WO2015045614A1 - Antenne, structure d'antenne, et résonateur - Google Patents

Antenne, structure d'antenne, et résonateur Download PDF

Info

Publication number
WO2015045614A1
WO2015045614A1 PCT/JP2014/070160 JP2014070160W WO2015045614A1 WO 2015045614 A1 WO2015045614 A1 WO 2015045614A1 JP 2014070160 W JP2014070160 W JP 2014070160W WO 2015045614 A1 WO2015045614 A1 WO 2015045614A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
resonator
sar
antenna element
coil
Prior art date
Application number
PCT/JP2014/070160
Other languages
English (en)
Japanese (ja)
Inventor
淳 東條
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2015045614A1 publication Critical patent/WO2015045614A1/fr

Links

Images

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
    • H01Q1/245—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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • 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

Definitions

  • the present invention relates to an antenna, an antenna structure, and a resonator, and more particularly to an antenna that can be incorporated into a mobile communication terminal, an antenna structure of the antenna, and a resonator used for the antenna.
  • SAR Specific Absorption Rate
  • SAR is obtained by dividing the energy absorbed by any living tissue 10g by exposure to an electromagnetic field in any 6 minutes by 10g, and further dividing by 6 minutes. It refers to the value obtained.
  • the unit of SAR is W / kg. SAR can tell how much energy a human tissue receives from a device that emits electromagnetic waves in a certain period of time.
  • “whole body average SAR” is SAR on the human head of radio waves emitted from radio equipment.
  • SAR is set to 2 W / kg or less according to Article 14-2 of the Radio Equipment Regulations.
  • a plurality of types of communication methods may be used at the same time in portable communication terminals. For example, while performing voice communication using a method such as CDMA (Code Division Multiple Access), data is transmitted using another type of method such as Wi-Fi (Wireless Fidelity) or LTE (Long Term Evolution). Communication may be performed.
  • CDMA Code Division Multiple Access
  • Wi-Fi Wireless Fidelity
  • LTE Long Term Evolution
  • FIG. 28 is a diagram for explaining the synthesis of SAR.
  • SAR distribution 1 in the figure the SAR distribution of communication in one communication method
  • SAR of communication in the other communication method the SAR of communication in the other communication method
  • the combined distribution obtained by adding the distribution is the SAR distribution of the mobile communication terminal. Since the SAR of this composite distribution must be equal to or less than the above-mentioned reference value 2 W / kg, it is more difficult to satisfy the reference than before.
  • Examples of the method for reducing the SAR include the following.
  • Patent Documents 6 to 11 there is a problem that the transmission / reception performance on the human body side is lowered over the entire band.
  • the method of Patent Document 10 has a problem that the SAR at the resonance frequency of the parasitic element is increased.
  • Patent Documents 12 and 13 there is a problem that the transmission / reception performance of the antenna in all directions is deteriorated.
  • the directivity can be controlled at a certain frequency, but there is a problem in that it radiates in the opposite direction at the operating frequency of the left-handed transmission line. . Such a problem can also occur in the conventional Yagi-Uda antenna.
  • the present invention has been made to solve the above-described problems, and one of the objects of the present invention is to reduce the transmission / reception performance of the antenna and reduce the human body side without being restricted by the layout and structure of the antenna.
  • an antenna is an antenna that can be incorporated into a mobile communication terminal, and includes an antenna element and a resonance wavelength of the antenna element to 1 ⁇ 4 of the antenna element. And one or a plurality of resonators that are electrically insulated from other portions and resonate at a wavelength near the resonance wavelength of the antenna element.
  • the present invention in addition to the antenna element, it is only necessary to provide a resonator that is insulated from other parts at a position less than a quarter of the resonance wavelength of the antenna element from the antenna element. For this reason, there is no restriction on the layout and structure of the antenna. Further, since the resonator is magnetically coupled to the antenna element at a wavelength in the vicinity of the resonance wavelength of the resonator, the SAR on the human body side of the electromagnetic wave in the vicinity of this wavelength can be suppressed to the minimum necessary. Moreover, since electromagnetic waves other than this wavelength are not suppressed, the fall of the antenna transmission / reception performance can be suppressed.
  • the resonator is provided on the side where the frequency of becoming closer to the human body than the antenna element during communication when the antenna is incorporated into the mobile communication terminal.
  • the SAR on the human body side can be further suppressed to the necessary minimum.
  • the resonator is a coil and is provided so that the magnetic field lines of the magnetic field of the antenna element penetrate the coil.
  • an inexpensive coil for example, a wound chip coil
  • the manufacturing cost of the antenna can be reduced.
  • the plurality of resonators are provided such that the coil axes are substantially parallel.
  • the effect of suppressing the SAR is weakened if the coil axes are substantially orthogonal, but can be prevented from being weakened if they are substantially parallel. As a result, the SAR suppression effect can be prevented from being weakened.
  • the resonance wavelengths of the plurality of resonators are substantially the same, and a part of the plurality of resonators and the remaining resonators are provided so that the coil axes are substantially orthogonal to each other. According to this invention, it can adjust so that the effect of SAR suppression may be weakened.
  • the resonance wavelengths of the plurality of resonators include a first resonance wavelength and a second resonance wavelength, and the resonators having the first resonance wavelength and the resonators having the second resonance wavelength are in respective coils.
  • the axes are provided so as to be substantially orthogonal.
  • the coil axes of the first resonance wavelength resonator and the second resonance wavelength resonator are not orthogonal to each other, they are coupled to each other, and the SAR suppression effect is effective only in the vicinity of the resonance wavelength of one of the resonators. I can't get it.
  • the resonator having the first resonance wavelength and the resonator having the second resonance wavelength are not coupled. As a result, SAR can be suppressed in the frequency band from the vicinity of the first resonance wavelength to the vicinity of the second resonance wavelength.
  • the resonator is an LC resonator.
  • an inexpensive LC resonator for example, MLCC
  • the manufacturing cost of the antenna can be reduced.
  • the antenna structure is an antenna structure of an antenna that can be incorporated into a mobile communication terminal, and is electrically insulated from other parts and resonates at a wavelength near the resonance wavelength of the antenna element.
  • One or a plurality of resonators are provided at a position less than a distance of 1/4 of the resonance wavelength of the antenna element from the antenna element.
  • a resonator used for an antenna that can be incorporated into a portable communication terminal is provided at a position less than a quarter of the resonance wavelength of the antenna element from the antenna element, and is electrically It is insulated from other parts and resonates at a wavelength near the resonance wavelength of the antenna element.
  • FIG. 1 It is a figure (plan view) showing the outline of the structure of the antenna according to the first embodiment. It is a figure (side view) which shows the outline of the structure of the antenna which concerns on 1st Embodiment. It is a figure (rear view) which shows the outline of the structure of the antenna which concerns on 1st Embodiment. It is a figure (front view) which shows the outline of the structure of the antenna which concerns on 1st Embodiment. It is a graph which shows the relationship between SAR and the frequency of the antenna which concerns on 1st Embodiment. It is a figure which shows the outline of the structure of the antenna which concerns on 2nd Embodiment. It is a graph which shows the reflective characteristic of the antenna which concerns on 2nd Embodiment.
  • It is the 1st figure (plan view of a printed circuit board) showing the outline of the structure of the antenna concerning a 4th embodiment.
  • It is the 1st figure (back view of a printed circuit board) showing the outline of the structure of the antenna concerning a 4th embodiment.
  • It is the 1st figure (front view of a printed circuit board) showing the outline of the structure of the antenna concerning a 4th embodiment.
  • 1A to 1D are diagrams (plan view, side view, rear view, and front view) showing an outline of the structure of the antenna according to the first embodiment.
  • the antenna according to the first embodiment is formed on a printed circuit board 100 and includes an antenna element 20 and a ground 30.
  • the antenna element 20 is provided with a feeding point and is fed from the feeding point.
  • the antenna further includes a coil 10 as a resonator.
  • a chip coil is used as the coil 10.
  • a chip coil is used as the coil. Since the chip coil is a general-purpose product that is easily available and inexpensive, an increase in the manufacturing cost of the antenna for reducing the SAR can be suppressed. Further, the chip coil can be easily mounted on the substrate.
  • the resonator may be an LC resonator, for example, an MLCC (Multi-Layer Ceramic Capacitor, multilayer ceramic capacitor) instead of the coil.
  • MLCC Multi-Layer Ceramic Capacitor, multilayer ceramic capacitor
  • the coil 10 is electrically insulated from other parts.
  • the coil 10 is mounted on the surface of the printed board 100 opposite to the side on which the antenna element 20 is formed. For this reason, it is possible not to affect the structure and arrangement of the antenna.
  • the coil 10 is mounted in the figure (five here), it is not limited to this and may be one.
  • a magnetic field is generated in the direction in which the screw rotates when the right screw about the longitudinal direction, which is the direction in which the current of the antenna element 20 flows, is screwed in the current direction.
  • the coil 10 is mounted so that the axis of the coil 10 is parallel to the printed circuit board 100 and perpendicular to the longitudinal direction of the antenna element 20 so that the magnetic field lines generated by the antenna element 20 penetrate the coil 10. Thereby, the antenna element 20 and the coil 10 are magnetically coupled.
  • the coil 10 may be mounted in another direction in a different direction as long as the magnetic field lines generated by the antenna element 20 are provided so as to penetrate the coil 10.
  • FIG. 2 is a graph showing the relationship between the SAR and the frequency of the antenna according to the first embodiment.
  • a broken line indicates a case where the coil 10 is not included in the antenna of FIGS. 1A to 1D
  • a solid line indicates a case where the coil 10 is included in the antenna of FIGS. 1A to 1D.
  • the antenna element 20 of the present embodiment has a shape that matches the frequency of 1.9 GHz. Further, the coil 10 of the present embodiment has a resonance frequency of about 2.0 GHz.
  • the coil 10 is arranged so as to be closer to the human body than the antenna element 20, the electromagnetic wave from the antenna element 20 is attenuated when it exceeds the coil 10, so that SAR can be more effectively suppressed. .
  • FIG. 3 is a diagram schematically illustrating the structure of the antenna according to the second embodiment.
  • the antenna of the second embodiment includes an antenna element 20 ⁇ / b> D and a coil 10 ⁇ / b> D similar to the coil 10 of the first embodiment.
  • the antenna element 20D of this embodiment has a dipole antenna shape.
  • a magnetic field is generated in the direction in which the screw rotates when the right screw about the longitudinal direction (X-axis direction in the figure), which is the direction in which the current of the antenna element 20D flows, is screwed in the current direction.
  • the coil 10D is directed so that the magnetic field lines generated by the antenna element 20D penetrate the coil 10D. Thereby, antenna element 20D and coil 10D are magnetically coupled.
  • FIG. 4 is a graph showing the reflection characteristics of the antenna according to the second embodiment.
  • the resonance of the antenna at 2.4 GHz is suppressed. Further, resonance is not suppressed at frequencies other than the vicinity of 2.4 GHz. For this reason, the SAR is reduced in the vicinity of 2.4 GHz while maintaining the transmission / reception characteristics except in the vicinity of 2.4 GHz.
  • FIG. 5 and 6 are diagrams showing three-dimensional radiation patterns at 2.1 GHz and 2.4 GHz, respectively, in the second embodiment.
  • these radiation patterns are radiation patterns viewed from the X-axis direction.
  • the negative direction of the Y axis which is the direction in which the coil 10D is disposed with respect to the antenna element 20D, is whitish.
  • the stronger the radiation the darker the color. For this reason, it turns out that the radiation
  • Such an effect that the radiation of the antenna element 20D in the direction in which the coil 10D is arranged is weakened is not limited to the antenna of the second embodiment, and is also achieved by the antenna of the first embodiment described above. It can also be achieved by the antenna of the embodiment described later.
  • FIGS. 7A to 7D are views (plan view, side view, rear view, and front view) schematically showing the structure of the antenna according to the third embodiment.
  • the structure of the antenna according to the third embodiment is the same as the structure of the antenna according to the first embodiment except for the arrangement of coil 10A.
  • the antenna element 20 resonates around 1.9 GHz.
  • the ground 30A resonates around 850 MHz instead of the antenna element 20A.
  • radio waves are radiated from the ground 30A.
  • a magnetic field is generated in the direction in which the screw rotates when the right screw about the longitudinal direction, which is the direction in which the current of the ground 30A flows, is screwed in the current direction.
  • the coil 10A is mounted so that the axis of the coil 10A is parallel to the printed circuit board 100A and perpendicular to the longitudinal direction of the ground 30A so that the magnetic field lines of the magnetic field generated by the ground 30A pass through the coil 10A. Thereby, the ground 30A and the coil 10A are magnetically coupled.
  • the coil 10A may be mounted in another direction in a different direction as long as the magnetic field lines generated by the ground 30A pass through the coil 10A.
  • FIG. 8 is a graph showing the relationship between the SAR and the frequency of the antenna according to the third embodiment.
  • the broken line indicates a case where the antenna of FIGS. 7A to 7D does not include the coil 10A
  • the solid line indicates a case where the antenna of FIGS. 7A to 7D includes the coil 10A.
  • the ground 30A of the present embodiment has a shape that matches the frequency of 850 MHz.
  • the coil 10 of the present embodiment has a resonance frequency of about 840 MHz.
  • FIG. 10 are respectively a first diagram (a plan view of a printed circuit board, a rear view and a front view, and a plan view of a housing) showing an outline of the structure of an antenna according to a fourth embodiment. It is a figure and a front view), and a 2nd figure.
  • FIGS. 9A to 9E and FIG. 10 is an assembly view in which the printed circuit board 100B shown in FIGS. 9A to 9C and the casing 200B shown in FIGS. 9D and 9E are assembled.
  • the antenna according to the fourth embodiment is formed on the printed circuit board 100B and the housing 200B, and includes an antenna element 20B and a coil 10B.
  • the antenna element 20B is formed by plating or the like on the inner surface of a housing 200B formed of a resin that does not conduct electricity.
  • the antenna element 20B is provided with a feeding point, and the feeding point is fed from the antenna connection connector 30B of the printed circuit board 100B.
  • the coil 10B is electrically insulated from other parts.
  • the coil 10B is mounted on a printed circuit board 100B different from the housing 200B in which the antenna element 20B is formed. For this reason, it is possible not to affect the structure and arrangement of the antenna.
  • the coil 10B is mounted in the figure by a plurality (five here), it is not limited to this and may be one.
  • a magnetic field is generated in the direction in which the screw rotates when the right screw about the longitudinal direction, which is the direction in which the current of the antenna element 20B flows, is screwed in the current direction.
  • the coil 10B is mounted so that the axis of the coil 10B is parallel to the printed circuit board 100B and perpendicular to the longitudinal direction of the antenna element 20B so that the magnetic field lines generated by the antenna element 20B penetrate the coil 10B. Thereby, the antenna element 20B and the coil 10B are magnetically coupled.
  • the coil 10B may be mounted in another direction in a different direction as long as the magnetic field lines generated by the antenna element 20B penetrate the coil 10B.
  • the antenna of the fourth embodiment also has the effect of suppressing SAR near the resonance frequency of the coil 10B.
  • FIGS. 11 to 13 are first to third diagrams for explaining coupling between antennas according to the fifth embodiment, respectively.
  • FIG. 11 shows a case where no coil is provided.
  • FIG. 12 shows a case where the coils 10X and 10Y are provided outside the antennas 20X and 20Y, respectively.
  • FIG. 13 shows a case where the coils 10X and 10Y are provided inside the antennas 20X and 20Y, respectively.
  • FIG. 14 is a graph showing a comparison result of coupling between antennas according to the fifth embodiment.
  • the wavy line shows the case of FIG. 11, the alternate long and short dash line shows the case of FIG. 12, and the solid line shows the case of FIG.
  • the radiation for the respective antennas 20X and 20Y shows the effect of suppressing the radiation from the antenna, that is, the SAR, regardless of whether the coils 10X and 10Y are provided outside or inside.
  • FIGS. 15 and 18 are first and second diagrams, respectively, showing an outline of the antenna structure for explaining the SAR suppression amount adjustment according to the sixth embodiment.
  • FIGS. 16 and 19 are first and second diagrams showing the radiation characteristics of the antenna, respectively, for explaining the SAR suppression amount adjustment according to the sixth embodiment.
  • FIGS. 17 and 20 are first and second diagrams showing the relationship between the SAR of the antenna and the frequency, respectively, for explaining the SAR suppression amount adjustment according to the sixth embodiment.
  • the right screw about the longitudinal direction which is the direction in which the current of antenna elements 20E and 20F flows, is screwed in the direction of current.
  • a magnetic field is generated in the direction of rotation.
  • all the coils 10 ⁇ / b> E are mounted so that the axes thereof are parallel to the plane of the antenna element 20 ⁇ / b> E and perpendicular to the longitudinal direction of the antenna element 20 ⁇ / b> E.
  • the coil 10F is mounted so that the axis of the coil 10F is parallel to the plane of the antenna element 20F and inclined at 45 degrees or ⁇ 45 degrees in the direction perpendicular to the longitudinal direction of the antenna element 20F.
  • the coils 10F are alternately inclined at 45 degrees or ⁇ 45 degrees, but the present invention is not limited to this, and the coils 10F may not be alternated.
  • FIG. 16 shows the reflection characteristics of the antenna when it is not tilted at 45 degrees or ⁇ 45 degrees.
  • FIG. 19 shows the reflection characteristics of the antenna when tilted by 45 degrees or ⁇ 45 degrees.
  • the broken line indicates a case where no coil is provided, and the solid line indicates a case where a coil is provided.
  • the degree of weakening the resonance of the coil is less when tilted than when not tilted.
  • FIG. 17 shows the relationship between the SAR and the frequency of the antenna when it is not tilted by 45 degrees or ⁇ 45 degrees.
  • FIG. 20 shows the relationship between the antenna SAR and the frequency when tilted by 45 degrees or ⁇ 45 degrees.
  • the broken line indicates a case where no coil is provided, and the solid line indicates a case where a coil is provided.
  • the suppression amount of SAR can be adjusted by mixing the inclined coil and the non-inclined coil.
  • FIG. 21 and FIG. 24 are first and second diagrams, respectively, showing an outline of the antenna structure for explaining the broadbanding of SAR suppression according to the seventh embodiment.
  • FIG. 22 and FIG. 25 are first and second diagrams showing the radiation characteristics of the antenna for explaining the increase in the bandwidth of SAR suppression according to the seventh embodiment, respectively.
  • FIG. 23 and FIG. 26 are first and second diagrams showing the relationship between the SAR of the antenna and the frequency, respectively, for explaining the increase in the bandwidth of SAR suppression according to the seventh embodiment.
  • the right screw about the longitudinal direction which is the direction in which the current of antenna elements 20G and 20H flows, is screwed in the current direction.
  • a magnetic field is generated in the direction of rotation.
  • the axes of all the first resonance frequency coils 10GA and all the second resonance frequency coils 10GB are parallel to the plane of the antenna element 20G and perpendicular to the longitudinal direction of the antenna element 20G. To be mounted.
  • the coils 10GA of all the first resonance frequencies are mounted so that the axes thereof are parallel to the plane of the antenna element 20G and inclined by 45 degrees in the direction perpendicular to the longitudinal direction of the antenna element 20G.
  • the coils 10GB of all the second resonance frequencies are mounted so that the axes thereof are parallel to the plane of the antenna element 20G and inclined by -45 degrees in the direction perpendicular to the longitudinal direction of the antenna element 20Gno.
  • FIG. 22 shows the reflection characteristics of the antenna when it is not tilted.
  • FIG. 25 shows the reflection characteristics of the antenna when tilted. 22 and 25, a broken line indicates a case where no coil is provided, and a solid line indicates a case where a coil is provided.
  • a broken line indicates a case where no coil is provided, and a solid line indicates a case where a coil is provided.
  • FIG. 23 shows the relationship between the SAR and the frequency of the antenna when tilted.
  • FIG. 26 shows the relationship between the SAR and frequency of the antenna when it is not tilted. 22 and 25, a broken line indicates a case where no coil is provided, and a solid line indicates a case where a coil is provided.
  • the coils having different resonance frequencies are coupled to each other.
  • SAR suppression effect can be broadened by arranging the frequency coils in a tilted manner. Note that it is desirable that the angle formed by the axes of the coils having different resonance frequencies is a right angle since the coupling between the coils can be completely prevented.
  • FIG. 29 is a diagram schematically illustrating the structure of the antenna according to the eighth embodiment.
  • the antenna according to the eighth embodiment is obtained by replacing the coil 10 as the resonator of the antenna according to the first embodiment with an MLCC that is an example of an LC resonator.
  • the antenna of the eighth embodiment is formed on printed circuit board 100J and includes antenna elements 20JA and 20JB and a ground 30J.
  • the antenna element 20JB is provided with a feeding point 50J and is fed from the feeding point 50J.
  • the antenna of the eighth embodiment further includes an LC resonator 40J as a resonator.
  • MLCC is used as the LC resonator 40J. Since MLCC is a general-purpose product that is easily available and inexpensive, it is possible to suppress an increase in the manufacturing cost of an antenna for reducing SAR.
  • LC resonator 40J is electrically insulated from other parts of the antenna.
  • the LC resonator 40J is magnetically coupled to one of the antenna elements 20JA and JB in the vicinity of one of the antenna elements 20JA and 20JB on the surface where the antenna elements 20JA and 20JB and the ground 30J of the printed board 100J are formed.
  • the position and direction are determined and mounted.
  • the distance between the antenna elements 20JA and 20JB and the LC resonator 40J is 0.1 mm. For this reason, it is possible not to affect the structure and arrangement of the antenna.
  • four LC resonators 40J are mounted in FIG. 29, the present invention is not limited to this, and other plural or one LC resonator 40J may be used.
  • FIG. 30 is a graph showing the relationship between the SAR and the frequency of the antenna according to the eighth embodiment.
  • the broken line indicates a case where the antenna of FIG. 29 does not include the LC resonator 40J
  • the solid line indicates a case where the antenna of FIG. 29 includes the LC resonator 40J.
  • the antenna elements 20JA and 20JB of the present embodiment have shapes that match the frequencies of 0.8 GHz and 1.9 GHz.
  • the SAR from 0.80 GHz to 0.85 GHz is suppressed by the LC resonator 40J mounted near the ground 30J of the antenna element 20JA, and 1 by the LC resonator 40J mounted near the antenna element 20JB. .9 GHz to 2.0 GHz SAR is suppressed.
  • the Q value of the resonator is lower than that in the case of using a coil and the resonance bandwidth is narrowed, but the size can be reduced. Further, since the MLCC alone has a higher-order resonance mode that becomes an LC resonator, a commercially available MLCC can be used without creating a dedicated resonator.
  • the LC resonator 40J is disposed close to the antenna elements 20JA and 20JB, the magnetic coupling between the antenna elements 20JA and 20JB and the LC resonator 40J becomes strong. For this reason, even if the number of LC resonators 40J is as small as 1 to several, the effect of suppressing SAR can be obtained.
  • the LC resonator 40J is arranged so as to be closer to the human body than the antenna elements 20JA and 20JB, the electromagnetic wave from the antenna elements 20JA and 20JB is attenuated when exceeding the LC resonator 40J. SAR can be suppressed.
  • FIG. 31 is a diagram schematically illustrating the structure of the antenna according to the ninth embodiment.
  • a plurality of (48 in this case) LC resonators 40KA and 40KB are formed of the antenna element 20KB. It is mounted in the vicinity (surface opposite to the side on which the antenna element of the printed board 100K is formed).
  • the LC resonator 40KA and the LC resonator 40KB are mounted alternately at an angle of 90 degrees.
  • the distance between the antenna element 20KB and the LC resonators 40KA and 40KB is 3 mm.
  • FIG. 32 is a graph showing the relationship between the SAR and the frequency of the antenna according to the ninth embodiment.
  • a broken line indicates a case where the antenna of FIG. 31 does not include the LC resonators 40KA and 40KB
  • a solid line indicates a case where the antenna of FIG. 31 includes the LC resonators 40KA and 40KB.
  • the antenna elements 20KA and 20KB of the present embodiment have a shape that matches the frequency of the 1.9 GHz band.
  • the SAR value is high.
  • the SAR value is about 0.2 to 1.1 W / in comparison with the case where the LC resonators 40KA and 40KB are not included. It has decreased by about kg.
  • the LC resonator is arranged on the surface of the printed board 100K opposite to the side on which the antenna element is formed. For this reason, the degree of freedom in the arrangement and mounting direction of the LC resonator is increased.
  • the distance between the antenna element and the LC resonator is larger in the ninth embodiment than in the eighth embodiment.
  • the ninth embodiment uses more LC resonators than the eighth embodiment. Thereby, in the ninth embodiment, the same SAR suppression effect as that in the eighth embodiment can be obtained.
  • the LC resonators 40KA and 40KB are periodically arranged at an angle of 90 degrees as in this embodiment, so that the SAR suppression effect is enhanced. It is effective for.
  • the LC resonators 40KA and 40KB are arranged so as to be closer to the human body than the antenna elements 20KA and 20KB, electromagnetic waves from the antenna elements 20KA and 20KB are attenuated when they exceed the LC resonators 40KA and 40KB. SAR can be more effectively suppressed.
  • FIG. 27A and FIG. 27B are diagrams (conventional and the present example) for explaining the effects of the present embodiment, respectively.
  • the SAR is configured to be suppressed with respect to all frequencies so that the SAR becomes 2 W / kg or less which is the reference value of the radio equipment rule. .
  • the SAR in the band where the SAR is originally 2 W / kg or less also decreases, the transmission / reception performance of the antenna in such a band has been lowered.
  • FIG. 30 of the present embodiment and FIG. 27B schematically showing FIG. 32 of the ninth embodiment SAR at some frequencies is suppressed in this embodiment. So that the SAR is 2 W / kg. For this reason, the SAR is suppressed only for the band that needs to be suppressed, and the SAR need not be suppressed for the band that does not need to be suppressed. Therefore, the SAR is suppressed to the minimum necessary without lowering the antenna transmission / reception performance more than necessary. be able to.
  • the distance between the resonator and the antenna element may be adjusted.
  • the distance between the resonator and the antenna element may be at least less than 1 ⁇ 4 of the resonance wavelength of the antenna element, but the shorter the distance, the better.
  • the distance between the director and the radiator of the Yagi-Uda antenna and the distance between the radiator and the reflector will be wider, and even the Yagi-Uda antenna can be used as a portable communication terminal. Since it is too large to apply, it is difficult to use it for a portable communication terminal.
  • the frequency may change, and the reflector may function as a director. In this case, many electromagnetic waves are radiated from the radiator to the reflector side, and the SAR on the side where SAR is desired to be increased increases.
  • the resonator (coil) of the above-described embodiment has a size of 1/4 or less of the resonance wavelength of the antenna element.
  • the distance of a resonator and an antenna element can be shortened.
  • re-radiation from the resonator itself can be almost eliminated, and SAR can be suppressed only in the target frequency band.
  • the resonator mounting space can be reduced, the influence on the size reduction of the portable communication terminal due to the mounting of the resonator can be reduced.
  • a resonator is provided for one antenna.
  • the present invention is not limited to this, and when a plurality of antennas are provided, a resonator may be provided for each antenna.
  • a resonator is provided on the side that is closer to the human body than the antenna element during communication when the antenna is incorporated in a mobile communication terminal” means that a transmitter used for voice communication in a mobile communication terminal And a resonator is provided on the side closer to the human body than the antenna element when the receiver is brought close to the user's mouth and ear during voice communication, and the display used for data communication in the portable communication terminal is data A resonator is provided on the side closer to the human body than the antenna element when directed toward the user's eye during communication.
  • a resonator for example, coil
  • coils are arranged at regular intervals as shown in FIGS. 1A to 1D, FIG. 3, FIG. 7A to FIG. 7D, FIG. 10, FIG. 15, FIG. I did it. However, it is not necessary to arrange them at regular intervals.
  • the SAR suppression effect is evenly closer when arranged at equal intervals.
  • the SAR values that are sparsely suppressed need only be equal to or less than the reference value 2 W / kg without being arranged at equal intervals.
  • the resonator When the resonator (coil) is half the wavelength of the electromagnetic wave radiated from the antenna element, the resonator functions as a metamaterial. Thereby, the magnetic permeability and dielectric constant of the resonator become negative, and electromagnetic field radiation can be further suppressed.
  • the above-described mobile communication terminal may be any terminal provided with an antenna and capable of being carried by a person, and may be, for example, a smartphone or a conventional mobile phone. However, it may be a tablet terminal that has a data communication function but no call function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)

Abstract

L'invention concerne une antenne pouvant être incorporée dans un terminal de communication mobile, comprenant : un élément d'antenne (20) ; et des résonateurs (bobines 10), placés chacun sur une position éloignée de l'élément d'antenne d'une distance inférieure au quart de leur longueur d'onde de résonance, chaque partie étant isolée des autres parties, et chacun entrant en résonance dans le voisinage de la longueur d'onde de résonance de l'élément d'antenne. En dehors de l'élément d'antenne, il n'est besoin de rien d'autre à l'exception des résonateurs tous isolés sur une position inférieure au quart de la longueur d'onde de résonance de l'élément d'antenne. De ce fait, il n'y a pas de restriction sur la structure et la disposition de l'antenne. Etant donné que chaque résonateur est couplé magnétiquement à l'élément d'antenne dans le voisinage de la longueur d'onde de résonance du résonateur, il est possible de supprimer, en le réduisant au simple minimum, le DAS, qui est du côté corps humain, des ondes électromagnétiques dans le voisinage de cette longueur d'onde. Etant donné que les ondes électromagnétiques autres que cette longueur d'onde ne sont pas supprimées, il est possible de supprimer la dégradation des performances d'émission/réception de l'antenne.
PCT/JP2014/070160 2013-09-25 2014-07-31 Antenne, structure d'antenne, et résonateur WO2015045614A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013198205 2013-09-25
JP2013-198205 2013-09-25

Publications (1)

Publication Number Publication Date
WO2015045614A1 true WO2015045614A1 (fr) 2015-04-02

Family

ID=52742770

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/070160 WO2015045614A1 (fr) 2013-09-25 2014-07-31 Antenne, structure d'antenne, et résonateur

Country Status (1)

Country Link
WO (1) WO2015045614A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6583596B1 (ja) * 2018-08-09 2019-10-02 株式会社村田製作所 無線通信デバイス
WO2019239677A1 (fr) * 2018-06-13 2019-12-19 株式会社村田製作所 Dispositif de communication sans fil
WO2020012725A1 (fr) * 2018-07-13 2020-01-16 株式会社村田製作所 Dispositif de communication sans fil
WO2020031419A1 (fr) * 2018-08-09 2020-02-13 株式会社村田製作所 Dispositif de communication sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289392A (ja) * 1996-04-24 1997-11-04 K Lab:Kk 電磁波吸収装置
JP2001196845A (ja) * 1999-12-30 2001-07-19 K Cera Inc 電磁波遮断機能を有するアンテナ及びその製造方法
JP2007266854A (ja) * 2006-03-28 2007-10-11 Kyocera Corp 通信装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289392A (ja) * 1996-04-24 1997-11-04 K Lab:Kk 電磁波吸収装置
JP2001196845A (ja) * 1999-12-30 2001-07-19 K Cera Inc 電磁波遮断機能を有するアンテナ及びその製造方法
JP2007266854A (ja) * 2006-03-28 2007-10-11 Kyocera Corp 通信装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019239677A1 (fr) * 2018-06-13 2019-12-19 株式会社村田製作所 Dispositif de communication sans fil
US11381273B2 (en) 2018-06-13 2022-07-05 Murata Manufacturing Co., Ltd. Wireless communication device
WO2020012725A1 (fr) * 2018-07-13 2020-01-16 株式会社村田製作所 Dispositif de communication sans fil
JP6658976B1 (ja) * 2018-07-13 2020-03-04 株式会社村田製作所 無線通信デバイス
US11545732B2 (en) 2018-07-13 2023-01-03 Murata Manufacturing Co., Ltd. Wireless communication device
JP6583596B1 (ja) * 2018-08-09 2019-10-02 株式会社村田製作所 無線通信デバイス
WO2020031419A1 (fr) * 2018-08-09 2020-02-13 株式会社村田製作所 Dispositif de communication sans fil
US11379704B2 (en) 2018-08-09 2022-07-05 Murata Manufacturing Co., Ltd. Wireless communication device

Similar Documents

Publication Publication Date Title
EP2840651B1 (fr) Antennes multiports multibandes accordables et procédé
AU2012330892B2 (en) Capacitively coupled compound loop antenna
JP6465109B2 (ja) マルチアンテナ及びそれを備える無線装置
US20140253398A1 (en) Tunable antenna
US20110032165A1 (en) Antenna with multiple coupled regions
US20120306718A1 (en) Antenna and wireless mobile terminal equipped with the same
JP5725571B2 (ja) アンテナ装置及び無線通信機
JP2004516699A (ja) 仮想磁壁を有するアンテナ
JP2011114643A (ja) アンテナおよび無線通信装置
CN106299628B (zh) 一种天线和无线路由器
US20130078935A1 (en) Compact multi-antenna and multi-antenna system
WO2015045614A1 (fr) Antenne, structure d'antenne, et résonateur
Kamal et al. Printed meander line MIMO antenna integrated with air gap, DGS and RIS: A low mutual coupling design for LTE applications
WO2013175903A1 (fr) Dispositif d'antenne et dispositif sans fil mimo
JP2014053885A (ja) マルチバンドアンテナ
JP6478510B2 (ja) アンテナ
KR20100104086A (ko) 다중 대역 안테나 장치 및 이를 이용한 통신 장치
JP2005117490A (ja) 小型アンテナ及び多周波共用アンテナ
JP2008278414A (ja) アンテナ装置
US10320057B2 (en) Antenna device, wireless communication device, and band adjustment method
CN106129637B (zh) 基于谐振环去耦结构的多天线mimo系统
Hasan et al. Dual band slotted printed circular patch antenna with superstrate and EBG structure for 5G applications
US20150155619A1 (en) Circularly Polarized Compact Helical Antenna
CN114552191A (zh) 天线装置和无人飞行器
KR102252220B1 (ko) 다이폴 안테나

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14849746

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 14849746

Country of ref document: EP

Kind code of ref document: A1