1 /* atlc - arbitrary transmission line calculator, for the analysis of
2 transmission lines are directional couplers.
4 Copyright (C) 2002. Dr. David Kirkby, PhD (G8WRB).
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License
8 as published by the Free Software Foundation; either package_version 2
9 of the License, or (at your option) any later package_version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 Dr. David Kirkby, e-mail drkirkby at gmail.com
27 #include "definitions.h"
29 /* The following function computes:
32 K is the complete elliptic integral of the first kind,
33 K' is the complementary complete elliptic integral of the first kind
35 This simple routine was given to my by Dan - it is one hell
36 of a lot simplier than the routine in the numerical recipes book
40 double K_over_Kdash(double k)
43 kp = sqrt(1.0-pow(k,2.0));
49 k = 2.0*sqrt(k)/(1.0+k);
50 kp = 2.0*sqrt(kp)/(1.0+kp);