微波铁氧体的介电常数和磁导率的测量

本文利用反射式谐振腔,通过测量放入样品前后谐振腔反射系数的变化,确定介电常数虚部ε″和磁导率虚部μ″。研究了样品形状和放在谐振腔不同位置对介电常数和磁导率测量的影响。测量系统有较高的灵敏度。通过提高谐振腔的品质因数和使谐振腔接近临界耦合,并适当减小谐振腔的体积,使系统测量损耗角正切达到10^-5数量级并不困难。

MEASUREMENT OF THE DIELECTRIC CONSTANTS AND THE PERMEABILITIES OF MICROWAVE FERRITES

The imaginary part of the dielectric constant ε" and of the permeability μ" of the sample were determined by measuring the change of reflection coefficient of a resonance cavity of the reflection type with and without the sample in it. The effects of the shape of the sample and its location in the cavity on the measurement were investigated. The sensitivity of the measuring system was high. By raising the quality factor of the cavity, adjusting it to approach critical coupling, and appropriately choosing a cavity of smaller volume, it should not be difficult to measure the loss factor with this set of measuring devices to an accuracy of the order of 10^-5.