include_write_frequency_response.F90
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!
! This file is part of SACAMOS, State of the Art CAble MOdels for Spice.
! It was developed by the University of Nottingham and the Netherlands Aerospace
! Centre (NLR) for ESA under contract number 4000112765/14/NL/HK.
!
! Copyright (C) 2016-2018 University of Nottingham
!
! SACAMOS 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.
!
! SACAMOS 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.
!
! A copy of the GNU General Public License version 3 can be found in the
! file GNU_GPL_v3 in the root or at <http://www.gnu.org/licenses/>.
!
! SACAMOS uses the EISPACK library (in /SRC/EISPACK). EISPACK is subject to
! the GNU Lesser General Public License. A copy of the GNU Lesser General Public
! License version can be found in the file GNU_LGPL in the root of EISPACK
! (/SRC/EISPACK ) or at <http://www.gnu.org/licenses/>.
!
! The University of Nottingham can be contacted at: ggiemr@nottingham.ac.uk
!
!
!
! Description
! This is a fortran fragment which is included in network_synthesis.F90
! It is used for testing that the equivalent circuit model reproduces the
! required transfer function.
!
! Comments:
! Note that this doesn't include the Brune sub-circuit.
!
! History
!
! 16/11/2017 CJS Include network synthesis process to replace s-domain transfer functions
!
!
! evaluate the frequency response of the continued fraction function
open(unit=30,file='Continued_fraction.fout')
wstep=(wmax-wmin)/(nw-1)
do i=1,nw
s=(0d0,1d0)*(wmin+wstep*(i-1))
last_CF_term=(0d0,0d0)
last_type=CFtype(n_branches)
do loop=n_branches,1,-1 ! note evaluate the continued fraction from the bottom up
R=CFterm(loop,1)
L=CFterm(loop,2)
C=CFterm(loop,3)
type=CFtype(loop)
if (type.EQ.series_RLC) then
CF_term=s*L/(s*s*L*C+s*L/R+1D0)
else if (type.EQ.series_LC) then
CF_term=s*L/(s*s*L*C+1d0)
else if (type.EQ.series_RC) then
CF_term=R/(s*C*R+1d0)
else if (type.EQ.series_RL) then
CF_term=s*L/(s*L/R+1D0)
else if (type.EQ.series_C) then
CF_term=1d0/(s*C)
else if (type.EQ.series_L) then
CF_term=s*L
else if (type.EQ.series_R) then
CF_term=R
! admittance terms
else if (type.EQ.shunt_RLC) then
CF_term=s*C/(s*s*L*C+s*R*C+1D0)
else if (type.EQ.shunt_LC) then
CF_term=s*C/(s*s*L*C+1D0)
else if (type.EQ.shunt_RC) then
CF_term=s*C/(s*C*R+1D0)
else if (type.EQ.shunt_RL) then
CF_term=1d0/(s*L+R)
else if (type.EQ.shunt_C) then
CF_term=(s*C)
else if (type.EQ.shunt_L) then
CF_term=1d0/(s*L)
else if (type.EQ.shunt_R) then
CF_term=1d0/R
end if
if (loop.NE.max_order) then
if (last_type*type.LT.0) then
! we switch from impedance to admittance or vice versa in the network
CF_term=CF_term+1d0/last_CF_term
else
CF_term=CF_term+last_CF_term
end if
end if
last_CF_term=CF_term
last_type=type
end do
if (last_type.GT.0d0) then
H_CF=last_CF_term
else
H_CF=1d0/last_CF_term
end if
write(30,8030)(wmin+wstep*(i-1))/6.28318530718,real(H_CF),aimag(H_CF)
8030 format(3ES16.6)
end do
close(unit=30)