自由空间和圆形隧道中漏泄电缆的空间损耗特性

The Space Loss Characteristics of Leaky Coaxial Cable in Free Space and Round Tunnel

与标准测试中规定的自由空间完全不同,漏泄同轴电缆一般应用于隧道等封闭空间。为了全面反映漏泄同轴电缆辐射电场特性,从纵向耦合损耗、径向耦合损耗及圆周耦合损耗三方面对漏泄同轴电缆的空间损耗进行了全面研究,并介绍了三种空间损耗的测试方法。最后,利用自主设计、建设的圆形模拟隧道测试系统对封闭环境和自由空间环境中的漏泄同轴电缆的空间损耗性能进行了实验测试对比及分析,为工程设计提供重要依据。

Leaky coaxial cable is generally used in tunnels and other closed spaces, which is different from in free space defined by the standard test method. In order to fully describe the radiated electric field characteristics of leaky coaxial cable, the space loss of leaky coaxial cable is studied from three aspects, i.e. the longitudinal coupling loss, the radial coupling loss, and circumferential coupling loss, and three methods for space loss test are introduced. At last, the space loss characteristics of leaky coaxial cable in both free space and closed environment are tested and compared by the self-developed testing system which simulates round tunnels, so as to provide an important reference for engineering design.