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微带电路和器件在机载系统和空间系统中得到了越来越广泛的应用。为了对这些电路和器件进行计算机辅助设计,就必须获得一些微带中不连续特性的精确参数。微带中的裂缝是微带不连续中最常见的一种。本文叙述用谐振法来测试微带中裂缝的方法。由于试件加工的不完善,常常会碰到试件中被测裂缝偏离谐振电路中心的现象。这将影响到测试的精度,作者对此进行了分析,作出了一些假设,给出了裂缝在这种情况下在不同谐振模式的等效电路,并导出从所测得的谐振频率来计算裂缝电容的公式。计算机可对测试电路仿真,还可用来分析耦合回路和失配负载对测试带来的影响。对裂缝偏离谐振电路中心的情况也可仿真。验证前面所作的假设和推导的公式。也对实验结果进行仿真,指出一些修正方法。文中还指出计算机控制测试不仅可用来实现数据采集自动化,而且还可把测得的数据储存起来,输入到一些应用程序中去以供计算机辅助设计使用。最后指出这些分析方法不仅适用于微带中的裂缝问题,还同样适合于微带及其他传输线(如同轴线)中的一系列不连续问题。
Microstrip circuits and devices are gaining more and more widespread use in on-board systems and space systems. In order to computer-aided design of these circuits and devices, it is necessary to obtain some precise parameters of discontinuities in the microstrip. The cracks in the microstrip are the most common kind of microstrip discontinuities. This article describes a method for testing cracks in a microstrip using a resonant method. Due to imperfections in specimen processing, the phenomenon that the measured crack in the specimen deviates from the center of the resonant circuit is often encountered. This will affect the accuracy of the test. The authors have analyzed this and made a number of assumptions, given the equivalent circuit of the crack in this case in different resonant modes and derived the crack from the measured resonant frequency Capacitance formula. Computer simulation of the test circuit can also be used to analyze the coupling loop and mismatch load on the test impact. The case of cracks deviating from the center of the resonant circuit can also be simulated. Verify the previous assumptions and derived formulas. The experimental results are also simulated, pointing out some correction methods. The article also pointed out that computer control testing can not only be used to automate data collection, but also the measured data stored and imported into some applications for computer-aided design. Finally, it is pointed out that these analysis methods are not only suitable for the problem of cracks in microstrip, but also suitable for a series of discontinuous problems in microstrip and other transmission lines (such as coaxial lines).