Davor Zaluski

Subwavelength Guiding of Electromagnetic Energy in Waveguide Filled with Anisotropic Mu-Negative Metamaterial

Abstract A counter-intuitive phenomenon of propagation below cut-off in a waveguide filled with an anisotropic mu-negative metamaterial is investigated analytically, numerically, and experimentally. It is shown that the equivalent plane waves that make up the waveguide mode are inhomogeneous, and this fact is responsible for subwavelength guiding of electromagnetic energy. It was also found that the microscopic (‘in-cell’) magnetic field distribution in a waveguide filled with split-ring resonators may significantly differ from the distribution in the homogenized waveguide. However, spatial averaging of a numerically calculated magnetic field across the unit cell yielded a distribution that was very similar to the distribution in the continuous mu-negative material. Experimental waveguides filled with split-ring resonators were prototyped in the 8-GHz band, and measurement results were found to be in good agreement with all analytical and numerical predictions. This shows that it is indeed possible to interpret the waveguide filled with split-ring resonators as a homogenized waveguide filled with a continuous anisotropic mu-negative metamaterial.

Practical realization of DB metasurface

In this Letter, experimental realization of recently proposed DB metasurface is presented. A compact DB unit cell is proposed and its operating principle is tested both numerically and experimentally. Practical realization of a single layer DB metasurface, composed of 16 DB unit cells, is presented. Prototyped DB metasurface was measured in a waveguide environment and obtained experimental results support theoretically predicted DB properties.

Practical aspects of DB metasurfaces- a brief review

Recently proposed DB boundary is a hypothetical surface, on which vanishing of normal components of D and B vector occurs. This paper reviews metasurface-based implementations of a DB boundary proposed so far and highlights possible future research directions.

Guiding and radiating properties of a metamaterial-based Resonant-Slot coupled cavity chain

Application of the Resonant-Slot Coupled Cavity Chain as a Composite Right-handed-Left-handed transmission line (CRLH line) at microwave wavelengths is discussed. Design strategies for both the CRLH guiding structure and the backward-forward scanning leaky-wave antenna are reported. First theoretical valuations point to high power ability of such type of antenna, consisting of slotted waveguide with resonator-based filling. Applications in experimental plasma physics are intended. Theoretical background, numerical simulations and first experimental results are presented.