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We demonstrate an active control of near-field coupling between dark and bright eigenmodes in terahertz metamaterials. The metamaterial unit cell consists of two orthogonally twisted split-ring resonators, which are tightly coupled with each other through near field. The monolayer graphene is integrated into the unit cell and the coupling strength of the near field can be actively modulated by the...
In the conventional directional modulation (DM) system without relay aiding, when the eavesdropper locates within the main-beam of the desired direction, it can intercept the confidential message from source Alice. In this paper, we propose a strategy to enhance physical-layer security of direction modulation in wireless transmission with the help of multi-relay cooperation. In this scenario, the...
Microwave staring imaging scheme based on range pulse compression and azimuth wavefront modulation is a new radar scheme. Under the condition of no relative motion between radar and scene, the scheme can obtain radar images with high resolution in both range direction and azimuth direction. The paper presents this imaging technique by theoretical analysis and simulation. Microwave staring imaging...
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