Validation of Ultra-Wideband Periodic ENZ Material

• Published in: International Conference on Microwave and Millimeter Wave Technology proceedings Vol. 1; pp. 01 - 03
• Main Authors: Song, Haoyu, Su, Ming, Yan, Chuming, Gao, Zhaodong, Liu, Yuanan
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16.05.2024
• Subjects: Bandwidth; Dielectric constant; epsilon-near-zero materials; Permittivity; phase invariant; Phased arrays; S-parameter; Scattering parameters; Simulation; Software
• ISSN: 2994-3124
• DOI: 10.1109/ICMMT61774.2024.10671674

This paper explores the fundamental properties of epsilon-near-zero (ENZ) materials and an analytical approach. When electromagnetic waves traverse an ENZ medium, their phase remains invariant, theoretically. A periodic structure is proposed as a feasible method for equivalent ENZ materials, and a structure is designed to realize epsilon-near-zero region via conventional bent lines, whose permittivity curve is retrieved through the S-parameter inversion method. The greatest advantage of the proposed structure is its ability to achieve a wide range of near-zero permittivity, with a bandwidth of 1.5 GHz for permittivity ranging from -0.1 to +0.1. Simulation results confirm that the phase through the bent line array aligns with the pre-incidence, and the zero point of the permittivity shifts with different array arrangements. Compared to conventional equivalent cutoff waveguides and line dielectrics, our bent-line arrays are compact, easy to fabricate, portable and economic. 1 .