WO2011036914A1 - アンテナ装置及び携帯端末 - Google Patents
アンテナ装置及び携帯端末 Download PDFInfo
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- WO2011036914A1 WO2011036914A1 PCT/JP2010/057946 JP2010057946W WO2011036914A1 WO 2011036914 A1 WO2011036914 A1 WO 2011036914A1 JP 2010057946 W JP2010057946 W JP 2010057946W WO 2011036914 A1 WO2011036914 A1 WO 2011036914A1
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- magnetic core
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—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 with core of ferromagnetic material
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
-
- 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
- H01Q7/06—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 with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
Definitions
- the present invention relates to an antenna device used for an RFID (Radio Frequency Identification) system that communicates with an external device through an electromagnetic field signal, and a portable terminal including the antenna device.
- RFID Radio Frequency Identification
- Patent Document 1 discloses an antenna device mounted on a portable electronic device used in an RFID system.
- the antenna device of Patent Document 1 includes an asymmetrical coil having different winding intervals at two positions facing each other across the central portion of the coil winding region.
- a magnetic body is disposed on the opposite side of the opposing main surface, and a magnetic body is disposed on the main surface facing the IC card on the side where the winding interval is small.
- FIG. 1 is a diagram showing a magnetic flux interlinking the coil of the antenna device when the angle formed between the antenna device similar to the antenna device shown in Patent Document 1 and the reader / writer antenna device is changed.
- the solid line arrows and the broken line arrows in FIG. 1 schematically represent the magnetic flux.
- the first main surface of the magnetic core 1 faces the side close to the planar conductor 2, the first conductor portion 11 of the coil conductor is close to the first main surface of the magnetic core 1, and the second of the coil conductors.
- the conductor portion 12 is close to the second main surface of the magnetic core 1. Then, an antenna coil including the magnetic core 1 and the coil conductor is disposed in the vicinity of the end of the planar conductor 2 to constitute an antenna device.
- the magnetic core 1 and the reader / writer side antenna device 30 are parallel, that is, when the angle formed between them is 0 °, the magnetic core 1 is on the right side.
- the magnetic flux entering from (solid line) is larger than the magnetic flux entering from the left side (broken line), and an electromotive force is generated in the coil.
- an object of the present invention is to provide an antenna device that suppresses deterioration in communication performance depending on the angle formed with respect to the reading surface of the reader / writer, and a portable terminal equipped with the antenna device.
- an antenna device of the present invention includes a plate-like magnetic core having a first main surface and a second main surface, and a coil conductor wound around the magnetic core.
- An antenna coil, and a planar conductor adjacent to the antenna coil The antenna coil is disposed on the opposite side of the antenna of the communication partner (reader / writer) across the planar conductor at or near the end of the planar conductor,
- a first conductor portion that is close to the first main surface of the magnetic core and a second conductor portion that is close to the second main surface of the magnetic core are: It is in a position where it does not overlap in plan perspective (viewed from the normal direction of the first main surface or the second main surface)
- the second main surface of the magnetic core faces the planar conductor,
- the first conductor portion is disposed closer to the end portion of the planar conductor than the second conductor portion.
- the magnetic core is a composite of a magnetic powder and a resin material formed into a sheet shape, or a sintered magnetic body that is divided into a plurality of pieces.
- the portion close to the first conductor portion is thicker than the other portions.
- the end portion of the magnetic core near the first conductor portion is bent in the direction of the planar conductor at a position protruding outward from the end portion of the planar conductor.
- a portable terminal according to the present invention includes any one of the antenna devices described above in a casing.
- the magnetic fluxes in the opposite directions interlinking the coil conductors are not equal to each other. Can be stably performed in the range of 0 ° to 90 ° or more or more without canceling each other.
- the entire antenna coil can be made flexible, and a high degree of freedom can be provided in the housing of an electronic device to be embedded such as a portable terminal. And can be incorporated.
- the magnetic resistance is lowered and the communication performance is improved.
- the shape of the end of the magnetic core near the first conductor portion is bent in the direction of the plane conductor at a position protruding outward from the end of the plane conductor, the magnetic resistance is lowered and the communication performance is reduced. improves.
- FIG. 3A is a plan view of the antenna device 101
- FIG. 3B is a front view of the antenna device 101.
- FIG. 3A is a plan view of the antenna device 101
- FIG. 3B is a front view of the antenna device 101.
- FIG. 3A is a plan view of the antenna device 101
- FIG. 3B is a front view of the antenna device 101.
- FIG. 3A is a plan view of the antenna device 101
- FIG. 3B is a front view of the antenna device 101.
- FIG. 7A is a plan view of the magnetic core 1 provided in the antenna coil according to the second embodiment
- FIG. 7B is a plan view of the antenna coil 22 according to the second embodiment
- FIG. 8A is a plan view of the magnetic core 1 provided in the antenna coil according to the third embodiment
- FIG. 8B is a plan view of the antenna coil 23 according to the third embodiment.
- FIG. 10A is a plan view of the antenna device 104
- FIG. 10B is a front view of the antenna device 104. It is a figure which shows the relationship between angle (theta) which the portable terminal holds over reader / writer, and the maximum communication distance.
- FIG. 2 is a cross-sectional view showing an internal configuration of the mobile terminal including the antenna device according to the first embodiment.
- An antenna device 101 including a circuit board 20 and an antenna coil 21 is provided inside the casing 200 of the portable terminal.
- a battery pack 41 and a liquid crystal display panel 42 are arranged at positions that do not overlap the antenna coil 21.
- FIG. 3A is a plan view of the antenna device 101
- FIG. 3B is a front view of the antenna device 101.
- the magnetic core 1 is a ferrite core formed in a rectangular plate shape.
- a coil conductor CW is wound around the magnetic core 1. Specifically, a rectangular spiral coil conductor CW is formed on the flexible substrate 10, a rectangular opening is provided at the center of the spiral, and the magnetic core 1 is inserted into the opening.
- the coil conductor CW includes a first conductor portion 11 proximate to the first main surface MS1 of the magnetic core 1 and a second conductor portion 12 proximate to the second main surface MS2 of the magnetic core 1.
- An antenna coil 21 is constituted by the magnetic core 1 and the coil conductor CW.
- a ground electrode extending in a planar shape is formed on the circuit board 20.
- This ground electrode is a planar conductor according to the present invention.
- the antenna coil 21 is such that the second main surface MS2 of the magnetic core 1 faces the circuit board 20 and the first conductor portion 11 is closer to the end of the circuit board 20 than the second conductor portion 12. Is arranged.
- the second conductor portion 12 that is close to the second main surface MS2 of the magnetic core 1 and the first conductor portion 11 that is close to the first main surface MS1 of the magnetic core 1 are:
- the magnetic core 1 is in a position where it does not overlap with each other in plan perspective (as viewed from the normal direction of the first main surface MS1 or the second main surface MS2 of the magnetic core 1).
- both ends of the coil conductor CW of the antenna coil 21 are connected to predetermined terminal electrodes on the circuit board 20. This connection structure is not shown.
- FIG. 4 is a perspective view showing an angle ⁇ over which the portable terminal 201 in which the antenna device is housed in the housing is held over the reader / writer antenna device 30.
- the antenna device is arranged in a state where the portable terminal 201 is arranged in parallel to the reader / writer side antenna device 30.
- 101 is arranged in parallel to the reader / writer side antenna device 30.
- the angle ⁇ at this time is 0 °.
- FIG. 5 is a diagram schematically showing the state of the magnetic flux passing through the antenna coil when the angle ⁇ shown in FIG. 4 is changed.
- the broken arrow line in FIG. 5 schematically represents the path of the magnetic flux.
- the magnetic flux of the reader / writer enters from one end of the magnetic core 1 and exits from the other end, and passes through the center of the formation region of the coil conductor CW. Also at this time, the direction of the magnetic flux passing through the coil conductor CW is the same.
- the magnetic flux of the reader / writer enters the magnetic core 1 in the direction of approximately 135 ° and passes through the center of the formation region of the coil conductor CW. Also at this time, the magnetic flux passing in the opposite direction to the coil conductor CW as shown in FIG. 1B is very small. Therefore, regardless of the value of the angle ⁇ over which the portable terminal 201 is held over the reader / writer side antenna device 30, there is no situation where the magnetic fluxes passing through the magnetic core in both directions cancel each other.
- FIG. 6 is a diagram showing the relationship between the angle ⁇ held by the portable terminal with respect to the reader / writer and the maximum communication distance.
- the broken line E is the characteristic of the antenna device according to the first embodiment
- the broken line P is the characteristic of the antenna device having the conventional structure shown in FIG.
- the maximum communication distance becomes extremely short when the angle ⁇ is around 30 ° to 50 °.
- the angle ⁇ is 0 ° to 90 ° (90 ° or more). It can be seen that the maximum communication distance can be kept large over the entire range.
- FIG. 7A is a plan view of the magnetic core 1 provided in the antenna coil according to the second embodiment
- FIG. 7B is a plan view of the antenna coil 22 according to the second embodiment.
- the difference from the antenna coil 21 shown in FIG. 3 is that one end of the magnetic core 1 is formed thicker than the other part.
- the magnetic core 1 having such a shape By using the magnetic core 1 having such a shape, the magnetic flux passing through the magnetic core 1 becomes stronger, the magnetic field coupling with the antenna of the communication partner can be strengthened, and the longest communicable distance becomes longer. Will improve. In particular, by making the portion of the magnetic core 1 close to the first conductor portion 11 thicker than the other portions, the magnetic flux collecting effect near the end of the circuit board is increased, and the communication performance is further improved.
- the entire one end of the magnetic core 1 is formed wide (thick), but this portion may have a trapezoidal shape that is wider toward the outside.
- a butterfly shape having a wide width from the center to both ends of the magnetic core 1 may be used.
- FIG. 8A is a plan view of the magnetic core 1 provided in the antenna coil according to the third embodiment
- FIG. 8B is a plan view of the antenna coil 23 according to the third embodiment.
- the antenna coil 23 includes a flexible substrate 10 on which a rectangular plate-shaped magnetic core 1 and a coil conductor are formed. What differs from the antenna coil 22 shown in FIG. 7B is the structure of the magnetic core 1.
- the magnetic core 1 shown in FIG. 8 (A) is formed by forming a composite of a magnetic powder such as ferrite powder and a resin material into a sheet, and further sintering it into a plurality of pieces.
- a sintered magnetic material is prepared, and both surfaces of a plurality of small pieces are laminated with a film.
- the part delimited by the broken line in FIG. 8 represents a small piece of sintered magnetic material. With such a configuration, the entire magnetic core 1 has flexibility.
- FIG. 9 is a diagram showing an installation state of the antenna coil in the portable terminal.
- the antenna coil 23 is attached to the inner surface of the casing 200 of the mobile terminal. Since the antenna coil 23 is flexible, it can be provided along the inner surface of the casing without being limited to a single plane in the casing. For this reason, it can be easily incorporated into a housing having various shapes.
- FIG. 10A is a plan view of the antenna device 104
- FIG. 10B is a front view of the antenna device 104. What is different from the antenna device 101 according to the first embodiment shown in FIG. 3 is the configuration of the antenna coil 24 and its arrangement position.
- the magnetic core 1 provided in the antenna device 104 according to the fourth embodiment is generally a rectangular plate-shaped ferrite core, but the end near the first conductor portion 11 is more than the end of the circuit board 20.
- a bent shape portion AE is formed which is bent toward the circuit board 20 at a position protruding outward.
- the antenna coil 24 is positioned closer to the outside of the circuit board 20 than the state shown in FIG. Has been placed. Others are the same as in the case of the first embodiment shown in FIG.
- the magnetic core 1 having such a shape and determining the arrangement position of the antenna coil, the magnetic flux passing through the magnetic core 1 is strengthened, and the magnetic flux collecting effect near the end of the circuit board is also increased.
- the magnetic field coupling with the antenna can be strengthened, and the communication performance is improved, for example, the longest communicable distance is increased.
- FIG. 11 is a diagram showing the relationship between the angle ⁇ held by the portable terminal with respect to the reader / writer and the maximum communication distance.
- the broken line E is the characteristic of the antenna device according to the fourth embodiment
- the broken line R is the characteristic of the antenna device provided with the antenna coil shown in FIG.
- the maximum communication distance can be kept large over the entire range of the angle ⁇ of 0 ° to 90 °. I understand.
- the ground electrode of the substrate is shown as an example of a planar conductor.
- a shield plate disposed on the back surface of the liquid crystal display panel, a conductor film or conductor formed on the inner surface of the housing The antenna device can also be configured by treating the foil and further the battery pack as a planar conductor.
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Abstract
Description
前記アンテナコイルは、前記平面導体の端部又は端部付近で、前記平面導体を挟んで通信相手(リーダライタ)のアンテナとは反対面側に配置され、
前記コイル導体のうち、前記磁性体コアの第1主面に近接する第1の導体部分と、前記磁性体コアの第2主面に近接する第2の導体部分とは、前記磁性体コアの平面透視で(第1主面または第2主面の法線方向から見て)重ならない位置にあり、
前記磁性体コアの第2主面は前記平面導体に対面し、
前記第1の導体部分は前記第2の導体部分に比べて前記平面導体の端部寄りに配置されたものとする。
また、磁性体コアの第1の導体部分寄りの端部を平面導体の端部より外方にはみ出た位置で平面導体方向へ折り曲げられた形状であれば、磁気抵抗が低下し、通信性能が向上する。
図2は第1の実施形態に係るアンテナ装置を備えた携帯端末の内部の構成を示す断面図である。
携帯端末の筐体200の内部には、回路基板20及びアンテナコイル21によるアンテナ装置101が設けられている。また、アンテナコイル21とは重ならない位置に電池パック41及び液晶表示パネル42が配置されている。
磁性体コア1は矩形板形状に成形されたフェライトのコアである。この磁性体コア1にはコイル導体CWが巻回されている。具体的には、フレキシブル基板10に矩形渦巻き状のコイル導体CWが形成されていて、その渦巻きの中心部に矩形の開口が設けられていて、その開口に磁性体コア1が挿入されている。
アンテナコイル21は、磁性体コア1の第2主面MS2が回路基板20に対面し、第1の導体部分11が第2の導体部分12に比べて回路基板20の端部寄りになるように配置されている。
なお、アンテナコイル21のコイル導体CWの両端は回路基板20上の所定の端子電極に接続される。この接続構造については図示を省略している。
θ=0°のとき、リーダライタの磁束は、回路基板20を迂回して磁性体コア1の一方端から入射し、コイル導体CWの形成領域の中心部を通過する。
θ=45°のとき、リーダライタの磁束は、磁性体コア1に対してほぼ45°方向に入射し、コイル導体CWの形成領域の中心部を通過する。このとき、図1(B)に示したようなコイル導体CWの形成領域の中心部を逆方向に通過する磁束は非常に小さい。
θ=90°のとき、リーダライタの磁束は、磁性体コア1の一方端から入射し他方端から出射するとともにコイル導体CWの形成領域の中心部を通過する。このときも、コイル導体CWを過ぎる磁束の方向は同じである。
したがって、携帯端末201をリーダライタ側アンテナ装置30にかざす角度θがどのような値であっても、磁性体コアを両方向に通過する磁束同士で互いに磁束を打ち消すような状況が生じない。
図7(A)は第2の実施形態に係るアンテナコイルに備える磁性体コア1の平面図、図7(B)は第2の実施形態に係るアンテナコイル22の平面図である。
図3に示したアンテナコイル21と異なるのは、磁性体コア1の一方端が他の部分より太く形成されていることである。
図8(A)は第3の実施形態に係るアンテナコイルに備える磁性体コア1の平面図、図8(B)は第3の実施形態に係るアンテナコイル23の平面図である。このアンテナコイル23は、矩形板形状の磁性体コア1とコイル導体が形成されたフレキシブル基板10を備えている。図7(B)に示されているアンテナコイル22と異なるのは、磁性体コア1の構造である。
図10(A)はアンテナ装置104の平面図、図10(B)はアンテナ装置104の正面図である。
図3に示した第1の実施形態に係るアンテナ装置101と異なるのは、アンテナコイル24の構成及びその配置位置である。
MS1…第1主面
MS2…第2主面
1…磁性体コア
10…フレキシブル基板
11…第1の導体部分
12…第2の導体部分
20…回路基板
21,22,23,24…アンテナコイル
30…リーダライタ側アンテナ装置
41…電池パック
42…液晶表示パネル
101,104…アンテナ装置
200…筐体
201…携帯端末
Claims (5)
- 第1主面及び第2主面を有する板状の磁性体コアと、この磁性体コアに巻回されたコイル導体と、を備えたアンテナコイル、及び前記アンテナコイルが近接する平面導体を備えたアンテナ装置において、
前記アンテナコイルは、前記平面導体の端部又は端部付近で、前記平面導体を挟んで通信相手のアンテナとは反対面側に配置され、
前記コイル導体のうち、前記磁性体コアの第1主面に近接する第1の導体部分と、前記磁性体コアの第2主面に近接する第2の導体部分とは、前記磁性体コアの平面透視で重ならない位置にあり、
前記磁性体コアの第2主面は前記平面導体に対面し、
前記第1の導体部分は前記第2の導体部分に比べて前記平面導体の端部寄りに配置された、アンテナ装置。 - 前記磁性体コアは、シート状に成型された、磁性体粉と樹脂材との混成体、又は複数に小片化された焼結磁性体である、請求項1に記載のアンテナ装置。
- 前記磁性体コアは、前記第1の導体部分に近接する部分が他の部分より太い、請求項1又は2に記載のアンテナ装置。
- 前記磁性体コアの前記第1の導体部分寄りの端部は前記平面導体の端部より外方にはみ出た位置で前記平面導体の方向へ折り曲げられている、請求項1~3のいずれかに記載のアンテナ装置。
- 請求項1~4のいずれかに記載のアンテナ装置を筐体内に備えた、携帯端末。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201080042271.3A CN102598412B (zh) | 2009-09-25 | 2010-05-11 | 天线装置及便携式终端 |
JP2011506266A JP4798317B2 (ja) | 2009-09-25 | 2010-05-11 | アンテナ装置及び携帯端末 |
US13/428,552 US8922444B2 (en) | 2009-09-25 | 2012-03-23 | Antenna device and mobile terminal |
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JP2009221627 | 2009-09-25 | ||
JP2009-221627 | 2009-09-25 |
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US13/428,552 Continuation US8922444B2 (en) | 2009-09-25 | 2012-03-23 | Antenna device and mobile terminal |
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WO2011036914A1 true WO2011036914A1 (ja) | 2011-03-31 |
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JP (1) | JP4798317B2 (ja) |
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JP2011071814A (ja) * | 2009-09-28 | 2011-04-07 | Murata Mfg Co Ltd | アンテナコイル、アンテナ装置及び携帯端末 |
JP2013077967A (ja) * | 2011-09-30 | 2013-04-25 | Dexerials Corp | アンテナ装置、通信装置 |
EP2418729A3 (en) * | 2010-08-12 | 2013-08-21 | Murata Manufacturing Co., Ltd. | Communication terminal |
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JP6122321B2 (ja) * | 2013-03-19 | 2017-04-26 | デクセリアルズ株式会社 | アンテナ装置及び電子機器 |
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US8922444B2 (en) | 2014-12-30 |
CN102598412A (zh) | 2012-07-18 |
JPWO2011036914A1 (ja) | 2013-02-14 |
US20120176283A1 (en) | 2012-07-12 |
JP4798317B2 (ja) | 2011-10-19 |
CN102598412B (zh) | 2015-05-27 |
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