A tunable metamaterial absorber using varactor diodes

By Jie Zhao, Qiang Cheng, Jie Chen, M. Qi, Wei Xiang Jiang, T. Cui. 2013

307 citations recorded by the source corpus.

We present the design, analysis and measurements of a polarization-insensitive tunable metamaterial absorber with varactor diodes embedded between metamaterial units. The basic unit shows excellent absorptivity in the designed frequency band over a wide range of incident angles. By regulating the reverse bias voltage on the varactor diode, the absorption frequency of the designed unit can be controlled continuously. The absorption mechanism is interpreted using the electromagnetic-wave interference theory. When the metamaterial units are placed along two orthogonal directions, the absorber is insensitive to the polarization of incident waves. The tunability of the absorber has been verified by experimental results with the measured bandwidth of 1.5 GHz (or relative bandwidth of 30%).

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/724deba8b0f8716be394c37b1c00393bf46f1820

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In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Metantenna: When Metasurface Meets Antenna Again (2020, background): “To overcome the intrinsic limitations of passive metasurface absorbers, active electronics and magnetic materials provide effective routes to ultrawideband absorption [119], [120], tunable bands [121], switchable absorption [122], nonlinear responses [123], and so on.”
A Reconfigurable Broadband Polarization Converter Based on an Active Metasurface (2018, background): “Unlike the control system in [34], the proposed biasing lines and ground plane lie on the same face of the dielectric substrate, which prevents the use of additional dielectric layers and simplifies the structure of a”
Toward Smart Wireless Communications via Intelligent Reflecting Surfaces: A Contemporary Survey (2019, background): “The tunable chips can also be varactor diodes, which can be adjusted in a continuous way given different voltage bias, e.g., [44], [45].”
Intelligent Metasurfaces with Continuously Tunable Local Surface Impedance for Multiple Reconfigurable Functions (2018, methodology): “This capability allows for local, continuous tunability, greatly enhancing the possible functionalities of the metasurface compared with existing binary encoded [31,32] and tunable varactor [29] designs.”
RIS-Aided Wireless Communications: Prototyping, Adaptive Beamforming, and Indoor/Outdoor Field Trials (2021, background): “TABLE II EQUIVALENT CIRCUIT PARAMETERS OF VARACTOR DIODE [26]”