A NEW METHOD FOR SOLVING DYADIC GREEN''''S FUNCTION OF ELECTROMAGNETIC FIELD

A new method for solving electromagnetic field boundary value problem is given.Byusing this method,the boundary value problem of the vector wave equation can be transformedinto the independent boundary value problem of scalar wave equations and the two additionalvector differential operations.All the dyadic Green's functions got by eigenfunction expansionof the dyadic Green's function can be got by this method easily and some of the dyadic Green'sfunctions for complex systems which are very difficult to get by the ordinary method have beengot by this new method.The dyadic Green's function for a dielectric loaded cavity is one of thegiven examples.     

COMPUTER-AIDED DESIGN OF PARAMETRIC AMPLIFIERS WITH READ-TYPE VARACTORS

In this paper,a computer program is made for studying actual parametric amplifiers withhi-lo doping varactors.The main parameters of the parametric amplifiers e.g.workingfrequency,bias voltage,pumping power and negative resistance,are obtained with this programthen a basis for the design of parametric amplifiers is provided.     

FIELD COMPUTATION FOR DOUBLE-ENTRANCE CAVITY

The eigenfunction of a double entrance cavity is computed by the classical field match method.The result shows that for an entrance cavity with regular drift spout,the classical method of field match fordivided regions has some advantages,that is,it can obtain a very high accuracy with onlv a little computerlime.     

LARGE SIGNAL THEORY OF OROTRON IN CONSIDERATION OF SPACE CHARGE FIELD

An approximate formula of space charge field of orotron in rectangular coordinate system,when one of the boundaries is infinite, is derived. Using this model the self-consistant large signal interactionof orotron with space charge is calculated, and the effect of this charge on the performance of the device isdiscussed.     

关于现代电磁场理论的探讨

该文简述了经典场论中存在的困难,现代电磁场理论如何在现代数学方法与现代物理概念的基础上建立起自恰的理论体系,克服了经典场论的困难,求得了麦克斯韦方程组的自恰解。并在此基础上探讨把宏观与微观的电动力学衔接起来的可能性。     

用算子理论求解和计算异形波导的截止频率

该文用矢量偏微分算子理论通过虚拟边界的电场和磁场的匹配求解特殊结构的异形波导的截止频率,这一方法可以精确而方便地求出几乎所有模式的截止频率。本方法也可以计算带脊波导和其它矩形金属加载的异形波导的传播特性。     

谐振腔中的亥姆霍兹定理及电磁场的本征函数展开问题

本文讨论了谐振腔中亥姆霍兹定理的合理形式,即谐振腔内的电场怎样分解为相互正交的电旋量场和电无旋场的形式。并由此证明:电无旋场可在L类矢量波函数上展开成一收敛的级数,而旋量场可在M和N类矢量波函数上层开成一收敛的级数。这样也就证明了L,M和N类矢量波函数,对谐振腔内的电场组成了一个完备的正交基。     

用矩量法求电磁场并矢格林函数的普遍形式

本文用矩量法导出了在规则边界下电磁场边值问题的一般公式,并由此导出并矢格林函数的普遍形式,应用这一方法,使规则边界下的电磁场边值问题的求解得到普遍解决。这一方法还可以用于其他更复杂的边界问题,例如用于耦合系统,来求解各种耦合系统的本征问题和传输问题。     

电磁波在光栅表面上反射和衍射的理论研究

本文从严格的场匹配方法出发,对电磁波在矩形截面光栅上的反射和衍射进行了理论研究。对这种光栅作为频率扫描天线的计算显示出,不论满足或不满足布喇格条件,在较宽的角度范围内入射,经调节槽宽和槽深都可获得理想的耀射。对于不满足布喇格条件,在两个互易角中较大的一个入射时,-1次衍射波有较高的效率和较宽的频带。而对这种光栅作为奥罗管中反射镜的特性的理论计算指出,它具有极宽的频带。同时本文还给出了不同频率平面波垂直入射时的等效光栅位置,以及电磁波在光栅表面反射时所引起的相位改变。     

相对论效应对GPS单点定位精度的影响

本文研究地球惯性系中相对论效应对GPS单点定位精度的影响。首先从太阳的各向同性Schwarzschild度规出发,计入地球和月球的引力场的贡献,求得地球惯性系中的度规系数goo。然后估算广义和狭义相对论效应对GPS的原子钟频率、GPS卫星的运行轨道以及GPS导航信号传播的影响。在此基础上计算地球、月球和太阳引力场引起的单点定位误差,并分析误差各部分的来源和重要程度。