free space
» y1 = [ 2.569E-2 - 1.3606E-3i 8.6298E-03 + 2.6410E-03i 8.6298E-03 + 2.6410E-03i 2.8918E-03 + 7.9930E-03i]

y1 =

   0.0257 - 0.0014i   0.0086 + 0.0026i   0.0086 + 0.0026i   0.0029 + 0.0080i

perfect ground
» y2 = [2.5338E-02  + 1.2959E-03i 5.0705E-03 + 4.2582E-03i 5.0705E-03 + 4.2582E-03i -5.8451E-03 + 1.0042E-02i]

y2 =

   0.0253 + 0.0013i   0.0051 + 0.0043i   0.0051 + 0.0043i  -0.0058 + 0.0100i

real ground (Approximated)

» y3 = [2.5076E-02 + 5.7458E-05i 6.8633E-03 + 4.1588E-03i 6.8633E-03 + 4.1588E-03i -1.0446E-03 + 1.0328E-02i]

y3 =

   0.0251 + 0.0001i   0.0069 + 0.0042i   0.0069 + 0.0042i  -0.0010 + 0.0103i

» » a

a =

     1     2     3     4
     3     1     4     2
     2     4     1     3
     4     3     2     1

» yy1 = y1(a)

yy1 =

   0.0257 - 0.0014i   0.0086 + 0.0026i   0.0086 + 0.0026i   0.0029 + 0.0080i
   0.0086 + 0.0026i   0.0257 - 0.0014i   0.0029 + 0.0080i   0.0086 + 0.0026i
   0.0086 + 0.0026i   0.0029 + 0.0080i   0.0257 - 0.0014i   0.0086 + 0.0026i
   0.0029 + 0.0080i   0.0086 + 0.0026i   0.0086 + 0.0026i   0.0257 - 0.0014i

» yy2 = y2(a)

yy2 =

   0.0253 + 0.0013i   0.0051 + 0.0043i   0.0051 + 0.0043i  -0.0058 + 0.0100i
   0.0051 + 0.0043i   0.0253 + 0.0013i  -0.0058 + 0.0100i   0.0051 + 0.0043i
   0.0051 + 0.0043i  -0.0058 + 0.0100i   0.0253 + 0.0013i   0.0051 + 0.0043i
  -0.0058 + 0.0100i   0.0051 + 0.0043i   0.0051 + 0.0043i   0.0253 + 0.0013i

» yy3 = y3(a)

yy3 =

   0.0251 + 0.0001i   0.0069 + 0.0042i   0.0069 + 0.0042i  -0.0010 + 0.0103i
   0.0069 + 0.0042i   0.0251 + 0.0001i  -0.0010 + 0.0103i   0.0069 + 0.0042i
   0.0069 + 0.0042i  -0.0010 + 0.0103i   0.0251 + 0.0001i   0.0069 + 0.0042i
  -0.0010 + 0.0103i   0.0069 + 0.0042i   0.0069 + 0.0042i   0.0251 + 0.0001i


» zm1 = inv(yy1)

zm1 =

  45.6511 + 3.7773i -16.6623 + 1.2689i -16.6623 + 1.2689i   8.1076 -11.6260i
 -16.6623 + 1.2689i  45.6511 + 3.7773i   8.1076 -11.6260i -16.6623 + 1.2689i
 -16.6623 + 1.2689i   8.1076 -11.6260i  45.6511 + 3.7773i -16.6623 + 1.2689i
   8.1076 -11.6260i -16.6623 + 1.2689i -16.6623 + 1.2689i  45.6511 + 3.7773i

» zm2 = inv(yy2)

zm2 =

  45.1898 - 7.1242i -18.6796 + 3.4913i -18.6796 + 3.4913i  15.4599 -15.4627i
 -18.6796 + 3.4913i  45.1898 - 7.1242i  15.4599 -15.4627i -18.6796 + 3.4913i
 -18.6796 + 3.4913i  15.4599 -15.4627i  45.1898 - 7.1242i -18.6796 + 3.4913i
  15.4599 -15.4627i -18.6796 + 3.4913i -18.6796 + 3.4913i  45.1898 - 7.1242i

» zm3 = inv(yy3)

zm3 =

  45.2169 - 0.7947i -18.0048 + 2.0464i -18.0048 + 2.0464i  12.0592 -13.8322i
 -18.0048 + 2.0464i  45.2169 - 0.7947i  12.0592 -13.8322i -18.0048 + 2.0464i
 -18.0048 + 2.0464i  12.0592 -13.8322i  45.2169 - 0.7947i -18.0048 + 2.0464i
  12.0592 -13.8322i -18.0048 + 2.0464i -18.0048 + 2.0464i  45.2169 - 0.7947i

»