水平电偶极子在覆盖有等离子体的良导体上产生的电磁场的研究

本文研究了水平电偶极子在覆盖有等离子体的良导体上产生的电磁场。总电磁场包括了直射波,理想反射波,侧面波和缺陷表面波。因为等离子体的折射系数是随频率变化的复杂函数,所以用于计算缺陷表面波的极点函数的解也是频率的函数。研究了频率对极点方程及其解的影响,并分别计算了直射波,理想反射波和侧面波之和、总场强、以及缺陷表面波的值。由于金属表面的介电常数可以在很宽的频率范围内表示为等离子体,所以本文的研究成果可以用于集成微带线电路或者微带天线等。

The EM waves in air from a horizontal electric dipole over a perfect conductor coated with a plasma layer are investigated. The total field includes the direct wave, the ideal reflected wave, the lateral-wave, and the trapped surface wave. Because the refractive index of plasma is a complex function of frequency, the solutions of the pole equations are also a function of frequency. The solutions are used for the computation of the trapped surface wave, and the influences of the frequency to the pole equations and the solutions are investigated. Over a wide frequency range, the properties of metals can be expressed by a plasma model, so the results in the paper are useful in micro-strip circuits and printed antennas.