科研之友
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摘要
We present the design, simulation, fabrication, and measurement of a tunable metamaterial absorber (MMA) by embedding varactor diodes as an active element inside metamaterial units. A pair of feed lines are used to control the reverse bias voltage on the diode. The proposed absorber can perform perfect absorption peak at the resonant frequency. The resonant frequency can be tuned in a wide frequency range by changing the reverse bias voltage on the both ends of the varactor diodes. The experimental results show excellent absorption rates under different reverse bias voltage on the diode with the measured bandwidth of 0.74 GHz, which are in good accordance to the simulated results. With geometrical parameters scaling and graphene replacing of varactor diode, the tunable MMA presents good absorptivity from 1.85 THz to 2.36 THz.
