Hardware and physical integration guideline PCR Sensor A111
Page 11 of 32
2022-03-08
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Figure 9. Simulated impact of lossless dielectric conformal coating on radar loop gain (RLG) at center frequency (60.5
GHz).
Figure 10. Simulated impact of conformal coating with ε
r
=2 and ε
r
=3 for different thicknesses.
3.4 Sensor underfill
Underfills can be used to fill the gap between the sensor package and PCB. The sensor underfill material
should be chosen to have as low dielectric constant and loss tangent as possible. Dielectric constant
determines the reflectivity of the medium and loss tangent indicates the dissipation effect of the material
and both are frequency dependent.
