改进加顶结构的甚低频发信天线阻抗特性分析

针对甚低频发射天线输入电抗高、输入电阻小而导致的天线Q值高、带宽窄、输入功率受限、天线系统效率低等问题,研究了伞型和T型甚低频发射天线的顶负载在不同电气连接方式下的天线输入阻抗,提出在不改变天线总体结构的情况下,改变顶负载电气连接方式可优化天线的输入阻抗的方法．计算结果和理论分析均表明,优化后的天线顶负载连接方式可降低甚低频发射天线的输入容抗、提高天线的输入电阻,从而可提高天线系统效率和功率容量、增加天线带宽,对改善甚低频发射天线性能和提高天线电气工作安全性具有重要意义．

VLF transmit antenna impedance characteristic based on top-Load configuration

Aiming at the problems of high Q, narrow bandwidth, limited input power, low efficiency of antenna system, which are caused by the low radiation resistance and the high reactance of the VLF transmit antenna, this paper proposes a new idea to study the input impedance of VLF transmit antenna under the different loaded electrical connection without changing the overall structure. The calculation results and theoretical analysis indicate that optimized top load connection can decrease the input impedance of the VLF transmit antenna, improve the input resistance of the antenna, thus improve the efficiency and power capacity of the antenna system, and increase the antenna bandwidth. This has a significance to improve the performance of the VLF transmit antenna and increase the antenna work safety.