BS EN 61189-2-721:2015概述了确定相对介电常数（ε）的方法 r） 和损失 覆铜板的正切（tanδ）（也称介电常数（Dk）和损耗因数（Df）） 使用分裂柱电介质在微波频率（从1.1 GHz到20 GHz）下的层压板 谐振器（SPDR）。IEC 61189的本部分适用于覆铜层压板和电介质基材。购买本文件时可获得的所有当前修订均包含在购买本文件中。

BS EN 61189-2-721:2015 outlines a way to determine the relative permittivity ( ε r) and loss tangent (tanδ ) (also called dielectric constant (Dk) and dissipation factor (Df)) of copper clad laminates at microwave frequencies (from 1,1 GHz to 20 GHz) using a split post dielectric resonator (SPDR).This part of IEC 61189 is applicable to copper clad laminates and dielectric base materials.All current amendments available at time of purchase are included with the purchase of this document.