Write a computer program to calculate the radiation pattern of an N-element uniform linear array.Include the capability of plotting 2-d rectangular and polar patterns.

Using this program, perform the following calculation and plot patterns in, both rectangular and polar forms.

a) Plot the radiation pattern for N=10 elements, spaced d=/4 apart, for three different values of phase difference: =0, =-/4 and =/2. Comment on the result.

b) With corresponding to the Hansen-woodyard condition, calculate the radiation pattern and compare with the ordinary endfire array. Use the same array as

in part a

c) Investigate the 3-d characteristic of the array by placing it on each of the 3 axis, namely the x, y, and z-axis.plot the pattern in each case and discuss.

d) Investigate the occurrence of grating lobe as spacing varies and hence establish the condition to avoid these. Perform this analysis for each type of array, namely the broadside , the endfire and the phased array.