Abstract
Abstract
A periodic structure absorber combined with diodes and magnetic material is proposed in this paper. By changing the power supply voltage, the absorbing performance of the absorber can be changed to adapt to different electromagnetic environments. The influence of the diode resistance variation for the absorption property of the absorber is explored by the symmetry model and the equivalent circuit model, and the role of the diode is cleared in realizing the tunability of the absorber. The design of the branch structure circuit creates two absorbing peaks in the absorber, and due to the adding of the magnetic material, the structure proposed in this paper has the advantages of wider adjustable frequency and lower frequency absorption peaks. Experiments show that the absorption peak of the absorber changes from 4.3 GHz to 8.8 GHz when the bias voltage is changed from 0 to 9 V and the reflectivity envelope covers a broadband of 4–4.6 GHz and 6–9.3 GHz below −10 dB.
Funder
Fundamental Research Funds for the Central Universities
Key R&D Program of China
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials