Tunable artificial microwave blackbodies based on metasurfaces.

Area of Science:

• Metamaterials and Nanophotonics
• Microwave Engineering
• Materials Science

Background:

• The classic hole-cavity model provides a basis for blackbody radiation.
• Metasurfaces offer unique electromagnetic properties for device applications.
• Tunable absorbers are crucial for advanced microwave systems.

Purpose of the Study:

• To propose and demonstrate an open metasurface blackbody operating at microwave frequencies.
• To achieve thermal tunability using a dielectric resonator with a high temperature coefficient of dielectric constant.
• To achieve magnetic tunability by incorporating ferrite into the resonator structure.

Main Methods:

• Design of a unit cell comprising a dielectric resonator on an opaque metal plate.
• Fabrication of thermally and magnetically tunable blackbody prototypes.
• Measurement of absorption spectra for experimental validation.
• Comparison of experimental results with electromagnetic simulations.

Main Results:

• The proposed open metasurface blackbody operates effectively at microwave frequencies.
• Demonstrated thermal tunability through the temperature coefficient of the dielectric resonator.
• Achieved magnetic tunability by integrating ferrite.
• Experimental absorption spectra closely matched simulation results.

Conclusions:

• The developed metasurface blackbodies are thermally and magnetically tunable.
• These devices offer a novel approach for practical tunable microwave absorbers.
• The findings open new avenues for advanced microwave absorption technologies.