MEASUREMENTS AND CALCULATIONS OF THE IMPEDANCE OF A CYLINDRICAL ANTENNA IN AN ISOTROPIC PLASMA
-
摘要: 本文对可与自由空间波长相比拟的长柱状天线在等离子体中的阻抗进行了实验测量,并与理论计算进行了对比。理论采用EMF方法。考虑到相对介电常数θ′是复数,从而公式中的正弦和余弦积分不是表列函数,需展开成级数直接代入复变量进行计算。对比结果表明,在等离子体频率附近天线阻抗的理论曲线与实验符合较好。这说明我们的计算方法和实验设备对某些空间等离子体探测或技术应用涉及的天线计算和模拟问题可能会有实际的意义。Abstract: Measurements of the impedance of a cylindrical antenna in an isotropic plasma and a comparison with theory have been made.The length of the antenna is comparable to the free space length.The EMF method was employed.Since sine and cosine integrals for complex arguments are not available,direct calculations have been made by substituting complex numbers into relevant expressions.The results showed an agreement between predicted and measured values,especially around plasma fre-quancies.This may be of some practical significance for the calculations and the measuring system described here in applications to certain spase plasma investigations.
-
-
计量
- 文章访问数: 2089
- HTML全文浏览量: 111
- PDF下载量: 662
-
被引次数:
0(来源:Crossref)
0(来源:其他)
下载:
