荷兰代尔夫特理工大学Leo P. Ligthart教授讲座通知

讲座题目：稀疏阵列天线

时间：2016年4月12日（星期二）下午14：30

地点：新主楼F708

内容简介：

In modern radio and radar the antenna arrays play an important multi-function role with respect to angular pattern and frequency characteristics. Most literature exists on so called ‘dense’ arrays with equidistant spacing between the antenna elements in the order of half the wavelength. Mutual coupling between the elements and wide-angular scanning requirements give degradation in the dense array performance and cause many headache problems for generations of antenna engineers.

In so called ‘sparse’ arrays the mutual spacing is larger. For wide-angular scanning, individual transmit-receive modules are needed meaning that high gain dense antenna arrays with many elements are costly. Sparse arrays are interesting because they use ‘array thinning’ and have therefore a potential lower cost.

In order to maximize the array efficiency in sparse arrays, the transmit power per element should be equal with a threat of high side lobes near the main lobe and unwanted grating lobes. For avoiding grating lobes in sparse arrays the spacing between elements should be non-equidistant. The so obtained spatial distribution of elements leads to a spatial field distribution over the array. Special design of this spatial field distribution can benefit the lowering of side lobes near the main lobe.

The design of sparse arrays is the central theme of this tutorial, showing sparse array advantages and disadvantages in comparison with dense arrays.

Contents of the tutorial

1.  Introduction sparse arrays (summary general aspects and theory)

2.  Sparse array design and analysis

-          Main lobe, side lobe patterns

-          (Multi)-ring sparse array

-          Experiments

3.  Sparse array by thinning or interleaving

Leo P. Ligthart教授简历:

Leo P. Ligthart教授为荷兰代尔夫特理工大学 “微波传输、雷达与遥感”专业荣誉教授。Ligthart教授的研究涵盖了无线电传播、多功能天线、多参数雷达、雷达网络、次地表层遥感、地球大气电波传播等诸多领域，同时在卫星、手机通讯、微波传输等方面也有较多涉及。学术研究成果包括600多篇论文、4个专利、2部专著。Ligthart教授2001年当选为电气与电子工程师学会会士（IEEE Fellow）、2001年当选为国际电气工程师学会会士（IET Fellow），同时他还是俄罗斯运输科学院院士（Russian Academy of Transport）。Ligthart教授先后荣获Vederprijs-award、IEE-Blumlein-Brown-Willans Premium Award、IEEE-MIKON award等多个奖项。