一种低剖面小型天线的电磁特性分析

The Analysis of Electromagnetic Characteristic on Marine Small-scale Receiving Antenna in MW and SW Bands

某型高精度定位系统基于扩频体制展开设计,在中短波段工作,具有精度高,抗干扰能力强,工作范围大等特点。系统中存在天线体积过大,难于安装以及维护的难点。文中提出了一种基于双Hilbert分形设计的小型天线。同时针对舰船电磁环境恶劣,天线受影响较大的问题,对细导线、同轴线等进行天线建模并分析。结果表明,文中天线高度仅13cm,可以谐振在1.5~10MHz频段,实现了全向接收,能够满足中短波段导航系统要求。

Maritime radio navigation system which is belonged to the spread system, working in the MW and SW section, is provided with high positioning accuracy, wide coverage and good security. However, the antenna is so large that hard to be installed. This paper proposes a new-designed double-Hilbert fractal antenna. Also, because of the abominable electromagnetic condition on the ship, this paper builds on the model of this antenna based on several pivotal techniques which belongs to the FDTD, coaxial line analysis, etc. The results show that the antenna whose height is only 13 cm can work in 1.5 ~10 MHz band with the characteristics of omni-direction, meets requirements of the navigation system working in the MW and SW band.