Permittivity of Materials Used in the Pulp and Paper Industry
The permittivity of water is strongly dependent on both temperature and frequency. The data in Table 8.1 were collected from the literature for 3.0 and 9.346 GHz and calculated for 2.2 GHz. The calculation is based on polynomial approximations usable up to 40C(温度).
The permittivity of pulp fibers is only slightly affected by temperature and frequency. The values for paper are r1 =3.0 and r2 =0.1. The density of pulp is about 1.5 g/cm3(密度).
Table 8.1. Permittivity of water as a function of temperature and frequency