Pneumatic Structural Deformation to Enhance Resonance Behavior for Broadband and Adaptive Radar Stealth

Abstract

Ideal radar absorbing materials (RAMs) require instantaneous, programmable, and spontaneous adaptability to cope with a complex electromagnetic (EM) environment across the full working frequency. Despite various material systems and adaptive mechanisms having been demonstrated, it remains a formidable challenge to integrate these benefits simultaneously. Here, we present a pneumatic matrix that couples morphable MXene/elastomer conductors with dielectric spacers, which leverages controllable airflow to reconfigure the spatial structure between a flat sheet and a hemispherical crown while maintaining resistance stability via wrinkle folding and unfolding. The interdimensional reconfigurations drastically induce multiple resonance behavior, enabling the matrix remarkable frequency tunability (144.5%), ultrawide bandwidth (15 GHz), weak angular dependence (45°incidence), ultrafast responsiveness (∼30 ms), and excellent reproducibility (1000 cycles). With multichannel fluidic and conceptual automated control systems, the final pneumatic device demonstrates a multiplexed, programmable, and autonomous transformable mode that builds a promising platform for smart radar cloaking.

Silver Nanowires Grown In Situ on Mercapato-Modified Graphene Oxide for Electromagnetic Interference Shielding

“…Specifically, the EMI SE of AgNPs/GO coating reaches 44.22 dB, while the EMI SE of AgNWs/GO-SH coating achieves a high level of 65.23 dB, meeting the commercial standard of 20 dB. Analysis based on eq reveals that the total EMI SE comprises two components: reflection loss (SER), multiple reflection loss (SEM), and absorption loss (SEA). , The impedance mismatch between air and the surface of the shielding material leads to surface electromagnetic reflectivity (SER), while the surface electromagnetic absorption (SEA) arises from Ohmic loss, magnetic loss, and polarization loss. , For materials with nonporous and multilayer structures, SEM can typically be disregarded when the SE value exceeds 15 dB. The SET, SER, and SEA values of GO, AgNPs/GO, and AgNWs/GO-SH are illustrated in Figure f.…”

MoS2-Decorated Tubular Carbon Nanostructures with Enhanced Dielectric Loss for Boosting Microwave Absorption

“…The introduction of S atoms typically results in the formation of numerous vacancies within the material, while the introduction of N atoms leads to the generation of pyridine nitrogen defects. These vacancies and defects can act as polarization centers, attenuating the incident EM wave through dipole-oriented polarization . On the other hand, the replacement of C atoms with additional S and N atoms will enhance the polarization effect and increase conductivity, thereby improving the MA properties of the material .…”

Nanoconfined Magnetic Network Constructed by a NiCo Alloy Doped Interconnected Carbon Nanotube toward Enhanced Electromagnetic Wave Absorption Performance

“…Modern wireless communication and detection technology based on electromagnetic waves (EMWs) has constantly and profoundly changed society and human lifestyle. Nonetheless, EMW interference/radiation has negative effects on military security, human health, and the lifespan of electronic devices. − Consequently, diverse EMW absorption materials have been developed to address these issues. − In the face of an increasingly harsh electromagnetic environment and upcoming smart era, − it is urgent to develop lightweight EMW absorption materials with a wide absorption bandwidth, strong absorption ability, and thin thickness by rational design of the microstructure of the EMW absorption material.…”