New Stochastic Algorithm for Optimization of Both Side Lobes and Grating Lobes in Large Antenna Arrays for MPT
New Stochastic Algorithm for Optimization of Both Side Lobes and Grating Lobes in Large Antenna Arrays for MPT
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DOI：
10.1093/ietcom/e91-b.1.286
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
N. Shinohara;B. Shishkov;H. Matsumoto;K. Hashimoto;A. Baki
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文献类型：
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作者：
N. Shinohara;B. Shishkov;H. Matsumoto;K. Hashimoto;A. Baki
在太空中放置巨大的太阳能卫星（SPS）系统的概念代表了为数不多的新技术选择之一，可以为地面市场提供大规模、环境清洁的基本负荷电力。近年来空间探索的发展对高分辨率、高增益和低旁瓣电平的天线提出了巨大的需求。最后一个特性对于微波功率传输（MPT）来说是至关重要的，以实现更高的发射效率（TE）和更高的光束收集效率（BCE）。为了实现低旁瓣电平，统计方法起着重要的作用。本文研究了具有随机、均匀和组合单元间距的大型天线阵列的各种有趣特性，特别是从一种角度研究了所需单元数及其适当间距与另一种角度研究了所需的SLL、孔径尺寸、波束宽度和TE之间的关系。我们提出了一种新的统一方法，通过利用所提出算法的确定性和随机工作空间的相互作用来搜索减少SLL。我们的模型显示了主波束周围大面积的副瓣电平，并在整个可见范围内强烈地降低了SLL。提出了一种设计大型天线阵系统的新概念。我们的理论研究和仿真结果阐明了在设计大型天线阵列时如何处理侧瓣问题，这似乎是未来SPS/MPT系统实现的重要一步。
The concept of placing enormous Solar Power Satellite (SPS) systems in space represents one of a handful of new technological options that might provide large scale, environmentally clean base load power to terrestrial markets. Recent advances in space exploration have shown a great need for antennas with high resolution, high gain and low side lobe level (SLL). The last characteristic is of paramount importance especially for the Microwave Power Transmission (MPT) in order to achieve higher transmitting efficiency (TE) and higher beam collection efficiency (BCE). In order to achieve low side lobe levels, statistical methods play an important role. Various interesting properties of a large antenna arrays with randomly, uniformly and combined spacing of elements have been studied, especially the relationship between the required number of elements and their appropriate spacing from one viewpoint and the desired SLL, the aperture dimension, the beamwidth and TE from the other. We propose a new unified approach in searching for reducing SLL by exploiting the interaction of deterministic and stochastic workspaces of proposed algorithms. Our models indicate the side lobe levels in a large area around the main beam and strongly reduce SLL in the entire visible range. A new concept of designing a large antenna array system is proposed. Our theoretic study and simulation results clarify how to deal with the problems of side lobes in designing a large antenna array, which seems to be an important step toward the realization of future SPS/MPT systems.