Multiband and Perfect Absorber with Circular Fishnet Metamaterial and its Variations

Ozturk Y., Yilmaz A. E.

APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL, vol.31, no.12, pp.1445-1451, 2016 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 12
  • Publication Date: 2016
  • Journal Name: APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1445-1451
  • Keywords: Absorptivity, dielectric loss, composite multiband metamaterial, metamaterial perfect absorber, Q-factor, surface loss, DESIGN, INDEX
  • Ankara University Affiliated: Yes

Abstract

In this study, a composite metamaterial unit cell is introduced based on experimentally proven circular fishnet metamaterials (CF-MMs) and its stripped versions to implement an absorber for Ku band microwave regime. The offered MM absorber shows the perfect absorptivity (99.9%), the near perfect absorptivity (96.2%) and the standard absorptivity (58%) over narrow band frequencies 14.28, 14.77 and 15.2 GHz, respectively. We offered a method to create a composite metamaterial unit cell consisting of resonant type metamaterial sub-unit cells that are not suitable for absorber implementations in normal conditions. The physical mechanism behind multi-band resonances in the left-handed medium (LHM) regime is explained in detail by revealing the reverse behavior in the right-handed medium (RHM) regime keeping a single resonance feature, based on cancellation of impinging electric fields and preservation of circulating electric fields around the MM space. A detailed analysis is performed to explore and compare the power losses due to imperfect dielectric and non-ideal conductor.