{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1570572702474780928.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"NAID","@value":"110003248284"}}],"dc:title":[{"@language":"ja","@value":"導体円筒上斜めスロットアンテナの全方向性化によるポラリメトリックボアホールレーダシステムの開発"},{"@language":"en","@value":"Development of polarimetric borehole radar system with an omnidirectional tilted slot antenna on a conducting cylinder"}],"dc:language":"ja","description":[{"type":"abstract","notation":[{"@language":"ja","@value":"直径10数cm程度の坑井内において波長50cm以上の帯域で使用可能なポラリメトリックレーダ用アンテナ対として、導体円筒上斜めスロットアンテナの適応性について地中において実験的に検討した。まず、本アンテナの軸方向偏波成分には周方向に指向性を有していることが確認され、給電点の反対方向に対称にスロットを設け2点同相給電を行うことにより周方向の無指向性化を検討した。さらに、このアンテナの右向き、左向きスロット方向のアンテナ対を用いてポラリメトリック計測を行い、空洞の散乱行列を評価した。その結果、空洞壁面の散乱行列は単位行列に近い値が得られ、また、本計測システムはこれまでのシステムに比べ2倍程度広帯域なシステムであることがわかった。"},{"@language":"en","@value":"We have experimentally examined the applicability of a tilted-slot antenna on a conducting cylinder to a pair of polarimetric radar antennas which can operate in wavelengths more than 50 cm and in a borehole having the diameter of about 10 cm. At first, it has been shown that an azimuthal polarization component of this antenna has significant directivity in soil. In order to reduce the directivity, a dual slotted and dual feed antenna has been introduced. Then, the scattering matrix from wall of a cave has been estimated to closely be a unit matrix in polarimetric borehole radar measurement with the pair of these omni-directional tilted slow antennas. Moreover, it has been cleared that the bandwidth for a polarimetric radar of this system broaden twice."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326219248000","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30313414"},{"@type":"NRID","@value":"1000030313414"},{"@type":"NRID","@value":"9000018657828"},{"@type":"NRID","@value":"9000017686972"},{"@type":"NRID","@value":"9000402000205"},{"@type":"NRID","@value":"9000402000225"},{"@type":"NRID","@value":"9000409905143"},{"@type":"NRID","@value":"9000409643350"},{"@type":"NRID","@value":"9000401807598"},{"@type":"NRID","@value":"9000401790101"},{"@type":"NRID","@value":"9000370742039"},{"@type":"NRID","@value":"9000253481598"},{"@type":"NRID","@value":"9000402008465"},{"@type":"NRID","@value":"9000415234822"},{"@type":"NRID","@value":"9000401781351"},{"@type":"NRID","@value":"9000401799357"},{"@type":"NRID","@value":"9000414751503"},{"@type":"NRID","@value":"9000409643301"},{"@type":"NRID","@value":"9000401799337"},{"@type":"NRID","@value":"9000405107225"},{"@type":"NRID","@value":"9000411369828"},{"@type":"NRID","@value":"9000004884789"},{"@type":"NRID","@value":"9000402008405"},{"@type":"NRID","@value":"9000401807538"},{"@type":"NRID","@value":"9000411483312"},{"@type":"NRID","@value":"9000409644034"},{"@type":"NRID","@value":"9000403546883"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/takashi_miwa"}],"foaf:name":[{"@language":"ja","@value":"三輪 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A・P, アンテナ・伝播"},{"@language":"en","@value":"IEICE technical report. Antennas and propagation"}],"dc:publisher":[{"@value":"一般社団法人電子情報通信学会"},{"@language":"en","@value":"The Institute of Electronics, Information and Communication Engineers"}],"prism:publicationDate":"1998-12-17","prism:volume":"98","prism:number":"474","prism:startingPage":"13","prism:endingPage":"20"},"foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=%E3%83%9D%E3%83%A9%E3%83%AA%E3%83%A1%E3%83%88%E3%83%AA%E3%83%83%E3%82%AF%E3%83%9C%E3%82%A2%E3%83%9B%E3%83%BC%E3%83%AB%E3%83%AC%E3%83%BC%E3%83%80","dc:title":"ポラリメトリックボアホールレーダ"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%B0%8E%E4%BD%93%E5%86%86%E7%AD%92%E4%B8%8A%E6%96%9C%E3%82%81%E3%82%B9%E3%83%AD%E3%83%83%E3%83%88%E3%82%A2%E3%83%B3%E3%83%86%E3%83%8A","dc:title":"導体円筒上斜めスロットアンテナ"},{"@id":"https://cir.nii.ac.jp/all?q=2%E7%82%B9%E7%B5%A6%E9%9B%BB","dc:title":"2点給電"},{"@id":"https://cir.nii.ac.jp/all?q=Polarimetric%20borehole%20radar","dc:title":"Polarimetric borehole radar"},{"@id":"https://cir.nii.ac.jp/all?q=conducting%20cylindrical%20tilted%20slot%20antenna","dc:title":"conducting cylindrical tilted slot antenna"},{"@id":"https://cir.nii.ac.jp/all?q=Dual%20feeding%20points","dc:title":"Dual feeding points"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1570854177450785024","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"導体円筒上斜めスロットアンテナを用いたポラリメトリックボアホールレーダの開発"},{"@language":"en","@value":"Development of polarimetric borehole radar using tilted-slot antenna on a conducting cylinder"}]},{"@id":"https://cir.nii.ac.jp/crid/1571135651699930496","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Cross-polarization borehole radar measurements with a Slot Antenna"}]},{"@id":"https://cir.nii.ac.jp/crid/1573387452221135360","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"ポラリメトリックボアホールレーダ計測のための直達波を用いたアンテナ特性補償法"},{"@language":"en","@value":"Antenna Compensation Method Using Direct Coupling Wave for Polarimetric Borehole Radar Measurement"}]},{"@id":"https://cir.nii.ac.jp/crid/1573950401404055552","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Imaging radar polarimetry from wave synthesis"}]},{"@id":"https://cir.nii.ac.jp/crid/1573950401448926976","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Borehole radar applied to the characterization of hydraulically conducitive fracture zones in crystalline rock"}]}],"dataSourceIdentifier":[{"@type":"CIA","@value":"110003248284"}]}