/*! was SOMNEC in the original NEC-2 source code
*/
void c_ggrid::sommerfeld(nec_float epr, nec_float sig, nec_float wavelength) {
static nec_complex const1_neg = -nec_complex(0.0, 4.771341189);
static nec_complex CONST4(0.0, em::impedance() / 2.0);
nec_float dr, dth, r, rk, thet, tfac1, tfac2;
nec_complex erv, ezv, erh, eph, cl1, cl2, con;
if (sig >= 0.0) {
m_epscf = nec_complex(epr,
-sig * wavelength * em::impedance_over_2pi());
}
else {
m_epscf = nec_complex(epr, sig);
}
m_evlcom.m_ck2 = two_pi();
m_evlcom.m_ck2sq = m_evlcom.m_ck2 * m_evlcom.m_ck2;
/*
Sommerfeld integral evaluation uses exp(-jwt), NEC uses exp(+jwt),
hence need conjg(epscf). Conjugate of fields occurs in subroutine
evlua. */
m_evlcom.m_ck1sq = m_evlcom.m_ck2sq * conj(m_epscf);
m_evlcom.m_ck1 = sqrt(m_evlcom.m_ck1sq);
m_evlcom.m_ck1r = real(m_evlcom.m_ck1);
m_evlcom.m_tkmag = 100.0 * abs(m_evlcom.m_ck1);
m_evlcom.m_tsmag = 100.0 * norm(m_evlcom.m_ck1);
// TCAM changed from previous line
m_evlcom.m_cksm = m_evlcom.m_ck2sq / (m_evlcom.m_ck1sq + m_evlcom.m_ck2sq);
m_evlcom.m_ct1 = 0.5 * (m_evlcom.m_ck1sq - m_evlcom.m_ck2sq);
erv = m_evlcom.m_ck1sq * m_evlcom.m_ck1sq;
ezv = m_evlcom.m_ck2sq * m_evlcom.m_ck2sq;
m_evlcom.m_ct2 = 0.125 * (erv - ezv);
erv *= m_evlcom.m_ck1sq;
ezv *= m_evlcom.m_ck2sq;
m_evlcom.m_ct3 = 0.0625 * (erv - ezv);
unsigned int loopkstart = GetTickCount();
unsigned int looptstart, looptend, looprstart, looprend;
/*loop over 3 grid regions*/
for (int k = 0; k < 3; k++) {
int nr = m_nxa[k];
int nth = m_nya[k];
dr = m_dxa[k];
dth = m_dya[k];
r = m_xsa[k] - dr;
int irs = 1;
if (k == 0) {
r = m_xsa[k];
irs = 2;
}
looprstart = GetTickCount();
/*loop over r. (r=sqrt(m_evlcom.m_rho**2 + (z+h)**2))*/
/*TODO :
Is the pattern here always 11,17,9
Does it always contain the same numbers?*/
for (int ir = irs - 1; ir < nr; ir++) {
r += dr;
thet = m_ysa[k] - dth;
looptstart = GetTickCount();
/*loop over theta. (theta=atan((z+h)/m_evlcom.m_rho))*/
for (int ith = 0; ith < nth; ith++) {
thet += dth;
m_evlcom.m_rho = r * cos(thet);
m_evlcom.m_zph = r * sin(thet);
if (m_evlcom.m_rho < 1.e-7)
m_evlcom.m_rho = 1.e-8;
if (m_evlcom.m_zph < 1.e-7)
m_evlcom.m_zph = 0.;
m_evlcom.evlua(&erv, &ezv, &erh, &eph);
rk = m_evlcom.m_ck2 * r;
con = const1_neg * r / nec_complex(cos(rk), -sin(rk));
switch (k) {
case 0:
m_ar1[ir + ith * 11 + 0] = erv * con;
m_ar1[ir + ith * 11 + 110] = ezv * con;
m_ar1[ir + ith * 11 + 220] = erh * con;
m_ar1[ir + ith * 11 + 330] = eph * con;
break;
case 1:
m_ar2[ir + ith * 17 + 0] = erv * con;
m_ar2[ir + ith * 17 + 85] = ezv * con;
m_ar2[ir + ith * 17 + 170] = erh * con;
m_ar2[ir + ith * 17 + 255] = eph * con;
break;
case 2:
m_ar3[ir + ith * 9 + 0] = erv * con;
m_ar3[ir + ith * 9 + 72] = ezv * con;
m_ar3[ir + ith * 9 + 144] = erh * con;
m_ar3[ir + ith * 9 + 216] = eph * con;
}/*switch( k )*/
}/*for ( ith = 0; ith < nth; ith++ )*/
looptend = GetTickCount();
}/*for ( ir = irs-1; ir < nr; ir++; )*/
looprend = GetTickCount();
}/*for ( k = 0; k < 3; k++; )*/
unsigned int loopkend = GetTickCount();
unsigned int loopttime = looptend - looptstart;
unsigned int looprtime = looprend - looprstart;
unsigned int loopktime = loopkend - loopkstart;
/*TODO : working here on improving loop timing*/
/*fill grid 1 for r equal to zero. */
cl2 = -CONST4 * (m_epscf - 1.) / (m_epscf + 1.);
cl1 = cl2 / (m_epscf + 1.);
ezv = m_epscf * cl1;
thet = -dth;
int nth = m_nya[0];
for (int ith = 0; ith < nth; ith++) {
thet += dth;
if ((ith + 1) != nth) {
tfac2 = cos(thet);
tfac1 = (1. - sin(thet)) / tfac2;
tfac2 = tfac1 / tfac2;
erv = m_epscf * cl1 * tfac1;
erh = cl1 * (tfac2 - 1.) + cl2;
eph = cl1 * tfac2 - cl2;
}
else {
erv = 0.;
erh = cl2 - .5 * cl1;
eph = -erh;
}
m_ar1[0 + ith * 11 + 0] = erv;
m_ar1[0 + ith * 11 + 110] = ezv;
m_ar1[0 + ith * 11 + 220] = erh;
m_ar1[0 + ith * 11 + 330] = eph;
}
}
void c_network::net_solve( complex_array& cm, nec_complex *cmb,
nec_complex *cmc, nec_complex *cmd, int_array& ip,
complex_array& einc )
{
/* Network buffers */
int_array ipnt, nteqa, ntsca;
complex_array vsrc, rhs, cmn, rhnt, rhnx;
bool jump1, jump2;
int nteq=0, ntsc=0, nseg2, irow2=0;
int neqz2, neqt, irow1=0, i, nseg1, isc1=0, isc2=0;
nec_float asmx, asa, y11r, y11i, y12r, y12i, y22r, y22i;
nec_complex ymit, vlt, cux;
neqz2= neq2;
if ( neqz2 == 0)
neqz2=1;
input_power = 0.0;
network_power_loss = 0.0;
neqt= neq+ neq2;
int ndimn = (2*network_count + voltage_source_count);
/* Allocate network buffers */
if ( network_count > 0 )
{
rhs.resize( geometry.n_plus_3m ); // this should probably be ndimn!
rhnt.resize( ndimn );
rhnx.resize( ndimn);
cmn.resize( ndimn * ndimn );
ntsca.resize( ndimn );
nteqa.resize( ndimn );
ipnt.resize( ndimn );
vsrc.resize( voltage_source_count );
}
if ( ntsol == 0)
{
/* compute relative matrix asymmetry */
if ( masym != 0)
{
irow1=0;
for( i = 0; i < network_count; i++ )
{
nseg1= iseg1[i];
for( isc1 = 0; isc1 < 2; isc1++ )
{
if ( irow1 == 0)
{
ipnt[irow1]= nseg1;
nseg1= iseg2[i];
irow1++;
continue;
}
int j = 0;
for( j = 0; j < irow1; j++ )
if ( nseg1 == ipnt[j])
break;
if ( j == irow1 )
{
ipnt[irow1]= nseg1;
irow1++;
}
nseg1= iseg2[i];
} /* for( isc1 = 0; isc1 < 2; isc1++ ) */
} /* for( i = 0; i < network_count; i++ ) */
ASSERT(voltage_source_count >= 0);
for( i = 0; i < voltage_source_count; i++ )
{
nseg1= source_segment_array[i];
if ( irow1 == 0)
{
ipnt[irow1]= nseg1;
irow1++;
continue;
}
int j = 0;
for( j = 0; j < irow1; j++ )
if ( nseg1 == ipnt[j])
break;
if ( j == irow1 )
{
ipnt[irow1]= nseg1;
irow1++;
}
} /* for( i = 0; i < voltage_source_count; i++ ) */
if ( irow1 >= 2)
{
for( i = 0; i < irow1; i++ )
{
isc1 = ipnt[i]-1;
asmx= geometry.segment_length[isc1];
for (int j = 0; j < neqt; j++ )
rhs[j] = cplx_00();
rhs[isc1] = cplx_10();
solves( cm, ip, rhs, neq, 1, geometry.np, geometry.n, geometry.mp, geometry.m, nop, symmetry_array);
geometry.get_current_coefficients(wavelength, rhs, air, aii, bir, bii, cir, cii, vqds, nqds, iqds);
for (int j = 0; j < irow1; j++ )
{
isc1= ipnt[j]-1;
cmn[j+i*ndimn]= rhs[isc1]/ asmx;
}
} /* for( i = 0; i < irow1; i++ ) */
asmx=0.0;
asa=0.0;
for( i = 1; i < irow1; i++ )
{
for (int j = 0; j < i; j++ )
{
cux = cmn[i+j*ndimn];
nec_float pwr= abs(( cux- cmn[j+i*ndimn])/ cux);
asa += pwr* pwr;
if ( pwr >= asmx)
{
asmx= pwr;
nteq= ipnt[i];
ntsc= ipnt[j];
}
} /* for( j = 0; j < i; j++ ) */
} /* for( i = 1; i < irow1; i++ ) */
asa= sqrt( asa*2./ (nec_float)( irow1*( irow1-1)));
fprintf( output_fp, "\n\n"
" MAXIMUM RELATIVE ASYMMETRY OF THE DRIVING POINT ADMITTANCE\n"
" MATRIX IS %10.3E FOR SEGMENTS %d AND %d\n"
" RMS RELATIVE ASYMMETRY IS %10.3E",
asmx, nteq, ntsc, asa );
} /* if ( irow1 >= 2) */
} /* if ( masym != 0) */
/* solution of network equations */
if ( network_count != 0)
{
// zero the cmn array, and the rhnx array
cmn.fill(cplx_00());
rhnx.fill(cplx_00());
/* for( i = 0; i < ndimn; i++ )
{
rhnx[i]=cplx_00();
for (int j = 0; j < ndimn; j++ )
cmn[j+i*ndimn]=cplx_00();
}
*/
nteq=0;
ntsc=0;
/* sort network and source data and
assign equation numbers to segments */
for (int j = 0; j < network_count; j++ )
{
nseg1= iseg1[j];
nseg2= iseg2[j];
if ( ntyp[j] <= 1)
{
y11r= x11r[j];
y11i= x11i[j];
y12r= x12r[j];
y12i= x12i[j];
y22r= x22r[j];
y22i= x22i[j];
}
else
{
y22r= two_pi() * x11i[j]/ wavelength;
y12r=0.;
y12i=1./( x11r[j]* sin( y22r));
y11r= x12r[j];
y11i=- y12i* cos( y22r);
y22r= x22r[j];
y22i= y11i+ x22i[j];
y11i= y11i+ x12i[j];
if ( ntyp[j] != 2)
{
y12r=- y12r;
y12i=- y12i;
}
} /* if ( ntyp[j] <= 1) */
jump1 = false;
for( i = 0; i < voltage_source_count; i++ )
{
if ( nseg1 == source_segment_array[i])
{
isc1 = i;
jump1 = true;
break;
}
}
jump2 = false;
if ( ! jump1 )
{
isc1=-1;
for( i = 0; i < nteq; i++ )
{
if ( nseg1 == nteqa[i])
{
irow1 = i;
jump2 = true;
break;
}
}
if ( ! jump2 )
{
irow1= nteq;
nteqa[nteq]= nseg1;
nteq++;
}
} /* if ( ! jump1 ) */
else
{
for( i = 0; i < ntsc; i++ )
{
if ( nseg1 == ntsca[i])
{
irow1 = ndimn- (i+1);
jump2 = true;
break;
}
}
if ( ! jump2 )
{
irow1= ndimn- (ntsc+1);
ntsca[ntsc]= nseg1;
vsrc[ntsc]= source_voltage_array[isc1];
ntsc++;
}
} /* if ( ! jump1 ) */
jump1 = false;
for( i = 0; i < voltage_source_count; i++ )
{
if ( nseg2 == source_segment_array[i])
{
isc2= i;
jump1 = true;
break;
}
}
jump2 = false;
if ( ! jump1 )
{
isc2=-1;
for( i = 0; i < nteq; i++ )
{
if ( nseg2 == nteqa[i])
{
irow2= i;
jump2 = true;
break;
}
}
if ( ! jump2 )
{
irow2= nteq;
nteqa[nteq]= nseg2;
nteq++;
}
} /* if ( ! jump1 ) */
else
{
for( i = 0; i < ntsc; i++ )
{
if ( nseg2 == ntsca[i])
{
irow2 = ndimn- (i+1);
jump2 = true;
break;
}
}
if ( ! jump2 )
{
irow2= ndimn- (ntsc+1);
ntsca[ntsc]= nseg2;
vsrc[ntsc]= source_voltage_array[isc2];
ntsc++;
}
} /* if ( ! jump1 ) */
/* fill network equation matrix and right hand side vector with */
/* network short-circuit admittance matrix coefficients. */
if ( isc1 == -1)
{
cmn[irow1+irow1*ndimn] -= nec_complex( y11r, y11i)* geometry.segment_length[nseg1-1];
cmn[irow1+irow2*ndimn] -= nec_complex( y12r, y12i)* geometry.segment_length[nseg1-1];
}
else
{
rhnx[irow1] += nec_complex( y11r, y11i)* source_voltage_array[isc1]/wavelength;
rhnx[irow2] += nec_complex( y12r, y12i)* source_voltage_array[isc1]/wavelength;
}
if ( isc2 == -1)
{
cmn[irow2+irow2*ndimn] -= nec_complex( y22r, y22i)* geometry.segment_length[nseg2-1];
cmn[irow2+irow1*ndimn] -= nec_complex( y12r, y12i)* geometry.segment_length[nseg2-1];
}
else
{
rhnx[irow1] += nec_complex( y12r, y12i)* source_voltage_array[isc2]/wavelength;
rhnx[irow2] += nec_complex( y22r, y22i)* source_voltage_array[isc2]/wavelength;
}
} /* for( j = 0; j < network_count; j++ ) */
/* add interaction matrix admittance
elements to network equation matrix */
for( i = 0; i < nteq; i++ )
{
for (int j = 0; j < neqt; j++ )
rhs[j] = cplx_00();
irow1= nteqa[i]-1;
rhs[irow1]=cplx_10();
solves( cm, ip, rhs, neq, 1, geometry.np, geometry.n, geometry.mp, geometry.m, nop, symmetry_array);
geometry.get_current_coefficients(wavelength, rhs, air, aii, bir, bii, cir, cii, vqds, nqds, iqds);
for (int j = 0; j < nteq; j++ )
{
irow1= nteqa[j]-1;
cmn[i+j*ndimn] += rhs[irow1];
}
} /* for( i = 0; i < nteq; i++ ) */
/* factor network equation matrix */
lu_decompose( nteq, cmn, ipnt, ndimn);
} /* if ( network_count != 0) */
} /* if ( ntsol != 0) */
if (0 == network_count)
{
/* solve for currents when no networks are present */
solves( cm, ip, einc, neq, 1, geometry.np, geometry.n, geometry.mp, geometry.m, nop, symmetry_array);
geometry.get_current_coefficients(wavelength, einc, air, aii, bir, bii, cir, cii, vqds, nqds, iqds);
ntsc=0;
}
else // if ( network_count != 0)
{
/* add to network equation right hand side */
/* the terms due to element interactions */
for( i = 0; i < neqt; i++ )
rhs[i]= einc[i];
solves( cm, ip, rhs, neq, 1, geometry.np, geometry.n, geometry.mp, geometry.m, nop, symmetry_array);
geometry.get_current_coefficients(wavelength, rhs, air, aii, bir, bii, cir, cii, vqds, nqds, iqds);
for( i = 0; i < nteq; i++ )
{
irow1= nteqa[i]-1;
rhnt[i]= rhnx[i]+ rhs[irow1];
}
/* solve network equations */
solve( nteq, cmn, ipnt, rhnt, ndimn);
/* add fields due to network voltages to electric fields */
/* applied to structure and solve for induced current */
for( i = 0; i < nteq; i++ )
{
irow1= nteqa[i]-1;
einc[irow1] -= rhnt[i];
}
solves( cm, ip, einc, neq, 1, geometry.np, geometry.n, geometry.mp, geometry.m, nop, symmetry_array);
geometry.get_current_coefficients(wavelength, einc, air, aii, bir, bii, cir, cii, vqds, nqds, iqds);
if ( nprint == 0)
{
fprintf( output_fp, "\n\n\n"
" "
"--------- STRUCTURE EXCITATION DATA AT NETWORK CONNECTION POINTS --------" );
fprintf( output_fp, "\n"
" TAG SEG VOLTAGE (VOLTS) CURRENT (AMPS) "
" IMPEDANCE (OHMS) ADMITTANCE (MHOS) POWER\n"
" No: No: REAL IMAGINARY REAL IMAGINARY "
" REAL IMAGINARY REAL IMAGINARY (WATTS)" );
}
for( i = 0; i < nteq; i++ )
{
int segment_number = nteqa[i];
int segment_index = segment_number-1;
nec_complex voltage = rhnt[i]* geometry.segment_length[segment_index]* wavelength;
nec_complex current = einc[segment_index]* wavelength;
nec_complex admittance = current / voltage;
nec_complex impedance = voltage / current;
int segment_tag = geometry.segment_tags[irow1];
nec_float power = em::power(voltage,current);
network_power_loss= network_power_loss - power;
if ( nprint == 0)
fprintf( output_fp, "\n"
" %4d %5d %11.4E %11.4E %11.4E %11.4E"
" %11.4E %11.4E %11.4E %11.4E %11.4E",
segment_tag, segment_number, real(voltage), imag(voltage), real(current), imag(current),
real(impedance), imag(impedance), real(admittance), imag(admittance), power );
}
for( i = 0; i < ntsc; i++ )
{
irow1= ntsca[i]-1;
vlt= vsrc[i];
cux= einc[irow1]* wavelength;
ymit= cux/ vlt;
zped= vlt/ cux;
irow2= geometry.segment_tags[irow1];
nec_float pwr= em::power(vlt,cux);
network_power_loss= network_power_loss- pwr;
if ( nprint == 0)
fprintf( output_fp, "\n"
" %4d %5d %11.4E %11.4E %11.4E %11.4E"
" %11.4E %11.4E %11.4E %11.4E %11.4E",
irow2, irow1+1, real(vlt), imag(vlt), real(cux), imag(cux),
real(zped), imag(zped), real(ymit), imag(ymit), pwr );
} /* for( i = 0; i < ntsc; i++ ) */
} /* if ( network_count != 0) */
if ( (voltage_source_count+nvqd) == 0)
return;
nec_antenna_input* antenna_input = new nec_antenna_input();
s_results.add(antenna_input);
s_output.end_section();
fprintf( output_fp,
" "
"--------- ANTENNA INPUT PARAMETERS ---------" );
fprintf( output_fp, "\n"
" TAG SEG VOLTAGE (VOLTS) "
"CURRENT (AMPS) IMPEDANCE (OHMS) "
" ADMITTANCE (MHOS) POWER\n"
" NO. NO. REAL IMAGINARY"
" REAL IMAGINARY REAL "
"IMAGINARY REAL IMAGINARY (WATTS)" );
for( i = 0; i < voltage_source_count; i++ )
{
int segment_index = source_segment_array[i]-1;
nec_complex voltage = source_voltage_array[i];
nec_complex current = einc[segment_index] * wavelength;
bool add_as_network_loss = false;
// the following loop is completely mysterious!
for (int j = 0; j < ntsc; j++ )
{
// I am now almost sure that the following code is not correct.
// This modifies the current, however if the inner loop is executed more
// than once, then only the last current modification is kept!
if ( ntsca[j] == segment_index+1)
{
int row_index = ndimn - (j+1);
int row_offset = row_index*ndimn;
// I wish I knew what was going on here...
nec_complex temp = rhnx[row_index]; // renamed current -> temp to avoid confusion
for (int k = 0; k < nteq; k++ )
temp -= cmn[k + row_offset]*rhnt[k];
current = (temp + einc[segment_index])* wavelength;
add_as_network_loss = true;
#warning "This loop is messed up. The j is inside another j loop"
// I have removed the j from the "for (int k = 0; k < nteq; k++ )" loop
// and placed this"j=nteq" statement here.
j = nteq;
}
}
nec_complex admittance = current / voltage;
nec_complex impedance = voltage / current;
nec_float power = em::power(voltage,current);
if ( add_as_network_loss )
network_power_loss += power;
input_power += power;
int segment_tag = geometry.segment_tags[segment_index];
antenna_input->set_input(
segment_tag, segment_index+1,
voltage, current, impedance, admittance, power);
fprintf( output_fp, "\n"
" %4d %5d %11.4E %11.4E %11.4E %11.4E"
" %11.4E %11.4E %11.4E %11.4E %11.4E",
segment_tag, segment_index+1, real(voltage), imag(voltage), real(current), imag(current),
real(impedance), imag(impedance), real(admittance), imag(admittance), power );
} /* for( i = 0; i < voltage_source_count; i++ ) */
for( i = 0; i < nvqd; i++ )
{
int segment_index = ivqd[i]-1;
nec_complex voltage = vqd[i];
nec_complex _ai( air[segment_index], aii[segment_index]);
nec_complex _bi( bir[segment_index], bii[segment_index]);
nec_complex _ci( cir[segment_index], cii[segment_index]);
// segment length is measured in wavelengths. The pase is therefore the length in wavelengths
// multiplied by pi().
nec_float segment_length_phase = geometry.segment_length[segment_index] * pi(); // TCAM CHANGED TO pi() (from TP*.5)!!
nec_complex current = ( _ai - _bi* sin(segment_length_phase)+ _ci * cos(segment_length_phase)) * wavelength;
nec_complex admittance = current / voltage;
nec_complex impedance = voltage / current;
nec_float power = em::power(voltage,current);
input_power += power;
int segment_tag = geometry.segment_tags[segment_index];
antenna_input->set_input(
segment_tag, segment_index+1,
voltage, current, impedance, admittance, power);
fprintf( output_fp, "\n"
" %4d %5d %11.4E %11.4E %11.4E %11.4E"
" %11.4E %11.4E %11.4E %11.4E %11.4E",
segment_tag, segment_index+1, real(voltage), imag(voltage), real(current), imag(current),
real(impedance), imag(impedance), real(admittance), imag(admittance), power );
} /* for( i = 0; i < nvqd; i++ ) */
}
void c_ggrid::sommerfeld( nec_float epr, nec_float sig, nec_float freq_mhz )
{
static nec_complex const1_neg = - nec_complex(0.0,4.771341189);
int nth, irs, nr;
nec_float tim, wavelength, tst, dr, dth, r, rk, thet, tfac1, tfac2;
nec_complex erv, ezv, erh, eph, cl1, cl2, con;
if(sig >= 0.0)
{
wavelength=CVEL/freq_mhz;
m_epscf=nec_complex(epr,-sig*wavelength*59.96);
}
else
m_epscf=nec_complex(epr,sig);
secnds(&tst);
m_evlcom.m_ck2=two_pi();
m_evlcom.m_ck2sq=m_evlcom.m_ck2*m_evlcom.m_ck2;
/* sommerfeld integral evaluation uses exp(-jwt), nec uses exp(+jwt), */
/* hence need conjg(epscf). conjugate of fields occurs in subroutine */
/* evlua. */
m_evlcom.m_ck1sq=m_evlcom.m_ck2sq*conj(m_epscf);
m_evlcom.m_ck1=sqrt(m_evlcom.m_ck1sq);
m_evlcom.m_ck1r=real(m_evlcom.m_ck1);
m_evlcom.m_tkmag=100.0*abs(m_evlcom.m_ck1);
// m_evlcom.m_tsmag=100.0*abs(m_evlcom.m_ck1*conj(m_evlcom.m_ck1)); // TCAM added abs()
m_evlcom.m_tsmag=100.0*norm(m_evlcom.m_ck1); // TCAM changed from previous line
m_evlcom.m_cksm=m_evlcom.m_ck2sq/(m_evlcom.m_ck1sq+m_evlcom.m_ck2sq);
m_evlcom.m_ct1=.5*(m_evlcom.m_ck1sq-m_evlcom.m_ck2sq);
erv=m_evlcom.m_ck1sq*m_evlcom.m_ck1sq;
ezv=m_evlcom.m_ck2sq*m_evlcom.m_ck2sq;
m_evlcom.m_ct2=.125*(erv-ezv);
erv *= m_evlcom.m_ck1sq;
ezv *= m_evlcom.m_ck2sq;
m_evlcom.m_ct3=.0625*(erv-ezv);
/* loop over 3 grid regions */
for (int k = 0; k < 3; k++ )
{
nr = m_nxa[k];
nth = m_nya[k];
dr = m_dxa[k];
dth = m_dya[k];
r = m_xsa[k]-dr;
irs=1;
if(k == 0)
{
r=m_xsa[k];
irs=2;
}
/* loop over r. (r=sqrt(m_evlcom.m_rho**2 + (z+h)**2)) */
for (int ir = irs-1; ir < nr; ir++ )
{
r += dr;
thet = m_ysa[k]-dth;
/* loop over theta. (theta=atan((z+h)/m_evlcom.m_rho)) */
for (int ith = 0; ith < nth; ith++ )
{
thet += dth;
m_evlcom.m_rho=r*cos(thet);
m_evlcom.m_zph=r*sin(thet);
if(m_evlcom.m_rho < 1.e-7)
m_evlcom.m_rho=1.e-8;
if(m_evlcom.m_zph < 1.e-7)
m_evlcom.m_zph=0.;
m_evlcom.evlua( &erv, &ezv, &erh, &eph );
rk=m_evlcom.m_ck2*r;
con=const1_neg*r/nec_complex(cos(rk),-sin(rk));
switch( k )
{
case 0:
m_ar1[ir+ith*11+ 0]=erv*con;
m_ar1[ir+ith*11+110]=ezv*con;
m_ar1[ir+ith*11+220]=erh*con;
m_ar1[ir+ith*11+330]=eph*con;
break;
case 1:
m_ar2[ir+ith*17+ 0]=erv*con;
m_ar2[ir+ith*17+ 85]=ezv*con;
m_ar2[ir+ith*17+170]=erh*con;
m_ar2[ir+ith*17+255]=eph*con;
break;
case 2:
m_ar3[ir+ith*9+ 0]=erv*con;
m_ar3[ir+ith*9+ 72]=ezv*con;
m_ar3[ir+ith*9+144]=erh*con;
m_ar3[ir+ith*9+216]=eph*con;
} /* switch( k ) */
} /* for ( ith = 0; ith < nth; ith++ ) */
} /* for ( ir = irs-1; ir < nr; ir++; ) */
} /* for ( k = 0; k < 3; k++; ) */
/* fill grid 1 for r equal to zero. */
cl2 = -CONST4*(m_epscf-1.)/(m_epscf+1.);
cl1 = cl2/(m_epscf+1.);
ezv = m_epscf*cl1;
thet=-dth;
nth = m_nya[0];
for (int ith = 0; ith < nth; ith++ )
{
thet += dth;
if( (ith+1) != nth )
{
tfac2=cos(thet);
tfac1=(1.-sin(thet))/tfac2;
tfac2=tfac1/tfac2;
erv=m_epscf*cl1*tfac1;
erh=cl1*(tfac2-1.)+cl2;
eph=cl1*tfac2-cl2;
}
else
{
erv=0.;
erh=cl2-.5*cl1;
eph=-erh;
}
m_ar1[0+ith*11+ 0]=erv;
m_ar1[0+ith*11+110]=ezv;
m_ar1[0+ith*11+220]=erh;
m_ar1[0+ith*11+330]=eph;
}
secnds(&tim);
tim -= tst;
return;
}
nec_float em::impedance_over_2pi() // was (59.958 in old nec2)
{
nec_float ret = em::impedance() / two_pi();
return ret; // 59.958
}