Preperm® is a trade name of the finnish Premix group, a technology leader in electrical conducting plastics and RF materials. The products are used e.g. as car radar lenses and for 5G antennas.
Preperm® Low-Loss MaterialsThe plastic materialsen of Preperm® exhibit lowest loss factors and constant dielectric parameters across a wide frequency range beyond 100 GHz. Another advantage is the low absorption of water (< 0,25 %) compared with materials based on PEI, PBT or PC.
Constant Relative Permittivity at Microwave FrequenciesThe relative permittivity (dielectric constant) εr of Preperm®-materials shows very little variation at microwave and millimetre wave frequencies:
Low Dielectric Loss FactorThe loss factor tan δ is constant and extremely low:
PREPERM® Radome MaterialsThe radome materials of Preperm® combine lowest loss factor up to millimetre waves with high impact strength and moldability which makes them ideal for car radar systems. Flame retardant versions are available (flammability V0 according to UL94). The loss factor tan δ at 79 GHz is below 0.003. This results in a reduction of the two-way loss of almost 2 dB compared with other materials, see graph:
This in turn enables a substantially larger range of the car radar systems: