A broadband metamaterial absorber design using characteristic modes analysis

Abstract

In this paper, a broadband metamaterial absorber with a fractional bandwidth of 126.88% was presented. The characteristic mode theory was used to guide the design of the absorber. According to the analysis of characteristic mode and characteristic current, the resistance value of resistive films can be determined. The different modal information obtained through parameter changes can also better guide the design of the absorber. To study its operation mechanism, the equivalent impedance and surface current distribution of the proposed absorber have been analyzed. The final simulation and measurement results show that the proposed absorber has a wide absorbing bandwidth which is from 3.21 to 14.35 GHz, and the absorptivity is greater than 90%, covering the S, C, X, and Ku bands. In addition, for TE and TM polarization, it can achieve an absorptivity of more than 85% at 45° oblique incident and has good angular stability. Hence, the absorber has great potential applications in the field of electromagnetic stealth technology and Radar Cross Section reduction.

Redefinable planar microwave passive electronics enabled by thermal controlled VO2/Cu hybrid matrix

“…The microwave performance (resonance frequency, radiation pattern, and EM coupling) of the rectangular microstrip patch has been analyzed by using the theory of characteristic modes ( Wu et al., 2021 ; Kumar and Khanna, 2020 ). The radiation performance of the patch antenna is mainly dependent on the dominant mode, TM 01 .…”

Coherent perfect absorber and laser induced by directional emissions in the non-Hermitian photonic crystals

“…In this paper, we design a non-Hermitian PC with anisotropic emissions. We reveale the unique characteristics of wave propagation in this PC, including the significant amplification of the signal and collimation [31], and demonstrate some typical applications, such as angle sensors [32], coherent perfect absorbers [33,34], and lasers [35]. The non-Hermitian Hamiltonian model indicates that the real spectrum appears in the ΓY direction, while a complex spectrum appears in the ΓX direction.…”

Polarization Stable Triband Thin Square-Shaped Metamaterial Absorber

“…Te proposed absorber is the combination of the multiple graphene layers and the metamaterial absorber. In [34], the split-disk-based tunable absorber works at THz frequency application; in [35], broadband metamaterial absorber based on CMA is presented for S, C, X, and Ku bands; and in [36][37][38], metamaterial absorber, which is used for solar energy harvesting, is proposed. Te proposed structure is having signifcant features such as the triple-band, polarizationinsensitive, compactness, and simple shape that end in easy fabrication.…”