A Tunable Absorber Based on Plasma Composite Material with Dual-Channel and Broadband Properties

This paper proposes a plasma hybrid material-based absorbing device combining broadband absorption with two-channel characteristics. Two materials with a similar absorption effect are selected, one is a tunable plasma, and the other is an optimized metasurface, which has achieved a good absorption effect. Indium tin oxide (ITO) films and foam layers with different resistivities form the basis for the upper and lower absorbing layers, while a tunable plasma tube array is located between the two absorbing layers. The simulation results show that the device can achieve 90% in the 1 to 20GHz frequency band or even more in three intervals: 2.2GHz to 4.2GHz, 9.8 to 12.3GHz, and 18 to 20GHz. Verifying that the device can realize the movement of the strong resonance point and the working frequency band by adjusting the variable parameters, which is of great use in high-power electromagnetic protection and radar stealth.