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为了获得漏泄同轴电缆作为一种埋地探测传感器的电气特性,研究适用于周界入侵探测系统的漏泄同轴电缆,设计了一种外导体为八字形开槽的漏泄同轴电缆。基于漏泄同轴电缆的理论分析和相关行业标准,利用商业电磁仿真软件Ansoft HFSS,建立了用于计算漏泄同轴电缆传输衰减和耦合损耗等重要电气特性的电磁仿真模型,作为一种工作在VHF频段的埋地传感器,利用实验数据分析其VHF频段工作特性,建立了用于分析耦合损耗特性的埋地传感器系统模型,分析了结构尺寸参数对耦合特性的影响,进一步计算了漏泄同轴电缆的多个电气性能参数及其变化规律。仿真结果表明:在VHF频段,槽口缝隙的长度、倾角会对埋设双缆的接收特性产生影响,槽口越长倾角越大则接收效率越高,作为传感器单元的LCX对比实验表明仿真与实测的结果具有良好的一致性。
In order to obtain the electrical characteristics of a leaky coaxial cable as a buried detection sensor, a leaky coaxial cable suitable for the perimeter intrusion detection system is studied, and a leaky coaxial cable whose outer conductor is a figure eight shaped slot is designed. Based on theoretical analysis of leakage coaxial cable and related industry standards, an electromagnetic simulation model for calculating leakage attenuation and coupling loss of leaky coaxial cable was established by Ansoft HFSS, a commercial electromagnetic simulation software. As an example, Frequency band of buried sensors, the use of experimental data analysis of its VHF band operating characteristics, established for the analysis of coupling loss characteristics of buried sensor system model, the analysis of the structure size parameters of the coupling characteristics of the further calculation of the leakage of coaxial cable Multiple electrical performance parameters and their variation. The simulation results show that in the VHF frequency band, the length and inclination angle of notch in the notch affect the receiving characteristics of the buried cable. The longer the notch is, the higher the receiving angle is, the higher the receiving efficiency is. The comparative experiment of LCX as the sensor unit shows that the simulation and the actual measurement The results have good consistency.