Classification of the fascia
Reflection and attenuation
Optimized thickness within a tolerance ±0.2
mm and permittivity within a tolerance ±0.05.
Dielectric loss factor tanδ shall be <0.03.
- Reflection coefficient <-10 dB
- 2-way attenuation <4 dB.
Painted
bumper
with
various
colors
Range of the permittivity
values between 2.5 and 3.2.
Dielectric loss
factor tanδ
<0.02
- Reflection coefficient <-6 dB
- 2-way attenuation <4 dB.
Dielectric loss
factor tanδ
>0.02
- Reflection coefficient >-6 dB
- The attenuation may exceed the maximum
allowed limit.
The examples described in the classification of the fascia are derived from evaluation of flat
plates with constant thickness and homogeneous material. Deviations from this situation may
cause a change in classification.
Surface Properties of the fascia
The surfaces of the fascia shall not exceed an average roughness height of 20 µm
(corresponding to ISO 1302 class N10; VDI 3400 class 45).
6.3 Installation Hints
To enable the full performance of the radar sensor, the following installation hints and
guidelines for the RF integration of the sensor must be used.
Maximum angle between radar cone and fascia
The angle α between the radar beam inside the radar cone and the fascia may not be larger
than 80° anywhere inside the radar cone
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