EMT Conversion of Composite Broadband Absorbent Metamaterials for Stealth Application Over X-Bands

Junping Duan,Hongcheng Xu,Rui Zhang,Rui Liu,Binzhen Zhang,Byung-Sung Kim

doi:10.1109/access.2020.3018018

Junping Duan, Hongcheng Xu + Show 4 more

Open Access

https://doi.org/10.1109/access.2020.3018018

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Abstract

A validating approach for electromagnetic thermal (EMT) conversion of a composite broadband absorbent metamaterials (AMs) is proposed in this paper. The integrated multilayer AMs consisting of top square loop (Q-loops) array layer, middle metal plate-polymer sandwich, bottom Q-loops array layer stacked vertically is analyzed with finite-different time-domain (FDTD) algorithm and fabricated by High Density Interconnector (HDI) process and Micro-electromechanical Systems (MEMS) technology. The implemented composite layered structure with the dielectrics and subsequent multi metal loops has broadband bandwidth over 2.5GHz in X-bands. High absorption performance in various incident waves with different polarizations and incident angles basically maintains a fixed efficient level of the AMs with diverse absorbing states in wide operating band. Electromagnetics and thermal multiphysics analysis validates the EMT conversion of the AMs in induced strong electromagnetic resonance. The integrated thermal conduction device is loaded on the back of AMs to transfer the converted thermal energy in time, which effectively reduces the surface thermal distribution. Finally, absorbent properties tested by free space methods and thermocouple and infrared thermal imaging (ITI) system shows the polarization independent energy transformation in greatly accordance with numerical analysis. This investigation shows the potential application of AMs in stealth systems to achieve both electromagnetic stealth and infrared thermal stealth through EMT energy conversion.

Highlights

THEORETICAL BACKGROUND Electromagnetic absorbent metamaterials (AMs) consisting of infinite cells with periodical arrangement consistently induce organized LC, dielectric surface and dipole resonance what restrain EM wave propagation in a resonant tank leading valid loss of EM energy. When both the equivalent permittivity εe = ε −jε and permeability μe = μ −jμ of AMs are equal to the acute degree of motion of EM wave with incidence to materials in vacuum, EM wave propagates over an AMs achieving perfect impedance matching. ε is a parameter that describes the degree of polarization, and μ describes the degree of magnetization. ε andμ denotes the electronic and magnetic loss of measured materials respectively [42], which configurates the absorbent level of the AMs evaluating the absorptivity
This study demonstrates an electromagnetic thermal (EMT) conversion strategy of a composite active broadband AMs with high absorption and polarization insensitivity
The physical mode of the proposed AMs is constructed from the finite-different time-domain (FDTD) simulated structure to the fabricated sample storage by High Density Interconnector (HDI) and Micro-electromechanical Systems (MEMS) process

Summary

Introduction

Artificial metamaterials, which own advantaged electromagnetic (EM) manipulating capability in dual negative refractive index modification [1], [2], radar cross-section (RCS) reduction [3], [4], frequency selectivity [5]–[8] and antenna properties improvement [9], [10], have intrigued great interests for stealth domain [11], [12], super-resolution imaging [13]–[15], energy harvesting [16]–[19], beam scanning [20], [21], and even acoustical [22]–[24], terahertz [25], The associate editor coordinating the review of this manuscript and approving it for publication was Kuang Zhang.optical [26]–[28] applications. J. Duan et al.: EMT Conversion of Composite Broadband AMs for Stealth Application Over X-Bands attributes to metal LC resonance [29], surface resonance [30], ohmic loss [31], dielectric loss [32], and wave propagated paths loss [33], [34].

Results

Conclusion