Measurement of the complex refractive index of concrete at 57.5 GHz

被引：54

作者：

Sato, K ^{[1
]}

Manabe, T ^{[1
]}

Polivka, J ^{[1
]}

Ihara, T ^{[1
]}

Kasashima, Y ^{[1
]}

Yamaki, K ^{[1
]}

机构：

[1] KAJIMA TECH RES INST,CHOFU,TOKYO 182,JAPAN

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 1996年 / 44卷 / 01期

关键词：

D O I：

10.1109/8.477526

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The complex refractive index of concrete is measured at 57.5 GHz by the combined use of free-space reflection and transmission methods. The measured refractive index of the concrete 14 months after concreting was 2.55-j0.084. This index, in particular the imaginary part, is sensitive to the curing time after concreting and the water content. The transmission coefficient of a concrete plate, mainly determined from the imaginary part of the complex refractive index, is less than -20 dB/cm when the concrete is fresh and moist and reaches -9 dB/cm after aging for fourteen months. In contrast, the reflection coefficient of a concrete plate is less dependent on water content.

引用

页码：35 / 40

页数：6

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