用FDTD方法计算钢筋混凝土墙对短径传播超宽带脉冲信号的影响

用FDTD方法计算钢筋混凝土墙对短径传播超宽带脉冲信号的影响(中文3400字,英文2300字)
摘要：在时域用有限差分时域（FDTD）法研究超宽带短径传播脉冲信号从宽带圆锥单极天线通过钢筋混凝土墙的建筑物所生成的数值。结果表明，钢筋混凝土墙影响两个发射天线的脉冲信号和散射滤波的波形。
一，引言
当美国联邦通信委员会（FCC）宣布在允许排放的限制下无牌使用频谱从3.1到10.6 GHz，超宽带（UWB）通信逐渐成为一项有趣的技术。
一个超宽带通信信道特性强烈取决于它工作环境的电磁特性。在室内环境下房间内的短路径传输的UWB信号，超宽带脉冲的传播主要依靠人造建筑物墙壁和其他障碍物。因此，脉冲信号波形，穿透混凝土墙建筑物或反射后到达接收天线，往往和发射天线辐射的信号没有多少相似之处，因为脉冲信号和建筑物的墙壁的相互作用导致从发射天线辐射的脉冲波形扭曲。因此，如何理解和预测这些混凝土墙对超宽带脉冲传输的影响是超宽带通信规划系统的基本的一方面。

FDTD Calculation of the Effects of Reinforced
                    Concrete Wall on Short Path Propagation
Abstract ¬ The short path propagation of an UWB pulse generated numerically from a wideband conical monopole antenna through reinforced concrete wall of buildings has been studied in the time-domain using the finite-difference time-domain (FDTD) method. Results demonstrated the effects of both filtering of transmitting antenna and scattering of the reinforced concrete wall on pulse signal waveform.
I. INTRODUCTION
      Ultra-wideband (UWB) communication becomes an interesting technology when the Federal Communications Commission (FCC) announced the unlicensed usage of spectra from 3.1 to 10.6 GHz under certain emission restrictions. The characterization of an UWB communication channel strongly depends on the electromagnetic characteristics of the environment in which it operates. In the environments of the indoor short path propagation of UWB signals inside a room, the UWB pulse propagation is dominated by man-made building walls and other obstacles. As a result, the pulse signal waveform, when reaching receiving antenna after