New and improved method of beam forming with reduced Side Lobe Levels for microwave power transmission
New and improved method of beam forming with reduced Side Lobe Levels for microwave power transmission
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DOI：
10.1109/icece.2008.4769314
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
A. Baki;K. Hashimoto;N. Shinohara;T. Mitani;H. Matsumoto
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文献类型：
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作者：
A. Baki;K. Hashimoto;N. Shinohara;T. Mitani;H. Matsumoto
太阳能卫星(SPS)是满足未来巨大能源需求的一种选择，因为到2050年，地球将需要相当于目前商业电力3至5倍的可持续电力来源。SPS的关键目标之一是保持最高的波束效率(BE)，因为与通信卫星的微波不同，来自SPS的微波(MW)将被转换为公用事业功率。因此，SPS需要一个高效的微波功率传输(MPT)系统。SPS的另一个方面是将旁瓣电平(SLL)维持在尽可能低的水平，以减少对其他通信系统的干扰。如果提高MPT效率，可以降低SPS成本。相控阵天线边缘渐变是降低SLL、增加BE的一种方法，系统复杂。也可以用随机间隔的元素位置来获得最小的SLL，但它不能保证较高的BE，并且随机元素位置的确定也是一项困难的任务。从阵列激励的等腰梯形分布(ITD)和天线阵元位置不等的概念出发，通过仿真和实验研究了一种新的边缘渐变系统方法。这种方法被命名为不等单元间距(ITDU)pSILA的dasiaITD边缘锥化。将ITDU方法与高斯边缘渐变和简单ITD边缘渐变进行了比较。最大旁瓣电平(MSLL)最低，BE最高。
Solar power satellite (SPS) is one option for meeting the huge future energy demand as the Earth will require sustainable electricity sources equivalent to 3 to 5 times the commercial power presently produced by 2050. One of the critical goals of SPS is to maintain highest beam efficiency (BE) because the microwaves (MW) from SPS will be converted to utility power unlike the MW from communication satellites. Therefore the SPS will need a highly efficient microwave power transmission (MPT) system. Another aspect of SPS is to maintain side lobe levels (SLL) as minimum as possible to reduce interference to other communication systems. The SPS costs can be reduced if MPT efficiency is increased. Edge tapering of a phased array antenna, that requires a complicated system, is one way to decrease SLL and increase BE. It is also possible to achieve minimum SLL with randomly spaced element position but it does not guarantee higher BE and the determination of random element position is also a difficult task. A new method of edge tapering system from the concepts of isosceles trapezoidal distribution (ITD) of array excitation and unequal element position of antenna array was investigated both through the simulation and the experimentation. The method is named as dasiaITD edge tapering with unequal element spacing (ITDU)psila. ITDU method was compared with Gaussian edge tapering and simple ITD edge tapering. The lowest maximum side lobe level (MSLL) and the highest BE was achieved in newly derived ITDU technique.