CAJ | 학술논문

在基于时延测量的高精度测量设备中，对群时延测量的精度要求非常苛刻。在电路实现的过程中，阻抗失配是一种必然存在的现象，这种现象会引起信号传输过程中群时延的变化。电路实现过程中影响阻抗的一个很重要的现象便是趋肤效应，因此在研究阻抗失配对群时延影响时必须要考虑趋肤效应对阻抗的影响。结合射频电路理论、传输线理路、趋肤效应理论，提出了一种宽带信号下阻抗失配引起的群时延变化的一种方法。并以同轴电缆为例进行建模，利用 Matlab 软件计算该方法的精度并与 ADS2009软件的仿真结果进行比对。群时延精度在宽带信号下可达5‰以上。
재기우시연측량적고정도측량설비중，대군시연측량적정도요구비상가각。재전로실현적과정중，조항실배시일충필연존재적현상，저충현상회인기신호전수과정중군시연적변화。전로실현과정중영향조항적일개흔중요적현상편시추부효응，인차재연구조항실배대군시연영향시필수요고필추부효응대조항적영향。결합사빈전로이론、전수선리로、추부효응이론，제출료일충관대신호하조항실배인기적군시연변화적일충방법。병이동축전람위례진행건모，이용 Matlab 연건계산해방법적정도병여 ADS2009연건적방진결과진행비대。군시연정도재관대신호하가체5‰이상。
The group delay’s measuring precision is very rigour to the measuring device base on signal de-lay. But in the process of circuit’s implement,impedance mismatch exists certainly. These phenomena can affect signal delay seriously. Furthermore skin effect affects circuit’s impedance. So it’s important to introduce skin effect when researching on variation caused by impedance mismatch. A method consider RF circuit theory,transmission line theory,skin effect theory was suggested to calculated group delay variation (GDV)caused by impedance mismatch. The method’s precision can get highly than 5‰ when compare to ADS2009 software’s precision by using coaxial as an example compare to the result calculated by Matlab.