一、原理将一段同轴线一端短路,另一端以集中电容为负载,就构成闭合的腔体;若用位于直径相反方向的两个耦合环分别来馈入特高频信号和探测信号,则在某特定频率下能观察到谐振现象。这种腔体常称为半同轴谐振腔或凹形谐振腔,适用于100～1000MHz频率下测量,非金属材料的电性能。其主要优点是:机械加工比较容易,尺寸小,不易损坏,品质因素高而稳 First, the principle of a short-circuited one end of the coaxial line, the other end of the capacitor for the load to form a closed cavity; if the two opposite directions in the coupling ring are fed UHF signals and detection signals, then Resonance can be observed at a specific frequency. This cavity is often referred to as a semi-coaxial cavity or a concave resonator and is suitable for electrical measurements of non-metallic materials at frequencies from 100 to 1000 MHz. Its main advantages are: machining is relatively easy, small size, easy to damage, high quality and stability