有关电磁场与高频的问题,请精英们帮忙,急等

jianl_39

<ol type="1" style="MARGIN-TOP: 0cm;"><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">电磁场理论中的</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(E,H,D,B)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">和电路理论中的什么变量相对应</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">怎样从前者推导出后者</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">电磁波在无穷大介质表面发生全反射的条件是什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">电场和磁场在完美电导</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(Perfect Electric Conductor)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">与完美磁导</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(Perfect Magnetic Conductor)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">的边界条件是什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">当它们分别作为镜面边界条件时</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">它们的映像有什么特点</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">微带线</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(microstrip)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">有截至频率</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(cut-off frequency)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">吗</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">为什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">表面阻抗的单位欧拇</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">/</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">平方与体阻抗的单位欧拇之间的关系是什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">在使用并行平板电容公式时</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">在什么情况下误差增大</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">为什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">当两段结构不同的</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">50</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Symbol; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">W</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">
                        </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">传输线</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">比如一段同轴线和一条微带线</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">相联时</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">反射系数为零吗</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">为什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">当一个电磁问题中整个物体的结构按比例线性放大或缩小时</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">什么变量作相应的缩小或放大后</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">,&nbsp; </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">整个运算结果可以重复使用</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">电磁波的相速可以大于电磁波的速度</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">与爱因斯坦的相对论有抵触</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">但两者都没错</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">. </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">怎么回事</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">当用软件设计微波电路时</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">常常要求元件</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">如微带线等</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">间隔一定的距离</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">这并非是微波理论的要求</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">. </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">知道是为什么吗</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">如要把这个局限去掉</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">该怎么办</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">当给定一组两端口网络的散射参数</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">怎样从它判断这个网络是否有损耗</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">为什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li><li class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;"><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">&nbsp;</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">一般说来</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">, </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">散射系数</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(S-Parameter)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">是个整方型矩阵</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">.&nbsp; </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">任意一个传输系数</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">(T-Parameter)</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">都必须是整方型矩阵吗</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-font-kerning: 0pt;">为什么</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-font-kerning: 0pt;">? </span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-font-kerning: 0pt;"><p></p></span></li></ol>