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clear;
ka = 2 * 2 * pi;
N = 100;
phi = 0 : pi / 180 : 2 * pi;
nn = -N : N;
rcs = (-1) .^ nn .* besselj(nn, ka) ./ besselh(nn, ka) * exp(j * nn' * phi);
rcs = abs(rcs) .^ 2 .* 4 / (ka * pi);
figure('color', 'w');
plot(phi * 180 / pi, 10 * log10(rcs));

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