetic base material with a stronger characteristic based on the relative magnetic permeability of the magnetic material than the relative dielectric constant of the dielectric material for frequencies in the low frequency band.
  • the substrate behaves as a dielectric substrate for a frequency in a high frequency band because the characteristics based on the relative permittivity of the dielectric material are stronger than the relative permeability of the magnetic material.
  • the substrate constituting the antenna structure of the present invention can have the above-mentioned specific characteristics by being composed of a mixed material including a dielectric material and a magnetic material.
  • the radiation electrode for the low frequency band is formed in a space disposed in the absence of the base part, or is formed on the base body together with the radiation electrode for the high frequency band. Or is formed in a substrate mounting area of a printed circuit board on which the substrate is mounted. In other words, the substrate is arranged in a part of the path of the magnetic field generated from the radiation electrode for the low frequency band.
  • the base can be configured to behave as a magnetic substrate for frequencies in the low frequency band, so that part of the magnetic field of the radiation electrode for the low frequency band passes through the magnetic material. It can be.
  • the substrate on which the radiation electrode for the high frequency band is formed can be provided with the small radiation electrode for the low frequency band, A radiation electrode for a low frequency band can be disposed so as to be within the mounting region of the substrate. Thereby, for example, the formation area of the radiation electrode for the low frequency band in the circuit board of the wireless communication device can be reduced.
  • a radiation electrode for a low frequency band can be disposed at the edge of the circuit board built in the line communication device.
  • the radiation electrode for the low frequency band By arranging the radiation electrode for the low frequency band at the edge part of the circuit board, the magnetic field generated by the components mounted on the circuit board out of the magnetic field generated by the radiation electrode cover for the low frequency band. Decrease. As a result, the antenna sensitivity of the radiation electrode for the low frequency band can be improved.
  • the high frequency band is designed for the low frequency band by having a structure that is formed on the substrate avoiding the base part through which the magnetic field with high magnetic flux density passes through the center of the coil of the radiation electrode for the low frequency band. Magnetic field force with a high magnetic flux density of the radiation electrode The situation of being blocked by the radiation electrode for the high frequency band can be avoided. As a result, the radiation electrode for the low frequency band and the radiation electrode for the high frequency band are arranged close to each other! Therefore, it is possible to suppress the deterioration of the antenna characteristics of the radiation electrode for the low frequency band.
  • the wireless communication device can be downsized by downsizing the antenna structure.
  • the antenna structure of the present invention is provided at the edge portion of the circuit board, so that the low frequency band is provided.
  • the magnetic field blocked by the circuit board components can be reduced.
  • the direction of good antenna sensitivity of the radiation electrode for the low frequency band can be expanded.
  • FIG. 1 is a model diagram for explaining an antenna structure of a first embodiment.
  • FIG. 2 is a graph for explaining an example of frequency characteristics of relative permittivity of a dielectric material and frequency characteristics of relative permeability of a magnetic material.
  • FIG. 3a is a model diagram showing a configuration example of an antenna component for a low frequency band.
  • FIG. 3b is a model diagram showing another configuration example of the antenna component for the low frequency band.
  • FIG. 3c is a model diagram showing still another configuration example of the antenna component for low frequency band.
  • [4a] It is an exploded view for explaining a configuration example of the antenna component for the low frequency band shown in FIG. 4b.
  • FIG. 4b is a model diagram showing another configuration example of the antenna component for the low frequency band.
  • FIG. 5a is a model diagram showing another configuration example of the antenna component for the low frequency band.
  • FIG. 5b is a model diagram showing another configuration example of the antenna component for the low frequency band.
  • FIG. 6 Furthermore, it is a model diagram showing another configuration example of the antenna component for the low frequency band.
  • ⁇ 7 A diagram for explaining one of the obtained effects of the antenna structural force of the first embodiment.
  • FIG. 8 is a model diagram showing another arrangement example of antenna components for low frequency band.
  • FIG. 9 is a model diagram showing an example of another arrangement posture of antenna components for low frequency band.
  • FIG. 10a is a diagram for explaining another example of the radiation electrode for the high frequency band.
  • FIG. 10b is a cross-sectional side view of the high-frequency band radiation electrode shown in FIG. 10a.
  • [11a] It is a diagram for explaining the antenna structure of the second embodiment.
  • [11] ib] is a model diagram showing an example of a substrate constituting the antenna structure of the second embodiment.
  • FIG. 11c is a model diagram showing another embodiment of the base body constituting the antenna structure of the second embodiment.
  • [Lid] is a model diagram showing still another embodiment of the substrate constituting the antenna structure of the second embodiment.
  • FIG. 12 is a diagram for explaining an antenna structure of a third embodiment.
  • 13a is a model diagram showing an example of the shape of the hole for lowering the effective magnetic permeability in the region where the radiation electrode for the high frequency band is formed on the substrate.
  • 13b] is a model diagram showing another example of the shape of the hole for lowering the effective magnetic permeability of the region where the radiation electrode for the high frequency band is formed on the base.
  • FIG. 13c A model diagram showing still another example of the shape of the hole for lowering the effective magnetic permeability of the formation region of the radiation electrode for the high frequency band in the base.
  • FIG. 13D is a model diagram showing still another embodiment of the hole for lowering the effective permeability of the formation region of the radiation electrode for the high frequency band in the base.
  • FIG. 14a is a model diagram showing a modification of the antenna structure shown in FIG.
  • FIG. 14b is a model diagram showing another modification of the antenna structure shown in FIG. [15a] This is a model diagram showing an example of an inverted F-type radiation electrode for a high-frequency band.
  • FIG. 16a is a model diagram showing an example of a line-shaped high-frequency band radiation electrode.
  • ⁇ 16b] is a model diagram showing another form of the radiation electrode for the line-shaped high frequency band.
  • ⁇ 17] is a diagram for explaining the antenna structure of the fourth embodiment.
  • FIG. 18 is a drawing for explaining the antenna structure of the fifth embodiment.
  • FIG. 19a is a diagram for explaining another embodiment.
  • FIG. 19b is a diagram for explaining still another embodiment.
  • FIG. 20a is a diagram for explaining a conventional problem.
  • FIG. 20b is a diagram for explaining the conventional problem together with FIG. 20a.
  • FIG. 20c is a diagram for explaining a conventional problem together with FIGS. 20a and 20b.
  • FIG. 1 shows a schematic perspective view of the antenna structure of the first embodiment.
  • the antenna structure 1 of the first embodiment includes a substrate 3 mounted on a circuit board 2 that is a printed circuit board, and a high frequency band radiation electrode 4 (4A, 4B) that performs antenna operation at a resonance frequency of the high frequency band. And a low-frequency band antenna component 5 having a radiation electrode that performs antenna operation with a resonance frequency in a low-frequency band.
  • the base body 3 has an aspect in which a rectangular parallelepiped bottom surface side is partially absent to form a cross-sectional shape and a square shape.
  • the substrate 3 is made of a mixed material in which a dielectric material and a magnetic material are mixed with a resin material.
  • the substrate 3 is produced by a molding technique such as injection molding. Since the base body 3 is produced by the molding technique, the base body 3 can be easily manufactured.
  • the dielectric material has a characteristic that the relative dielectric constant is constant regardless of the change in frequency.
  • the magnetic material has a high saturation state that gradually increases as the frequency decreases with respect to the low frequency band.
  • the magnetic material has a substantially stable low relative permeability (for example, a relative permeability of about 1) that gradually decreases as the frequency increases with respect to the frequency in the high frequency band.
  • the relative permeability rapidly decreases as the frequency increases within the frequency range between the low frequency band having a high relative permeability and the high frequency band having a low relative permeability. It has a characteristic part with an inflection point.
  • the substrate 3 is configured with attention paid to the characteristics of the magnetic material described above.
  • a dielectric material or a magnetic material is selected as a constituent material of the base 3, and a mixing ratio of the dielectric material and the magnetic material is set.
  • the low frequency band antenna component 5 is based on the relative permeability of the magnetic material rather than the relative dielectric constant of the dielectric material for frequencies in the low frequency band including the resonance frequency (for example, 13.56 MHz) at which the antenna operates.
  • the characteristics are so strong that the substrate 3 behaves as a magnetic substrate.
  • the high frequency band radiation electrode 4 (4A, 4B) has a high frequency band including a resonance frequency (for example, a frequency of 800 MHz or more) at which the antenna operation is performed.
  • a resonance frequency for example, a frequency of 800 MHz or more
  • the characteristics based on the relative permittivity of the dielectric material are stronger than the relative permeability of the magnetic material, and the substrate 3 behaves as a dielectric substrate.
  • the substrate 3 can behave as a magnetic substrate for such a low frequency band frequency, and can behave as a dielectric substrate for a high frequency band frequency.
  • a dielectric material, a magnetic material, and a mixing ratio of the dielectric material and the magnetic material are set.
  • the base body 3 has a form in which a part on the bottom side is partially absent, and a space 6 is formed in the lack part.
  • the base body 3 is mounted on an edge portion on one end side of the circuit board 2 in such a posture that the space 6 is on the circuit board 2 side.
  • the antenna component 5 for the low frequency band is provided on the circuit board 2 so as to be disposed in the space 6 formed in the lacking portion of the base 3.
  • the antenna component 5 for low frequency band is used in a radio communication system using a low frequency band such as a radio ID system.
  • the low-frequency band antenna component 5 includes a coil that functions as a radiation electrode for a low-frequency band that performs an antenna operation with a predetermined resonance frequency in the low-frequency band.
  • the antenna component 5 for low frequency band has a small size that can be placed in the space 6 of the base 3 and performs antenna operation at the set resonance frequency.
  • the configuration is not particularly limited, and can take various forms.
  • the low-frequency band antenna component 5 may have a configuration in which a coil pattern 11 as a low-frequency band radiation electrode is formed on the upper surface of the magnetic substrate 10, as shown in FIG. 3a.
  • the low-frequency band antenna component 5 may have a configuration in which a coil pattern 11 as a low-frequency band radiation electrode is formed across a plurality of surfaces of the magnetic substrate 10. Good.
  • a coil pattern 11 as a radiation electrode for the low frequency band is formed on the upper surface of the magnetic substrate 10, and an upper side of the coil pattern 11 is formed.
  • a configuration in which the dielectric film 12 is laminated and formed.
  • the coil pattern 13 as shown in Fig. 4a and the magnetic layer are alternately stacked, and as shown in Fig. 4b, Integrated It may be configured as described above.
  • the plurality of coil patterns 13 are electrically connected in series by via holes formed in the magnetic layer to constitute one coil.
  • the low frequency band antenna component 5 may have a configuration in which the conductive wire 14 is wound in a coil shape, as shown in FIG. 5a. Further, as shown in FIG. 5b, the low-frequency band antenna component 5 has a configuration in which a core 15 having a magnetic material force such as ferrite is arranged at the center of a coil formed by winding a conductive wire 14 in a coil shape. It is good. Furthermore, the low frequency band antenna component 5 may have a configuration in which a conducting wire 17 is formed on the circumferential surface of the magnetic substrate 16 as shown in FIG.
  • any of the various configurations as described above may be adopted as the configuration of the antenna component 5 for the low frequency band.
  • the antenna component 5 for low frequency band is such that the magnetic field having a high magnetic flux density at the center of the coil of the antenna component 5 for low frequency band is substantially orthogonal to the substrate surface of the circuit board 2 and the upper surface of the substrate 3. It is fixed to the circuit board 2 with its posture.
  • the radiation electrode 4 for the high frequency band can be used for a radio communication system using a high frequency band such as a radio communication of an audio signal or a data signal of a mobile phone. is there.
  • the radiation electrode 4 for the high frequency band can perform an antenna operation at a predetermined resonance frequency in the high frequency band, and a magnetic field having a high magnetic flux density at the center of the coil of the antenna component 5 for the low frequency band.
  • the configuration is not particularly limited as long as the configuration is formed in the upper surface region of the substrate that avoids the passing portion, but an example of the configuration is shown in FIG.
  • the radiation electrode 4 for the high frequency band includes a power supply radiation electrode 4A and a parasitic radiation electrode 4B.
  • Radiation electrodes 4A and 4B are ⁇ Z4 type radiation electrodes.
  • the feed radiation electrode 4 ⁇ ⁇ ⁇ is connected to a radio communication high frequency circuit 18 provided in a radio communication device, for example, and performs an antenna operation.
  • the parasitic radiation electrode 4 ⁇ is electromagnetically coupled to the feeding radiation electrode 4 ⁇ and resonates with the resonance operation of the feeding radiation electrode 4 ⁇ to create a double resonance state.
  • the feed radiation electrode 4 ⁇ ⁇ and the non-feed radiation electrode 4 ⁇ are formed so that a double resonance state can be created, thereby utilizing the effect of widening the frequency band and different frequency bands.
  • the effect of being able to support multiple wireless communication systems and the antenna gain Improvement effects and the like can be obtained.
  • the base 3 is made of a mixed material including a dielectric material and a magnetic material.
  • the substrate 3 is configured to behave as a magnetic substrate for frequencies in the low frequency band and to behave as a dielectric substrate for frequencies in the high frequency band. That is, the substrate 3 is a dielectric substrate when viewed from the radiation electrode 4 for the high frequency band, and is a magnetic substrate when viewed from the antenna component 5 for the low frequency band.
  • the low frequency band antenna component 5 is arranged so that a magnetic field having a high magnetic flux density in the center of the coil of the low frequency band antenna component 5 passes through the base 3.
  • the antenna component 5 for low frequency band can be downsized by the wavelength shortening effect of the magnetic material.
  • the antenna component 5 for low frequency band can also be mounted in the mounting region of the substrate 3 on the circuit board 2. As a result, the antenna mounting area required for mounting the antenna on the circuit board 2 can be reduced.
  • the high-frequency band radiation electrode 4 (4A, 4B) avoids a portion through which a magnetic field having a high magnetic flux density passes at the center of the coil of the low-frequency band antenna component 5. It is formed. Therefore, it is possible to prevent the magnetic field (radio wave) of the antenna component 5 for the low frequency band from being disturbed by the radiation electrode 4 for the high frequency band. For this reason, it is possible to suppress bad antenna characteristics of the antenna component 5 for the low frequency band due to the close arrangement of the radiation electrode 4 for the high frequency band.
  • the antenna structure 1 By placing the antenna structure 1 at the edge of the circuit board that avoids the mounting area of the circuit component on the circuit board 2, the antenna component 5 for the low frequency band is Compared with the case where it is mounted on a portion other than the edge portion, the directivity of the magnetic field (radio wave) radiation of the antenna component 5 for the low frequency band can be expanded.
  • the antenna structure 1 in the first embodiment is provided in a foldable portable telephone
  • the antenna structure 1 is provided at the edge portion of the circuit board 2 as shown in the side view of FIG.
  • the magnetic field of the antenna component 5 for the low frequency band can spread in the vertical direction in FIG. 7 without being blocked by the component 20 such as a liquid crystal panel.
  • the antenna sensitivity of the antenna component 5 for low frequency band can be improved.
  • the antenna component 5 for the low frequency band is within the mounting region of the base 3 on the circuit board 2, and the circuit of the circuit board 2, the radiation electrode 4 for the high frequency band, and the antenna component 5 for the low frequency band.
  • the location of the antenna component 5 for the low frequency band which is arranged at an appropriate position in consideration of the configuration of the wiring connecting the radiating electrode and the configuration of the radiation electrode 4 for the high frequency band, etc., is the position shown in FIG. It is not limited to.
  • the antenna component 5 for low frequency band may be arranged so that a magnetic flux having a high magnetic flux density in the center of the coil passes through the corner of the base 3.
  • the low frequency band antenna component 5 has a posture in which a magnetic field having a high magnetic flux density at the center of the coil of the component 5 is substantially orthogonal to the substrate surface of the circuit board 2 and the upper surface of the substrate 3.
  • the antenna component 5 for the low frequency band has a magnetic field with a high magnetic flux density at the center of the coil so that it substantially follows the board surface of the circuit board 2 and the upper surface of the base 3. You may arrange
  • the radiation electrode 4 for the high frequency band is formed on the upper surface of the substrate 3, the restriction of the formation region of the radiation electrode 4 for the high frequency band by the antenna component 5 for the low frequency band is relaxed. As a result, the degree of freedom in designing the radiation electrode 4 for the high frequency band can be increased.
  • the base body 3 is configured to have a cross-sectional force-fitting shape.
  • the base body 3 has a recess 21 on the bottom surface side.
  • a space portion for accommodating the antenna component 5 for the low frequency band may be provided.
  • the antenna structure 1 may be configured as shown in the perspective view of FIG. 10a and the sectional side view of FIG. 10b. That is, in the antenna structure 1, the radiation electrode 4 (4A, 4B) has a loop shape. That is, the radiation electrode 4 (4A, 4B) is formed to extend from the edge of the circuit board 2 to the outer region of the circuit board 2 while bulging downward from the circuit board 2, and then the end surface of the circuit board 2 with a space therebetween.
  • the circuit board 2 is formed to wrap around and extend to the upper surface side of the circuit board 2, and the extended distal end side is arranged on the upper surface of the circuit board 2 with a gap.
  • a base 3 made of a mixed material including a dielectric material and a magnetic material is formed on a part of the radiation electrode 4 (4A, 4B). Also, mounting the base 3 on the circuit board 2 In the region, the antenna component 5 for the low frequency band is arranged in a portion that cannot be seen as a shadow of the radiation electrode 4 in FIG. 10a.
  • the second embodiment is characterized by the form of the substrate 3.
  • the other configuration of the antenna structure 1 is the same as that of the first embodiment. That is, from the viewpoint of improving the antenna characteristics of the low-frequency band antenna component 5, the thickness of the portion of the base 3 through which the magnetic field having a high magnetic flux density at the center of the coil of the low-frequency band antenna component 5 passes is thick. Is preferred.
  • the substrate 3 is thin.
  • the base 3 has a thickness of the portion of the base 3 through which a magnetic field having a high magnetic flux density in the center part of the coil of the low frequency band antenna component 5 passes. It has a form that is thicker than the average thickness of the region where the radiation electrode 4 is formed.
  • the low-frequency band antenna component 5 is positioned in the position of the circuit board 2 as shown in Fig. 11a (that is, the circuit in the predetermined substrate mounting region in the circuit board 2).
  • the base 3 may take a form as shown in FIGS. That is, in the example of FIG. 11a, the base 3 is continuously thickened according to the direction force from one side 3b to the other side 3a of the opposing edge portions 3a, 3b, and the top surface of the base is relative to the bottom surface of the base. It is formed in a form that tilts and rises.
  • the substrate 3 is mounted on the edge portion of the circuit board 2 so that the thin portion is disposed on the edge portion on one end side of the circuit board 2 and the thick portion is disposed on the arrangement side of the antenna component 5 for the low frequency band. It is done.
  • a recess (not shown) is provided on the bottom surface side of the base 3 for forming a space for accommodating and arranging the antenna component 5 for low frequency band.
  • the substrate 3 has a substantially hill-like form.
  • a concave portion (not shown) for forming a space for accommodating and arranging the antenna component 5 for low frequency band is provided on the bottom surface side of the portion where the thickness of the base 3 is the thickest.
  • the base 3 protrudes from the region where the low frequency band antenna component 5 is disposed.
  • the portion 22 is formed so that the thickness of the base portion is increased.
  • a recess (not shown) for forming a space for accommodating and arranging the low frequency band antenna component 5 is provided on the bottom surface side of the portion where the thickness of the base 3 is increased.
  • the base 3 is hollow in the area avoiding the area where the low-frequency band antenna component 5 is disposed, and the base in the area where the low-frequency band antenna component 5 is disposed The thickness of the part has increased substantially.
  • a recess (not shown) for forming a space for accommodating and arranging the low-frequency band antenna component 5 is provided on the bottom surface side of the substrate in the region where the low-frequency band antenna component 5 is disposed.
  • the base 3 has a configuration in which the magnetic flux density at the center of the coil of the antenna component 5 for low frequency band is high and the thickness of the portion through which the magnetic field passes can be increased. .
  • the length of the base portion that is, the magnetic base portion
  • the effect of shortening the wavelength by the magnetic material is increased, so that it is possible to further reduce the size of the low-frequency band antenna component 5 and improve the antenna sensitivity.
  • the base portion of the formation region of the radiation electrode 4 for the high frequency band can be made thin, the magnetic material loss of the radiation electrode 4 for the high frequency band due to the magnetic material of the base body 3 can be reduced. Thereby, the antenna characteristics of the radiation electrode 4 for the high frequency band can be improved.
  • the base portion where the radiation electrode 4 for the high-frequency band is formed is made thin, Due to this configuration, there is a concern that the wavelength shortening effect of the substrate 3 on the radiation electrode 4 for the high frequency band is reduced.
  • a dielectric material having a high relative dielectric constant is used as the dielectric material contained in the base 3. I prefer to take measures.
  • a third embodiment will be described below.
  • the same components as those in the first and second embodiments are denoted by the same reference numerals, and overlapping description of the common portions is omitted.
  • both the high frequency band radiation electrode 4 (4A, 4B) and the low frequency band radiation electrode 25 are provided on the substrate 3. Yes. That is,
  • the substrate 3 is made of a mixed material containing a dielectric material and a magnetic material, as in the first and second embodiments.
  • a radiation electrode 4 for a high frequency band having a feed radiation electrode 4A and a parasitic radiation electrode 4B is formed in the left region of FIG. 12 on the upper surface of the substrate 3.
  • a radiation electrode (coil electrode) 25 for a low frequency band made up of a coil pattern cover and a radiation electrode 4 for a high frequency band is formed.
  • the structure of the antenna structure 1 other than these structures is the same as in the first and second embodiments.
  • both the high-frequency band radiation electrode 4 and the low-frequency band radiation electrode 25 are provided on a common base 3 to form a single component.
  • the base 3 provided with both the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band is simply disposed in the mounting region of the setting of the circuit board 2 of the wireless communication device.
  • the antenna structure 1 can be provided on the circuit board 2. Thereby, for example, the manufacturing process of the wireless communication device can be simplified.
  • a configuration in which the effective permeability of the base portion on which the radiation electrode 4 for the high frequency band is formed may be provided.
  • a hole portion (or a hollow portion) 26 for reducing the effective magnetic permeability is provided in the base portion where the radiation electrode 4 for the high frequency band is formed. That is, in the example of FIG. 13a, a recess (having openings on both the front end face and the rear end face shown in FIG.
  • Groove (hole)) 26 is provided.
  • FIG. 13b a hole (through hole) 26 penetrating from the front end surface side to the rear end surface side of the substrate 3 shown in FIG. It has been.
  • FIG. 13c a hole portion 26 having an opening on the left side surface shown in FIG. 13c of the base 3 is provided in the base portion where the radiation electrode 4 for the high frequency band is formed.
  • a recess (hole (recessed portion)) 26 having an opening is formed on the bottom surface of the base portion where the radiation electrode 4 for the high frequency band is formed.
  • the hole 26 is formed in the base portion where the radiation electrode 4 for the high frequency band is formed.
  • a configuration may be provided in which the magnetic permeability of the radiation electrode 4 for the high frequency band is reduced by lowering the effective permeability of the base portion on which the radiation electrode 4 for the wave band is formed.
  • a step is provided on the upper surface of the base 3 so that the formation region of the high-frequency band radiation electrode 4 on the upper surface of the base 3 is lower than the formation region of the low-frequency band radiation electrode 25.
  • the thickness of the portion of the base 3 where the radiation electrode 4 for the high frequency band is formed may be thinner than the portion of the base 3 where the radiation electrode 25 for the low frequency band is formed.
  • both the high-frequency band radiation electrode 4 and the low-frequency band radiation electrode 25 are formed on the upper surface of the substrate 3.
  • the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band may be formed on different surfaces of the substrate 3, respectively.
  • the radiation electrode 4 for high frequency band is formed on the upper surface of the substrate 3
  • the radiation electrode 25 for low frequency band is formed on the side surface of the substrate 3. In this way, the size of the substrate 3 can be increased by adopting a configuration in which the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band are respectively formed on different surfaces of the substrate 3.
  • the electrode area of the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band can be increased.
  • the frequency band of the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band can be widened, and the antenna characteristics can be improved.
  • the radiation electrode 25 for the low frequency band is formed such that a magnetic field having a high magnetic flux density at the center of the coil of the radiation electrode 25 for the low frequency band is along the upper surface of the substrate 3.
  • the radiation electrode 4 for the high frequency band formed on the upper surface of the substrate 3 is designed so as not to worry about the path of the magnetic field having a high magnetic flux density at the center of the coil of the radiation electrode 25 for the low frequency band.
  • the design freedom of the radiation electrode 4 for the high frequency band can be increased.
  • one or both of the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band are formed over a plurality of surfaces of the substrate 3. It is good also as the structure which has. By providing this configuration, it is possible to increase the electrode area of the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band. As a result, the frequency band of the radiation electrode 4 for the high frequency band and the radiation electrode 25 for the low frequency band can be widened, and the antenna characteristics can be improved.
  • the radiation electrode 4 for the high frequency band is a force that was a ⁇ Z4 type radiation electrode.
  • the radiation electrode 4 for the high frequency band may be an inverted F type radiation electrode.
  • a linear radiation electrode as shown in FIG. 16a or FIG. 16b may be used.
  • the radiation electrode 25 for the low frequency band is formed on the upper surface of the substrate 3.
  • the radiation electrode for the low frequency band is formed by alternately laminating a coil pattern as shown in FIG. 4a and an insulating layer made of a mixed material including a dielectric material and a magnetic material. It is formed as a single unit.
  • the radiating electrode 4 for the high frequency band is formed on the base 3 made of a mixed material containing a dielectric material and a magnetic material. ing.
  • a coil-shaped radiation electrode 25 for a low frequency band is formed on a portion of the circuit board 2 on which the base 3 on which the radiation electrode 4 for the high frequency band is formed is mounted. That is, the base 3 having the high-frequency band radiation electrode 4 is laminated on the upper side of the low-frequency band radiation electrode 25 formed on the circuit board 2.
  • high frequency band radiation is avoided as much as possible by avoiding a base portion through which a magnetic field having a high magnetic flux density at the center of the coil of the radiation electrode 25 for low frequency band passes.
  • An electrode 4 is formed on the substrate 3.
  • a fifth embodiment will be described below.
  • the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and the overlapping description of the common portions is omitted. To do.
  • the radiation electrode 4 for the high frequency band is formed on the base 3 made of a mixed material containing a dielectric material and a magnetic material. ing.
  • the radiation electrode 25 for the low frequency band is formed on, for example, a film-like base body 27 having, for example, a resin material strength.
  • the base body 3 on which the high-frequency band radiation electrode 4 is formed and the base body 27 on which the low-frequency band radiation electrode 25 is formed are integrated into a single component.
  • the path of the magnetic field having a high magnetic flux density at the center of the coil of the radiation electrode 25 for the low frequency band is not obstructed.
  • the high-frequency band radiation electrode 4 is formed on the substrate 3 while avoiding the base portion through which a magnetic field having a high magnetic flux density passes through the center of the coil of the low-frequency band radiation electrode 25.
  • the force that the radiation electrode 25 for the low frequency band is formed on the upper surface of the base 27.
  • the radiation electrode 25 for the low frequency band includes a plurality of the base 27 It may be formed across the surface.
  • the low-frequency band radiation electrode 25 is formed on a substrate made of a magnetic material cover. It is good also as a structure to be.
  • a plurality of coil patterns constituting a low frequency band radiation electrode as shown in FIG. 4 are integrated with each other through a magnetic layer, and the low frequency band radiation electrode is formed inside the substrate. It may be in the form of being formed.
  • the radiation electrode for the low frequency band is the same as the antenna component 5 for the low frequency band as shown in the first embodiment, and the antenna component for the low frequency band is fixed to the base 27,
  • the base body 3 on which the high-frequency band radiation electrode 4 is formed may be laminated and integrated on the upper side of the base body 27 to which the frequency band antenna component 5 is fixed.
  • a space for accommodating the antenna component 5 for the low frequency band is formed on the bottom surface side of the base 3 without a part thereof.
  • the form of the radiation electrode for the low frequency band constituting the antenna structure 1 of the fifth embodiment is not particularly limited.
  • the sixth embodiment relates to a wireless communication apparatus.
  • the wireless communication device of this sixth embodiment has a wireless communication function in a low frequency band and a high frequency band. It has a configuration capable of performing both the wireless communication function and the wireless communication function.
  • any one of the antenna structures 1 shown in the first to fifth embodiments is provided. There are various configurations other than the antenna structure in the wireless communication apparatus, and here, any configuration may be adopted and the description thereof is omitted. In addition, since the description of the antenna structure 1 of the first to fifth embodiments has been described above, the overlapping description is omitted here.
  • the base 3 is composed of a mixed material in which a dielectric material and a magnetic material are mixed with a resin material.
  • the constituent material of the base 3 may be a mixed material including a dielectric material and a magnetic material.
  • it may be a mixed material of only a dielectric material and a magnetic material.
  • the high-frequency band radiation electrode 4 is formed on the base 3.
  • the high-frequency band radiation electrode 4 is formed.
  • the radiation electrode 4 may have a configuration in which a part of the radiation electrode 4 is drawn from the base 3 to the circuit board 2 which is a printed board.
  • the low frequency band antenna component 5 and the coiled radiation electrode 25 for the low frequency band are formed in the mounting region of the base 3 on the circuit board 2. Has been.
  • the radiation electrode 25 for the low frequency band is formed on the base 3
  • the radiation electrode 25 for the low frequency band is part of the circuit board 2 from the base 3 to the printed board.
  • the bow I is formed and the structure is as follows.
  • a dielectric film that covers at least a part of the radiation electrode 4 for the high frequency band may be provided.
  • the wavelength shortening effect by the dielectric increases, and the radiation electrode 4 for the high frequency band can be further downsized. it can.
  • the antenna for the low frequency band can be miniaturized when the antenna for the high frequency band and the antenna for the low frequency band are provided. For this reason, it is incorporated into wireless communication devices such as portable wireless communication devices that are required to be miniaturized. It is effective to apply the present invention to an antenna structure and a wireless communication apparatus.

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

Abstract

L'invention concerne une structure d'antenne qui est munie d'une électrode de rayonnement (4) pour une bande de fréquences hautes afin d'effectuer le fonctionnement d'une antenne à une fréquence de résonance de la bande de fréquences hautes, ainsi que d'un corps de base (3) sur lequel est disposée l'électrode de rayonnement (4). Le corps de base (3), par exemple, est monté sur une carte à circuit imprimé (2) et, dans une région sur laquelle est monté le corps de base (3), par exemple, est disposée une électrode de rayonnement de type bobine (5) destinée à une bande de fréquences basses. L'électrode de rayonnement (4) est formée sur le corps de base (3) à l'exception d'une partie du corps de base sur laquelle un champ magnétique présentant une densité élevée de flux magnétique passe au niveau d'une partie centrale de bobine de l'électrode de rayonnement (5). Le corps de base (3) est composé d'un matériau mixte incluant un matériau diélectrique et un matériau magnétique.
PCT/JP2006/304620 2005-08-12 2006-03-09 Structure d'antenne et appareil de communication sans fil muni de celle-ci WO2007020728A1 (fr)

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JP2007530912A JP4508242B2 (ja) 2005-08-12 2006-03-09 アンテナ構造およびそれを備えた無線通信装置

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JP2005-234666 2005-08-12
JP2005234666 2005-08-12

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WO2009011041A1 (fr) * 2007-07-18 2009-01-22 Fujitsu Limited Marqueur sans fil et procédé de fabrication du marqueur sans fil
JP2009033657A (ja) * 2007-07-30 2009-02-12 Tdk Corp 無線送信機
JP2009212923A (ja) * 2008-03-05 2009-09-17 Denso Corp 複合アンテナ、通信装置、および電子キーシステム
JP2011517914A (ja) * 2008-04-16 2011-06-16 ソニー エリクソン モバイル コミュニケーションズ， エービー アンテナアセンブリ
JP2012029258A (ja) * 2010-07-28 2012-02-09 Panasonic Corp アンテナ装置及びこれを備えた通信装置
JP2012039672A (ja) * 2011-11-24 2012-02-23 Panasonic Corp アンテナ、アンテナ装置及び通信装置
WO2012049473A3 (fr) * 2010-10-15 2012-12-13 Antenova Limited Antenne cadre pour combiné mobile et autres applications
JP2012532556A (ja) * 2009-07-06 2012-12-13 サムスン エレクトロニクス カンパニー リミテッド 無線電力送信システムおよびシステムのための共振器
JP2013236141A (ja) * 2012-05-07 2013-11-21 Hitachi Metals Ltd アンテナ装置
GB2501385B (en) * 2010-10-21 2015-05-27 Murata Manufacturing Co Communication terminal device
US9190711B2 (en) 2010-07-28 2015-11-17 Panasonic Intellectual Property Management Co., Ltd. Antenna device and communication apparatus including the same
JP6239176B1 (ja) * 2017-04-21 2017-11-29 株式会社Maruwa アンテナモジュール

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JPH0969717A (ja) * 1995-09-01 1997-03-11 Murata Mfg Co Ltd チップアンテナ
JPH09130112A (ja) * 1995-10-31 1997-05-16 Murata Mfg Co Ltd チップアンテナ
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JPWO2009011041A1 (ja) * 2007-07-18 2010-09-09 富士通株式会社 無線タグ及び無線タグの製造方法
WO2009011041A1 (fr) * 2007-07-18 2009-01-22 Fujitsu Limited Marqueur sans fil et procédé de fabrication du marqueur sans fil
US8493183B2 (en) 2007-07-18 2013-07-23 Fujitsu Limited Wireless tag and method for producing wireless tag
JP5018884B2 (ja) * 2007-07-18 2012-09-05 富士通株式会社 無線タグ及び無線タグの製造方法
JP2009033657A (ja) * 2007-07-30 2009-02-12 Tdk Corp 無線送信機
JP2009212923A (ja) * 2008-03-05 2009-09-17 Denso Corp 複合アンテナ、通信装置、および電子キーシステム
JP2011517914A (ja) * 2008-04-16 2011-06-16 ソニー エリクソン モバイル コミュニケーションズ， エービー アンテナアセンブリ
JP2012532556A (ja) * 2009-07-06 2012-12-13 サムスン エレクトロニクス カンパニー リミテッド 無線電力送信システムおよびシステムのための共振器
JP2012029258A (ja) * 2010-07-28 2012-02-09 Panasonic Corp アンテナ装置及びこれを備えた通信装置
US9190711B2 (en) 2010-07-28 2015-11-17 Panasonic Intellectual Property Management Co., Ltd. Antenna device and communication apparatus including the same
WO2012049473A3 (fr) * 2010-10-15 2012-12-13 Antenova Limited Antenne cadre pour combiné mobile et autres applications
US9502771B2 (en) 2010-10-15 2016-11-22 Microsoft Technology Licenseing, LLC Loop antenna for mobile handset and other applications
US9543650B2 (en) 2010-10-15 2017-01-10 Microsoft Technology Licensing, Llc Loop antenna for mobile handset and other applications
US9948003B2 (en) 2010-10-15 2018-04-17 Microsoft Technology Licensing, Llc Loop antenna for mobile handset and other applications
GB2501385B (en) * 2010-10-21 2015-05-27 Murata Manufacturing Co Communication terminal device
US9236651B2 (en) 2010-10-21 2016-01-12 Murata Manufacturing Co., Ltd. Communication terminal device
JP2012039672A (ja) * 2011-11-24 2012-02-23 Panasonic Corp アンテナ、アンテナ装置及び通信装置
JP2013236141A (ja) * 2012-05-07 2013-11-21 Hitachi Metals Ltd アンテナ装置
JP6239176B1 (ja) * 2017-04-21 2017-11-29 株式会社Maruwa アンテナモジュール
JP2018182691A (ja) * 2017-04-21 2018-11-15 株式会社Maruwa アンテナモジュール

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