JP3697410B2 - Non-reciprocal circuit element - Google Patents

Non-reciprocal circuit element Download PDF

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JP3697410B2
JP3697410B2 JP2001356617A JP2001356617A JP3697410B2 JP 3697410 B2 JP3697410 B2 JP 3697410B2 JP 2001356617 A JP2001356617 A JP 2001356617A JP 2001356617 A JP2001356617 A JP 2001356617A JP 3697410 B2 JP3697410 B2 JP 3697410B2
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magnetic substrate
conductor
substrate
magnetic
line conductor
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JP2003158403A (en
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祐一 清水
晃 境
人司 大西
利男 高橋
栄一 駒井
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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【０００１】
【発明の属する技術分野】
本発明は、マイクロ波帯などの高周波帯域で使用されるアイソレータ、サーキュレータ等、非可逆回路素子に関する。
【０００２】
【従来の技術】
この種のアイソレータに用いられている非可逆回路素子は、例えば図１４に示す構造の磁性組立体５０が備えられている。この磁性組立体５０は、矩形板状のフェライトからなる磁性体基板５５と、その下面に添わせて設けられた金属板からなる共通電極５４と、この共通電極５４から放射状に３方向に延出形成されて磁性体基板５５の表面側に巻き掛けられた第１の中心導体５１と第２の中心導体５２と第３の中心導体５３とから構成されている。
前記第１の中心導体５１と第２の中心導体５２と第３の中心導体５３は互いに磁性体基板５５の隅に沿って折り曲げられ、磁性体基板５５の表面側において互いに略１２０゜の交差角度でもって重ねられている。なお、図面では省略されているが、中心導体５１、５２、５３どうしは絶縁シートにより磁性体基板５５の表面側において個々に絶縁されている。
【０００３】
先の３つの中心導体５１、５２、５３の先端部側は磁性体基板５５の側方に突出するように配置されて各ポート部Ｐ１、Ｐ２、Ｐ３とされている。そして、各ポート部Ｐ１〜Ｐ３に図示略の整合用のコンデンサを接続し、ポート部の１つに先のコンデンサを介して終端抵抗を接続し、これらを永久磁石とともに磁気回路を構成する磁性体ヨーク内に収納し、磁性組立体５０に別途配置した永久磁石で直流磁界を印加できる構成とすることでアイソレータが構成される。
前述の各中心導体５１〜５３は、図１５の展開図で示すようにアース部となる共通電極５４において連設一体化され、共通電極５４から３方向に突出形成されていて、これらの中心導体５１〜５３は前記磁性体基板５５に対して所定の角度で精度良く組み付けられるように図１５の折曲部Ｘの位置において屈曲されるように構成されている。
【０００４】
図１６に先の種類の磁性組立体を備えた一般的なアイソレータの一構造例を示す。図１６に示すアイソレータ６０は、下ケース６１と上ケース６２との間に磁石部材６３とスペーサ部材６４と磁性組立体６５とコンデンサ基板６６、６７、６８と終端抵抗６９と基板７０とを介在させて構成されている。この例の磁性組立体６５は先の例の磁性組立体５０と同様に、磁性体基板７２とそれを囲んで配置された中心導体７３、７４、７５とから構成され、各中心導体７３、７４、７５がスリットにより個々に２分割されている。なお、この例では磁性体基板７２が円盤型とされているが、磁性体基板はこの例のような円盤型であっても先の例のような長方形板状であっても差し支えない。
また、前記基板７０の上には、薄板状のコンデンサ基板６６、６７、６８がコ字型に配置され、これらコンデンサ基板６６、６７、６８の内側に磁性組立体６５が配置され、磁性組立体６５の中心導体７３、７４、７５の各端部７３ａ、７４ａ、７５ａが磁性体基板７２の側方に延出されていて、各端部７３ａ、７４ａ、７５ａがそれらの下に位置するコンデンサ基板６６、６７、６８に半田付けされて接合されている。また、これらの上側には、凸部６４ａ、６４ａを有する板状のスペーサ部材６４が配置され、そのスペーサ部材６４の上に磁石部材６３が配置されている。
【０００５】
【発明が解決しようとする課題】
前記従来構成のアイソレータ６０にあっては、磁性組立体６５を組み立ててから基板７０の中心部に配置し、磁性組立体６５から側方に突出された各端部７３ａ、７４ａ、７５ａをスペーサ部材６４の各凸部６４ａでコンデンサ基板上に押さえ付け、このスペーサ部材６４で押さえ付けた状態で半田付けのためのリフロー法により溶融半田に全体を浸漬して各端部７３ａ、７４ａ、７５ａとコンデンサ基板６７、６６、６８とを半田付けする関係から、スペーサ部材６４を２６０℃程度の温度で数秒間耐える液晶ポリマー等の耐熱性の樹脂から構成している。
【０００６】
ところで図１６に示すアイソレータ６０にあっては、磁性組立体６５において３本の中心導体７３、７４、７５が磁性体基板７２の上面側中心部分で重ねられているために、磁性体基板７２の上面側中心部分に中心導体７３、７４、７５が重ねられて山状に盛り上がった部分が生じている。これらの中心導体７３、７４、７５は、金属薄板の打ち抜き材からなり、ある程度の厚みを有するが、中心導体７３、７４、７５が３本重ねられた部分は山状に盛り上がった部分として磁性体基板７２上に形成され、中心導体７３、７４、７５が磁性体基板７２の上面に対して密着されずに単に軽く巻かれただけの状態とされていた。
【０００７】
ところが、磁性体基板７２に対する中心導体７３、７４、７５の密着状態はアイソレータとしての損失増大に関係があり、例えば、３本の中心導体７３、７４、７５が山状に重ねられた部分においては、磁性体基板７２に最も近い側の中心導体に対して磁性体基板７２から最も離れた側の中心導体の線路長が相対的に長くなってしまう問題があり、このように中心導体どうしの実効的な線路長が異なるようでは、損失が増大してアイソレータとして設計通りの性能を発揮させることが難しいという問題があった。また、中心導体７３、７４、７５が複数重なる部分では、中心導体の底面側の平坦度を確保し難いという問題も有している。
また、中心導体７３〜７５による山状の重なり部分が磁性体基板７２の上に存在するということは、それらの上に重ねられるスペーサ部材６４と磁石部材６３の平行度を高めることが難しいということも意味しており、磁石部材６３によって磁性体基板７２に磁界を印加する場合に均一な磁界を印加できなくなるおそれもあった。
また、この種のアイソレータは近年の高周波回路の小型化に伴い、全体として４〜５ｍｍ角程度の大きさに形成されるようになってきているが、このような微細な部品において先の中心導体７３〜７５の山状の重なり部分を生じることでアイソレータ全体としての薄型化の推進に悪影響を及ぼすおそれもある。
【０００８】
本発明は以上の背景に基づいてなされたもので、磁性体基板に対して線路導体あるいは中心導体を緊密に巻き付けて磁性組立体を得ることができ、よって特性が良好な非可逆回路素子とアイソレータを提供することを目的の１つとする。
本発明は、磁性体基板の周囲に配する線路導体の山状の重なり部分をできるだけ小さくすることでスペーサ部材を介して配置する磁石部材と磁性体基板との平衡度を確保し、よって特性が良好な非可逆回路素子とアイソレータを提供することを目的の１つとする。
【０００９】
【課題を解決するための手段】
本発明は前記課題を解決するために、長方形のケース状のヨークの内部に、長方形状の磁性体基板と、該磁性体基板表面側の対角線に沿って配置される第１の線路導体と、該磁性体基板表面側の別の対角線に沿って配置される第２の線路導体と、該磁性体基板表面側の中央部に沿って配置される第３の線路導体と、前記磁性体基板の側方に配置される長方形状の複数のコンデンサ基板と、前記磁性体基板に対して磁界を印加するための磁石部材とが具備されてなり、前記第１の線路導体の先端に設けられた第１の線路導体の先端導体が、前記磁性体基板の一方の長辺側の一側端部において前記第１の線路導体の向きから方向を変えられて前記磁性体基板の短辺の延長線とヨーク内面に沿って設けられ、前記第２の線路導体の先端に設けられた第２の線路導体の先端導体が、前記磁性体基板の一方の長辺側の他側端部において前記第２の線路導体の向きから方向を変えられて前記磁性体基板の別の短辺の延長線とヨーク内面に沿って設けられ、前記複数の線路導体の各端部が前記コンデンサ基板に接続されてなり、前記磁性体基板の長辺に沿って前記磁性体基板の両側に前記コンデンサ基板が収納され、前記磁性体基板の短辺方向において、前記磁性体基板の幅が、前記ヨークの内幅よりも小さくなるように、磁性体基板の縦横比が２５％（１：４）以上、８０％（４：５）以下の範囲で形成され、前記磁性体基板の長辺方向において、磁性体基板の長さと前記ヨークの内幅がほぼ同じであることを特徴とする。
【００１０】
長方形状のケース状のヨークの内部に該ヨークよりも幅の小さい長方形状の磁性体基板を設け、その幅方向両側に長方形状のコンデンサ基板を収納してなるので、ヨーク内部の磁性体基板の周りの空間部にコンデンサ基板を収容することができる。
【００１１】
本発明は前記課題を解決するために、前記磁性体基板の幅方向両側に配置された２つの前記コンデンサ基板のうち、一方の前記コンデンサ基板が前記複数の線路導体に接続された共通のコンデンサ基板とされ、該コンデンサ基板の両端部のうちの一方の端部に前記第１の線路導体の先端導体が、他方の端部に前記第２の線路導体の先端導体が接続されたことを特徴とする。
【００１２】
共通のコンデンサ基板とすることで必要とする容量を小さなコンデンサ占有面積で稼ぐことができる。
【００２０】
【発明の実施の形態】
以下に本発明を更に詳細に説明する。
図１〜図６は本発明に係る非可逆回路素子の一例であるアイソレータの第１の実施の形態を示すもので、この形態のアイソレータ１は、上ヨーク２と下ヨーク３とからケース状に構成されたヨーク（閉磁気回路）内に、永久磁石などからなる磁石部材４と強磁性体からなる磁性体基板５と線路導体６、７、８とこれら線路導体６、７、８を接続した共通電極１０と磁性体基板５の周囲に配置されたコンデンサ基板１１、１２と終端抵抗（抵抗素子）１３とを備えて構成されている。
【００２１】
前記上ヨーク２と下ヨーク３は軟鉄などの強磁性体からなり、図４と図５に示すように４角形状のケース状に形成されている。なお、それらヨークの表裏面にはＡｇメッキなどの導電層が被覆形成されていることが好ましい。また、側面視略コ字型の上ヨーク２は側面視略コ字型の下ヨーク３に嵌め込み自在の大きさとされており、上ヨーク２と下ヨーク３の互いの開口部分を嵌め合わせることで両者を一体としてケース状のヨーク（磁気閉回路）を構成することができるように構成されている。
即ち、下ヨーク３は図４に示すように平面視矩形状の底板３ａとこの底板３ａの相対向する２辺側に立設された側壁部３ｂとから構成される側面コ字型に形成されるとともに、上ヨーク２は図５に示すように平面矩形状の天板２ａとこの天板２ａの相対向する２辺側に立設された側壁部２ｂとから構成される側面コ字型に形成され、上ヨーク２の側壁部２ｂ、２ｂと下ヨーク３の側壁部３ｂ、３ｂとを互い違いに配置してヨーク２、３を嵌め合わせることでケース状の磁気閉回路が構成されてるように形成されている。なお、これらのヨーク２、３の形状はこの実施形態の如くコ字型に限るものではなく、複数のヨークでケース状の閉磁器回路を構成するものであれば、任意の形状で差し支えない。
【００２２】
前記の如く嵌め合わされた下ヨーク２と上ヨーク３が囲む空間には、換言すると下ヨーク２と上ヨーク３からなる閉磁気回路内には、先の磁性体基板５と３本の線路導体６、７、８とこれら線路動体６、７、８を接続した共通電極１０とからなる磁性組立体１５が収納されている。
前記磁性体基板５は、フェライト等の強磁性体からなり、図２に示すように平面視横長の略長方形板状とされている。より詳細には磁性体基板５は、相対向する横長の２つの長辺５ａ、５ａと、これらの長辺５ａ、５ａに直角向きの短辺５ｂ、５ｂと、前記長辺５ａ、５ａの両端部側に位置して各長辺５ａに対して１５０゜の角度で傾斜し（長辺５ａの延長線に対しては３０°の傾斜角度で傾斜し）、個々に先の短辺５ｂに接続する４つの傾斜辺５ｃとから構成される平面視横長の略長方形状とされている。従って磁性体基板５の平面視４つのコーナ部には、それぞれ長辺５ａに対する１５０°傾斜（短辺５ｂに対して１３０°傾斜）の傾斜面（受面）５ｄが形成されている。
【００２３】
また、この磁性体基板５においては、その横方向、即ち長手方向の幅と、その縦方向、即ち長手方向に直交する方向の幅との比、即ち縦横比が２５％（１：４）以上、８０％（４：５）以下の範囲、即ち平面視横長であることが好ましい。
なお、ここで、図１に示すものは平面視横長の磁性体基板５であるが、図１を９０゜回転させた横方向から見ると、磁性体基板５は縦長形状となる。よって本発明では、磁性体基板５は横長形状でも縦長形状でも全く等価のものと考える。
【００２４】
先の３本の線路導体６、７、８と共通電極１０は図３の展開図に示すように一体化されてなり、３本の線路導体６、７、８と共通電極１０とを主体として電極部１６が構成されている。この共通電極１０は、平面視先の磁性体基板５とほぼ相似形状の金属板からなる本体部１０Ａから構成されている。即ち、本体部１０Ａは相対向する２つの長辺部１０ａ、１０ａと、これらの長辺部１０ａ、１０ａに直角向きの短辺部１０ｂ、１０ｂと、前記長辺部１０ａ、１０ａの両端部側に位置して各長辺部１０ａに対して１５０°の角度で傾斜し、先の短辺部１０ｂに対しては１３０°の傾斜角度で接続する４つの傾斜部１０ｃとから構成される平面視略長方形（矩形状）とされている。
【００２５】
そして、先の共通電極１０の４つのコーナ部の傾斜部１０ｃのうち、一方の長辺部側の２つの傾斜部１０ｃから第１の線路導体６と第２の線路導体７が延出形成されている。まず、先の２つの傾斜部１０ｃの一方から、第１の基部導体６ａと第１の中心導体６ｂと第１の先端部導体６ｃからなる第１の線路導体６が延出形成される一方、先の傾斜部１０ｃの他方から、第２の基部導体７ａと第２の中心導体７ｂと第２の先端部導体７ｃとからなる第２の線路導体７が延出形成されている。前記基部導体６ａ、７ａはいずれも傾斜部１０ｃを延長するように傾斜部１０ｃと同じ幅に形成されていて、基部導体６ａ、７ａはそれらの中心軸線を共通電極１０の長辺部１０ａに対して１５０゜の傾斜角度で傾斜させて設けられている。次に、前記中心導体６ｂ、７ｂはいずれも共通電極１０の短辺部１０ｂに対して平行に、換言すると基部導体６ａ、７ａの中心軸線（長さ方向）に対して１５０゜の傾斜角度で形成され、更に先端部導体６ｃ、７ｃはいずれも共通電極１０の長辺部１０ａに対して１５０゜傾斜とされている。
これらのことから、接続導体６ａ、７ａの中心軸線どうしがなす角度θ１は図３に示すように６０°とされており、先端部導体６ｃ、６ｃの中心軸線どうしがなす角度θ２は図３に示すように１２０゜とされている。
【００２６】
次に、前記第１の線路導体６の幅方向中央部には、共通電極１０の外周部から基部導体６ａと中心導体６ｂを通過し先端部導体６ｃの基端部まで到達するスリット部１８が形成され、このスリット部１８を形成することにより中央部導体６ｂが２本の分割導体６ｂ１、６ｂ２に分割され、基部導体６ａも２本の分割導体６ａ１、６ａ２に分割され、前記第２の線路導体７の幅方向中央部にも同様のスリット部１９が形成され、このスリット部１９を形成することにより中央部導体７ｂが２本の分割導体７ｂ１、７ｂ２に分割され、基部導体７ａも２本の分割導体７ａ１、７ａ２に分割されている。
前記スリット部１８の共通電極１０側の端部は接続導体６ａを通過して共通電極１０の外周部から若干深い位置まで到達することで凹部１８ａを形成し、第１の線路導体６の線路長を若干長くしているとともに、前記スリット部１９の共通電極１０側の端部も接続導体７ａを通過して共通電極１０の外周部まで到達することで凹部１９ａを形成し、第２の線路導体７の線路長を若干長くしている。
【００２７】
一方、前記共通電極１０の他方の長辺部１０ａ側の中央部に第３の線路導体８が延設されている。この第３の線路導体８は共通電極１０から突出形成された第３の基部導体８ａと第３の中心導体８ｂと第３の先端部導体８ｃとから構成されている。前記第３の基部導体８ａは、共通電極１０の長辺側中央部からほぼ直角に延出形成された２本の短冊状の分割導体８ａ１、８ａ２からなり、２本の分割導体８ａ１、８ａ２の間にはスリット２０が形成されている。前記第３の中心導体８ｂは、先の分割導体８ａ１に接続する平面視Ｌ字状の分割導体８ｂ１と先の分割導体８ａ２に接続する平面視Ｌ字状の分割導体８ｂ２とからなり、分割導体８ｂ１と分割導体８ｂ２は、これら分割導体８ａ１、８ａ２の実質的な導体長を長くするために、互いの中央部を離間するようにして分割導体８ａ１、８ａ２から延設され、分割導体８ｂ１と８ｂ２とから菱形の中心導体８ｂが構成されている。
【００２８】
更に、これらの分割導体８ｂ１、８ｂ２の先端側はＬ字型の第３の先端部導体８ｃに一体化されている。この第３の先端部導体８ｃは、先の分割導体８ｂ１、８ｂ２を一体化して先の分割導体８ａ１、８ａ２と同じ方向に向けて延出形成された接続部８ｃ１とこの接続部８ｃ１に対してほぼ直角方向に延出形成された接続部８ｃ２とから構成されている。
【００２９】
次に、前記共通電極１０の一方の長辺部１０ａ側において、第３の線路導体８の分割導体８ａ１、８ａ２の両側部分には、共通電極１０の長辺部１０ａを一部切り欠く形で３つの凹部１０ｅが形成され、これらの凹部１０ｅを形成することで第３の線路導体８の線路長が若干長くされている。更に、前記共通電極１０の一方の長辺部１０ａにおいて３つの凹部１０ｅのうちの両側２つの凹部１０ｅの外側、換言すると凹部１０ｅと傾斜部１０ｃとの間の部分に、先の分割導体８ａ１、８ａ２と平行な向きに台形型の支持片２１が延出形成されるとともに、共通電極１０の他方の長辺部１０ａ側の中央部にも平面視長方形状の支持片２２が延出形成されている。これら支持片２１、２２はコンデンサ基板１１、１２のアース電極とされており、コンデンサ基板１１、１２の一面に電気的に接続され、更に他面側は後述するように各先端部導体６ｃ、７ｃ、８ｃと電気的に接続されている。
【００３０】
前記の如く構成された共通電極１０は、その本体部１０Ａを磁性体基板５の裏面側（一面側）に添わせ、第１の線路導体６と第２の線路導体７と第３の線路導体８とを磁性体基板５の表面側（他面側）に折り曲げて磁性体基板５に装着され、磁性体基板５とともに磁性組立体１５を構成している。即ち、第１の線路導体６の分割導体６ａ１、６ａ２を磁性体基板５の１つの傾斜面５ｄの縁に沿って折り曲げ、第２の線路導体７の分割導体７ａ１、７ａ２を磁性体基板５の他の１つの傾斜面５ｄの縁に沿って折り曲げ、第３の線路導体８の分割導体８ａ１、８ａ２を磁性体基板５の長辺５ａの縁に沿って折り曲げ、第１の線路導体６の中心導体６ａを磁性体基板５の表面側（他面側）に磁性体基板表面側の対角線に沿って添わせ、第２の線路導体７の中心導体７ｂを磁性体基板５の表面側（他面側）に磁性体基板表面の対角線に沿って添わせ、更に第３の線路導体８の中心導体８ｂを磁性体基板５の表面部の中央部分に沿って添わせることで共通電極１０が磁性体基板５に装着されて磁性組立体１５とされている。
【００３１】
なお、ここで記載されている対角線とは、図２に示すように磁性体基板５を平面視した場合に、各長辺５ａと各短辺５ｂとの延長線が交わる位置を略長方形状の磁性体基板５の頂点と仮定し、これら４つの頂点のうち、対向する頂点どうしを結ぶ線分を対角線Ｌ１、Ｌ２と定義する。
更に、前記導体部８ｂ１、８ｂ２は磁性体基板５の表面側に配置されるが、磁性体基板５の表面側に添わせられる分割導体８ｂ１あるいは分割導体８ｂ２の長さは図２に示す磁性体基板５の縦幅（横長長方形状の磁性体基板５の幅方向に沿う幅）の１０５％以上とすることが好ましい。このようにすることで分割導体８ｂ１、８ｂ２の実質的な導体長を長くして非可逆回路素子としての低周波化と小型化を両立させることが可能となる。
【００３２】
以上のように第１〜第３の線路導体６、７、８を磁性体基板５の表面側に装着することで、図１Ａに示すように第１の線路導体６と第２の線路導体７は個々に磁性体基板５の対角線Ｌ１、Ｌ２に沿って重ねて配置され、第１の中心導体６ｂと第２の中心導体７ｂは磁性体基板５の表面上において平面視１２０゜の傾斜角度で交差されて重ねられている。また、第１〜第３の中心導体６ｂ、７ｂ、８ｂの重なり状態において、第１の中心導体６ｂの分割導体６ｂ１、６ｂ２と、第２の中心導体７ｂの分割導体７ｂ１、７ｂ２とが重ねられた部分は、磁性体基板５の表面側において平面視的に全て位置ずれされて配置され、分割導体６ｂ１、６ｂ２と分割導体７ｂ１、７ｂ２とが重ねられた部分は磁性体基板５の表面上において重ならないように配置されている。
【００３３】
さらに、分割導体６ｂ１、６ｂ２と分割導体７ｂ１、７ｂ２とが重ねられた部分に対してこれらの部分を避けるように第３の中心導体８ｂの分割導体８ｂ１、８ｂ２が配置されている。従って、磁性体基板５の表面上において、分割導体６ｂ１、６ｂ２と分割導体７ｂ１、７ｂ２と分割導体８ｂ１、８ｂ２がこれらの組み合わせのうち、２本重なって配置されることはあっても、３本が重ねられる部分は生じないように配置されている。
なお、図１（Ａ）では略したが、磁性体基板５と第１の線路導体６と第２の線路導体７と第３の線路導体８との間には各々に図１（Ｂ）に簡略的に示すように絶縁シートＺが介在されて各線路導体６、７、８は個々に電気的に絶縁されている。
【００３４】
次に、前記磁性組立体１５は下ヨーク３の底部中央側に配置され、下ヨーク３の底部側の磁性組立体１５の両側部分には平面視細長で先の磁性体基板５の半分程度の厚さの板状のコンデンサ基板１１、１２が収納され、コンデンサ基板１２の一側部側には終端抵抗１３が収納されている。より詳細には、先の磁性組立体１５の磁性体基板５の長さが下ヨーク３の内幅とほぼ同じに形成され、磁性体基板５の幅（長手方向に直交する方向の幅）が下ヨーク３の内幅よりも小さく形成されているので、磁性体基板５を下ヨーク３の内部に図１に示すように平面視横長になるように収納した状態において、磁性体基板５の幅方向両側には図１に示すようにコンデンサ基板１１、１２を収納可能な空間部が形成され、それらの空間部に薄板型のコンデンサ基板１１、１２とチップ状の終端抵抗（抵抗素子）１３が収納されている。
更に、コンデンサ基板１１の下側には共通電極１０の支持片２１、２１が配置され、電気的に接続されるとともに、コンデンサ基板１２の下側には共通電極１０の支持片２２が配置され、電気的に接続されている。
【００３５】
そして、先の第１の線路導体６の先端部導体６ｃを先のコンデンサ基板１１の一側端部に形成されている電極部１１ａに電気的に接続し、先の第２の線路導体７の先端部導体７ｃを先のコンデンサ基板１１の他側端部に形成されている電極部１１ｂに電気的に接続し、先の第３の中心導体８の先端部導体８ｃをコンデンサ基板１２と終端抵抗１３に電気的に接続して磁性組立体１５にコンデンサ１１、１２と終端抵抗１３とが接続されている。なお、この終端抵抗１３を接続しなければ、サーキュレータとして作用する。
【００３６】
前記先端部導体７ｃの部分が接続されたコンデンサ基板１１の端部側にアイソレータ１としての第１ポートＰ１が形成され、先端部導体６ｃの部分が接続されたコンデンサ基板１１の端部側にアイソレータ１としての第２ポートＰ２が形成され、先端部導体８ｃの部分が接続された終端抵抗１３の端部側がアイソレータ（非可逆回路素子）１としての第３ポートＰ３とされている。
【００３７】
この形態のアイソレータ１において、アイソレータの特性と、小型化を両立させるために第１ポートＰ１と第２ポートＰ２に沿う方向に平行な方向のコンデンサ基板１１の長手をアイソレータ１全体の同方向の長手（換言すると、下ヨーク３の同方向の長さ）の６５％以上、１００％以下とすることが好ましい。この範囲の長さの中でも７５％以上、１００％以下であることがより好ましい。
次に第１ポートと第２ポートに沿う方向に直交する方向においては、コンデンサ基板１１の幅がアイソレータ１全体の同方向の長さの（換言すると下ヨーク３の同方向の長さの）１５％以上、４５％以下であることが好ましい。この範囲の幅の中でも３０％以上、４５％以下であることがより好ましい。
【００３８】
また、下ヨーク３と上ヨーク２との間の空間部において磁性組立体１５はその空間部の厚さの半分程を占有する厚さに形成されているので、磁性組立体１５よりも上ヨーク２側の空間部分には、図６にも示すスペーサ部材３０が収納され、該スペーサ部材３０に磁石部材４が設置されている。
先のスペーサ部材３０は、上ヨーク２の内部に収納可能な大きさの平面視矩形板状の基板部３１と、この基板部３１の底部側の４隅の各コーナ部分に形成された脚部３１ａとからなり、基板部３１において脚部（凸部）３１ａ…が形成されていない側の面（上面）に円型の収納凹部３１ｂが形成され、該収納凹部３１ｂの底面側には基板部３１を貫通する矩形型の透孔３１ｃが形成されている。
【００３９】
そして、先の収納凹部３１ｂに円盤状の永久磁石からなる磁石部材４が嵌め込まれ、この磁石部材４を備えた状態のスペーサ部材３０がそれらの４つの脚部（凸部）３０ａで先のコンデンサ基板１１、１２とこれらに接続されている第１の先端部導体６ｃ、７ｃ、並びに、終端抵抗１３とこれに接続されている先端部導体８ｃの先端部を下ヨーク３の底部側に押さえ付け、スペーサ部材３０により磁性組立体１５を下ヨーク３の底面側に押さえ付けた状態でヨーク２、３の間に収納されている。
なお、スペーサ部材３０の４つの脚部３１ａにより先のように先端部導体６ｃ、７ｃ、８ｃを押さえ付けることにより第１の線路導体６と第２の線路導体７と第３の線路導体８とに張力を付加した状態でこれらを磁性体基板５の表面側に押さえ付けていると同時に、スペーサ部材３０の透孔３１ｃを介して磁石部材４の底面により先の第１の線路導体６と第２の線路導体７と第３の線路導体８の重ねられた部分を押さえ付けることでこれらを磁性体基板５の表面側に押さえ付け、これらにより先の線路導体６、７、８を磁性体基板５の表面側に密に押し付けて密着させている。
なお、先の透孔３１ｃの大きさは先の磁性体基板５よりも若干小さい矩形状、換言すると、線路導体６、７、８が重ねられた領域を取り囲むことができる程度の大きさとされている。透孔３１ｃをこのような大きさとすることにより磁石部材４がその底面で線路導体６、７、８の重なり部分を全て磁性体基板５側に押さえ付けることができるとともに、スペーサ部材３０の基板部３１の底面により磁性体基板５を下ヨーク３の底面側に押し付けることができる。
【００４０】
図１〜図６に示す本実施の形態のアイソレータ１は、第１の線路導体６と第２の線路導体７がいずれも磁性体基板５の平面状の受面５ｄ、５ｄを介して折り曲げられ、第３の線路導体８が磁性体基板５の長辺５ａに沿って折り曲げられているので、各線路導体６、７、８における中心導体６ｂ、７ｂ、８ｂの折り曲げ部分が磁性体基板５の表面側において正確な角度、例えば第１の線路導体６と第２の線路導体７においては１２０゜の角度に折り畳まれる。即ち、平面状の受面５ｄの縁の直線部分を介しての折り畳み作業となるので、中心導体６ｂ、７ｂを磁性体基板５の表面側において正確に１２０゜の角度で交差させて折曲することが容易にできるようになる。従って、入力側の線路導体から磁性体基板５に入力された信号を出力側に効果的に伝搬させることができ、低損失でしかも広帯域な通過特性を発揮できる。従って磁性組立体１５の磁気特性として好適なものが確実に得られるようになる。
【００４１】
また、磁性体基板５の表面側に折り畳まれた中心導体６ｂ、７ｂ、８ｂは図１に示すように重ねられるが、この重ねた状態において、中心導体６ｂ、７ｂ、８ｂの各々において２本に分割されている分割導体６ｂ１、６ｂ２、７ｂ１、７ｂ２、８ｂ１、８ｂ２の各々が個々に重ねられる。しかし、これらの分割導体６ｂ１、６ｂ２、７ｂ１、７ｂ２、８ｂ１、８ｂ２の重ねられた部分においてはいずれかの２つの分割導体のみの重ね部とされ、３つの分割導体が重ねられてはいない。これは、２本の中心導体６、７を２分割した上に、中心導体８ｂを広げた状態の２分割構造として中心導体６ｂ、７ｂに対する重ね部分を避けることができるように重ねた構造としたためである。
【００４２】
このように重ねた構造にすることで３つの分割導体が重なることを避けることができ、これにより磁石部材４の底部で中心導体６ｂ、７ｂ、８ｂを磁性体基板５側に押し付ける際に中心導体６ｂ、７ｂ、８ｂの重なり部分を均一に押さえ付けることができる。ここで例えば、分割導体が３本重なる部分が生じると、分割導体が２本重なった部分よりも３本重なった部分の方が厚くなるので、この３本重なった部分には磁石部材４の強い押し付け力が作用する反面、他の２本重なった部分には磁石部材４の押し付け力が十分に作用しなくなるので、中心導体６ｂ、７ｂ、８ｂに均等に押さえ付け力を作用させてこれらの全てを均等に支持することができなくなるおそれが高くなる。
また、２つの分割導体が重ねられる部分のみが存在することにより、これを押さえ付けている磁石部材４を磁性体基板５に対して平行に配置することができ、この結果、磁石部材４によって磁性組立体１５に磁界を印加する場合に均一な磁界を作用させることができ、非可逆回路素子としての性能向上に寄与する。
【００４３】
更に、仮に３つの分割導体が重ねられた場合、磁性体基板５に最も近い側の分割導体と磁性体基板５から最も離れた側の分割導体の比較では、磁性体基板５から最も離れた側の分割導体が大きく膨らんだ状態で磁性体基板５の表面側に存在することとなるので、磁性体基板５の表面上に存在する分割導体の実効的な線路長の差異が大きくなる。これに対して分割導体どうしが２本重なる部分を形成するのみでは、重なり構造を採用する場合において最外層と最内層の分割導体の実効的な線路長の差異が最も小さくなる。このように２つの分割導体のみを重ねる構成を採用することで、分割導体の磁性体基板側の底面を概ね５０％以上、確実に磁性体基板５に密着させることができる。このように分割導体を磁性体基板５に密着させることにより、分割導体での信号の伝搬を安定に行うことができ、特性のばらつきを抑えることができる。
【００４４】
また、前述の如く中心導体８ｂの分割導体８ｂ１、８ｂ２を非平行もしくは平行でかつ折曲もしくは湾曲するように分割したことにより、入力側の線路導体から入力された信号を効果的に高周波フェライト製の磁性体基板５上を伝搬させ、出力することができ、広帯域な通過特性を発揮させることができる。
また、低周波化するためには各線路導体６、７、８を長くしてインダクタンスを大きくする必要があるが、本発明においては、第３の中心導体８ｂにおいて、第３の線路導体８が長さ方向中央部側において互いに離れる方向に折曲（屈曲）もしくは湾曲されてなるが、もしくは、互いに平行でかつ折曲もしくは湾曲されてなるが、これにより第３の線路導体８の長さが実質的に長くなって、インダクタンスが大きくなり、低周波化と小型化を両立することができる。
【００４５】
次に、本実施の形態では電極部１６の本体部１０Ａを磁性体基板５とほぼ同じ平面視形状としてあるが、このようにすることで本体部１０Ａがその下に位置する下ヨーク３に広い面積で接触できるので抵抗が低くなり、損失を小さくすることができる。
【００４６】
次に、先に説明したごとく第１の線路導体６と第２の線路導体７と第３の線路導体８の各々の付け根の部分には、凹部１８ａ、１９ａ、１０ｅが形成されており、各線路導体の線路長が若干長くされているので、各中心導体６、７、８のインダクタンスが大きくなり、共振容量の面積を小さくできる、換言するとコンデンサ基板１１、１２の面積を小さくできる効果があり、アイソレータ１としての全体の小型化に寄与する。
【００４７】
次に、磁石部材４はその底部で線路導体６、７、８の交差部分を磁性体基板５の上面側に押さえ付けてそれらを磁性体基板５の上面側に強く押さえ付ける。これにより、線路導体６、７、８の底面、換言すると、各分割導体６ｂ１、６ｂ２の底面（磁性体基板側の面）と分割導体７ｂ１、７ｂ２の底面（磁性体基板側の面）と分割導体８ｂ１、８ｂ２の底面（磁性体基板側の面）を全て密に磁性体基板５側に押し付けることができる。その結果、各線路導体６、７、８の底面側の平坦度を向上させることができ、特性の均一化に寄与する。
【００４８】
次に、本実施の形態の構造においては、共通電極１０の支持片２１にコンデンサ基板１１の下面が接続され、共通電極１０の支持片２２にコンデンサ基板１２の下面が接続されているので、本実施の形態の構造を簡略的に見ると図８Ａに示すように下ヨーク３上に共通電極１０の本体部１０Ａが設置され、共通電極１０の第１又は第２ポートＰ１、Ｐ２と支持片２１との間にコンデンサ基板１１を介在させた構造とみなすことができる。ここで下ヨーク３が接地されているとすると、コンデンサ基板１１は下ヨーク３にアースされる共通電極１０の本体部１０Ａと先の第１、第２ポートＰ１、Ｐ２との間に介在されることとなる。
これに対し、仮に図７Ｂに示す構造のように支持片２１が形成されていない場合、コンデンサ基板１１は下ヨーク３と第１、第２ポートＰ１、Ｐ２との間に設けられていることとなる。
図７Ａと図７Ｂに示す構造を比較すると、図７Ｂの構造ではコンデンサ基板１１のグランド側が下ヨーク３に接地されているので、信号経路の一部が高電気抵抗となるのに対し、図７Ａに示すようにコンデンサ基板１のアース側に共通電極１０の支持片２１が接続されていることで信号経路全体が低い電気特性となるので、非可逆回路素子としての損失を低減することができる。
【００４９】
図８Ａは、先の実施の形態のアイソレータ１が組み込まれる携帯電話装置の回路構成の一例を示すもので、この例の回路構成においては、アンテナ４０にアンテナ共振器４１が接続され、アンテ共振器４１の出力側にローノイズアンプ（増幅器）４２とフィルタ４８と選択回路４３を介して受信回路４４が接続され、アンテナ共振器４１の入力側に先の実施の形態のアイソレータ１とパワーアンプ（増幅器）４５と選択回路４６を介して送信回路４７が接続され、選択回路４３、４６に分配トランス４９が接続されて構成されている。
先の構成のアイソレータ１は図８Ａに示すような携帯電話装置の回路に組み込まれて使用され、アイソレータ１からアンテナ共振器４１側への信号は低損失で通過させるが、その逆方向の信号は損失を大きくして遮断するように作用する。これにより、増幅器４５側のノイズ等の不要な信号を増幅器４５側に逆入力させないという作用を奏する。
【００５０】
図８Ｂは図１から図６に示した構成のアイソレータ１の動作原理を示すものである。図８Ｂに示す回路に組み込まれているアイソレータ１は、符号▲１▼で示す第１ポートＰ１側から符号▲２▼で示す第２ポートＰ２方向への信号は伝えるが、符号▲２▼の第２ポートＰ２側から符号▲３▼の第３ポートＰ３側への信号は終端抵抗１３により減衰させて吸収し、終端抵抗１３側の符号▲３▼で示す第３ポートＰ３側から符号▲１▼で示す第１ポートＰ１側への信号は遮断する。
従って図８（Ａ）に示す回路に組み込んだ場合に先に説明した効果を奏することができる。
【００５１】
図９は、本発明に係る第２の実施の形態の非可逆回路素子に適用される電極部３５を示すもので、この形態の電極部３５において先の実施の形態の電極部１６と同じ構成要素には同一の符号を付してそれらの部分の説明を省略する。
この形態の電極部３５において先の実施の形態の電極部１６と異なるのは、第１の線路導体６と第２の線路導体７において共通電極１０の本体部１０Ａに対する付け根の部分の各々に前記第１の基部導体６ａと同じ程度の長さ（深さ）の凹部１０ｆを各々形成し、各線路導体６、７の線路長を更に長く形成した点に特徴がある。また、第３の線路導体８の付け根の部分にも先の凹部１０ｆと同等の長さ（深さ）の凹部１０ｇを形成することで第３の線路導体８の線路長も更に長くされている。
【００５２】
この図の実施の形態の如く、共通電極１０の本体部１０Ａに先の実施の形態よりも更に深い凹部１０ｆ、１０ｇを形成して線路導体６、７、８の実効の線路長を長くした構造を採用しても良い。この場合、凹部１０ｆ、１０ｇを形成した部分側まで絶縁層を配置し、各線路導体６、７、８を磁性体基板５の裏面側において個々に絶縁する構成とする必要がある。また、線路導体８は後述する実施の形態のごとく分割導体８ｂ１、８ｂ２を平行に、かつ、折曲もしくは湾曲して形成させても良い。
以上の構造を採用することで、中心導体６、７、８のインダクタンスが更に大きくなるので、共振容量の面積を小さくできる、換言するとコンデンサ基板１１、１２の面積を小さくできる効果があり、アイソレータ１としての全体の小型化に寄与する。
【００５３】
図は、本発明に係る第３の実施の形態の非可逆回路素子に適用される電極部３６を示すもので、この形態の電極部３６において先の第１の実施の形態の電極部１６と同じ構成要素には同一の符号を付してそれらの部分の説明を省略する。
この形態の電極部３６において先の実施の形態の電極部１６と異なるのは、第３の線路導体８０の中心導体８０ｂが分割導体８０ｂ１と８ｂ２に分割されている点であり、分割導体８０ｂ１は分割導体８ｂ２と非平行ではなく、分割導体８ｂ２に平行になるように屈曲されている。従って第３の中心導体８０ｂはＬ字型に形成されている。なお、第３の中心導体８０ｂは折曲（屈曲）された形状に記載されているが、湾曲された形状あるいは折り曲げ部分にアールが付けられた形状でも良いのは勿論である。更にこれらの分割導体はＬ字型に限らず、ジグザグ状、波形等に折曲された形状でも良いのは勿論である。
このような形状とした分割導体８０ｂ１、８ｂ２を備えた第３の線路導体８０を備えた構造であっても、線路導体８０ｂの実質的な導体長を長くして非可逆回路素子としての低周波化と小型化を両立させることができる。
【００５４】
図１１は本発明に係る非可逆回路素子（アイソレータ）の第４の実施の形態を示すもので、この形態のアイソレータ５０は、上ヨーク５１と下ヨーク５２とからなる閉磁気回路の内部に、換言すると、上ヨーク５１と下ヨーク５２の間に、４角板状の永久磁石からなる磁石部材５５とスペーサ部材５６と磁性組立体５７とコンデンサ板５８、５９、６０と終端抵抗６１とこれらを収容する樹脂ケース６２とを収容して構成されている。
前記磁性組立体５７は先の第１の実施の形態の電極部１６と同等の電極部１６が平面視略長方形状の磁性体基板６５に巻き付けられて構成されている。この磁性体基板６５は先の形態の横長の磁性体基板５とほぼ同じ形状であるが若干正方形状に近い長方形板状とされている。
図１１に示す構造のアイソレータ５０においても先の実施の形態のアイソレータ１と同等の効果を得ることができる。
【００５５】
図１２は磁性体基板の他の形態を示すもので、この形態の磁性体基板６０は平面視略長方形状で４つの角部にＬ字型の切欠状の受部６１を有する形状とされ、１つの受部６１を構成する２つ平面のうちの一方の平面が線路導体６を折り返すための受面６１ａとされ、他の１つの受部６１を構成する２つ平面のうちの一方の平面が線路導体７を折り返すための受面６１ｂとされ、これらの受面６１ａ、６１ｂにより電極部１６の第１の中心導体６ｂと第２の中心導体７ｂとが正確に折り返されるように構成されている。
この形態の磁性体基板６０においても平面視横長の略長方形状とされ、詳細には、相対向する長辺６０ａ、６０ａとそれらに直角方向に延在された短辺６０ｂ、６０ｂと先に説明した受部６１を構成する２つの辺とから平面視略長方形状の磁性体基板６０が構成されている。
この磁性体基板６０を用いることでも先の第１の実施の形態の場合と同様の効果を得ることができる。
【００５６】
図１３は磁性体基板の更に他の例を示すもので、この形態の磁性体基板７０は平面視略長方形状で４つの角部に平面状の受部７１を有し、短辺側が曲線とされた略レーストラック形状とされている。この形状も本発明においては略長方形状の概念に含めるものとする。より詳細には、磁性体基板７０は相対向する長辺７０ａ、７０ａとこれらの長辺７０ａ、７０ａの端部どうしを接続する楕円弧状の短辺７０ｂ、７０ｂとからなり、長辺７０ａ、７０ａの端部に形成された平面状の受部７１、７１と長辺７０ａにより先に説明した電極部１６の第１の中心導体６ｂと第２の中心導体７ｂと第３の中心導体８を正確に折り返しできるように構成されている。
この磁性体基板７０を用いることでも先の第１の実施の形態の場合と同様の効果を得ることができる。
【００５７】
【発明の効果】
以上説明したように本発明は、長方形のケース状のヨークの内部に、長方形状の磁性体基板と、該磁性体基板表面側の対角線に沿って配置される第１の線路導体と、該磁性体基板表面側の別の対角線に沿って配置される第２の線路導体と、該磁性体基板表面側の中央部に沿って配置される第３の線路導体と、前記磁性体基板の側方に配置される長方形状の複数のコンデンサ基板と、前記磁性体基板に対して磁界を印加するための磁石部材とが具備されてなり、前記第１の線路導体の先端に設けられた第１の線路導体の先端導体が、前記磁性体基板の一方の長辺側の一側端部において前記第１の線路導体の向きから方向を変えられて前記磁性体基板の短辺の延長線とヨーク内面に沿って設けられ、前記第２の線路導体の先端に設けられた第２の線路導体の先端導体が、前記磁性体基板の一方の長辺側の他側端部において前記第２の線路導体の向きから方向を変えられて前記磁性体基板の別の短辺の延長線とヨーク内面に沿って設けられ、前記複数の線路導体の各端部が前記コンデンサ基板に接続されてなり、前記磁性体基板の長辺に沿って前記磁性体基板の両側に前記コンデンサ基板が収納され、前記磁性体基板の短辺方向において、前記磁性体基板の幅が、前記ヨークの内幅よりも小さくなるように、磁性体基板の縦横比が２５％（１：４）以上、８０％（４：５）以下の範囲で形成され、前記磁性体基板の長辺方向において、磁性体基板の長さと前記ヨークの内幅がほぼ同じであるので、ヨーク内部の磁性体基板の周りの空間部にコンデンサ基板を収容することができる。
更に本発明は、前記磁性体基板の幅方向両側に配置された２つの前記コンデンサ基板のうち、一方の前記コンデンサ基板が前記複数の線路導体に接続された共通のコンデンサ基板とすることで必要とする容量を小さなコンデンサ占有面積で稼ぐことができる。
【００５８】
更に本発明は、線路導体の端部側を前記磁性体基板側から前記コンデンサ基板側にかけて巻き込み接続してなることで、線路導体を磁性体基板に対して押し付けることができるので、磁性体基板に対して複数の線路導体を密着させることができ、非可逆回路素子としての特性の安定化に寄与し、特性が良好で安定化された高品質の非可逆回路素子が得られる。
【００５９】
更に本発明において、分割導体どうしの重ねられた部分が平面視的に位置ずれされて配置される場合、磁性体基板の他面側において分割導体が平面視的に均等に収まり良く配置される。更に、第１の線路導体と第２の線路導体と第３の線路導体の分割導体どうしの重なり部分の全てが平面視的に位置ずれされていると、分割導体どうしが３本重ねられる部分が発生しないので、磁性体基板の他面側において分割導体の２本重なり部分と３本重なり部分の発生に起因する凹凸の発生が少なくなり、磁性体基板他面側における凹凸が少なくなる。
【００６０】
本発明において、線路導体の端部側が前記磁性体基板側から前記コンデンサ基板側にかけて巻き込み接続されてなることで、線路導体を磁性体基板に対して押し付けることができるので、磁性体基板に対して複数の線路導体を密着させることができ、非可逆回路素子としての特性の安定化に寄与し、特性が良好で安定化された高品質の非可逆回路素子が得られる。
【００６１】
線路導体を２本重ね部分のみとして、３本重ね部分を生じないようにすることにより、線路導体を重ねた部分に生じる山状の重なり部分の高さを低く均一化することができる。これにより、線路導体の重なり部分の全ての厚さを均一化できるので、磁石部材が線路導体を押さえる場合に全ての線路導体を均一に押さえ付けることができるようになり、磁性体基板に対する全ての線路導体の密着性を均一化することができ、非可逆回路素子としての特性安定化に寄与する。
【００６２】
本発明においてコンデンサ基板のうち、少なくとも１つを複数の線路導体に接続する共通のコンデンサ基板とすることで大きな容量を小さいなコンデンサ占有体積で稼ぐことができ、非可逆回路素子としての小型化に寄与する。
【図面の簡単な説明】
【図１】 図１Ａは本発明の第１の実施の形態に係るアイソレータの一部分を取り除いた状態を示す平面図、図１Ｂは同アイソレータの断面図である。
【図２】 図２は本発明に係るアイソレータに用いられる磁性体基板の一例を示す平面図。
【図３】 図３は本発明に係るアイソレータに用いられる電極部の展開図である。
【図４】 図４Ａは本発明に係るアイソレータの下ヨークを示す平面図、図４Ｂは同下ヨークの側面図である。
【図５】 図５は同アイソレータの上ヨークを示す側面図である。
【図６】 図６は同アイソレータに備えられるスペーサ部材の一例を示す斜視図である
【図７】 図７Ａは同アイソレータに備えられる共通電極とコンデンサ基板と磁性体基板との接続状態を示す略図、図７Ｂは図７Ａに示す構造の変形例を示す略図である。
【図８】 図８Ａはこの種のアイソレータが備えられる電気回路の一例を示す図、図８Ｂはアイソレータの動作原理を示す図である。
【図９】 図９は本発明に係るアイソレータの電極部の第２の例を示す図である。
【図１０】 図１０は本発明に係るアイソレータの電極部の第３の例を示す図である。
【図１１】 図１１は本発明に係るアイソレータの他の実施の形態を示す分解斜視図である。
【図１２】 図１２は本発明に係るアイソレータに適用される磁性体基板の他の例を示す平面図である。
【図１３】 図１３は本発明に係るアイソレータに適用される磁性体基板の別の例を示す平面図である。
【図１４】 図１４は従来の磁性組立体の一例を示す斜視図である。
【図１５】 図１５は従来の磁性組立体に適用されている電極部の展開図である。
【図１６】 図１６は従来のアイソレータの一例を示す分解斜視図である。
【符号の説明】
１…アイソレータ、２…上ヨーク、３…下ヨーク、４…磁石部材、５…磁性体基板、６…第１の線路導体、６ｂ…第１の中心導体、６ｂ１、６ｂ２…第１の分割導体、７…第２の線路導体、７ｂ…第２の中心導体、７ｂ１、７ｂ２…第２の分割導体、８…第３の線路導体、８ｂ…第３の中心導体、８ｂ１、８ｂ２…第３の分割導体、１１、１２…コンデンサ基板、１３…終端抵抗（抵抗素子）、１６…電極部、１８、１９…スリット部、２１、２２…支持片、３０…スペーサ部材、３１ａ…脚部（凸部）、３１ｂ…収納凹部、３１ｃ…透孔、４０…電極部、５０…アイソレータ、６０、７０…磁性体基板、Ｌ１、Ｌ２…対角線。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an irreversible circuit element such as an isolator or a circulator used in a high frequency band such as a microwave band.
[0002]
[Prior art]
A nonreciprocal circuit device used in this type of isolator includes a magnetic assembly 50 having a structure shown in FIG. 14, for example. The magnetic assembly 50 includes a magnetic substrate 55 made of ferrite having a rectangular plate shape, a common electrode 54 made of a metal plate provided along the lower surface thereof, and radially extending from the common electrode 54 in three directions. The first central conductor 51, the second central conductor 52, and the third central conductor 53 are formed and wound around the surface of the magnetic substrate 55.
The first central conductor 51, the second central conductor 52, and the third central conductor 53 are bent with respect to each other along the corner of the magnetic substrate 55, and intersect each other at an angle of approximately 120 ° on the surface side of the magnetic substrate 55. So they are stacked. Although not shown in the drawings, the central conductors 51, 52, and 53 are individually insulated on the surface side of the magnetic substrate 55 by an insulating sheet.
[0003]
The tip portions of the three central conductors 51, 52, 53 are arranged so as to protrude to the side of the magnetic substrate 55, and are defined as port portions P1, P2, P3. Then, a matching capacitor (not shown) is connected to each of the port portions P1 to P3, and a termination resistor is connected to one of the port portions via a previous capacitor, and these are combined with a permanent magnet to form a magnetic circuit. The isolator is configured by applying a DC magnetic field with a permanent magnet housed in the yoke and separately arranged on the magnetic assembly 50.
Each of the above-described center conductors 51 to 53 is connected and integrated in a common electrode 54 serving as a ground portion as shown in the developed view of FIG. 15, and is projected from the common electrode 54 in three directions. 51 to 53 are configured to be bent at the position of the bent portion X in FIG. 15 so that the magnetic substrate 55 can be accurately assembled to the magnetic substrate 55 at a predetermined angle.
[0004]
FIG. 16 shows an example of the structure of a general isolator provided with the above-described type of magnetic assembly. The isolator 60 shown in FIG. 16 has a magnet member 63, a spacer member 64, a magnetic assembly 65, capacitor boards 66, 67 and 68, a terminal resistor 69, and a board 70 interposed between a lower case 61 and an upper case 62. Configured. Similar to the magnetic assembly 50 of the previous example, the magnetic assembly 65 of this example includes a magnetic substrate 72 and center conductors 73, 74, and 75 arranged so as to surround the magnetic substrate 72. 75 are individually divided into two by slits. In this example, the magnetic substrate 72 is a disk type, but the magnetic substrate may be a disk type as in this example or a rectangular plate as in the previous example.
On the substrate 70, thin plate-like capacitor substrates 66, 67, 68 are arranged in a U-shape, and a magnetic assembly 65 is arranged inside the capacitor substrates 66, 67, 68. Capacitor substrate in which 65 end portions 73a, 74a, 75a of the central conductors 73, 74, 75 are extended to the side of the magnetic substrate 72, and the end portions 73a, 74a, 75a are positioned below them. 66, 67 and 68 are soldered and joined. In addition, a plate-like spacer member 64 having convex portions 64 a and 64 a is disposed on the upper side, and a magnet member 63 is disposed on the spacer member 64.
[0005]
[Problems to be solved by the invention]
In the conventional isolator 60, the magnetic assembly 65 is assembled and then disposed at the center of the substrate 70, and the end portions 73a, 74a, and 75a protruding laterally from the magnetic assembly 65 are used as spacer members. 64 is pressed onto the capacitor substrate by the convex portions 64a, and the entire ends are immersed in molten solder by a reflow method for soldering in a state of being pressed by the spacer member 64, and the ends 73a, 74a, 75a and the capacitor The spacer member 64 is made of a heat resistant resin such as a liquid crystal polymer that can withstand a temperature of about 260 ° C. for several seconds because of the soldering of the substrates 67, 66, and 68.
[0006]
By the way, in the isolator 60 shown in FIG. 16, since the three central conductors 73, 74, and 75 are overlapped at the central portion on the upper surface side of the magnetic substrate 72 in the magnetic assembly 65, The central conductors 73, 74, and 75 are overlapped with the central portion on the upper surface side, and a portion that rises in a mountain shape is generated. These central conductors 73, 74, and 75 are made of a metal thin plate punching material and have a certain thickness. However, the portion where the three central conductors 73, 74, and 75 are stacked is a magnetic material that is raised in a mountain shape. The central conductors 73, 74, and 75 are formed on the substrate 72 and are simply wound lightly without being in close contact with the upper surface of the magnetic substrate 72.
[0007]
However, the close contact state of the central conductors 73, 74, and 75 with respect to the magnetic substrate 72 is related to an increase in loss as an isolator. For example, in the portion where the three central conductors 73, 74, and 75 are stacked in a mountain shape. There is a problem that the line length of the center conductor farthest from the magnetic substrate 72 is relatively long with respect to the center conductor closest to the magnetic substrate 72. If the actual line lengths are different, there is a problem that loss increases and it is difficult to achieve the performance as designed as an isolator. In addition, there is a problem that it is difficult to ensure the flatness of the bottom surface side of the central conductor in the portion where the central conductors 73, 74, and 75 are overlapped.
Further, the fact that the mountain-shaped overlapping portions due to the central conductors 73 to 75 are present on the magnetic substrate 72 means that it is difficult to increase the parallelism of the spacer member 64 and the magnet member 63 that are superimposed on them. This also means that when a magnetic field is applied to the magnetic substrate 72 by the magnet member 63, a uniform magnetic field may not be applied.
In addition, this type of isolator has come to be formed in a size of about 4 to 5 mm square as a whole with the recent miniaturization of high-frequency circuits. Producing 73-75 mountain-shaped overlapping portions may adversely affect the promotion of thinning of the isolator as a whole.
[0008]
The present invention has been made on the basis of the above background, and a magnetic assembly can be obtained by tightly winding a line conductor or a central conductor around a magnetic substrate, and thus a nonreciprocal circuit element and an isolator having good characteristics. Is one of the purposes.
The present invention secures the balance between the magnetic member and the magnetic substrate disposed via the spacer member by minimizing the mountain-shaped overlapping portion of the line conductors arranged around the magnetic substrate, and thus has the characteristics. An object is to provide a good non-reciprocal circuit device and an isolator.
[0009]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention provides a rectangular magnetic substrate inside a rectangular case-shaped yoke, and the magnetic substrate.A first line conductor disposed along a diagonal on the surface side, a second line conductor disposed along another diagonal on the surface of the magnetic substrate, and a central portion on the surface side of the magnetic substrate. AlongBe placedThirdA line conductor, a plurality of rectangular capacitor substrates disposed on the sides of the magnetic substrate, and a magnet member for applying a magnetic field to the magnetic substrate;The tip conductor of the first line conductor provided at the tip of the first line conductor changes direction from the direction of the first line conductor at one side end of one long side of the magnetic substrate. And provided along the extension of the short side of the magnetic substrate and the inner surface of the yoke, and the tip conductor of the second line conductor provided at the tip of the second line conductor is connected to one of the magnetic substrates. The direction of the second line conductor is changed from the direction of the second line conductor at the other side end of the long side, and provided along the extension of the other short side of the magnetic substrate and the yoke inner surface,Each end of the plurality of line conductors is connected to the capacitor substrate, and the magnetic substrateAlong the long side of the magnetic substrateThe capacitor substrate is housed on both sides of the magnetic substrate.In the short side direction, the magnetic substrateThe width is smaller than the inner width of the yokeThus, the aspect ratio of the magnetic substrate is in the range of 25% (1: 4) to 80% (4: 5).Formed,In the long side direction of the magnetic substrate, the length of the magnetic substrate and the inner width of the yoke are substantially the same.It is characterized by that.
[0010]
  A rectangular magnetic substrate having a width smaller than that of the yoke is provided inside the rectangular case-shaped yoke, and a rectangular capacitor substrate is accommodated on both sides in the width direction. A capacitor substrate can be accommodated in the surrounding space.
[0011]
  In order to solve the above-described problem, the present invention provides a common capacitor substrate in which one of the two capacitor substrates arranged on both sides of the magnetic substrate in the width direction is connected to the plurality of line conductors. AndThe tip conductor of the first line conductor is connected to one end of the both ends of the capacitor substrate, and the tip conductor of the second line conductor is connected to the other end.It is characterized by that.
[0012]
  By using a common capacitor substrate, the required capacity can be obtained with a small capacitor occupation area.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in further detail below.
1 to 6 show a first embodiment of an isolator which is an example of a nonreciprocal circuit device according to the present invention. The isolator 1 of this embodiment is formed in a case shape from an upper yoke 2 and a lower yoke 3. A magnet member 4 made of a permanent magnet, a magnetic substrate 5 made of a ferromagnetic material, line conductors 6, 7, 8, and these line conductors 6, 7, 8 are connected in a configured yoke (closed magnetic circuit). Capacitor substrates 11 and 12 and a terminating resistor (resistive element) 13 disposed around the common electrode 10 and the magnetic substrate 5 are configured.
[0021]
The upper yoke 2 and the lower yoke 3 are made of a ferromagnetic material such as soft iron, and are formed in a rectangular case shape as shown in FIGS. In addition, it is preferable that conductive layers such as Ag plating are formed on the front and back surfaces of the yokes. The upper yoke 2 having a substantially U shape in side view is sized so as to be fitted into the lower yoke 3 in a substantially U shape in side view. By fitting the opening portions of the upper yoke 2 and the lower yoke 3 together. Both are integrated so that a case-like yoke (magnetic closed circuit) can be formed.
That is, as shown in FIG. 4, the lower yoke 3 is formed in a U-shaped side surface composed of a bottom plate 3a having a rectangular shape in plan view and side wall portions 3b erected on two opposite sides of the bottom plate 3a. As shown in FIG. 5, the upper yoke 2 has a U-shaped side surface composed of a planar rectangular top plate 2a and side wall portions 2b erected on two opposite sides of the top plate 2a. The case-like magnetic closed circuit is configured by forming the side walls 2b, 2b of the upper yoke 2 and the side walls 3b, 3b of the lower yoke 3 alternately and fitting the yokes 2, 3 together. Is formed. The shapes of the yokes 2 and 3 are not limited to the U-shape as in this embodiment, and any shape may be used as long as a case-like closed magnetic circuit is constituted by a plurality of yokes.
[0022]
In the space surrounded by the lower yoke 2 and the upper yoke 3 fitted as described above, in other words, in the closed magnetic circuit composed of the lower yoke 2 and the upper yoke 3, the previous magnetic substrate 5 and the three line conductors 6 are provided. , 7 and 8 and a magnetic assembly 15 composed of the common electrode 10 connecting these line moving bodies 6, 7 and 8 is housed.
The magnetic substrate 5 is made of a ferromagnetic material such as ferrite and has a substantially rectangular plate shape that is horizontally long in a plan view as shown in FIG. More specifically, the magnetic substrate 5 includes two horizontally long long sides 5a and 5a facing each other, short sides 5b and 5b perpendicular to the long sides 5a and 5a, and both ends of the long sides 5a and 5a. It is located at the part side and is inclined at an angle of 150 ° with respect to each long side 5a (inclined at an inclination angle of 30 ° with respect to the extended line of the long side 5a) and individually connected to the previous short side 5b It is made into the substantially rectangular shape of the horizontal view planar view comprised from the four inclined sides 5c which do. Accordingly, inclined surfaces (receiving surfaces) 5d each having a 150 ° inclination with respect to the long side 5a (an inclination of 130 ° with respect to the short side 5b) are formed at the four corner portions in plan view of the magnetic substrate 5.
[0023]
In the magnetic substrate 5, the ratio of the width in the lateral direction, that is, the longitudinal direction, to the width in the longitudinal direction, that is, the direction orthogonal to the longitudinal direction, that is, the aspect ratio is 25% (1: 4) or more. , 80% (4: 5) or less, that is, horizontally long in plan view.
Here, FIG. 1 shows a magnetic substrate 5 that is horizontally long in a plan view, but when viewed from the horizontal direction obtained by rotating FIG. 1 by 90 °, the magnetic substrate 5 has a vertically long shape. Therefore, in the present invention, the magnetic substrate 5 is considered to be completely equivalent to either a horizontally long shape or a vertically long shape.
[0024]
The three line conductors 6, 7, 8 and the common electrode 10 are integrated as shown in the developed view of FIG. 3, and the three line conductors 6, 7, 8 and the common electrode 10 are mainly used. An electrode portion 16 is configured. The common electrode 10 is composed of a main body portion 10A made of a metal plate having a shape substantially similar to the magnetic substrate 5 in plan view. That is, the main body portion 10A has two long side portions 10a and 10a opposite to each other, short side portions 10b and 10b perpendicular to the long side portions 10a and 10a, and both end sides of the long side portions 10a and 10a. A plan view composed of four inclined portions 10c, which are located at an angle of 150 ° with respect to each long side portion 10a and connected with an inclination angle of 130 ° with respect to the short side portion 10b. It is substantially rectangular (rectangular shape).
[0025]
The first line conductor 6 and the second line conductor 7 are formed so as to extend from the two inclined portions 10c on one long side portion of the inclined portions 10c of the four corner portions of the common electrode 10. ing. First, while the first line conductor 6 including the first base conductor 6a, the first center conductor 6b, and the first tip conductor 6c is extended from one of the two inclined portions 10c, A second line conductor 7 composed of a second base conductor 7a, a second center conductor 7b, and a second tip conductor 7c is extended and formed from the other side of the inclined portion 10c. The base conductors 6a and 7a are formed to have the same width as the inclined portion 10c so as to extend the inclined portion 10c, and the base conductors 6a and 7a have their central axes aligned with the long side portion 10a of the common electrode 10. Are inclined at an inclination angle of 150 °. Next, the central conductors 6b and 7b are both parallel to the short side portion 10b of the common electrode 10, in other words, at an inclination angle of 150 ° with respect to the central axis (length direction) of the base conductors 6a and 7a. Further, the tip end conductors 6 c and 7 c are inclined at 150 ° with respect to the long side portion 10 a of the common electrode 10.
Therefore, the angle θ1 formed between the central axes of the connecting conductors 6a and 7a is 60 ° as shown in FIG. 3, and the angle θ2 formed between the central axes of the tip end conductors 6c and 6c is shown in FIG. As shown, the angle is 120 °.
[0026]
Next, at the center in the width direction of the first line conductor 6, there is a slit 18 that passes from the outer periphery of the common electrode 10 through the base conductor 6a and the center conductor 6b and reaches the base end of the tip end conductor 6c. By forming the slit portion 18, the central conductor 6b is divided into two divided conductors 6b1 and 6b2, and the base conductor 6a is also divided into two divided conductors 6a1 and 6a2, and the second line A similar slit portion 19 is also formed in the widthwise central portion of the conductor 7, and by forming this slit portion 19, the central conductor 7b is divided into two divided conductors 7b1 and 7b2, and two base conductors 7a are also provided. Divided conductors 7a1 and 7a2.
The end of the slit portion 18 on the common electrode 10 side passes through the connection conductor 6a and reaches a slightly deeper position from the outer periphery of the common electrode 10 to form a recess 18a, and the line length of the first line conductor 6 The end of the slit portion 19 on the common electrode 10 side also passes through the connecting conductor 7a to reach the outer peripheral portion of the common electrode 10 to form a recess 19a, whereby the second line conductor 7 is slightly longer.
[0027]
On the other hand, a third line conductor 8 is extended in the central portion of the common electrode 10 on the other long side portion 10a side. The third line conductor 8 is composed of a third base conductor 8a, a third center conductor 8b, and a third tip conductor 8c that are formed so as to protrude from the common electrode 10. The third base conductor 8a is composed of two strip-shaped divided conductors 8a1 and 8a2 extending substantially perpendicularly from the central part on the long side of the common electrode 10, and the two divided conductors 8a1 and 8a2 are formed. A slit 20 is formed between them. The third center conductor 8b includes a planar conductor L-shaped divided conductor 8b1 connected to the previous divided conductor 8a1 and a planar-view L-shaped divided conductor 8b2 connected to the previous divided conductor 8a2. 8b1 and the divided conductor 8b2 are extended from the divided conductors 8a1 and 8a2 so as to be spaced apart from each other in order to increase the substantial conductor length of the divided conductors 8a1 and 8a2, and the divided conductors 8b1 and 8b2 are separated from each other. A rhombus center conductor 8b is formed from the above.
[0028]
Further, the tip ends of these divided conductors 8b1 and 8b2 are integrated with an L-shaped third tip conductor 8c. The third tip conductor 8c is connected to the connecting portion 8c1 formed by extending the divided conductors 8b1 and 8b2 in the same direction as the previous divided conductors 8a1 and 8a2 and the connecting portion 8c1. The connecting portion 8c2 is formed to extend in a substantially perpendicular direction.
[0029]
Next, on the side of one long side portion 10a of the common electrode 10, the long side portion 10a of the common electrode 10 is partially cut away at both side portions of the split conductors 8a1 and 8a2 of the third line conductor 8. Three recesses 10e are formed, and the line length of the third line conductor 8 is slightly increased by forming these recesses 10e. Further, in the one long side portion 10a of the common electrode 10, the divided conductors 8a1, the above-mentioned divided conductors 8a1, are provided outside the two concave portions 10e on both sides of the three concave portions 10e, in other words, between the concave portion 10e and the inclined portion 10c. A trapezoidal support piece 21 is formed to extend in a direction parallel to 8a2, and a rectangular support piece 22 is formed to extend in the center of the common electrode 10 on the other long side 10a side. Yes. These support pieces 21 and 22 are ground electrodes of the capacitor substrates 11 and 12, and are electrically connected to one surface of the capacitor substrates 11 and 12, and further on the other surface side, as will be described later, the tip end conductors 6c and 7c. , 8c.
[0030]
The common electrode 10 configured as described above has the main body portion 10A attached to the back surface side (one surface side) of the magnetic substrate 5, and the first line conductor 6, the second line conductor 7, and the third line conductor. 8 is bent to the front surface side (the other surface side) of the magnetic substrate 5 and attached to the magnetic substrate 5, and constitutes a magnetic assembly 15 together with the magnetic substrate 5. That is, the divided conductors 6 a 1 and 6 a 2 of the first line conductor 6 are bent along the edge of one inclined surface 5 d of the magnetic substrate 5, and the divided conductors 7 a 1 and 7 a 2 of the second line conductor 7 are bent on the magnetic substrate 5. Bend along the edge of the other inclined surface 5d, fold the divided conductors 8a1 and 8a2 of the third line conductor 8 along the edge of the long side 5a of the magnetic substrate 5, and center the first line conductor 6 The conductor 6a is attached to the surface side (other surface side) of the magnetic substrate 5 along a diagonal line on the magnetic substrate surface side, and the central conductor 7b of the second line conductor 7 is connected to the surface side (other surface) of the magnetic substrate 5 ) Along the diagonal of the surface of the magnetic substrate, and the central conductor 8b of the third line conductor 8 along the central portion of the surface portion of the magnetic substrate 5, thereby making the common electrode 10 magnetic. The magnetic assembly 15 is mounted on the substrate 5.
[0031]
In addition, the diagonal line described here is a substantially rectangular shape when the extension line of each long side 5a and each short side 5b intersects when the magnetic substrate 5 is viewed in plan as shown in FIG. Assuming that the vertex of the magnetic substrate 5 is present, a line segment connecting the opposing vertices among these four vertices is defined as diagonal lines L1 and L2.
Further, the conductor portions 8b1 and 8b2 are arranged on the surface side of the magnetic substrate 5, and the length of the divided conductor 8b1 or the divided conductor 8b2 attached to the surface side of the magnetic substrate 5 is as shown in FIG. It is preferable to be 105% or more of the vertical width of the substrate 5 (the width along the width direction of the horizontally long rectangular magnetic substrate 5). By doing so, it is possible to increase the substantial conductor length of the divided conductors 8b1 and 8b2 to achieve both low frequency and small size as the nonreciprocal circuit element.
[0032]
By attaching the first to third line conductors 6, 7, 8 to the surface side of the magnetic substrate 5 as described above, the first line conductor 6 and the second line conductor 7 as shown in FIG. 1A. Are arranged so as to overlap each other along the diagonal lines L1 and L2 of the magnetic substrate 5, and the first center conductor 6b and the second center conductor 7b are inclined on the surface of the magnetic substrate 5 at an inclination angle of 120 ° in plan view. Crossed and overlapped. Further, in the overlapping state of the first to third center conductors 6b, 7b, 8b, the divided conductors 6b1, 6b2 of the first center conductor 6b and the divided conductors 7b1, 7b2 of the second center conductor 7b are overlapped. The portions where the divided conductors 6b1 and 6b2 and the divided conductors 7b1 and 7b2 are overlapped are arranged on the surface of the magnetic substrate 5 on the surface side of the magnetic substrate 5. Arranged so as not to overlap.
[0033]
Further, the divided conductors 8b1 and 8b2 of the third central conductor 8b are arranged so as to avoid the portions where the divided conductors 6b1 and 6b2 and the divided conductors 7b1 and 7b2 are overlapped. Therefore, on the surface of the magnetic substrate 5, the divided conductors 6b1 and 6b2, the divided conductors 7b1 and 7b2, and the divided conductors 8b1 and 8b2 are arranged in a combination of two of these combinations. Are arranged so as not to be overlapped.
Although omitted in FIG. 1A, the magnetic substrate 5, the first line conductor 6, the second line conductor 7, and the third line conductor 8 are respectively shown in FIG. 1B. As shown in a simplified manner, the line conductors 6, 7, 8 are individually electrically insulated with an insulating sheet Z interposed therebetween.
[0034]
Next, the magnetic assembly 15 is arranged on the center side of the bottom of the lower yoke 3, and both side portions of the magnetic assembly 15 on the bottom side of the lower yoke 3 are elongated in plan view and are about half of the previous magnetic substrate 5. Thick plate-like capacitor substrates 11 and 12 are accommodated, and a terminating resistor 13 is accommodated on one side of the capacitor substrate 12. More specifically, the length of the magnetic substrate 5 of the previous magnetic assembly 15 is formed to be substantially the same as the inner width of the lower yoke 3, and the width of the magnetic substrate 5 (the width in the direction perpendicular to the longitudinal direction) is set. Since the magnetic substrate 5 is formed smaller than the inner width of the lower yoke 3, the width of the magnetic substrate 5 in the state where the magnetic substrate 5 is housed in the lower yoke 3 so as to be horizontally long as shown in FIG. As shown in FIG. 1, spaces are formed on both sides in the direction so that the capacitor substrates 11 and 12 can be accommodated, and thin plate type capacitor substrates 11 and 12 and a chip-like termination resistor (resistive element) 13 are formed in these spaces. It is stored.
Furthermore, support pieces 21 and 21 of the common electrode 10 are disposed on the lower side of the capacitor substrate 11 and are electrically connected, and a support piece 22 of the common electrode 10 is disposed on the lower side of the capacitor substrate 12. Electrically connected.
[0035]
Then, the tip end conductor 6c of the previous first line conductor 6 is electrically connected to the electrode portion 11a formed at one end of the previous capacitor substrate 11, and the second line conductor 7 of the previous second line conductor 7 is electrically connected. The tip end conductor 7c is electrically connected to the electrode portion 11b formed at the other end of the previous capacitor substrate 11, and the tip end conductor 8c of the third center conductor 8 is connected to the capacitor substrate 12 and the terminating resistor. The capacitors 11 and 12 and the terminating resistor 13 are connected to the magnetic assembly 15 in an electrically connected manner. If this terminal resistor 13 is not connected, it acts as a circulator.
[0036]
A first port P1 as an isolator 1 is formed on the end side of the capacitor substrate 11 to which the tip conductor 7c portion is connected, and the isolator is on the end side of the capacitor substrate 11 to which the tip conductor 6c portion is connected. 2 is formed, and the end side of the terminating resistor 13 to which the tip conductor 8c is connected is a third port P3 as an isolator (non-reciprocal circuit element) 1.
[0037]
In the isolator 1 of this embodiment, in order to achieve both the characteristics of the isolator and miniaturization, the length of the capacitor substrate 11 in the direction parallel to the direction along the first port P1 and the second port P2 is the same length in the same direction of the isolator 1 as a whole. (In other words, the length is preferably 65% or more and 100% or less of the length of the lower yoke 3 in the same direction). Among the lengths in this range, it is more preferably 75% or more and 100% or less.
Next, in a direction orthogonal to the direction along the first port and the second port, the width of the capacitor substrate 11 is the length of the isolator 1 in the same direction (in other words, the length of the lower yoke 3 in the same direction). % Or more and 45% or less is preferable. Within this range, it is more preferably 30% or more and 45% or less.
[0038]
Further, since the magnetic assembly 15 is formed in the space between the lower yoke 3 and the upper yoke 2 so as to occupy about half of the thickness of the space, the upper yoke is higher than the magnetic assembly 15. A spacer member 30 also shown in FIG. 6 is accommodated in the space portion on the second side, and the magnet member 4 is installed on the spacer member 30.
The previous spacer member 30 includes a rectangular plate-like substrate portion 31 having a size that can be accommodated in the upper yoke 2 and leg portions formed at the corners at the four corners on the bottom side of the substrate portion 31. A circular storage recess 31b is formed on the surface (upper surface) of the substrate portion 31 where the leg portions (projections) 31a... Are not formed, and the substrate portion is formed on the bottom surface side of the storage recess 31b. A rectangular through hole 31 c that penetrates 31 is formed.
[0039]
And the magnet member 4 which consists of a disk-shaped permanent magnet is engage | inserted by the previous accommodation recessed part 31b, and the spacer member 30 of the state provided with this magnet member 4 is the capacitor | condenser of the tip by those four leg parts (convex part) 30a. The substrates 11, 12 and the first tip conductors 6c, 7c connected to them, and the terminal resistor 13 and the tip of the tip conductor 8c connected thereto are pressed against the bottom side of the lower yoke 3. The magnetic assembly 15 is housed between the yokes 2 and 3 while being pressed against the bottom surface of the lower yoke 3 by the spacer member 30.
In addition, the first line conductor 6, the second line conductor 7, and the third line conductor 8 are pressed by pressing the tip end conductors 6c, 7c, and 8c as described above by the four legs 31a of the spacer member 30. These are pressed against the surface side of the magnetic substrate 5 in a state where tension is applied to the magnetic material substrate 5 and at the same time, the first line conductor 6 and the first line conductor 6 are connected to each other by the bottom surface of the magnet member 4 through the through holes 31c of the spacer member 30. By pressing the overlapping portions of the second line conductor 7 and the third line conductor 8, they are pressed against the surface of the magnetic substrate 5, and the previous line conductors 6, 7, 8 are thereby pressed to the magnetic substrate 5 is closely pressed against the surface side.
Note that the size of the previous through hole 31c is a rectangular shape slightly smaller than the previous magnetic substrate 5, in other words, a size that can surround the region where the line conductors 6, 7, and 8 are overlapped. Yes. By setting the through hole 31c to such a size, the magnet member 4 can press all the overlapping portions of the line conductors 6, 7, 8 on the bottom surface thereof against the magnetic substrate 5 side, and also the substrate portion of the spacer member 30. The magnetic substrate 5 can be pressed against the bottom surface side of the lower yoke 3 by the bottom surface 31.
[0040]
In the isolator 1 of the present embodiment shown in FIGS. 1 to 6, the first line conductor 6 and the second line conductor 7 are both bent through the planar receiving surfaces 5 d and 5 d of the magnetic substrate 5. Since the third line conductor 8 is bent along the long side 5 a of the magnetic substrate 5, the bent portions of the center conductors 6 b, 7 b, 8 b in the line conductors 6, 7, 8 are formed on the magnetic substrate 5. It is folded at an accurate angle on the front side, for example, an angle of 120 ° in the first line conductor 6 and the second line conductor 7. That is, since the folding work is performed through the straight line portion of the edge of the planar receiving surface 5d, the central conductors 6b and 7b are bent at an angle of exactly 120 ° on the surface side of the magnetic substrate 5. Can be easily done. Therefore, a signal input to the magnetic substrate 5 from the line conductor on the input side can be effectively propagated to the output side, and low-loss and wide band pass characteristics can be exhibited. Therefore, a suitable magnetic characteristic of the magnetic assembly 15 can be obtained with certainty.
[0041]
Further, the central conductors 6b, 7b, 8b folded on the front surface side of the magnetic substrate 5 are overlapped as shown in FIG. 1, and in this overlapped state, the center conductors 6b, 7b, 8b are divided into two. Each of the divided conductors 6b1, 6b2, 7b1, 7b2, 8b1, and 8b2 is overlaid individually. However, in the overlapped portion of these divided conductors 6b1, 6b2, 7b1, 7b2, 8b1, and 8b2, only two divided conductors are overlapped, and the three divided conductors are not overlapped. This is because the two central conductors 6 and 7 are divided into two parts, and the center conductor 8b is expanded so that a two-part structure is formed so as to avoid overlapping with the central conductors 6b and 7b. It is.
[0042]
By making the stacked structure in this way, it is possible to avoid the overlapping of the three divided conductors, so that when the central conductors 6b, 7b, 8b are pressed against the magnetic substrate 5 at the bottom of the magnet member 4, the central conductors are prevented. The overlapping part of 6b, 7b, 8b can be pressed down uniformly. Here, for example, when a portion where three divided conductors overlap is generated, a portion where three overlapping conductors overlap is thicker than a portion where two split conductors overlap. Therefore, the magnet member 4 is stronger in the three overlapping portions. While the pressing force is applied, the pressing force of the magnet member 4 is not sufficiently applied to the other two overlapping portions. Therefore, the pressing force is applied evenly to the central conductors 6b, 7b, 8b, and all of these are applied. There is a high possibility that it will not be possible to support evenly.
Further, since there is only a portion where the two divided conductors are overlapped, the magnet member 4 holding the two divided conductors can be arranged in parallel to the magnetic substrate 5. When a magnetic field is applied to the assembly 15, a uniform magnetic field can be applied, which contributes to improved performance as a non-reciprocal circuit element.
[0043]
Further, if three divided conductors are overlapped, the side of the side farthest from the magnetic substrate 5 is compared in the comparison of the side of the split conductor closest to the magnetic substrate 5 and the segmented conductor farthest from the magnetic substrate 5. Therefore, the difference between the effective line lengths of the divided conductors existing on the surface of the magnetic substrate 5 is increased. On the other hand, if only two overlapping portions are formed, the difference in effective line length between the outermost layer and the innermost layered conductor is minimized when the overlapping structure is adopted. By adopting a configuration in which only two divided conductors are overlapped in this way, the bottom surface of the divided conductor on the magnetic substrate side can be surely adhered to the magnetic substrate 5 with approximately 50% or more. By bringing the divided conductor into close contact with the magnetic substrate 5 in this way, signal propagation through the divided conductor can be performed stably, and variations in characteristics can be suppressed.
[0044]
Further, as described above, the divided conductors 8b1 and 8b2 of the central conductor 8b are divided so as to be non-parallel or parallel and bent or curved, so that signals input from the line conductor on the input side can be effectively made of high-frequency ferrite. It is possible to propagate and output on the magnetic substrate 5 and to exhibit a broadband pass characteristic.
Further, in order to lower the frequency, it is necessary to lengthen the line conductors 6, 7, and 8 to increase the inductance. However, in the present invention, the third line conductor 8 is formed in the third central conductor 8b. It is bent (bent) or curved in the direction away from each other at the central portion in the length direction, or is parallel to each other and bent or curved, so that the length of the third line conductor 8 is reduced. Substantially longer, the inductance increases, and both low frequency and small size can be achieved.
[0045]
Next, in the present embodiment, the main body portion 10A of the electrode portion 16 has substantially the same planar shape as the magnetic substrate 5, but by doing so, the main body portion 10A is wide on the lower yoke 3 positioned below the main body portion 10A. Since the contact can be made in the area, the resistance is lowered and the loss can be reduced.
[0046]
Next, as described above, recesses 18a, 19a, and 10e are formed at the bases of the first line conductor 6, the second line conductor 7, and the third line conductor 8, respectively. Since the line length of the line conductor is slightly increased, the inductance of each of the central conductors 6, 7, and 8 is increased, and the area of the resonance capacitance can be reduced. In other words, the area of the capacitor substrates 11 and 12 can be reduced. This contributes to the overall miniaturization of the isolator 1.
[0047]
Next, at the bottom of the magnet member 4, the intersection of the line conductors 6, 7, 8 is pressed against the upper surface side of the magnetic substrate 5 and pressed firmly against the upper surface side of the magnetic substrate 5. As a result, the bottom surfaces of the line conductors 6, 7, and 8, in other words, the bottom surfaces (surfaces on the magnetic substrate side) of the divided conductors 6b1 and 6b2, and the bottom surfaces (surfaces on the magnetic substrate side) of the divided conductors 7b1 and 7b2 are divided. The bottom surfaces (surfaces on the magnetic substrate side) of the conductors 8b1 and 8b2 can all be pressed tightly against the magnetic substrate 5 side. As a result, the flatness on the bottom surface side of each line conductor 6, 7, 8 can be improved, which contributes to uniform characteristics.
[0048]
Next, in the structure of the present embodiment, the lower surface of the capacitor substrate 11 is connected to the support piece 21 of the common electrode 10, and the lower surface of the capacitor substrate 12 is connected to the support piece 22 of the common electrode 10. When the structure of the embodiment is briefly seen, as shown in FIG. 8A, the main body portion 10A of the common electrode 10 is installed on the lower yoke 3, and the first or second port P1, P2 of the common electrode 10 and the support piece 21 are provided. It can be considered that the capacitor substrate 11 is interposed between the two. Assuming that the lower yoke 3 is grounded, the capacitor substrate 11 is interposed between the main body portion 10A of the common electrode 10 grounded to the lower yoke 3 and the first and second ports P1 and P2. It will be.
On the other hand, if the support piece 21 is not formed as in the structure shown in FIG. 7B, the capacitor substrate 11 is provided between the lower yoke 3 and the first and second ports P1, P2. Become.
Comparing the structures shown in FIGS. 7A and 7B, in the structure of FIG. 7B, the ground side of the capacitor substrate 11 is grounded to the lower yoke 3, so that a part of the signal path has a high electric resistance, whereas FIG. As shown in FIG. 4, since the support piece 21 of the common electrode 10 is connected to the ground side of the capacitor substrate 1, the entire signal path has low electrical characteristics, so that loss as a non-reciprocal circuit element can be reduced.
[0049]
FIG. 8A shows an example of a circuit configuration of a mobile phone device in which the isolator 1 of the previous embodiment is incorporated. In the circuit configuration of this example, an antenna resonator 41 is connected to an antenna 40, and an ante resonator. A receiving circuit 44 is connected to the output side of 41 via a low noise amplifier (amplifier) 42, a filter 48 and a selection circuit 43, and the isolator 1 and power amplifier (amplifier) of the previous embodiment are connected to the input side of the antenna resonator 41. The transmission circuit 47 is connected via the selection circuit 46 and the selection circuit 46, and the distribution transformer 49 is connected to the selection circuits 43 and 46.
The isolator 1 having the above configuration is used by being incorporated in a circuit of a mobile phone device as shown in FIG. 8A. A signal from the isolator 1 to the antenna resonator 41 side is passed with low loss, but a signal in the opposite direction is It works to increase the loss and cut off. Thus, there is an effect that unnecessary signals such as noise on the amplifier 45 side are not reversely input to the amplifier 45 side.
[0050]
FIG. 8B shows the operation principle of the isolator 1 having the configuration shown in FIGS. The isolator 1 incorporated in the circuit shown in FIG. 8B transmits a signal in the direction of the second port P2 indicated by reference numeral (2) from the first port P1 side indicated by reference numeral (1), but the second of the reference numeral (2). The signal from the second port P2 side to the third port P3 side with the symbol (3) is attenuated and absorbed by the termination resistor 13, and the signal from the third port P3 side indicated by the symbol (3) on the termination resistor 13 side is the symbol (1). The signal to the 1st port P1 side shown by is cut off.
Therefore, the effects described above can be achieved when the circuit shown in FIG.
[0051]
FIG. 9 shows an electrode part 35 applied to the nonreciprocal circuit device according to the second embodiment of the present invention. The electrode part 35 of this embodiment has the same configuration as the electrode part 16 of the previous embodiment. Elements are denoted by the same reference numerals, and descriptions thereof are omitted.
The difference between the electrode portion 35 of this embodiment and the electrode portion 16 of the previous embodiment is that the first line conductor 6 and the second line conductor 7 are different from the base portion of the common electrode 10 with respect to the main body portion 10A. The recesses 10f having the same length (depth) as the first base conductor 6a are formed, and the line lengths of the line conductors 6 and 7 are further increased. Further, by forming a recess 10g having the same length (depth) as the previous recess 10f at the base of the third line conductor 8, the line length of the third line conductor 8 is further increased. .
[0052]
As shown in the embodiment of the figure, the main conductor 10A of the common electrode 10 is formed with deeper recesses 10f and 10g than in the previous embodiment to increase the effective line length of the line conductors 6, 7, and 8. May be adopted. In this case, it is necessary to arrange an insulating layer up to the side where the recesses 10f and 10g are formed and to insulate each line conductor 6, 7, and 8 individually on the back side of the magnetic substrate 5. The line conductor 8 may be formed by dividing or bending the divided conductors 8b1 and 8b2 in parallel as in the embodiment described later.
By adopting the above structure, the inductance of the center conductors 6, 7 and 8 is further increased, so that the area of the resonance capacitance can be reduced, in other words, the area of the capacitor substrates 11 and 12 can be reduced. As a whole, it contributes to miniaturization.
[0053]
The figure shows an electrode part 36 applied to the nonreciprocal circuit device of the third embodiment according to the present invention. In the electrode part 36 of this form, the electrode part 16 of the first embodiment and The same components are denoted by the same reference numerals, and description thereof is omitted.
The difference between the electrode portion 36 of this embodiment and the electrode portion 16 of the previous embodiment is that the center conductor 80b of the third line conductor 80 is divided into divided conductors 80b1 and 8b2, and the divided conductor 80b1 It is bent not to be parallel to the divided conductor 8b2 but to be parallel to the divided conductor 8b2. Accordingly, the third central conductor 80b is formed in an L shape. The third center conductor 80b is described in a bent (bent) shape, but it is needless to say that the third center conductor 80b may have a bent shape or a bent portion. Furthermore, these divided conductors are not limited to the L-shape, and may be of a zigzag shape, a shape bent in a waveform, or the like.
Even in the structure including the third line conductor 80 including the divided conductors 80b1 and 8b2 having such a shape, the substantial conductor length of the line conductor 80b is increased to reduce the low frequency as the nonreciprocal circuit element. Downsizing and downsizing can be achieved.
[0054]
FIG. 11 shows a fourth embodiment of a non-reciprocal circuit element (isolator) according to the present invention, and an isolator 50 of this form is provided inside a closed magnetic circuit composed of an upper yoke 51 and a lower yoke 52. In other words, between the upper yoke 51 and the lower yoke 52, a magnet member 55 made of a rectangular plate-like permanent magnet, a spacer member 56, a magnetic assembly 57, capacitor plates 58, 59, 60, a terminal resistor 61, and these are connected. The resin case 62 is accommodated.
The magnetic assembly 57 is configured by winding an electrode portion 16 equivalent to the electrode portion 16 of the first embodiment around a magnetic substrate 65 having a substantially rectangular shape in plan view. The magnetic substrate 65 has substantially the same shape as the horizontally long magnetic substrate 5 of the above-described form, but has a rectangular plate shape slightly close to a square shape.
Also in the isolator 50 having the structure shown in FIG. 11, the same effect as that of the isolator 1 of the previous embodiment can be obtained.
[0055]
FIG. 12 shows another form of the magnetic substrate, and the magnetic substrate 60 of this form has a substantially rectangular shape in plan view, and has a shape having L-shaped cutout receiving portions 61 at four corners. One of the two planes constituting one receiving portion 61 is a receiving surface 61a for folding the line conductor 6 and one of the two planes constituting the other receiving portion 61 Is a receiving surface 61b for turning back the line conductor 7, and the receiving surfaces 61a and 61b are configured so that the first center conductor 6b and the second center conductor 7b of the electrode portion 16 are accurately turned back. Yes.
The magnetic substrate 60 in this form also has a substantially rectangular shape that is horizontally long in a plan view. Specifically, the long sides 60a and 60a facing each other and the short sides 60b and 60b extending in a direction perpendicular thereto are described first. The magnetic substrate 60 having a substantially rectangular shape in plan view is constituted by the two sides constituting the receiving portion 61.
By using this magnetic substrate 60, the same effect as in the case of the first embodiment can be obtained.
[0056]
FIG. 13 shows still another example of the magnetic substrate. The magnetic substrate 70 of this embodiment has a substantially rectangular shape in plan view and has planar receiving portions 71 at four corners, and the short side is a curve. It is made into the shape of a substantially race track. This shape is also included in the concept of a substantially rectangular shape in the present invention. More specifically, the magnetic substrate 70 includes long sides 70a and 70a facing each other and elliptical arc-shaped short sides 70b and 70b connecting the ends of the long sides 70a and 70a, and the long sides 70a and 70a. The first center conductor 6b, the second center conductor 7b, and the third center conductor 8 of the electrode portion 16 described above are accurately connected by the planar receiving portions 71 and 71 and the long side 70a formed at the end of It can be folded back.
By using this magnetic substrate 70, the same effect as in the case of the first embodiment can be obtained.
[0057]
【The invention's effect】
  As described above, the present invention provides a rectangular magnetic substrate inside a rectangular case-shaped yoke, and the magnetic substrate.A first line conductor disposed along a diagonal on the surface side, a second line conductor disposed along another diagonal on the surface of the magnetic substrate, and a central portion on the surface side of the magnetic substrate. AlongBe placedThirdA line conductor, a plurality of rectangular capacitor substrates disposed on the sides of the magnetic substrate, and a magnet member for applying a magnetic field to the magnetic substrate;The tip conductor of the first line conductor provided at the tip of the first line conductor changes direction from the direction of the first line conductor at one side end of one long side of the magnetic substrate. And provided along the extension of the short side of the magnetic substrate and the inner surface of the yoke, and the tip conductor of the second line conductor provided at the tip of the second line conductor is connected to one of the magnetic substrates. The direction of the second line conductor is changed from the direction of the second line conductor at the other side end of the long side, and provided along the extension of the other short side of the magnetic substrate and the yoke inner surface,Each end of the plurality of line conductors is connected to the capacitor substrate, and the magnetic substrateAlong the long side of the magnetic substrateThe capacitor substrate is housed on both sides of the magnetic substrate.In the short side direction, the magnetic substrateThe width is smaller than the inner width of the yokeThus, the aspect ratio of the magnetic substrate is in the range of 25% (1: 4) to 80% (4: 5).Formed,In the long side direction of the magnetic substrate, the length of the magnetic substrate and the inner width of the yoke are substantially the same,The capacitor substrate can be accommodated in a space around the magnetic substrate inside the yoke.
  Furthermore, the present invention requires that one of the two capacitor substrates disposed on both sides in the width direction of the magnetic substrate is a common capacitor substrate connected to the plurality of line conductors. Can be made with a small capacitor footprint.
[0058]
Furthermore, in the present invention, the line conductor can be pressed against the magnetic substrate by wrapping and connecting the end portion of the line conductor from the magnetic substrate side to the capacitor substrate side. On the other hand, a plurality of line conductors can be brought into close contact with each other, contributing to stabilization of characteristics as a nonreciprocal circuit element, and a high quality nonreciprocal circuit element having good characteristics and stability can be obtained.
[0059]
Furthermore, in the present invention, when the portions where the divided conductors are overlapped are arranged so as to be displaced in plan view, the divided conductors are arranged so as to fit evenly in plan view on the other surface side of the magnetic substrate. Furthermore, when all of the overlapping portions of the divided conductors of the first line conductor, the second line conductor, and the third line conductor are displaced in plan view, the portion where the three divided conductors are overlapped Since it does not occur, the occurrence of unevenness due to the occurrence of the two overlapping portions and the three overlapping portions of the divided conductors on the other surface side of the magnetic substrate is reduced, and the unevenness on the other surface side of the magnetic substrate is reduced.
[0060]
In the present invention, since the end portion side of the line conductor is wound and connected from the magnetic substrate side to the capacitor substrate side, the line conductor can be pressed against the magnetic substrate. A plurality of line conductors can be brought into close contact with each other, contributing to stabilization of characteristics as a nonreciprocal circuit element, and a high quality nonreciprocal circuit element having good characteristics and stability can be obtained.
[0061]
By making only two overlapping portions of line conductors and not generating three overlapping portions, it is possible to make the height of the mountain-shaped overlapping portions generated in the overlapping portions of the line conductors low and uniform. Thereby, since all the thickness of the overlapping part of a line conductor can be equalized, when a magnet member presses down a line conductor, it becomes possible to hold down all the line conductors uniformly, and to all the magnetic substrates. The adhesion of the line conductor can be made uniform, contributing to stabilization of characteristics as a non-reciprocal circuit element.
[0062]
In the present invention, by using at least one of the capacitor substrates as a common capacitor substrate that is connected to a plurality of line conductors, a large capacity can be obtained with a small capacitor occupied volume, and the size of the nonreciprocal circuit element can be reduced. Contribute.
[Brief description of the drawings]
FIG. 1A is a plan view showing a state in which a part of an isolator according to a first embodiment of the present invention is removed, and FIG. 1B is a cross-sectional view of the isolator.
FIG. 2 is a plan view showing an example of a magnetic substrate used in an isolator according to the present invention.
FIG. 3 is a development view of an electrode portion used in an isolator according to the present invention.
4A is a plan view showing a lower yoke of an isolator according to the present invention, and FIG. 4B is a side view of the lower yoke.
FIG. 5 is a side view showing an upper yoke of the isolator.
FIG. 6 is a perspective view showing an example of a spacer member provided in the isolator.
7A is a schematic diagram showing a connection state of a common electrode, a capacitor substrate, and a magnetic substrate provided in the isolator, and FIG. 7B is a schematic diagram showing a modification of the structure shown in FIG. 7A.
FIG. 8A is a diagram showing an example of an electric circuit provided with this type of isolator, and FIG. 8B is a diagram showing an operation principle of the isolator.
FIG. 9 is a view showing a second example of the electrode portion of the isolator according to the present invention.
FIG. 10 is a diagram showing a third example of the electrode portion of the isolator according to the present invention.
FIG. 11 is an exploded perspective view showing another embodiment of the isolator according to the present invention.
FIG. 12 is a plan view showing another example of a magnetic substrate applied to the isolator according to the present invention.
FIG. 13 is a plan view showing another example of a magnetic substrate applied to the isolator according to the present invention.
FIG. 14 is a perspective view showing an example of a conventional magnetic assembly.
FIG. 15 is a development view of an electrode portion applied to a conventional magnetic assembly.
FIG. 16 is an exploded perspective view showing an example of a conventional isolator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Isolator, 2 ... Upper yoke, 3 ... Lower yoke, 4 ... Magnet member, 5 ... Magnetic substrate, 6 ... 1st line conductor, 6b ... 1st center conductor, 6b1, 6b2 ... 1st division | segmentation conductor , 7 ... second line conductor, 7b ... second center conductor, 7b1, 7b2 ... second divided conductor, 8 ... third line conductor, 8b ... third center conductor, 8b1, 8b2 ... third Divided conductors, 11, 12 ... Capacitor substrate, 13 ... Terminating resistor (resistive element), 16 ... Electrode part, 18, 19 ... Slit part, 21, 22 ... Supporting piece, 30 ... Spacer member, 31a ... Leg part (convex part) ), 31b ... accommodating recess, 31c ... through hole, 40 ... electrode part, 50 ... isolator, 60, 70 ... magnetic substrate, L1, L2 ... diagonal lines.

Claims (2)

長方形のケース状のヨークの内部に、長方形状の磁性体基板と、該磁性体基板表面側の対角線に沿って配置される第１の線路導体と、該磁性体基板表面側の別の対角線に沿って配置される第２の線路導体と、該磁性体基板表面側の中央部に沿って配置される第３の線路導体と、前記磁性体基板の側方に配置される長方形状の複数のコンデンサ基板と、前記磁性体基板に対して磁界を印加するための磁石部材とが具備されてなり、
前記第１の線路導体の先端に設けられた第１の線路導体の先端導体が、前記磁性体基板の一方の長辺側の一側端部において前記第１の線路導体の向きから方向を変えられて前記磁性体基板の短辺の延長線とヨーク内面に沿って設けられ、前記第２の線路導体の先端に設けられた第２の線路導体の先端導体が、前記磁性体基板の一方の長辺側の他側端部において前記第２の線路導体の向きから方向を変えられて前記磁性体基板の別の短辺の延長線とヨーク内面に沿って設けられ、前記複数の線路導体の各端部が前記コンデンサ基板に接続されてなり、
前記磁性体基板の長辺に沿って前記磁性体基板の両側に前記コンデンサ基板が収納され、前記磁性体基板の短辺方向において、前記磁性体基板の幅が、前記ヨークの内幅よりも小さくなるように、磁性体基板の縦横比が２５％（１：４）以上、８０％（４：５）以下の範囲で形成され、
前記磁性体基板の長辺方向において、磁性体基板の長さと前記ヨークの内幅がほぼ同じであることを特徴とする非可逆回路素子。In a rectangular case-shaped yoke, a rectangular magnetic substrate, a first line conductor disposed along a diagonal on the surface of the magnetic substrate, and another diagonal on the surface of the magnetic substrate A second line conductor disposed along the center of the magnetic substrate surface side, a third line conductor disposed along the central portion of the magnetic substrate surface side, and a plurality of rectangular shapes disposed on the sides of the magnetic substrate. A capacitor substrate and a magnet member for applying a magnetic field to the magnetic substrate;
The tip conductor of the first line conductor provided at the tip of the first line conductor changes direction from the direction of the first line conductor at one side end of one long side of the magnetic substrate. And provided along the extension of the short side of the magnetic substrate and the inner surface of the yoke, and the tip conductor of the second line conductor provided at the tip of the second line conductor is connected to one of the magnetic substrates. The direction of the second line conductor is changed from the direction of the second line conductor at the other side end of the long side, and is provided along an extension of another short side of the magnetic substrate and the inner surface of the yoke . Each end is connected to the capacitor substrate,
The capacitor substrate is accommodated on both sides of the magnetic substrate along the long side of the magnetic substrate, and the width of the magnetic substrate is smaller than the inner width of the yoke in the short side direction of the magnetic substrate. The aspect ratio of the magnetic substrate is formed in the range of 25% (1: 4) or more and 80% (4: 5) or less ,
A nonreciprocal circuit device , wherein the length of the magnetic substrate and the inner width of the yoke are substantially the same in the long side direction of the magnetic substrate . 前記磁性体基板の幅方向両側に配置された２つの前記コンデンサ基板のうち、一方の前記コンデンサ基板が前記複数の線路導体に接続された共通のコンデンサ基板とされ、該コンデンサ基板の両端部のうちの一方の端部に前記第１の線路導体の先端導体が、他方の端部に前記第２の線路導体の先端導体が接続されたことを特徴とする請求項１に記載の非可逆回路素子。Of the two capacitor substrates disposed on both sides in the width direction of the magnetic substrate, one of the capacitor substrates is a common capacitor substrate connected to the plurality of line conductors , and of both ends of the capacitor substrate 2. The nonreciprocal circuit device according to claim 1 , wherein a tip conductor of the first line conductor is connected to one end of the first conductor, and a tip conductor of the second line conductor is connected to the other end. .
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