The axial ratio as a function of angle in xz- and yz-planes
is shown in Fig.10(a) and Fig.10 (b), respectively. We have
changed the frequency at 913, 917, 921 and 925 MHz. It can
be seen that the axial ratio is slightly different for various
frequencies. When comparing among the different angles, it is
found that the angle of zero degree yields the minimum axial
ratio.