Achieving Spatial Multi-Point Focusing by Frequency Diversity Array

Abstract

This paper proposes a class of frequency diverse array (FDA) for achieving time-varying spatial focusing for multiple targets. On the basis of single-target focusing of FDA, sequential focus at the four points is achieved by controlling the time period. The effects of frequency offset on the range of focusing area are derived. Since FDA is narrowband in nature, the relative operating bandwidth is limited to be 10%. Under the limitation of the bandwidth, the sequential multi-target focusing in the far-field is achieved. To validate the proposed method, numerical examples of eight-element FDA are reported and discussed.

Beampattern Synthesis and Optimization for Frequency Diverse Arc Array Based on the Virtual Element

“…FDA has been receiving increasing attention due to its unique range and angular spatial focusing properties [11][12][13][14]. To optimize the FDA dot-shaped beampattern, rangeangle coupling in the FDA beampattern can be removed by using nonlinear array element spacing to break the periodicity of FDA [15] and by using a logarithmically increasing frequency offset [16].…”

Frequency Diversity Array for Near-Field Focusing

“…Wireless power transmission (WPT) technology can be divided into far-field focusing technology and near-field focusing technology. The development of far-field focusing technology is already quite mature [1]. Near-field focusing refers to the concentration of waves and the convergence of energy in the near-field range and there is very little research in this area.…”