理解毫米波频段下Dk的测试方法

Dk（介电常数）是最重要的电路材料参数之一，也是电路设计者的一个设计出发点。包括不同类型传输线的高频电路结构尺寸以及实现隔离或耦合的导线间距等都是由电路材料介电特性确定的，其中一个最主要的介电特性参数就是Dk。

There are many different test methods which can be used to determine Dk (dielectric constant), but very few of these methods are capable at millimeter-wave frequencies.   There are many challenges to defining a test method at millimeter-wave frequencies, such as small wavelengths, radiation, spurious wave propagating modes and unwanted resonances.   This video gives an overview of several test methods which have been used to determine Dk at millimeter-wave frequencies.

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