The resonance method at 5 GHz is used for the characterization of low-loss materials. These materials are non-dispersive, i.e., the properties are frequency-independent. This was verified using DAK-TL2 over 4 MHz – 67 GHz (for permittivity only). Hence, in a first approximation, the values provided in the table below can be applied for any frequency.
|Material||Relative Permittivity (ε')||Loss Tangent (tan δ)|
The measurement uncertainties for permittivity and loss tangent for the applied resonance method are: