#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Thu Feb 28 11:00:18 2019

@author: oyvind
"""

import numpy as np
import matplotlib.pyplot as plt

def H13(f):
    w = 2 * np.pi * f
    
    return np.arctan(1/(w * 10**-4)) * 180 / np.pi


def H2(f):
    w = 2 * np.pi * f
    
    return np.arctan(w * 100*10**(-9) * 10**4) * 180 / np.pi

def H4(f):
    w = 2 * np.pi * f
    
    R = 99.76
    L = 100 * 10**(-3)
    
    t = L / R
    
    return np.arctan(w * t) * 180 / np.pi

frq = []
values = []
for i in range(1, 2*10**4):
    frq.append(i)
    value = H4(i)
    values.append(value)

plt.plot(frq, values)
plt.xscale('log')
plt.gca().xaxis.grid(True)