D
R
A
F
T
Micropilot FMR53, FMR54
Hauser
V. 1, Rev. 7, 26-10-2012
35
Beam angle
a
D
W
a
D
_
=
2
2
.
.
tan
W
A0016891
å
11
Relationship between beam angle
a
, distance D and beamwidth diameter W
The beam angle is defined as the angle
a
where the energy density of the radar waves reaches half the value
of the maximum energy density (3-dB-width). Microwaves are also emitted outside the signal beam and can
be reflected off interfering installations.
Beam diameter
W
as a function of beam angle
a
and measuring distance
D
:
FMR53
Beam angle
a
23°
Measuring distance (D)
Beamwidth diameter W
3 m (9.8 ft)
1.22 m (4 ft)
6 m (20 ft)
2.44 m (8 ft)
9 m (30 ft)
3.66 m (12 ft)
12 m (39 ft)
4.88 m (16 ft)
15 m (49 ft)
6.1 m (20 ft)
20 m (66 ft)
8.14 m (27 ft)
FMR54 - Horn antenna
Antenna size
150 mm (6 in)
200 mm (8 in)
250 mm (10 in)
Beam angle
a
23°
19°
15°
Measuring distance (D)
Beamwidth diameter W
3 m (9.8 ft)
1.22 m (4 ft)
1 m (3.3 ft)
0.79 m (2.6 ft)
6 m (20 ft)
2.44 m (8 ft)
2.01 m (6.6 ft)
1.58 m (5.2 ft)
9 m (30 ft)
3.66 m (12 ft)
3.01 m (9.9 ft)
2.37 m (7.8 ft)
12 m (39 ft)
4.88 m (16 ft)
4.02 m (13 ft)
3.16 m (10 ft)
15 m (49 ft)
6.1 m (20 ft)
5.02 m (16 ft)
3.95 m (13 ft)
20 m (66 ft)
8.14 m (27 ft)
6.69 m (22 ft)
5.27 m (17 ft)
