Structural design has been increasingly exploited as an effective strategy for broadband microwave absorption, enabling tailored electromagnetic responses without modifying intrinsic material compositions. In this work, a structure-mediated magnetic composite absorber is proposed by introducing a cruciform unit cell with a four-lobed central aperture, which allows parameter modulation of the frequency-dependent effective permittivity and permeability through geometry-induced electric and magnetic field localization, thereby achieving broadband impedance matching and efficient dielectric-magnetic loss synergy. Both simulations and experiments demonstrate that the proposed absorber, with a total thickness of 4 mm, exhibits an effective absorption bandwidth of 13.0 GHz (4.5–17.5 GHz, reflection loss <$-10\mathrm{dB}$), covering the C, X, and Ku bands. In addition, the design exhibits polarization insensitivity and stable performance under a moderate oblique incidence of up to ${30}^{\circ }$. This work establishes a single-layer, composition-preserving strategy in which geometry-induced electric and magnetic responses are jointly engineered, extending broadband magnetic-composite absorber design beyond conventional material reformulation and multilayer stacking.

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• Magnetic coupling
• Magnetic susceptibility
• Metamaterials
• Magnetic thin films
• Microwave techniques