时域反射测量计在微波电路仿真中的应用

摘要

在微波电路设计中，不连续性结构造成的阻抗失配是经常遇到的工程问题，并往往成为限制电路性能的瓶颈。时域反射计（Time Domain Reflectometry， TDR）是一个由测量领域引出的概念，可用于传输线上断点、故障点的定位，近年来也被逐渐引入到微波电路不连续结构的仿真和优化中。对 TDR 的工作原理进行了阐述和分析，并使用 ANSYS 公司的 HFSS 对同轴低阻短截线、使用 CST 公司的 MICROWAVE STUDIO 对金丝键合两种匹配实例进行了 TDR 分析和优化，均取得到了较好的匹配效果，从而证明了 TDR 在微波电路仿真中的价值。%In design process of microwave circuit,mismatching caused by discontinuities is always encountered by engineers.The principle of TDR is firstly introduced in the field of measurement techniques,which is convenient for broken and questionable point searching on transmission lines.In recent years,TDR is also introduced in simulation and optimization of microwave circuit discontinui-ties.Principle and application of TDR in microwave circuit simulation are discussed.Commercial software HFSS developed by ANSYS Corp.is employed to analyze impedance matching of low impedance stub,and MICROWAVE STUDIO developed by CST Corp.is em-ployed to analyze compensation of bond-wire by TDR method.Good results are achieved,while the value of TDR in microwave circuit simulations is also validated.