双漏缆电磁耦合传感器设计

传统安防警戒领域中使用的传感器常常受到天气、光线、地形等环境因素制约，为了解决这一问题，迫切需要一种新的周界入侵探测系统传感器．基于双根漏泄同轴电缆构建电磁耦合传感器，以阵列天线理论分析其工作原理，并运用电磁仿真软件HFSS分析其端口传输特性，提出了一种新型电磁传感器设计方法．依据国家标准选取工作频率为40MHz的HLRHTCYZ-50-42L型单根漏泄同轴电缆，构建漏泄同轴电缆仿真模型进行电气性能仿真分析和优化，获得了八字槽缝隙的长度和倾角制约耦合损耗和传输损耗的变化规律;进行了单根漏泄同轴电缆电气性能实测，水平和垂直取向方式的耦合损耗(95％)实测值分别为62.6dB和64.3dB．实测结果与仿真结果吻合良好．

Design of the electromagnetic coupling sensor based on double leaky coaxial cables

In order to solve the security issues of the important facilities, districts and national boundaries caused by a threat to terrorists and other insecurity factors, it is an urgent need that the intruder detection system is designed by new technologies and methods. Based on the double leaky coaxial cable, a novel electromagnetic coupling sensor is structured, its working principle is analyzed with the array antenna theory, the transmission characteristic of the port is simulated by the electromagnetic simulation software HFSS, and a new approach to designing the electromagnetic sensor is put forward. According to the national standard, the HLRHTCYZ-50-42L leaky coaxial cable with the operating frequency of 40MHz is selected as the simulation model, the electrical performance of the model is simulated and optimized, the changes of the transmission attenuation and coupling loss with the length and inclination of LCX's aperture are obtained. The electrical characteristics of the single LCX are measured, the coupling losses (95％) of the horizontal and vertical orientations are 62.6dB and 64.3dB, respectively. The measured results are in agreement with the simulation results.