An antenna has a field pattern E ( ) =cos . cos 2 . The first null beam width of the antenna is:

An antenna has a field pattern E ( ) =cos . cos 2 . The first null be

1.	An antenna has a field pattern E ( ) =cos . cos 2 . The first null beam width of the antenna is:
A.	45<sup>0</sup>
B.	90<sup>0</sup>
C.	180<sup>0</sup>
D.	120<sup>0</sup>
Answer» C. 180<sup>0</sup>