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Lindsey Heagy
17 lines
458 B
Python
17 lines
458 B
Python
import numpy as np
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from scipy.constants import mu_0, epsilon_0
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# useful params
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def omega(freq):
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"""Angular frequency, omega"""
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return 2.*np.pi*freq
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def k(freq, sigma, mu=mu_0, eps=epsilon_0):
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""" Eq 1.47 - 1.49 in Ward and Hohmann """
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w = omega(freq)
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alp = w * np.sqrt( mu*eps/2 * ( np.sqrt(1. + (sigma / (eps*w))**2 ) + 1) )
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beta = w * np.sqrt( mu*eps/2 * ( np.sqrt(1. + (sigma / (eps*w))**2 ) - 1) )
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return alp - 1j*beta
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