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Level Radar LCR20
Installation
Beam angle
Figure 10.5
The beam angle is defined as the angle , at which the power density of the radar waves
reaches half the value of the maximum power 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
40 mm (1.5 inch) antenna,
W = D x 0.54
40 mm (1.5 inch) antenna with flooding protection tube,
W = D x 0.21
80 mm (3 inch) antenna with or without flooding protection tube,
W = D x 0.21
Relationship between beam angle , distance D and beamwidth diameter W
30 °
_
α
W = 2 × D × tan
2
α
W
and distance D.
12 °
12 °
25
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