Front Panel Thickness

Flooded-X sensor design can support front panel of 0.5 to 2mm in thickness. The front panel should have sufficiently high dielectric constant. The dielectric constants of some common materials are indicated in the following table.

Table 1. Dielectric Constants of Common Materials
Material Dielectric Constant
Air 1
Common glass 7.8
Pyrex Glass 4.8
Lexan 2.9
Polyethylene 2.3
Polystyrene 2.6
FR-4 5.2
Plexiglas 2.8
PVC, rigid 2.9
Mylar 3
Nylon 3.2
Teflon 2.1