Partial focusing by a bulk metamaterial formed by a periodically loaded wire medium with impedance insertions

摘要

In this paper, a uniaxial wire medium periodically loaded with metallic patches and lumped impedance insertions is proposed for partial focusing of electromagnetic radiation due to a magnetic line source. The analysis is based on the nonlocal homogenization model for a bi-layer mushroom structure with generalized additional boundary conditions for loaded vias, and it is extended to a multilayered configuration with the transfer matrix approach. The proposed structure exhibits a high transmission and is nearly insensitive to the losses. The analytical results are validated against full-wave numerical simulations.