Metameterial refraction characteristics within the millimeter-wave range

TL;DR

This study experimentally investigates the complex refraction behaviors of metamaterials in the millimeter-wave range, revealing wavelength-dependent transitions between positive and negative refraction properties influenced by structural element sizes.

Contribution

It provides new experimental insights into the spectral and angular dependence of metamaterial refraction, highlighting the transition points related to structural element sizes.

Findings

Refraction properties vary with wavelength and angle.

Transitions between positive and negative refraction occur at specific wavelengths.

Refraction characteristics depend on structural element sizes.

Abstract

Phase delays, spectral, orientation, and angular dependences of radiation refraction in metamaterial targets have been experimentally studied within the millimeter-wave range. It has been shown that angular and spectral dependences have a complicate structure, which demonstrated properties typical both for positive and negative refraction indexes. At this, a change of refraction nature occurs in radiation wavelength interval comparable with the sizes of metamaterial structural elements.