Study on Microwave Absorption Performance Enhancement of Metamaterial/Honeycomb Sandwich Composites in the Low Frequency Band

Abstract

With the rapid development of electronic technology and modern radar detection system, there is increasingly urgent demand for microwave absorbing composites working efficiently in the low frequency range (e.g., 1–2 GHz). In this work, a type of metamaterial/honeycomb sandwich composite (MHSC) was proposed and fabricated, which exhibited a light weight structure and excellent wave-absorbing performance in the low frequency band. The relationship between the wave-absorbing properties and the design parameters of the composite, such as the thickness of the wave-transmitting skin, the thickness and dielectric properties of the wave-absorbing honeycomb, was systematically investigated. The electromagnetic coupling interference between the honeycomb absorber and metamaterial resonator proved to be a crucial factor that affects synergistic wave-absorbing performance in the low-frequency band. Under the rational design, the incorporation of subwavelength-sized phase-gradient metamaterial units in the composite can significantly improve low-frequency wave-absorbing performance for greater than 5 dB (an increment larger than 100%); and the obtained MHSC exhibits averaged reflectivity (Ra) less than −10 dB in the low frequency band of 1–2 GHz as well as outstanding performance (Ra < −14.6 dB) over an extremely wide frequency range (1–18 GHz). The MHSC reported in this study could be a promising candidate for the key material in high-performance radar stealth and other related applications.

An efficient parameter-retrieval-based surrogate-assisted optimization of on-platform honeycomb absorbing structures

“…Honeycomb absorbing structures have emerged as a widely used solution due to their high strength-to-weight ratio and excellent heat-insulation performance. These structures leverage the unique properties of honeycomb materials to achieve effective RCS reduction [15][16][17]. Traditional honeycomb designs are typically developed independently for materials and structures [18][19][20].…”

The wave mechanics for microwave absorption film-Part 3: Film with multilayers

“…Similar to the hierarchical structures with different interface organizations, multilayer film has been investigated for better microwave absorption [55][56][57][58][59][60][61][62][63][64][65][66][67][68]. Even though each layer k in the film shown in Fig.…”

Wave Mechanics of Microwave Absorption Films: Part 3 - Multilayered Films

“…Similarly, multilayer films, as depicted in Fig. 1, have been explored extensively to enhance microwave absorption performance [56][57][58][59][60][61][62][63][64][65][66][67][68][69]. Although each layer (k) within the film possesses its unique r,k and r,k properties, these are effectively averaged out when all the layers in the film are considered as a whole.…”