中文说明：
有关阵列天线的matlab仿真：
1、给出阵元的个数，阵元的间隔以及波长
2、计算方向图并绘制不同的方向图，有规律的排列
3、计算出主瓣宽度，3dB带宽，主瓣与第一旁瓣的幅度比（以dB作单位）
English Description：
Array antenna matlab simulation, 1, to the number troupe, interval, and the wavelength of the array element 2, calculate the pattern and draw a different pattern, a regular arrangement of 3, calculate the width of the main lobe, 3-dB bandwidth of the main lobe and the first side lobe amplitude ratio (in dB as a unit)