Toward an Ultra-Wideband Hybrid Metamaterial Based Microwave Absorber

Abstract

In this paper, we propose a novel design of an ultra-wideband hybrid microwave absorber operating in the frequency range between 2 GHz and 18 GHz. This proposed hybrid absorber is composed of two different layers that integrate a multiband metamaterial absorber and a lossy dielectric layer. The metamaterial absorber consists of a periodic pattern that is composed of an arrangement of different scales of coupled resonators and a metallic ground plane, and the dielectric layer is made of epoxy foam composite loaded with low weight percentage (0.075 wt.%) of 12 mm length carbon fibers. The numerical results show a largely expanded absorption bandwidth that ranges from 2.6 GHz to 18 GHz with incident angles between 0° and 45° and for both transverse electric and transverse magnetic waves. The measurements confirm that absorption of this hybrid based metamaterial absorber exceeds 90% within the above-mentioned frequency range and it may reach an absorption rate of 99% for certain frequency ranges. The proposed idea offers a further step in developing new electromagnetic absorbers, which will impact a broad range of applications.

A direct laser-synthesized magnetic metamaterial for low-frequency wideband passive microwave absorption

“…The absorber, designed and fabricated using LDW, has the widest bandwidth reported thus far, with the lowest thickness in the low-frequency band. Figure 13 presents a comparison of the fractional bandwidth and relative thickness (relative thickness = thickness/λ L , where λ L is the wavelength corresponding to the minimum operating frequency) of conventional, metamaterial [13,[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65], and proposed absorbers, thus demonstrating the improvement in the microwave absorption achieved by the metamaterial designed and achieved through LDW.…”

“…Pan et al reported the application of rGO laminates for ultra-wideband microwave absorption and demonstrated that a coating with a thickness of over 30 mm provided efficient absorption in the range of 2-10.8 GHz, which hindered its conformal and miniature applications [46]. Assal et al demonstrated a multiband hybrid layer metamaterial-based array for a microwave absorber, with an absorber thickness of approximately 16.2 mm and a high absorption performance of greater than 95% from 2.6 GHz to 18 GHz [47]. However, its low cutoff frequency of 2.6 GHz did not fully cover the S-band, which is crucial for wireless communication and radar applications.…”

A review on the pursuit of an optimal microwave absorber

“…Until recently, there have been a number of investigations on microwave absorbers comprising of varying absorption levels, bandwidth and polarization independency over a wide-ranging angle of incidence with various thicknesses and few other parameters in different frequency ranges [78][79][80][81][82][83][84][85][86][87][88].…”

Metamaterial absorber for L-band, S-band and C-band applications

“…This is used to achieve lower frequency band applications such that Bluetooth etc. The peak gain of 4.4 dB by using this implementation was measured [7]. Dielectric resonator fabricated which helps to increase gain and e ciency in this simulation two cylindrical holes were inserted over the antenna into the dielectric resonator thus 4.79 dB gain was the peak gain was measured by the author [8].…”