global K, T, K0, KR

    end = math.pi * 2
    step = end / 50

    frequency = np.arange(0, end, step)
    W = list()

    for i in range(len(frequency)):
        W.append(KR*K0 / (1 + (frequency[i] *T0)))

    plt.figure(2)
    ax = plt.subplot(111, projection='polar', axisbg='#CCFFCC' )

    ax.set_rlim(6)
    ax.plot(frequency * (-1), W , 'g')
    ax.grid(True)