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1. 发明申请

US20080242754A1 LOW LOSS FOAM COMPOSITION AND CABLE HAVING LOW LOSS FOAM LAYER 审中-公开
标题翻译：低损失泡沫组合物和电缆具有低损耗泡沫层
公开(公告)号：US20080242754A1
公开(公告)日：2008-10-02
申请号：US12136582
申请日：2008-06-10
申请人： Michael F. Champagne , Richard Gendron , Caroline Vachon , Vijay K. Chopra , Hugh R. Nudd , Sitaram Rampalli
发明人： Michael F. Champagne , Richard Gendron , Caroline Vachon , Vijay K. Chopra , Hugh R. Nudd , Sitaram Rampalli
IPC分类号： C08J9/228 , C08J9/00 , B29C45/03
CPC分类号： C08J9/127 , C08J2203/06 , C08J2203/142 , C08J2323/02 , C08L23/06 , C08L23/0815 , C08L23/10 , C08L2203/14 , C08L2666/06
摘要： The invention relates to a low loss foam composition and cable, such as a coaxial cable. The foam composition is formed by heating an olefinic polymer, such as a high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, or a combination thereof, into a molten state composition, optionally with a nucleating agent. The molten mixture is extruded under pressure through a die with a blowing agent comprising an atmospheric gas, such as carbon dioxide, nitrogen or air, and a co-blowing agent selected from hydrofluorocarbons, hydrochlorofluorocarbons, or perfluoro compounds, such as HFC-134a. The cable is formed by extruding the foam composition onto a signal carrying conductor and sheathing the foam-coated signal carrying conductor in an appropriate conducting shield.
摘要翻译：本发明涉及低损耗泡沫组合物和电缆，例如同轴电缆。泡沫组合物通过加热烯烃聚合物如高密度聚乙烯，中密度聚乙烯，低密度聚乙烯，线性低密度聚乙烯，聚丙烯或其组合形成，可任选地与成核剂一起加入到熔融组合物中。熔融混合物在压力下通过包含大气气体如二氧化碳，氮气或空气的发泡剂和选自氢氟碳化合物，氢氯氟烃或全氟化合物如HFC-134a的共发泡剂在模具中挤出。电缆通过将泡沫组合物挤出到信号承载导体上并将泡沫涂覆的信号承载导体覆盖在适当的导电屏蔽中而形成。

2. 发明授权

US4910998A Fluid detection system and method having a coaxial cable with solid, stranded dielectric elements 失效
标题翻译：流体检测系统和方法具有同轴电缆，具有固体，绞合介质元件
公开(公告)号：US4910998A
公开(公告)日：1990-03-27
申请号：US45887
申请日：1987-05-01
申请人： Frank R. Willis , Sitaram Rampalli , Vijay K. Chopra , Robert D. Perelman
发明人： Frank R. Willis , Sitaram Rampalli , Vijay K. Chopra , Robert D. Perelman
IPC分类号： G01N27/02 , G01M3/04 , G01M3/16 , G01N27/07
CPC分类号： G01M3/045 , G01M3/165
摘要： A fluid detection system includes a cable which is capable of being dried easily after coming into contact with the fluid being detected and displays a measurable change in characteristic impedance immediately upon contact with the fluid. The cable comprises an inner conductor and a cylindrical outer conductor disposed in a substantially parallel and coaxial relationship with each other with a dielectric detection layer coaxially disposed between the inner and outer conductors. The outer conductor is of an open braided construction which permits easy passage therethrough of the fluid to be detected. The detection layer comprises a pair of solid dielectric elements stranded around the inner conductor in a double helical configuration and defining an air gap between the two conductors which is adapted to retain the fluid so as to measurably change the characteristic impedance of the cable. A coating of dielectric material is provided around the solid inner conductor, the thickness of which can be controlled to adjust the change in characteristic impedance resulting from the presence of fluid within the dielectric layer. The improved cable construction allows the dielectric layer to be dried quickly even after the cable has been immersed in the fluid so that successive fluid detection measurements may be made without delay.

3. 发明授权

US06649841B2 Corrugated coaxial cable with high velocity of propagation 有权
标题翻译：具有高传播速度的波纹同轴电缆
公开(公告)号：US06649841B2
公开(公告)日：2003-11-18
申请号：US09990105
申请日：2001-11-21
申请人： Vijay K. Chopra , Hugh R. Nudd , James A. Krabec
发明人： Vijay K. Chopra , Hugh R. Nudd , James A. Krabec
IPC分类号： H01B718
CPC分类号： H01B11/1878 , H01B11/1808 , H01B11/1839
摘要： A corrugated coaxial cable including a core with at least one inner conductor and a highly expanded polymeric foam dielectric surrounding the inner conductor. This coaxial cable has a corrugated outer conductor closely encapsulating the foam dielectric. The corrugated coax cable is dimensioned to provide the cable with a velocity of propagation of greater than 90% of the speed of light.
摘要翻译：波纹状同轴电缆，包括具有至少一个内部导体的芯和围绕内部导体的高度膨胀的聚合物泡沫电介质。该同轴电缆具有密封地封装泡沫电介质的波纹状外导体。波纹同轴电缆的尺寸设计成为电缆提供大于光速90％的传播速度。

4. 发明授权

US06717493B2 RF cable having clad conductors and method of making same 有权
标题翻译：具有包覆导体的RF电缆及其制造方法
公开(公告)号：US06717493B2
公开(公告)日：2004-04-06
申请号：US10100541
申请日：2002-03-18
申请人： Vijay K. Chopra , Hugh Robert Nudd
发明人： Vijay K. Chopra , Hugh Robert Nudd
IPC分类号： H01P306
CPC分类号： H01P3/06 , H01P11/005
摘要： An RF coaxial cable with clad conductors includes an inner tubular conductor having a first base layer formed of a relatively higher conductivity material, and a first bulk layer formed of a relatively lower conductivity material. The first base layer of higher conductivity material extends over an area greater than an area of the first bulk layer to form first margin regions composed of only the higher conductivity material. The first margin regions of the first base layer of the higher conductivity material are joined together to form the inner tubular conductor with only the first margin regions of the higher conductivity material being joined. Also included is a dielectric material surrounding the inner conductor, an outer tubular conductor formed in the same manner as the inner conductor. The first base layer of higher conductivity material of the inner tubular conductor faces outwardly toward the dielectric material and the higher conductivity material corresponding to the outer tubular conductor faces inwardly toward the dielectric material.
摘要翻译：具有包覆导体的RF同轴电缆包括具有由相对较高导电性材料形成的第一基底层和由相对较低导电性材料形成的第一本体层的内部管状导体。较高导电性材料的第一基底层在大于第一本体层的面积的区域上延伸以形成仅由较高导电性材料构成的第一边缘区域。较高导电性材料的第一基底层的第一边缘区域被连接在一起以形成只有较高导电性材料的第一边缘区域被接合的内部管状导体。还包括围绕内部导体的介电材料，以与内部导体相同的方式形成的外部管状导体。内部管状导体的较高导电性材料的第一基底层朝向介电材料面向外，并且对应于外部管状导体的较高导电性材料向内朝向电介质材料。

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