  Complementary media (CM) interacting with arbitrarily situated obstacles are
usually less discussed. In this paper, an analytical framework based on
multiple scattering theory is established for analyzing such a mismatched case.
As examples, CM-based devices, i.e., a superlens and superscatterer, are
discussed. From an analysis, the cancellation mechanism of the mismatched CM is
studied. In addition, numerical results are provided for illustration.
Moreover, further study shows that such cancellation effects might rely on
specific conditions. Actually, the conclusions are not restricted to any
specific frequencies; they could be extended to many other areas including
applications to active cloaking, antennas, and wireless power transfer.
