Endress+Hauser Micropilot FMR67 - Page 28

Micropilot FMR67
28 V. 1, Rev. 3, 11-04-2017 Endress+Hauser
Beam angle
D
W
D
_
=
2
2
. .
tan
W
α
α
A0031824

11 Relationship between beam angle α, distance D and beamwidth diameter W
The beam angle is defined as the angle α where the energy density of the radar waves reaches half
the value of the maximum energy density (3dB width). Microwaves are also emitted outside the
signal beam and can be reflected off interfering installations.