JP2004247851A - Built-in antenna for mobile communication - Google Patents

Built-in antenna for mobile communication Download PDF

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Publication number
JP2004247851A
JP2004247851A JP2003033810A JP2003033810A JP2004247851A JP 2004247851 A JP2004247851 A JP 2004247851A JP 2003033810 A JP2003033810 A JP 2003033810A JP 2003033810 A JP2003033810 A JP 2003033810A JP 2004247851 A JP2004247851 A JP 2004247851A
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JP
Japan
Prior art keywords
antenna
mobile communication
built
magnetic
support member
Prior art date
Legal status (The legal status 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 status listed.)
Pending
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JP2003033810A
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Japanese (ja)
Inventor
Hideki Sato
秀樹 佐藤
Takehiro Sugiyama
剛博 杉山
Morihiko Ikegaya
守彦 池ヶ谷
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Hitachi Cable Ltd
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Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP2003033810A priority Critical patent/JP2004247851A/en
Publication of JP2004247851A publication Critical patent/JP2004247851A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a built-in antenna for mobile communication for reducing the SAR (Specific Absorption Rate) without deteriorating the antenna characteristics. <P>SOLUTION: Since a magnetic member 5 is provided to a side face of the built-in antenna 1 for mobile communication by providing the magnetic member 5 to an insulating support member 11 for supporting at least a peripheral part of a conductor plate 2 acting like a radiation part in a closely attached way, unnecessary electromagnetic waves leaked from the side face of the built-in antenna 1 for mobile communication are shielded resulting in reducing the SAR. As a result, the electromagnetic wave in the vicinity of a mobile phone, in particular, the electromagnetic wave locally having a high strength can be reduced and almost no effect is given on the electromagnetic waves in a remote field. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、携帯型電話機等の移動体通信用端末に用いられる移動体通信用内蔵アンテナに関する。
【0002】
【従来の技術】
移動体通信技術の発達に伴い、より多くの人が携帯の無線端末、特に携帯型電話機を使用する頻度が高くなってきた。この携帯型電話機の使用に伴い、携帯型電話機から発せられる電磁波が、携帯型電話機を使用する人の健康に多大な影響を与えることが指摘されるようになってきた。
【0003】
近年、携帯型電話機が発生する電磁波が人体に与える影響として、人体の特定部分に加えられた電磁波エネルギーの比吸収率(SAR:Specific Absorption Rate)を評価し、一定値以下に抑えることが義務付けられている。
【0004】
携帯型電話機から発生する電磁波は、アンテナ給電点付近が最も強いと言われている。そのため、ロッドアンテナやヘリカルアンテナ等のワイヤ系の外部アンテナでは、アンテナ取付位置を、通話時の人体から遠ざける等の工夫がなされている。この外部アンテナに対して内蔵アンテナを用いることで、アンテナは人体側から見て携帯型電話機内のプリント配線基板の裏側になるため、人体に与える影響を小さくすることができると言われている。
【0005】
また、SARを低減するために、シート状の磁性体を携帯型電話機内のプリント配線基板と人体との間に配置されるようにして人体近傍の電磁波を抑える方法等が検討されている(例えば、特許文献1参照。)。
【0006】
【特許文献1】
特開2002−271468号公報
【0007】
【発明が解決しようとする課題】
ところで、上述した従来技術では、ロッドアンテナやヘリカルアンテナ等の外部アンテナについてはSAR値を抑えることができる。
【0008】
しかしながら、内蔵アンテナについては有効な技術であるとは言えない。磁性体をプリント配線基板と人体(特に頭部)との間に配置することも検討されているが、通常、携帯型電話機において、磁性体を配置する部分には、液晶ディスプレイが配置されているため、不透明である磁性体を液晶ディスプレイに配置しなければならず、液晶ディスプレイの面積を縮小しなければならない等の制限が伴う。そのため、ある程度の厚さや面積を必要とするため、そのまま磁性体を配置することができず、磁性体を配置する場合にはアンテナを縮小させると共に延長コイルを用いなければならずアンテナ特性を劣化させることになるという問題があった。
【0009】
そこで、本発明の目的は、上記課題を解決し、アンテナ特性を劣化させることなくSARを低減させた移動体通信用内蔵アンテナを提供することにある。
【0010】
【課題を解決するための手段】
上記目的を達成するために請求項1の発明は、金属からなり放射部となる導体板と、導体板の少なくとも周辺部を支持する絶縁性の支持部材と、支持部材に密着すると共に導体板と離隔するように設けられた磁性部材とを備えた移動体通信用内蔵アンテナである。
【0011】
請求項2の発明は、請求項1に記載の構成に加え、導体板と平行になると共に、磁性部材と離隔するように支持部材側に地板が配置されているのが好ましい。
【0012】
請求項3の発明は、請求項1または2に記載の構成に加え、磁性部材は、粉末状の磁性体を樹脂に含ませた後シート状に加工した磁性シートであってもよい。
【0013】
請求項4の発明は、請求項3に記載の構成に加え、磁性シートは、支持部材の導体板に対して垂直な面に帯状に設けられているのが好ましい。
【0014】
請求項5の発明は、請求項2から4のいずれかに記載の構成に加え、磁性シートは、導体板から少なくとも1mm離れて設けられているのが好ましい。
【0015】
請求項6の発明は、請求項1または2に記載の構成に加え、磁性部材は、粉末状の磁性体を樹脂に含ませた後枠型に加工した磁性フレームであってもよい。
【0016】
本発明によれば、放射部となる導体板の少なくとも周辺部を支持する絶縁性の支持部材に密着するように磁性部材を設けることにより、移動体通信用内蔵アンテナの側面に磁性部材が設けられることになるので、移動体通信用内蔵アンテナの側面から漏れ出る不要な電磁波がシールドされてSARが低減する。その結果、携帯型電話機の近傍の電磁波、特にスポット的に強い強度を有する電磁波を低減することができ、遠方界の電磁波にはほとんど影響を及ぼすことがない。
【0017】
また、本発明によれば、プリント配線基板の人体側、すなわち、移動体通信用端末の液晶ディスプレイ側に不透明な磁性体を配置する必要がないので、液晶ディスプレイ面積を小さくする必要がなくなる。また、電磁波の放射特性を考慮して設計し、内蔵アンテナと共に磁性部材を設計、製作することで、所望の放射特性、SAR対策の検討が容易になる。
【0018】
すなわち、磁性部材を用いることにより、アンテナ特性を劣化させることなく、SARを低減した移動体通信用内蔵アンテナが得られる。また、磁性部材が絶縁性になるように構成することにより、磁性体を流れる高周波電流がなくなるので、損失がなくなる。
【0019】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて詳述する。
【0020】
図1は本発明の移動体通信用内蔵アンテナの一実施の形態を示す外観斜視図であり、図2は図1に示した移動体通信用内蔵アンテナの拡散分解斜視図である。
【0021】
図1に示す移動体通信用アンテナ1は、プリント配線基板に取り付けられた状態を示しており、金属からなり放射部となる導体板2と、導体板2の周辺部を支持する絶縁性の支持部材11と、支持部材11に密着すると共に導体板2から所定の間隔(少なくとも1mm)を隔てて設けられた磁性部材としての磁性シート5とで構成されている。
【0022】
導体板2は、金属板(例えば金めっき銅板、銀めっき銅板、銅板等)が、図示しない金型によるプレス工程で打ち抜き加工された後、給電端子6及び短絡端子7を折り曲げる工程により作製される。導体板2には給電端子6及び短絡端子7が設けられており、略コの字形状の切り込み8が形成されている。導体板2に切り込み8が形成されていることにより、導体板2上を流れる電流が、この切り込み8を避けるように迂回するので、電流経路が長くなり、小型化することができる。切り込み8の形状は図に示した形状に限定されるものではなく、長さが使用される電磁波の波長の4分の1以下であればよい。また、切り込み8の代わりにスロットを形成してもよいが、スロットの場合にはその長さは、使用する電磁波の波長の2分の1以下とする必要がある。
【0023】
支持部材11には、例えばABS−PC(ABS「アクリロニトリル−ブタジエン−スチレン共重合体樹脂」とPC「ポリカーボネート樹脂」とを混合した樹脂)等のプラスチック材料が用いられる。支持部材11は、図ではコの字平面形状に成型されているが、本発明はこれに限定されるものではなく、二の字形状や枠状あるいは矩形板状等少なくとも導体板2の周辺部を支持するように成型されていればよい。
【0024】
導体板2を支持部材11に取り付ける方法としては、接着剤を用いて接着するか、あるいは予め支持部材11に形成された図示しない凸部に、予め導体板2に形成された図示しない貫通孔を貫通させ、貫通孔から露出した凸部を熱で溶かすことで融着する方法が用いられる。
【0025】
磁性シート5は、粉末状の磁性体(例えば、鉄、ニッケル、コバルト等の強磁性体)をシート状の樹脂(ビニル、ポリイミド等の高分子材料)内に混合させたものであり、支持部材11の導体2や地板3に対して垂直な面(側面)に設けられている。
【0026】
磁性シート5は、支持部材11の側面に接着剤で接着される。磁性シート5を支持部材11に接着するときには、磁性シート5が導体板2に接触(短絡)しないようにd1だけ離し、磁性シート5が地板3に接触しないようにd2だけ離す必要がある。同様に磁性シート5を給電端子6及び短絡端子7からd3、d4だけ離す必要がある。d1〜d4は少なくとも1mmであるのが好ましい。
【0027】
このようにして組み立てられた移動体通信用内蔵アンテナ1のアンテナ素子は、例えば携帯型電話機に用いられるプリント配線基板4に取り付けられるようになっている。
【0028】
プリント配線基板4は、基板9と、基板9の一方の面(図では表面)に形成された地板3と、基板9の他方の面(この場合裏面)に形成された配線パターンとを有する両面プリント基板が用いられるが、基板9の一方の面に配線パターンを有する片面プリント基板が用いられてもよい。地板3及び配線パターンは、例えば金めっき銅板、銀めっき銅板、銅板等が用いられ、基板9には例えばガラスエポキシ樹脂が用いられる。
【0029】
以上の移動体通信用内蔵アンテナ1は、所望の周波数で共振する板状逆Fアンテナとなっている。
【0030】
ここで、通常の内蔵アンテナでは、磁性体シートが用いられていないので、給電端子や短絡端子の近傍には、強い電磁波がホットスポット的に生じることが多い(共鳴現象)。また、プリント配線基板と導体板との間にも同様な現象が生じることがある。そこで、本発明の磁性シート5を支持部材11の側面に設けることで、電磁波強度が均一に緩和され、SAR値を低減させることができる。
【0031】
図3は本発明の移動体通信用内蔵アンテナの他の実施の形態を示す外観斜視図であり、図4は図3に示した移動体通信用内蔵アンテナの拡散分解斜視図である。
【0032】
尚、図1及び図2に示した部材と同様の部材には共通の符号を用いた。
【0033】
図3に示した移動体通信用内蔵アンテナ20と、図1に示した移動体通信用内蔵アンテナ1との相違点は、磁性部材として粉末状の磁性体を樹脂に含ませて枠型に加工した磁性フレーム21を用いた点である。
【0034】
この移動体通信用内蔵アンテナ20は、金属からなり放射部となる導体板2と、導体板2を支持する絶縁性の板状の支持部材22と、粉末状の磁性体を樹脂に含ませた後枠型に加工した磁性フレーム21とで構成されたものである。
【0035】
磁性フレーム21には、ABS−PC等のプラスチック材料に磁性体の粉末を含ませたプラスチック樹脂が用いられる。磁性フレーム21は支持部材22に組み合わされて接着される。磁性フレーム21を支持部材22に接着する方法としては、接着剤など簡易な方法が挙げられる。磁性フレーム21が組み合わされた支持部材22に導体板2が密着して取り付けられる。導体板2の支持部材22への取付方法は、図1に示した移動体通信用内蔵アンテナ1と同様に、接着剤を用いるか、予め支持部材22に形成した図示しない凸部に、予め導体板2に形成された図示しない貫通孔を貫通させ、貫通孔から露出した凸部を熱で溶かすことで融着する方法が用いられる。
【0036】
図3に示した移動体通信用内蔵アンテナ20は、図1に示した移動体通信用内蔵アンテナ1と同様な板状逆Fアンテナとなっており、図1に示した磁性シート5と同様の効果を、磁性フレーム21が示すので、電磁波強度が均一に緩和され、SAR値を低減することができる。また、図1に示した磁性シート5と比べて、厚みの大きい磁性フレーム21をプリント配線基板4上に配置することができるので、SAR値の低減効果は大きい。また、移動体通信用内蔵アンテナ20の組み立てについては、図1に示した移動体通信用内蔵アンテナ1の組み立てよりも容易である。
【0037】
【発明の効果】
以上要するに本発明によれば、アンテナ特性を劣化させることなくSARを低減させた移動体通信用内蔵アンテナの提供を実現することができる。
【図面の簡単な説明】
【図1】本発明の移動体通信用内蔵アンテナの一実施の形態を示す外観斜視図である。
【図2】図1に示した移動体通信用内蔵アンテナの拡散分解斜視図である。
【図3】本発明の移動体通信用内蔵アンテナの他の実施の形態を示す外観斜視図である。
【図4】図3に示した移動体通信用内蔵アンテナの拡散分解斜視図である。
【符号の説明】
1 移動体通信用内蔵アンテナ
2 導体板
3 地板
4 プリント配線基板
5 磁性シート
6 給電端子
7 短絡端子
8 切り込み
9 基板
11 支持部材
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile communication built-in antenna used for a mobile communication terminal such as a mobile phone.
[0002]
[Prior art]
With the development of mobile communication technology, more and more people use mobile wireless terminals, particularly mobile phones, more frequently. With the use of the portable telephone, it has been pointed out that electromagnetic waves emitted from the portable telephone have a great effect on the health of a person using the portable telephone.
[0003]
2. Description of the Related Art In recent years, as an effect of an electromagnetic wave generated by a mobile phone on a human body, a specific absorption rate (SAR: Specific Absorption Rate) of electromagnetic wave energy applied to a specific part of the human body has been required to be evaluated and suppressed to a certain value or less. ing.
[0004]
It is said that an electromagnetic wave generated from a portable telephone is strongest near an antenna feeding point. For this reason, wire-based external antennas such as a rod antenna and a helical antenna have been devised such that the antenna mounting position is kept away from a human body during a call. It is said that by using the built-in antenna for the external antenna, the antenna is located on the back side of the printed wiring board in the mobile phone when viewed from the human body side, so that the influence on the human body can be reduced.
[0005]
In addition, in order to reduce SAR, a method of suppressing electromagnetic waves near a human body by disposing a sheet-shaped magnetic body between a printed wiring board in a mobile phone and the human body has been studied (for example, see, for example). And Patent Document 1.).
[0006]
[Patent Document 1]
JP 2002-271468 A
[Problems to be solved by the invention]
By the way, in the above-described conventional technology, the SAR value of an external antenna such as a rod antenna or a helical antenna can be suppressed.
[0008]
However, it cannot be said that the built-in antenna is an effective technique. Although it has been considered to arrange a magnetic body between a printed wiring board and a human body (particularly the head), a liquid crystal display is usually arranged in a portion where a magnetic body is arranged in a portable telephone. Therefore, there is a limitation that an opaque magnetic material must be disposed on the liquid crystal display, and the area of the liquid crystal display must be reduced. Therefore, since a certain thickness and area are required, the magnetic body cannot be arranged as it is. When the magnetic body is arranged, the antenna must be reduced and the extension coil must be used, which deteriorates the antenna characteristics. There was a problem that would be.
[0009]
Therefore, an object of the present invention is to solve the above problems and provide a built-in antenna for mobile communication in which SAR is reduced without deteriorating antenna characteristics.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a conductor plate made of metal and serving as a radiating portion, an insulating support member that supports at least a peripheral portion of the conductor plate, and a conductor plate that is in close contact with the support member. This is a mobile communication built-in antenna including a magnetic member provided so as to be spaced apart therefrom.
[0011]
According to a second aspect of the present invention, in addition to the configuration according to the first aspect, it is preferable that a ground plate is disposed on the support member side so as to be parallel to the conductor plate and to be separated from the magnetic member.
[0012]
According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the magnetic member may be a magnetic sheet processed into a sheet after a powdered magnetic material is contained in a resin.
[0013]
According to a fourth aspect of the present invention, in addition to the configuration according to the third aspect, it is preferable that the magnetic sheet is provided in a strip shape on a surface perpendicular to the conductor plate of the support member.
[0014]
According to a fifth aspect of the present invention, in addition to the configuration according to any one of the second to fourth aspects, it is preferable that the magnetic sheet is provided at least 1 mm away from the conductor plate.
[0015]
According to a sixth aspect of the present invention, in addition to the configuration according to the first or second aspect, the magnetic member may be a magnetic frame processed into a rear frame shape by adding a powdery magnetic material to a resin.
[0016]
According to the present invention, the magnetic member is provided on the side surface of the built-in antenna for mobile communication by providing the magnetic member so as to be in close contact with the insulating support member that supports at least the peripheral portion of the conductor plate serving as the radiation portion. Therefore, unnecessary electromagnetic waves leaking from the side surface of the mobile communication built-in antenna are shielded, and SAR is reduced. As a result, electromagnetic waves in the vicinity of the mobile phone, particularly electromagnetic waves having a strong spot-like intensity, can be reduced, and have little effect on far-field electromagnetic waves.
[0017]
Further, according to the present invention, it is not necessary to arrange an opaque magnetic material on the human body side of the printed wiring board, that is, on the liquid crystal display side of the mobile communication terminal, so that it is not necessary to reduce the area of the liquid crystal display. In addition, by designing in consideration of the radiation characteristics of the electromagnetic wave, and designing and manufacturing the magnetic member together with the built-in antenna, it becomes easy to study desired radiation characteristics and SAR measures.
[0018]
That is, by using a magnetic member, a mobile communication built-in antenna with reduced SAR can be obtained without deteriorating antenna characteristics. Further, by configuring the magnetic member to be insulative, there is no high-frequency current flowing through the magnetic body, so that loss is eliminated.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0020]
FIG. 1 is an external perspective view showing an embodiment of the mobile communication built-in antenna of the present invention, and FIG. 2 is a diffused exploded perspective view of the mobile communication built-in antenna shown in FIG.
[0021]
The mobile communication antenna 1 shown in FIG. 1 shows a state in which the antenna 1 is attached to a printed wiring board. The antenna 1 is made of metal and serves as a radiating portion, and an insulating support for supporting the peripheral portion of the conductor plate 2. It is composed of a member 11 and a magnetic sheet 5 as a magnetic member provided in close contact with the support member 11 and at a predetermined distance (at least 1 mm) from the conductor plate 2.
[0022]
The conductive plate 2 is manufactured by punching a metal plate (for example, a gold-plated copper plate, a silver-plated copper plate, a copper plate, or the like) in a pressing process using a mold (not shown), and then bending the power supply terminal 6 and the short-circuit terminal 7. . A power supply terminal 6 and a short-circuit terminal 7 are provided on the conductor plate 2, and a substantially U-shaped cut 8 is formed. Since the cut 8 is formed in the conductive plate 2, the current flowing on the conductive plate 2 bypasses the cut 8 so as to avoid the cut 8, so that the current path becomes longer and the size can be reduced. The shape of the cut 8 is not limited to the shape shown in the drawing, and the length may be any length as long as it is not more than 4 of the wavelength of the electromagnetic wave used. Further, a slot may be formed instead of the notch 8, but in the case of the slot, its length needs to be half or less of the wavelength of the electromagnetic wave to be used.
[0023]
The support member 11 is made of a plastic material such as ABS-PC (a resin obtained by mixing ABS “acrylonitrile-butadiene-styrene copolymer resin” and PC “polycarbonate resin”). Although the support member 11 is formed in a U-shaped plane shape in the drawing, the present invention is not limited to this, and at least the peripheral portion of the conductor plate 2 such as a two-shape shape, a frame shape or a rectangular plate shape is used. What is necessary is just to be molded so that it may support.
[0024]
As a method of attaching the conductor plate 2 to the support member 11, the conductor plate 2 may be bonded using an adhesive, or a through hole (not shown) formed in the conductor plate 2 may be formed in a protrusion (not shown) formed in the support member 11 in advance. A method is used in which the protrusions are made to penetrate, and the protrusions exposed from the through holes are melted by heat to perform fusion.
[0025]
The magnetic sheet 5 is obtained by mixing a powdery magnetic material (for example, a ferromagnetic material such as iron, nickel, and cobalt) in a sheet-like resin (a polymer material such as vinyl and polyimide). It is provided on a surface (side surface) perpendicular to the eleventh conductor 2 and the ground plane 3.
[0026]
The magnetic sheet 5 is adhered to a side surface of the support member 11 with an adhesive. When bonding the magnetic sheet 5 to the support member 11, it is necessary to separate the magnetic sheet 5 by d1 so as not to contact (short circuit) the conductor plate 2 and to separate by d2 so that the magnetic sheet 5 does not contact the ground plate 3. Similarly, it is necessary to separate the magnetic sheet 5 from the power supply terminal 6 and the short-circuit terminal 7 by d3 and d4. d1 to d4 are preferably at least 1 mm.
[0027]
The antenna element of the mobile communication built-in antenna 1 assembled in this manner is mounted on a printed wiring board 4 used for, for example, a portable telephone.
[0028]
The printed wiring board 4 includes a substrate 9, a base plate 3 formed on one surface (the front surface in the figure) of the substrate 9, and a wiring pattern formed on the other surface (the back surface in this case) of the substrate 9. Although a printed circuit board is used, a single-sided printed circuit board having a wiring pattern on one surface of the substrate 9 may be used. For the base plate 3 and the wiring pattern, for example, a gold-plated copper plate, a silver-plated copper plate, a copper plate, or the like is used, and for the substrate 9, for example, a glass epoxy resin is used.
[0029]
The mobile communication built-in antenna 1 is a plate-shaped inverted-F antenna that resonates at a desired frequency.
[0030]
Here, in a normal built-in antenna, a magnetic sheet is not used, so that a strong electromagnetic wave often occurs in the vicinity of a feed terminal or a short-circuit terminal as a hot spot (resonance phenomenon). A similar phenomenon may occur between the printed wiring board and the conductive plate. Therefore, by providing the magnetic sheet 5 of the present invention on the side surface of the support member 11, the intensity of electromagnetic waves can be uniformly reduced, and the SAR value can be reduced.
[0031]
FIG. 3 is an external perspective view showing another embodiment of the mobile communication built-in antenna of the present invention, and FIG. 4 is a diffused exploded perspective view of the mobile communication built-in antenna shown in FIG.
[0032]
Note that common members are used for members similar to those shown in FIGS. 1 and 2.
[0033]
The difference between the mobile communication built-in antenna 20 shown in FIG. 3 and the mobile communication built-in antenna 1 shown in FIG. 1 is that a powdery magnetic material is contained in a resin as a magnetic member and processed into a frame shape. The point is that the magnetic frame 21 is used.
[0034]
The mobile communication built-in antenna 20 includes a conductor plate 2 made of metal and serving as a radiating portion, an insulating plate-like support member 22 for supporting the conductor plate 2, and a powdered magnetic material contained in resin. And a magnetic frame 21 processed into a rear frame type.
[0035]
For the magnetic frame 21, a plastic resin in which a magnetic material powder is added to a plastic material such as ABS-PC is used. The magnetic frame 21 is combined with and bonded to the support member 22. As a method of bonding the magnetic frame 21 to the support member 22, a simple method such as an adhesive is used. The conductor plate 2 is attached in close contact with the support member 22 combined with the magnetic frame 21. Similar to the mobile communication built-in antenna 1 shown in FIG. 1, the conductive plate 2 may be attached to the support member 22 by using an adhesive or by attaching a conductor to a convex portion (not shown) formed on the support member 22 in advance. A method is used in which a through hole (not shown) formed in the plate 2 is penetrated, and the convex portion exposed from the through hole is melted by heat to perform fusion.
[0036]
The mobile communication built-in antenna 20 shown in FIG. 3 is a plate-shaped inverted F antenna similar to the mobile communication built-in antenna 1 shown in FIG. 1, and is similar to the magnetic sheet 5 shown in FIG. Since the effect is shown by the magnetic frame 21, the intensity of the electromagnetic wave is uniformly reduced, and the SAR value can be reduced. Further, since the magnetic frame 21 having a large thickness can be arranged on the printed wiring board 4 as compared with the magnetic sheet 5 shown in FIG. 1, the effect of reducing the SAR value is large. The assembly of the mobile communication built-in antenna 20 is easier than the assembly of the mobile communication built-in antenna 1 shown in FIG.
[0037]
【The invention's effect】
In short, according to the present invention, it is possible to provide a mobile communication built-in antenna with reduced SAR without deteriorating antenna characteristics.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an embodiment of a mobile communication built-in antenna of the present invention.
FIG. 2 is an exploded perspective view of the mobile communication built-in antenna shown in FIG. 1;
FIG. 3 is an external perspective view showing another embodiment of the mobile communication built-in antenna of the present invention.
4 is an exploded perspective view of the mobile communication built-in antenna shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Built-in antenna for mobile communication 2 Conductor plate 3 Ground plate 4 Printed wiring board 5 Magnetic sheet 6 Feeding terminal 7 Shorting terminal 8 Cut 9 Board 11 Supporting member

Claims (6)

金属からなり放射部となる導体板と、該導体板の少なくとも周辺部を支持する絶縁性の支持部材と、該支持部材に密着すると共に上記導体板と離隔するように設けられた磁性部材とを備えたことを特徴とする移動体通信用内蔵アンテナ。A conductive plate made of metal and serving as a radiating portion, an insulating support member supporting at least a peripheral portion of the conductive plate, and a magnetic member provided so as to be in close contact with the support member and to be separated from the conductive plate A built-in antenna for mobile communication, comprising: 上記導体板と平行になると共に、上記磁性部材と離隔するように上記支持部材側に地板が配置されている請求項1に記載の移動体通信用内蔵アンテナ。2. The built-in antenna for mobile communication according to claim 1, wherein a ground plane is arranged on the support member side so as to be parallel to the conductor plate and separated from the magnetic member. 3. 上記磁性部材は、粉末状の磁性体を樹脂に含ませた後シート状に加工した磁性シートである請求項1または2に記載の移動体通信用内蔵アンテナ。The built-in antenna for mobile communication according to claim 1, wherein the magnetic member is a magnetic sheet processed into a sheet shape after a powdered magnetic material is contained in a resin. 上記磁性シートは、上記支持部材の上記導体板に対して垂直な面に帯状に設けられている請求項3に記載の移動体通信用内蔵アンテナ。The built-in antenna for mobile communication according to claim 3, wherein the magnetic sheet is provided in a strip shape on a surface of the support member perpendicular to the conductor plate. 上記磁性シートは、上記導体板から少なくとも1mm離れて設けられている請求項2から4のいずれかに記載の移動体通信用内蔵アンテナ。The built-in antenna for mobile communication according to claim 2, wherein the magnetic sheet is provided at least 1 mm away from the conductor plate. 上記磁性部材は、粉末状の磁性体を樹脂に含ませた後枠型に加工した磁性フレームである請求項1または2に記載の移動体通信用内蔵アンテナ。3. The built-in antenna for mobile communication according to claim 1, wherein the magnetic member is a magnetic frame processed into a rear frame shape in which a powdery magnetic material is contained in a resin.
JP2003033810A 2003-02-12 2003-02-12 Built-in antenna for mobile communication Pending JP2004247851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003033810A JP2004247851A (en) 2003-02-12 2003-02-12 Built-in antenna for mobile communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003033810A JP2004247851A (en) 2003-02-12 2003-02-12 Built-in antenna for mobile communication

Publications (1)

Publication Number Publication Date
JP2004247851A true JP2004247851A (en) 2004-09-02

Family

ID=33019684

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003033810A Pending JP2004247851A (en) 2003-02-12 2003-02-12 Built-in antenna for mobile communication

Country Status (1)

Country Link
JP (1) JP2004247851A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101276651B1 (en) 2011-09-16 2013-06-19 주식회사 이엠따블유 Antenna device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101276651B1 (en) 2011-09-16 2013-06-19 주식회사 이엠따블유 Antenna device

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