Graphics Programs Reference
In-Depth Information
where
I
n
represents the complex current distribution for the
nth
element.
When the array main beam is directed in the
(
θ
0
φ
0
,
)
, Eq. (8.65) takes on the
following form
N
∑
j
2π
a
λ
----------
θ
n
E
θφ
a
(
,
;
)
=
I
n
exp
[
sin
cos
(
φ
)
sin
θ
0
cos
(
Φ
n
φ
0
)
]
(8.66)
n
=
1
z
P
N
2
θ
a
N
1
φ
Φ
1
y
N
2
1
θ
x
Figure 8.22. Geometry for a circular array.
MATLAB program Ðcircular_array.mÑ
The MATLAB program
Ðcircular_array.mÑ
calculates and plots the rectan-
gular and polar array patterns for a circular array versus and constant
planes. It is given in Listing 8.4 in Section 8.8. The input parameters to this
program include:
θ
φ
Symbol
Description
Units
a
Circular array radius
λ
N
number of elements
none
theta0
degrees
θ
main direction in
phi0
degrees
φ
main direction in
Variations
ÒThetaÓ; or ÒPhiÓ
none
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