It is proven that under certain conditions, in a limited dielectric medium without losses, there exist nonzero solutions to the homogeneous problem. If the medium is anisotropic, then in the region of inhomogeneity there can be electromagnetic energy and, at the same time, there is no radiation into the surrounding space.

中文翻译：

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谐振各向异性介电结构存在的条件

证明在一定条件下，在没有损耗的有限电介质中，齐次问题存在非零解。如果介质是各向异性的，则在不均匀区域中可能存在电磁能，同时不会辐射到周围空间。