论文标题
建模和测量传输线的非理想特征
Modeling and measuring the non-ideal characteristics of transmission lines
论文作者
论文摘要
我们描述了一种简单的方法，可以通过实验确定传输线的每位长度电阻和电导的频率依赖性。该实验旨在补充传输线对电压步骤或脉冲的瞬态响应的经典测量。在瞬态实验中，传输线的理想（无损）模型用于确定特征阻抗和信号传播速度。在我们的实验中，各种同轴电缆的插入损失是根据1到2000 MHz的频率函数测量的。需要一个包含导体和介电损耗的传输线的完整分布式电路模型，以适应测得的插入损耗的频率依赖性。我们的模型假设通过测量中使用的同轴传输线的几何形状确定的每个单位长度电阻和电导的物理频率依赖性。
We describe a simple method to experimentally determine the frequency dependencies of the per-unit-length resistance and conductance of transmission lines. The experiment is intended as a supplement to the classic measurement of the transient response of a transmission line to a voltage step or pulse. In the transient experiment, an ideal (lossless) model of the transmission line is used to determine the characteristic impedance and signal propagation speed. In our experiment, the insertion losses of various coaxial cables are measured as a function of frequency from 1 to 2000 MHz. A full distributed circuit model of the transmission line that includes both conductor and dielectric losses is needed to fit the frequency dependence of the measured insertion losses. Our model assumes physically-sensible frequency dependencies for the per-unit-length resistance and conductance that are determined by the geometry of the coaxial transmission lines used in the measurements.
