JP2012190920A - アンテナ用磁性材料、並びに、アンテナ及び無線通信機器 - Google Patents
アンテナ用磁性材料、並びに、アンテナ及び無線通信機器 Download PDFInfo
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- JP2012190920A JP2012190920A JP2011051829A JP2011051829A JP2012190920A JP 2012190920 A JP2012190920 A JP 2012190920A JP 2011051829 A JP2011051829 A JP 2011051829A JP 2011051829 A JP2011051829 A JP 2011051829A JP 2012190920 A JP2012190920 A JP 2012190920A
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
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- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
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Abstract
【解決手段】一般式(1):MA・Fe12−x・MBx・O19(式中、MAは、Sr及びBaからなる群より選択される少なくとも1種であり、MBは、MC又はMDであり、MCは、Al、Cr、Sc及びInからなる群より選択される少なくとも1種であり、MDは、Ti、Sn及びZrからなる群より選択される少なくとも1種と、Ni、Zn、Mn、Mg、Cu及びCoからなる群より選択される少なくとも1種との等量混合物であり、Xは、1以上5以下の数である。)で表されるM型六方晶フェライトを主相として含み、且つ、平均結晶粒子径が5μm以上である、アンテナ用磁性材料。
【選択図】図1
Description
MA・Fe12−x・MBx・O19 ・・・(1)
で表されるM型六方晶フェライトを主相として含み、且つ、平均結晶粒子径が5μm以上のものである。
本実施形態のアンテナ用磁性材料は、主相としてM型六方晶フェライトを含有しており、且つ、平均結晶粒子径D50が5μm以上とされている。そのM型六方晶フェライトは、下記式(1);
MA・Fe12−x・MBx・O19 ・・・(1)
で表され、式中、「MA」は、Sr及びBaからなる群より選択される少なくとも1種の金属元素を示し、「MB」は、MC又はMDを示し、「MC」は、Al、Cr、Sc及びInからなる群より選択される少なくとも1種の金属元素を示し、「MD」は、Ti、Sn及びZrからなる群より選択される少なくとも1種の金属元素と、Ni、Zn、Mn、Mg、Cu及びCoからなる群より選択される少なくとも1種の金属元素との等モル量混合物を示し、Xは、1以上5以下の数である。
次に、図1は、本発明のアンテナ用磁性材料を用いて形成されるアンテナの好適な一実施形態の構成を概念的に示す斜視図である。アンテナ1は、基体2の表面及び/又は内部に少なくとも1つの導体4が形成されたものである。この基体2は、上述した本実施形態のアンテナ用磁性材料を用いて形成されており、その形状は、特に限定されず、無線通信機器に搭載する際に求められる種々の形状を採用することができ、一般的には、例えば、図1に示すような直方体ブロック状のもの等が好ましく用いられる。
図2は、本発明のアンテナ用磁性材料を用いたアンテナを備える無線通信機器の好適な一実施形態の概略構成を示す平面図(正面図)である。無線通信機器である携帯電話機10は、第1筐体10CAと第2筐体10CBとがヒンジ13で連結された折り畳み式の携帯端末の一種であり、その使用周波数帯域が、例えば2GHz帯のものである。第2筐体10CBの内部において、ヒンジ13側の反対側に位置する端部には、第1アンテナ11(アンテナ)が配置されている。この第1アンテナ11は、携帯電話機10の無線通信に供される送受信アンテナであり、携帯電話機10と基地局との間で、通話や電子メール等のデータ交換を行うための電波の送受信に用いられる。
それぞれ表1及び表2に示すMA及びMBを同表にxで示す組成比で含むM型六方晶フェライト粉と、必要に応じて同表に示す含有割合の添加物(SiO2、CaO、及び、Bi2O3の少なくとも1種)とを含むアンテナ用磁性材料としての各原料粉末を調製し、各実施例及び各比較例の物性及び特性評価用試料(焼結体)を作製した。なお、原料粉末は、各材料の湿式混合を鋼鉄製ボールミルで16時間かけて行い、その混合粉を大気中、1200℃で2時間仮焼してから、それに上記添加物を加えた後、鉄鋼製ボールミルで16時間粉砕することにより調製した。また、原料粉末の焼成処理は、原料粉末を造粒したものを100MPaの圧力で所定の形状に成形した後、その成形体を大気中、1100〜1380℃の温度(実施例1では1200℃、実施例2では1250℃、実施例3では1350℃とし、他のものはこれらを指標として目的とする平均結晶粒子径に応じて微調整した。)で2時間行った。なお、実施例13および実施例25〜27においては、実施例5の原料粉末を用い、さらに、焼失剤(平均粒径10μmのポリスチレン)を用いて所望の空隙率に調整した。
式CaTiO3をベースとした誘電粉、及び、式Ba2Co2Fe12O22で表されるY型六方晶フェライト粉を原料粉末として用いたこと以外は、上記の実施例及び比較例と同様にして、参考例1及び2の物性及び特性評価用試料(焼結体)を作製した。
<平均結晶粒子径>
平均結晶粒子径は、濃塩酸でエッチング後の焼結体試料表面を、走査型電子顕微鏡にて観察し、N=50個の平均から求めた。
調製した各原料粉末の焼結体からリング状試料(外径7mm×内径3.04mm×厚さ1〜2mm)を各々成形加工し、得られた各リング状試料の室温25℃における複素比透磁率μrの実数部μr’、虚数部μr’’、及び、磁気損失tanδμを、ネットワークアナライザ(Agilent社製:HP8510C)を用いて測定した周波数0.1〜18GHzにおけるSパラメーターの結果から導出した。また、調製した各原料粉末の焼結体から棒状試料(1mm×1mm×80mm)を各々成形加工し、得られた各棒状試料の室温25℃における複素比誘電率εrの実数部εr’、虚数部εr’’、及び、誘電損失tanδεを、同ネットワークアナライザを用いて、周波数2GHzにおいて空洞共振器摂動法により測定した。
調製した各原料粉末の焼結体から直方体ブロック状試料(10mm×3mm×4mm)を各々成形加工し、得られた各直方体ブロック状試料の表面に電極を形成して(なお、それぞれの試料によって電極パターンを適宜調整した。)、図1に示すものと略同等の構成を有する、共振周波数が1.5GHzである各チップ型アンテナを作製した。得られたチップ型アンテナをそれぞれ平面基板に実装し、電極の一端を給電電極に接続した状態で、小型3D放射指向性測定機(SATIMO社製:STARLAB)を用いて測定した放射効率から、最大放射効率と帯域幅(放射効率が50%以上となる1.5GHzを中心とした周波数の範囲)を評価した。
空隙率は、濃塩酸でエッチング後の焼結体試料表面を走査型電子顕微鏡にて観察し、空隙の占有する面積を画像解析処理にて算出した後、空隙形状を球形と見なした上で2/3を乗じで体積占有率に換算した。
また、実施例5、実施例13及び実施例25〜27の比較から、空隙率が1〜40%に調整されたものは、そうでないものに比して、最大放射効率と帯域幅が格別に高められており、アンテナ効率に殊に優れることが確認された。
Claims (8)
- 下記一般式(1)で表されるM型六方晶フェライトを主相として含み、
MA・Fe12−x・MBx・O19 ・・・(1)
(式中、MAは、Sr及びBaからなる群より選択される少なくとも1種であり、MBは、MC又はMDであり、MCは、Al、Cr、Sc及びInからなる群より選択される少なくとも1種であり、MDは、Ti、Sn及びZrからなる群より選択される少なくとも1種と、Ni、Zn、Mn、Mg、Cu及びCoからなる群より選択される少なくとも1種との等量混合物であり、Xは、1以上5以下の数である。)
平均結晶粒子径が5μm以上である、
アンテナ用磁性材料。 - 0.1〜3質量%のSiO2、0.5〜5質量%のCaO、及び、0.5〜8質量%のBi2O3からなる群より選択される少なくとも1種をさらに含有する、
請求項1記載のアンテナ用磁性材料。 - 自然共鳴周波数f0(n)が5GHz以上であり、且つ、磁壁共鳴周波数f0(d・w)が0.8GHz以下である、
請求項1又は2に記載のアンテナ用磁性材料。 - 2GHzにおける複素比透磁率実数部が1.2以上であり、且つ、2GHzにおける磁気損失が0.01以下である、
請求項1〜3のいずれか一項に記載のアンテナ用磁性材料。 - 2GHzにおける複素比誘電率実数部が30以下であり、且つ、2GHzにおける誘電損失が0.05以下である、
請求項1〜4のいずれか一項に記載のアンテナ用磁性材料。 - 請求項1〜5のいずれか一項に記載のアンテナ用磁性材料を含む基体と、
前記基体の表面又は内部に設けられた導体と、
前記導体に接続されており、且つ、該導体に電気エネルギを供給する給電端子と、
を備えるアンテナ。 - 前記基体は、空隙率が1〜40%の焼結体である、
請求項6に記載のアンテナ。 - 請求項6又は7に記載のアンテナを備える、
無線通信機器。
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JP5853381B2 (ja) | 2016-02-09 |
US9424968B2 (en) | 2016-08-23 |
CN102682947A (zh) | 2012-09-19 |
US20120229354A1 (en) | 2012-09-13 |
DE102012203536A1 (de) | 2012-09-13 |
CN102682947B (zh) | 2015-08-05 |
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