Spatial power combining of VLF umbrella antenna arrays with multi-delay lines

被引：1
|
作者：
Li B. [1 ]
Liu C. [1 ]
Dong Y.-H. [1 ]
机构：
[1] Department of Electronic Engineering, Naval University of Engineering, Wuhan
来源：
Progress In Electromagnetics Research C | 2018年 / 80卷
基金：
中国国家自然科学基金;
关键词：
D O I：
10.2528/pierc17110502
中图分类号：
学科分类号：
摘要：
The output power of antennas is an important factor affecting the radiation performance of umbrella antenna arrays. Considering the power limit of very-low-frequency (VLF) umbrella arrays and the uncontrollable directivity, we propose a novel method for the spatial power-combining (SPC) of VLF umbrella arrays. Using multiple groups of feeders, the problem of phase shifting of the signals can be solved for VLF arrays. In the high frequency portion of the VLF range (25–30 kHz), this novel method can improve the efficiency of VLF arrays by 26% in the special directivity. A model of a trideco-tower umbrella antenna array is established in the FEKO simulation software. The simulation results show that compared with the in-phase feeding, the VLF transmitting antenna array forms the main beam in all directions. The array gain of the umbrella phased array in the 0◦ (180◦) beam position is larger than 1.1 dB. The front-to-back ratio of the arrays is 3.7 dB. Compared with the in-phase feed mode, the directivity of the phased array enhances and the efficiency increases markedly. The simulation results demonstrate the effectiveness of the proposed method. © 2018, Electromagnetics Academy. All rights reserved.
引用
收藏
页码：79 / 87
页数：8
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