Objective In light of the constraints associated with conventional wave-absorbing structures, a groundbreaking broadband low-profile multilayer composite absorber has been meticulously engineered.

Method This innovative approach incorporates square ring resistive film units, which serve to significantly broaden the operational bandwidth. Additionally, it utilizes miniaturized conductor units that are predicated on lumped inductance loading principles, while also optimizing various structural parameters to realize broadband low-profile wave-absorbing capabilities. This optimization effectively contributes to a reduction in the minimum operational frequency.

Results The simulation outcomes demonstrate that the developed composite absorber achieves an impressive electromagnetic wave absorption rate that surpasses 90% across the frequency spectrum ranging from 3.22 to 14.63 GHz. This performance is characterized by a remarkable relative bandwidth expansion of 127.8% and a profile height measuring a mere 0.068λ_L.

Conclusion The operational mechanism of the absorber is thoroughly examined through the application of an equivalent circuit model, and potential avenues for further optimization are delineated. This design offers substantial insights and serves as a significant reference point for the advancement of broadband low-profile absorbers. Future work will focus on substituting lumped inductors with metal meander-line structures to reduce processing complexity and costs.