Data Analysis: 1.Draw normalized directivity functions by using polar coordinates,and label the maximum direction and values on the drawing.Compare the difference. 2.(Optional)Try to make a simple part,and attach it to the antenna,to see what happens. 019 Data Analysis: 1．Draw normalized directivity functions by using polar coordinates, and label the maximum direction and values on the drawing. Compare the difference. 2．(Optional) Try to make a simple part, and attach it to the antenna, to see what happens