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近年来,在高速公路和一般公路中安装了中波波段的路边通信系统进行通信业务。以前,司机靠路边指示牌及普通无线电广播等获得交通信息,与此比较,路边通信系统能够在信息多的地区,迅速而全面地传输信息。本文叙述了用螺旋泄漏同轴电缆作为天线电缆的路边通信系统的概况,同时,介绍了有关这次研制的螺旋泄漏同轴电缆的设计方法及试制电缆的测量结果。根据测试结果,能确保在信号有效作用区域内有足够高的实用电场强度。
In recent years, roadside communication systems with medium-wave bands have been installed in expressways and general highways to carry out communications services. In the past, drivers received traffic information by roadside signs and ordinary radio broadcasts. By comparison, roadside communication systems were able to transmit information promptly and comprehensively in areas with more information. This paper describes the overview of the roadside communication system using spiral leaky coaxial cable as the antenna cable, and introduces the design method of the spiral leaky coaxial cable and the test results of the prototype cable. Based on the test results, it is ensured that there is a sufficiently high practical electric field strength in the area where the signal is effective.