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It is shown that, in the microwave power spectrum, the field penetration depth in a wet material increases rapidly with temperature. The selectivity of coupling to a wet material is analysed for softwoods. It is shown that the selectivity is both moisture and temperature dependent, the action being self-regulating, except at low moisture contents. The average bulk dielectric constant for softwoods below fibre saturation point is determined experimentally at one frequency (9.21 Gc/s) and compared with theory. Approximate empirical relations are given for dielectric behavior in the microwave power spectrum, 1 to 10 Gc/s.
Industry and General Applications, IEEE Transactions on (Volume:IGA-2 , Issue: 3 )
Date of Publication: May 1966