To quantify the effect of air gap on the dielectric constant measurement of low-loss materials, this letter presents the first quantitative study of the effect of five different shapes on the dielectric constant measurement using three low-loss materials as examples. The experimental results show that if low-loss materials’ dielectric constant measurement error is controlled within 5%, the air gap cannot exceed 4%. The results of this letter can provide effective guidance and reference for improving the measurement accuracy of electromagnetic parameters of low-loss materials.

中文翻译：

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不同形状对X波段矩形波导低损耗材料介电常数测量的影响

为了量化气隙对低损耗材料介电常数测量的影响，本文以三种低损耗材料为例，首次对五种不同形状对介电常数测量的影响进行了定量研究。实验结果表明，如果低损耗材料的介电常数测量误差控制在5%以内，则气隙不能超过4%。该信的结果可为提高低损耗材料电磁参数的测量精度提供有效的指导和参考。