近场环境下漏泄同轴电缆辐射特性研究

Research on Radiation Characteristics of Leaky Coaxial Cables in the Near-field Environment

论文对近场环境下漏泄同轴电缆的多径、耦合度动态范围等辐射特性进行了研究。自由空间中仿真结果表明,近场环境下漏泄同轴电缆引起的多径效应并不明显,耦合度最大动态范围不超过7dB。模拟环境中仿真结果表明,收发天线沿漏缆轴向、法相运动时多径效应明显,耦合度动态范围可达34dB。搭建了准近场环境,测试结果表明,漏泄同轴电缆与收发天线间耦合度动态范围约40dB,即基于该无线信号覆盖方案的通信系统链路预算衰落余量设计指标应为20dB。信道时延功率谱的分析进一步验证了准近场环境下多径效应明显,同时存在一条功率较强的直射分量,验证了近场环境下采用漏泄同轴电缆进行无线信号覆盖的可行性。

In this paper,the radiation characteristics such as multipath and coupling of leaky coaxial cables in a near-field en⁃vironment are investigated.Simulation results in free space show that the multipath effect caused by leaky coaxial cables in the near-field environment is not significant,and the maximum dynamic range of the coupling does not exceed 7dB.The simulation re⁃sults in a simplified model show that the multipath effect is obvious when the transceiver antenna moves along the axial and normal phase of the leaky cable,and the dynamic range of coupling can reach 34dB.A quasi-near-field environment is built,and the test results show that the dynamic range of coupling between the leaky coaxial cable and the transceiver antenna is about 40dB,which means that the design index of the budget decay margin of the communication system link based on the wireless signal coverage scheme should be 20dB.The analysis of the power delay profile further verifies that the multipath effect is obvious in the qua⁃si-near-field environment,and that there exists a direct component with higher power,which verifies the feasibility of using leaky coaxial cable for wireless signal coverage in the near-field environment.