Low density dielectric having low microwave loss
    1.
    发明授权
    Low density dielectric having low microwave loss 有权
    具有低微波损耗的低密度电介质

    公开(公告)号:US06562448B1

    公开(公告)日:2003-05-13

    申请号:US09544067

    申请日:2000-04-06

    IPC分类号: B32B500

    摘要: Disclosed is a composite material comprising a matrix material comprising a microwave transmissive polymer; and from about 1 to 65 volume percent of a particulate filler dispersed in the matrix. This particulate filler is characterized by an electrically conductive coating on the filler particles, particles selected from spheroids and ellipsoids having a major dimension below about 0.5 mm and particles having an aspect ratio greater than about 2 to 1 having a minor dimension below 100 &mgr;m, and a combination of particle size and coating thickness sufficient to yield a combination of a composite material dielectric constant between about 1.2 to 100, and a composite material microwave loss tangent no greater than about 0.10 at 1 GHz.

    摘要翻译: 公开了一种复合材料,其包含基质材料,其包含微波透射聚合物; 和约1至65体积%的分散在基质中的颗粒填料。 该颗粒填料的特征在于在填料颗粒上的导电涂层,选自球形体和椭圆体的颗粒,其主要尺寸低于约0.5mm,具有大于约2:1的纵横比的颗粒具有小于100μm的小尺寸,以及 足以产生约1.2至100之间的复合材料介电常数的组合的粒度和涂层厚度的组合以及1GHz下的复合材料微波损耗角正切不大于约0.10。

    Method for measuring stress levels in polymeric compositions
    10.
    发明授权
    Method for measuring stress levels in polymeric compositions 失效
    测量聚合物组合物应力水平的方法

    公开(公告)号:US06767745B2

    公开(公告)日:2004-07-27

    申请号:US09358738

    申请日:1999-07-21

    IPC分类号: G01N2772

    摘要: A method of measuring inductance or inductive reactance of a sample is provided. The method comprises the steps of: (a) providing an instrument for measuring the inductance or the inductive reactance of the sample; (b) subjecting a portion of the instrument to different temperatures and recording data corresponding to the performance of the instrument portion at each temperature; (c) measuring the inductance or the inductive reactance of the sample using the instrument; and (d) correcting the measurement of inductance or inductive reactance for temperature based on the performance data.

    摘要翻译: 提供了一种测量样品的电感或电感的方法。 该方法包括以下步骤:(a)提供用于测量样品的电感或感抗的仪器; (b)使仪器的一部分经受不同温度,并在每个温度下记录与仪器部分的性能相对应的数据; (c)使用仪器测量样品的电感或感抗; 和(d)基于性能数据校正温度的电感或感抗的测量。