a Matlab package for phased array beam shape inspection

50 A FIGURES TO CHAPTERS 2–7
3
50×20 1.5×1.5 φ 0
=0.0° θ 0
=50.0° W V
=1.05°
3
50×20 1.5×1.5 φ 0
=15.0° θ 0
=50.0° W V
=1.08°
2
2
1
1
V offset (°)
0
V offset (°)
0
−1
−1
−2
−2
−3
−3 −2 −1 0 1 2 3
H offset (°)
−3
−3 −2 −1 0 1 2 3
H offset (°)
(a)
(b)
3
50×20 1.5×1.5 φ 0
=30.0° θ 0
=50.0° W V
=1.19°
3
50×20 1.5×1.5 φ 0
=15.0° θ 0
=65.0° W V
=1.65°
2
2
1
1
V offset (°)
0
V offset (°)
0
−1
−1
−2
−2
−3
−3 −2 −1 0 1 2 3
H offset (°)
−3
−3 −2 −1 0 1 2 3
H offset (°)
(c)
(d)
Figure 18: Shape of an array’s beam cross section . Panels (a)-(c) are for elevation 50 ◦ ,
panel (d) for elevation 25 ◦ . The rectangular plane array has size M x =
50, M y = 20 elements, with uniform element spacing of 1.5 wavelengths.
The contour plot shows the beam power gain at the 0.5, 0.1 and 0.01 levels
compared to the beam center. The plotted cross section is perpendicular to
the beam axis, with the plot x-axis in the horizontal plane; that is, the view
is as seen along the beam axis, away from the radar. The plots were produced
by beamshape2d.m.