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+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2015,20016 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import numpy as np
+
+C0 = 299792458 # m/s
+MUE0 = 4e-7*np.pi # N/A^2
+EPS0 = 1/(MUE0*C0**2) # F/m
+
+# free space wave impedance
+Z0 = np.sqrt(MUE0/EPS0) # Ohm