Graphics Programs Reference
In-Depth Information
MATLAB Program ÐCapped_WedgeTM.mÑ
The MATLAB program
"Capped_WedgeTM.m"
given in listing 11.12, along
with the following associated functions
"DielCappedWedgeTMFields_Ls.m"
,
ÐDielCappedWedgeTMFields_PW"
,
"polardb.m"
,
"dbesselj.m"
,
"dbesselh.m",
and
"dbessely.m"
given in the following listings, calculates and plots the far
field of a capped wedge in the presence of an electric line source field. The
near field distribution is also computed for both line source or plane wave exci-
tation. All near field components are computed and displayed, in separate win-
dows, using 3-D output format. The program is also capable of analyzing the
field variations due to the cap parameters. The user can execute this MATLAB
program from the MATLAB command window and manually change the input
parameters in the designated section in the program in order to perform the
desired analysis. Alternatively, the
"Capped_Wedge_GUI.m"
function along
with the
"Capped_Wedge_GUI.fig"
file can be used to simplify the data entry
procedure.
A sample of the data entry screen of the
"Capped_Wedge_GUI"
program is
shown in
Fig. 11.31
for the case of a line source exciting a sharp conducting
wedge. The corresponding far field pattern is shown in
Fig. 11.32
.
When keep-
ing all the parameters in Fig. 11.31 the same except that selecting a dielectric
or conducting cap, one obtains the far field patterns in
Figs. 11.33
and
11.34,
respectively. It is clear from these figures how the cap parameters affect the
direction of the maximum radiation of the line source in the presence of the
wedge. The distribution of the components of the fields in the near field for
these three cases (sharp edge, dielectric capped edge, and conducting capped
edge) is computed and shown in
Figs. 11.35
to 11.43. The near field distribu-
tion for an incident plane wave field on these three types of wedges is also
computed and shown in
Figs. 11.44
to 11.52. These near field distributions
clearly demonstrated the effect or cap parameters in altering the sharp edge sin-
gular behavior. To further illustrate this effect, the following set of figures
(Figs. (11.53) to (11.55)) presents the near field of the electric component of
plane wave incident on a half plane with a sharp edge, dielectric capped edge,
and conducting capped edge.
The user is encouraged to experiment with this program as there are many
parameters that can be altered to change the near and far field characteristic
due to the scattering from a wedge structure.
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