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本文介绍了一个工作在68.5 GHz、以开放谐振腔为核心的电介质参数测试系统。其工作原理是,以锯齿波对4mm速调管进行扫频,1.25cm体效应管振荡器的注入锁定信号作为本振;改变腔长使开放腔谐振于68.5 GHz;检测从三次谐波混频器输出的中频信号得开放腔的谐振曲线。作者利用这个系统测量了聚四氟乙烯、石英玻璃和TPX等材料的介电常数ε_r,和损耗角正切tan δ;分析表明,系统的ε_r和tan δ测量精度分别为10~(-3)和10~(-5)量级。
This article describes a dielectric parametric test system that operates at 68.5 GHz with an open resonator as the core. Its working principle is to sweep the 4mm klystron with a sawtooth wave, injecting the lock signal of the 1.25cm body-effect-tube oscillator as a local oscillator, changing the length of the cavity to make the open cavity resonate at 68.5 GHz, detecting the signal from the third harmonic mixing IF signal output of the resonator open cavity resonance curve. The system was used to measure the dielectric constant ε_r and loss tangent tan δ of polytetrafluoroethylene, quartz glass and TPX materials. The results show that the measurement accuracy of ε_r and tan δ are 10 ~ (-3) and 10 ~ (-5) order of magnitude.