Antenna-inspired Metamaterial Absorber with Low-profile, Wideband, and Fully Improved Angle Insensitive Performances

Inspired by the reciprocity theorem widely applied in antenna engineering, a new design method, based on omnidirectional radiation pattern synthesis and relative absorption pattern conversion, is proposed. And the design method mainly consists of two parts, in which the characteristic mode theory is used to guide the underlying modal behaviors and the dissipation tailoring is used for power exhaustion and impedance matching. Based on the design method, a mushroom-type unit-atom of absorber is proposed, and it is covered with resistive sheets. The simulated results demonstrate that, from 1.9 GHz to 4.2 GHz, the large-incident angle absorption of TM wave can be up to 82°, and the 90% absorption of TE plane wave can be up to 45°.