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I have difficulties to calculate my angle bins. After doing a fft over N points over the antenna elements I get N bins. For getting the angle of each bin I do the following:

f_bin = (2*pi)/N*n (n from -N/2 to N/2-1) which equals 2*pi*(fc/c)*lambda/2*sin(theta) or equivalently pi*sin(theta)

so I get 2*N*n = sin(theta) or asin(2*N*n) = theta (in rad)

but this does not correspond to the right angles. Am I doing something wrong here?

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