The symmetry of the permittivity tensor is found to be based on the first law of thermodynamics and the non-wastage condition. 由热力学第一定律及无损条件导出了介电张量的对称性;
Free-space Single-receiver Measurement for the Complex Permittivity Tensor of Anisotropic Materials 单站散射测量各向介质特征参数的正问题