Low frequency and broadband metamaterial absorber with cross arrays and a flaked iron powder magnetic composite

Wangchang Li,Jingwu Zheng,Xiaojing Qiao,Jing Yu,Shenglei Che,Yao Ying,Zuzhi Zhou,Liang Qiao,Liwei Wang,Qing Liu

doi:10.1063/1.5010821

Abstract

In this paper, we present a design, simulation and experimental measurement of a cross array metamaterial absorber (MMA) based on the flaked Carbonyl iron powder (CIP) filled rubber plate in the microwave regime. The metamaterial absorber is a layered structure consisting of multilayer periodic cross electric resonators, magnetic rubber plate and the ground metal plate. The MMA exhibits dual band absorbing property and the absorption can be tuned from 1∼8GHz in the same thickness depending on the dimension and position of the cross arrays. The obviously broadened absorbing band of the designed structure is a result of the synergistic effects of the electrical resonance of the cross arrays and intrinsic absorption of the magnetic layer. The polarization and oblique incident angle in TE and TM model are also investigated in detail to explore the absorbing mechanisms. The resonance current of the cross array can excite the enhanced local magnetic field and dielectric field which can promote the absorption. The measurement results are basically consistent with the simulations but the absorbing peaks move a little bit to higher frequency for the reason that the surface oxidation of the flaked CIP in the preparation process.

Highlights

Radar absorbing materials have attracted considerable attention in the fields of defense and civilian applications including wireless communications and EMI shielding.[1,2] Multiband and broadband absorber in wide frequency is increasingly required for the wide working frequency of the electronic device and radar
The schematic of the metamaterial absorber unit cells reveals in the Fig. 1(a), Fig. 1(b) and Fig. 1(c) which comprises a hybrid cross metamaterial absorber embedded in rubber based magnetic composite layer composed of a flaked Carbonyl iron powder (CIP) filled EPDM rubber.[25]
This paper has designed, simulated and experimentally demonstrated a metamaterial absorber based on the flaked CIP filled rubber plate

Summary

INTRODUCTION

Radar absorbing materials have attracted considerable attention in the fields of defense and civilian applications including wireless communications and EMI shielding.[1,2] Multiband and broadband absorber in wide frequency is increasingly required for the wide working frequency of the electronic device and radar. Many efforts have been made to the design of novel configurations and size optimization in order to achieve the broadband or multiband absorption.[18,19,20] These metamaterials derive their absorption properties primarily through the dielectric loss, Ohmic loss, interference theory and the impedance matching at resonance frequency resulting in the isolated absorbing peak.[21] In order to further broaden the absorbing band, the traditional magnetic medium replacing the dielectric substrates is an acceptable route to enhance the absorption. Simulation and measurement, a broadband MMA composite has been obtained with a new loss mechanism based upon the dipole resonance effect, Ohmic loss occurred at the metal surface

DESIGN AND EXPERIMENTS

AND DISCUSSION

Findings

CONCLUSIONS