A Basic Research on Wave-Form Distortion of Ultrawide-Band and Ultra-short Pulses, Which is Caused by Power-Leakage Effect on Planar-Circuit Transmission Lines

功率泄漏效应及其相关现象会对在平面线路上传播的超宽带或超短脉冲造成明显的畸变。这是我们在这项研究中的立场，为了解决这个问题，我们设置了两个并行的实验对象。第一个主题是关于本征溶液行为的研究，因为泄漏溶液的一些不寻常的色散行为的存在产生了一种新型的超短脉冲畸变。实际上，我们发现，在这项研究的早期阶段，可以存在一个频率范围，在这个频率范围内，束缚模式和泄漏模式可以同时传播。在这一发现之后不久，我们也证明了这种同时传播效应实际上是相当普遍的，而不是独特的或罕见的，并且与超短脉冲畸变有非常重要的联系。实际上，我们成功地解释了脉冲尾部的独特畸变，这是由于我们对这种模拟的认识，以及对频散曲线的非线性特性的认识。进一步研究了高频下漏模的色散特性，在高频下漏模应该有几种类型。然后，在本研究的最后阶段，我们还发现可以存在一个频率范围或一个新的频谱间隙，在这个频率范围内，漏模不能传播。本文扼要地研究了这种新的谱隙对脉冲畸变的影响。第二个课题是研究传输线尺寸结构对脉冲畸变的影响。在本研究中，特别关注了金属盒封装平面电路的影响，因为主脉冲的泄漏场在盒表面的多次反射产生的延迟回波脉冲会产生超短脉冲畸变。实际上，成功地得出了这种回波脉冲对在实际平面传输线上传播的脉冲畸变的影响是严重的。少

The power-leakage effect and its related phenomena must cause significant distortion to ultrawide-band or ultrashort pulses propagating on planar-circuit lines. This is our standpoint in this research, and, to attack this problem, we set two subjects running in parallel.The first subject is related to the investigation on the eigen-solution behaviors, because the existence of some unusual dispersion behaviors for leaky solutions yields a new type of ultrashort-pulse distortion. Actully, we discovered, at the early stage of this research, that there can exist a frequency range within which the bound and leaky modes can propagate simultaneously. Soon after this discovery, it was also shown by us that this simultaneous propagation effect is actually quite general, rather than being unique or rare, and is very important in connection with the ultrashort-pulse distortion. Actually, we were successful in explaining the unique distortion in the pulse tail by the knowledge of both this simulta … More neous-propagation effect and the nonlinearity of the dispersion curves. It was continued further to investigate the dispersion behavior of leaky mode at high frequencies, where there should be several types of leaky mode. Then, at the final stage of this research, we also discovered that there can exist a frequency range or a new spectral gap witin which no leaky modes can propagate. A concise study of the effect of this new spectral gap on the pulse distortion was included in this research report.The second subject is to investigate the effect of dimensional structures of transmission lines on the pulse distortion. In this research, a special care is paid on the effect of a metal box packaging planar circuits, because the ultrashort-pulse distortion occurs due to delayd echo pulses produced by the multiple reflection of the leakage fields of the main pulse at box surfaces. Actually, it was successfully concluded that the effect of such echo pulses is serious on the pulse distortion propagating on practical planar transmission lines. Less