Computation of Dielectric Constants and Loss Tangents at ISM Band by Measurements of Transmission Coefficients

摘要

The ISM band at 2.4GHz has mostly been used or planned for indoor systems. This band is also attractive for outdoor systems owing to the ease of the system deployment, as no frequency licenses are required. In this paper, a multiple successive internal multireflection model is used to estimate the complex electric permittivity at 2.4GHz band. To obtain the data, measurements are performed at 160MHz bandwidth centered about 2.4GHz using a vector network analyzer, which provides information about the amplitude and phase of transmission coefficient. Several samples of each material are measured and the results vary from sample to sample. It has also been found that some obstacles have polarization behaviour.