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本文利用谐振腔反射现象测量圆波导衰减的概念,对矩形波导短样品的衰减进行了测试。本法要求的设备简单、操作方便。曾对0.76米,0.60米,0.22米和0.09米等不同长度、不同质量、不同加工方式的矩形波导样品进行多次测量。结果表明:测量0.1分贝的样品衰减时,随机误差约1.5％,总误差不大于10％。本方法可以分辨不同质量的波导样品。 文中提出了选定线路元件参数以保证所需测量准确度的建议,实验证明这样的选择是恰当的。此外,还利用标准片移式衰减器作了总体验证。
In this paper, the concept of circular waveguide attenuation is measured by the phenomenon of resonant cavity reflection, and the attenuation of short rectangular waveguide sample is tested. The equipment required by this law is simple and easy to operate. The rectangular waveguide samples of different lengths, different qualities and different processing methods, such as 0.76 m, 0.60 m, 0.22 m and 0.09 m, were measured several times. The results show that when the sample attenuation of 0.1 dB is measured, the random error is about 1.5% and the total error is not more than 10%. This method can distinguish waveguide samples of different qualities. In this paper, we propose the parameters of the selected circuit components to ensure the required measurement accuracy. Experiments prove that such a choice is appropriate. In addition, the use of standard chip attenuator for the overall verification.