With the increasing seriousness of electromagnetic pollution in civil applications and national defense,current radar absorbing structures(RASs)with narrow absorption performance and high density are inadequate to mee...With the increasing seriousness of electromagnetic pollution in civil applications and national defense,current radar absorbing structures(RASs)with narrow absorption performance and high density are inadequate to meet the demands for excellent electromagnetic absorption performance.Therefore,achieving broadband absorption capabilities in RASs across the frequency range of 2 to 40 GHz is a pressing issue and a topic of significant interest.This review article summarizes the multi-dimensional design of broadband RASs by integrating materials,structures,and manufacturing processes,promoting the application of novel materials in three-dimensional structures through advanced manufacturing processes in the future.Meanwhile,the multi-scale absorption mechanism,including the micro-scale absorption attenuation mechanism and macro-scale absorption resonance,has been relatively new frontier has been discussed,highlighting their potential for diverse applications across multiple fields.展开更多
Here,we present a unique method to enhance the low-frequency absorption performance of a honeycomb absorber by integrating a metasurface.The geometrical dimensions of the proposed metasurface have been numerically opt...Here,we present a unique method to enhance the low-frequency absorption performance of a honeycomb absorber by integrating a metasurface.The geometrical dimensions of the proposed metasurface have been numerically optimized.The introduction of the metasurface allows exploitation of its robust resonance and superior impedance matching in low-frequency bands,thereby improving microwave absorption properties.The incorporation of the metasurface does not impact the wave transmission performance of the honeycomb core absorber at high-frequency band,thus preserving its high-frequency performance.This broadens the absorption range,leading to an expanded bandwidth.Simulation results reveal that the composite absorber(CA)exhibits strong absorption performance with an incident angle stability up to 45°for both transverse electric(TE)and transverse magnetic(TM)modes.The absorption mechanism of the CA has been investigated by using an equivalent circuit model and electromagnetic field analysis.A prototype was designed,fabricated,and tested to validate the proposed method.Both simulation and measurement results demonstrate that the prototype can achieve an average absorption rate exceeding 90%across a 1.0-18.0 GHz range.This study introduces an innovative technique for creating microwave absorbers for low-frequency wideband applications.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12402173,52373271)the National Key R&D Program of China(Nos.2023YFB3709602,2023YFB3709603)the Key R&D Program of Shaanxi Province(No.2024CY-GJHX-33).
文摘With the increasing seriousness of electromagnetic pollution in civil applications and national defense,current radar absorbing structures(RASs)with narrow absorption performance and high density are inadequate to meet the demands for excellent electromagnetic absorption performance.Therefore,achieving broadband absorption capabilities in RASs across the frequency range of 2 to 40 GHz is a pressing issue and a topic of significant interest.This review article summarizes the multi-dimensional design of broadband RASs by integrating materials,structures,and manufacturing processes,promoting the application of novel materials in three-dimensional structures through advanced manufacturing processes in the future.Meanwhile,the multi-scale absorption mechanism,including the micro-scale absorption attenuation mechanism and macro-scale absorption resonance,has been relatively new frontier has been discussed,highlighting their potential for diverse applications across multiple fields.
基金supported by the National Natural Science Foundation of China(Nos.52073010 and 52373259)。
文摘Here,we present a unique method to enhance the low-frequency absorption performance of a honeycomb absorber by integrating a metasurface.The geometrical dimensions of the proposed metasurface have been numerically optimized.The introduction of the metasurface allows exploitation of its robust resonance and superior impedance matching in low-frequency bands,thereby improving microwave absorption properties.The incorporation of the metasurface does not impact the wave transmission performance of the honeycomb core absorber at high-frequency band,thus preserving its high-frequency performance.This broadens the absorption range,leading to an expanded bandwidth.Simulation results reveal that the composite absorber(CA)exhibits strong absorption performance with an incident angle stability up to 45°for both transverse electric(TE)and transverse magnetic(TM)modes.The absorption mechanism of the CA has been investigated by using an equivalent circuit model and electromagnetic field analysis.A prototype was designed,fabricated,and tested to validate the proposed method.Both simulation and measurement results demonstrate that the prototype can achieve an average absorption rate exceeding 90%across a 1.0-18.0 GHz range.This study introduces an innovative technique for creating microwave absorbers for low-frequency wideband applications.
