Efficient electromagnetic wave absorption (EWA) is essential for stealth technology and signal integrity, yet the development remains constrained by the trade-off between attenuation capacity and impedance matching. While the incorporation of magnetic phases can enhance impedance matching, it typically increases material density, which is detrimental to lightweight design. Herein, we demonstrate that Ni doping combined with oxygen vacancies (O_v) engineering induces a magnetic response in α-MnO₂ through local lattice distortion and defect-mediated spin asymmetry, thereby introducing frequency-dispersive magnetic-loss pathways. O_v introduces Mn 3d-derived defect states with uncompensated spins, while Ni–Mn 3d hybridization amplifies local symmetry breaking, consistent with enhanced local magnetic correlations. These effects, together with relaxation-dominated polarization loss at defect sites and carbon-coupled interfaces, establish dual-loss mechanisms that synergistically improve impedance matching and broaden the electromagnetic absorption bandwidth (EAB). Consequently, the materials achieve an effective EAB (RL ≤ -10 dB) of 5.24 GHz at a thickness of 1.65 mm and a minimum reflection-loss (RLmin) of -54.98 dB at 2.10 mm, with a low filler loading of 29 wt%. Furthermore, the material significantly reduces far-field scattering without requiring extrinsic magnetic additives. This work highlights defect engineering as a promising strategy to co-regulate magnetic and dielectric responses for next-generation, lightweight broadband EWA.

Flexible printed circuit (FPC) design in complex scenarios has a list of pin concentration areas, which lead to extremely congested intersection regions while connecting the pins. Currently, it is challenging to explore the routability and to find topologically non-crossing and routable paths manually for the nets timely. The existing bus planning methods cannot offer optimal solutions concerning the special resource distribution of the FPC design. To investigate an effective way to shorten the routing time of FPC and achieve enhanced performance, a bus planning algorithm is proposed to tackle complex area connection problems. On the basis of the pin location information, the routing space is partitioned and generally represented as an undirected graph, and the topological non-crossing relationship between different regions is obtained using the dynamic pin sequence. Considering the routability and electrical constraints, a heuristic algorithm is proposed to search the optimal location of the crossing point on the region boundary. Experimental results on industrial cases show that the proposed algorithm realize better performance in terms of count and routability in comparison with numerous selected state-of-the-art router and methods.

Integrated circuit (IC) camouflaging technique has been applied as a countermeasure against reverse engineering (RE). However, its effectiveness is threatened by a boolean satisfiability (SAT) based de-camouflaging attack, which is able to restore the camouflaged circuit within only minutes. As a defense to the SAT-based de-camouflaging attack, a brand new camouflaging strategy (called CamoPerturb) has been proposed recently, which perturbs one minterm by changing one gate’s functionality and then restores the perturbed circuit with a separated camouflaged block, achieving good resistance against the SAT-based attack. In this paper, we analyze the security vulnerabilities of CamoPerturb by illustrating the mechanism of minterm perturbation induced by gate replacement, then propose an attack to restore the changed gate’s functionality, and recover the camouflaged circuit. The attack algorithm is facilitated by sensitization and implication principles in automatic test pattern generation (ATPG) techniques. Experimental results demonstrate that our method is able to restore the camouflaged circuits with very little time consumption.