Bode Diagram

clear;
syms s;

Rl = 20;
Xc = 1/(s*(10*10^-9));
Xl = s*10^-3;
R = 40;

H = R/(Rl + Xc + Xl + R);

[N, D] = numden(H);

NN =[40000, 0] ;

DD = [1,60000, 100000000000];

tf;
sys = tf(NN, DD);
bode(NN,DD);
grid on;