Rotate Antennas and Arrays
To rotate antenna elements in Antenna Toolbox™, use the
Tilt property specifies the angles of rotation of
the antenna in degrees. The
TiltAxis property specifies the one or
more axes of rotation (X, Y, Z)
of the antenna.
Rotate Single Antenna Element
Create a patch antenna. By default, this antenna is on the X-Y plane.
patch = patchMicrostrip; show(patch)
To make the antenna lie on the Y-Z plane, rotate it by 90 degrees about the Y-axis. The rotation follows the standard right-hand rule.
patch.TiltAxis ='Y'; patch.Tilt = 90; show(patch)
The patch lies behind the ground plane and is not visible. To make the patch visible change
TiltAxis property to
[0 -1 0]. The
Tilt property is still
90, but the axis of
rotation is now the Y-axis. The negative number in the
vector determines the direction of rotation about the Y-axis as per the right-hand
patch.TiltAxis = [0 -1 0]; show(patch)
Rotate Single Antenna Element About Multiple Axes
Create a dipole antenna. Change the direction of rotation of the antenna with two rotations
simultaneously. Rotate the antenna by
90 degrees about the axis
[0 1 0] and rotate it by
degree about the axis specified by
[0 1 1].
d = dipole('Tilt',[90 90],'TiltAxis', [0 1 0; 0 1 1])
dipole with properties: Length: 2 Width: 0.1000 FeedOffset: 0 Tilt: [90 90] TiltAxis: [2x3 double]
Rotate Dipole-Backed Reflector
TiltAxis properties are available for
dipole and reflector elements. Use these properties if you want to model an antenna
parallel or perpendicular to the ground plane.
Create a reflector element. By default, the dipole is parallel to the reflector element.
r = reflector; show(r)
The dipole is the exciter element of the reflector. View its properties.
dipole with properties: Length: 0.1500 Width: 0.0050 FeedOffset: 0 Tilt: 90 TiltAxis: [0 1 0]
Based on the
TiltAxis properties the dipole
element is rotated by 90 degrees about the y-axis and is parallel to the X-Y plane.
To make the dipole perpendicular to the X-Y plane, change the
Tilt property of the dipole to
r.Exciter.Tilt = 0; show(r)
Rotating the reflector element rotates the entire structure by the specified angle. To rotate
the complete antenna, use the
Tilt property of the reflector
object. For example, rotate the reflector by 90 degrees about the X-axis. According
to the right-hand rule, the reflector now lies in the X-Z plane with the
r = reflector; r.Tilt = 90; show(r)
Rotate Antenna Array
Create an array of Archimedean spirals with the whole array rotated at 30 degrees about the X-axis and Y-axis. First create one spiral antenna.
s = spiralArchimedean; l = linearArray('Element',s,'ElementSpacing',0.1,... 'NumElements',3,'Tilt',30,'TiltAxis',[1 1 0]); show(l)