Abstract
A thin microwave radar absorber with metallic dipole arrays incorporated into magnetic polymer composite is proposed to operate over a wide range of incidence angles for both TE and TM polarizations. Owing to the impedance characteristics, the magnetic absorber (MA) without dipoles cannot hold oblique-incidence-absorption for TM polarization. By introducing dipoles, the incorporated MA exhibits a broad bandwidth for reflection equal or less than -10 dB for incidence angle up to 60° for TM polarization, and remains excellent oblique-incidence absorption for TE polarization. The improvement of oblique-incidence absorption for TM polarization is related to LC resonance caused by the embedded dipoles. The experimental results show that the proposed MA with a thickness of 2.0mm provides wide bandwidth (5.0 GHz ∼15.7 GHz for normal incidence and 4.5 GHz ∼14.8 GHz for incidence angle of 45°) for TM polarization, which is agreement with the simulated results.
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