article · Physica Scripta
This research introduces a novel hyper-elliptic trust region optimisation algorithm, combined with kriging surrogates, for designing highly efficient and compact wideband metamaterial absorbers (MMAs). The algorithm is linked to a full vectorial finite element method to simulate absorption performance. To validate the technique, an existing MMA design with triangular resonators was re-optimised, achieving over 90% absorption across a broad frequency band from 10.9 GHz to 21.48 GHz. Furthermore, a new MMA with cross-shaped resonators was designed, fabricated, and tested, demonstrating over 90% absorption from 14.18 GHz to 28.98 GHz for both transverse electric and transverse magnetic polarisations. This design also maintained robust absorption for a wide angular range up to 40 degrees.
Efficient wideband metamaterial absorbers are crucial for managing electromagnetic waves in various technologies. This research provides an advanced optimisation method to design such absorbers, potentially leading to improved performance in applications requiring electromagnetic wave control, such as stealth technology, electromagnetic shielding, or advanced sensor systems.
This research presents an advanced optimisation technique for designing metamaterial absorbers with high absorption across wide frequency bands and broad angles. Such highly efficient and compact designs could be applied in areas requiring electromagnetic wave absorption, like stealth coatings for defence, electromagnetic interference shielding for electronics, or specialised sensor components. The successful fabrication and testing of a novel design suggest this is applied research, potentially leading to practical components for industry partners.
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Abstract This article provides a novel hyper-elliptic trust region optimization algorithm with kriging surrogates that is employed to obtain highly efficient designs of wideband metamaterial absorbers (MMAs) exhibiting high absorption with compact size. The introduced optimization algorithm is dynamically linked to the full vectorial finite element method to simulate the absorption performance of the investigated absorbers. To validate the capability of the proposed optimization technique, a previous MMA design with triangular resonators is re-optimized, achieving greater than 90% absorption across large frequency band from 10.9 GHz to 21.48 GHz, encompassing the entire Ku-band and significant portions of the X- and K-bands. Then, a novel MMA utilizing cross-shaped resonators is designed, analyzed, and successfully fabricated with exceptional absorption performance more than 90% over a broad spectrum from 14.18 GHz to 28.98 GHz for both transverse electric and transverse magnetic polarizations, covering a large part of the Ku-band, the entire K-band, and the lower part of the Ka-band. Further, a robust absorption performance (above 90%) could be achieved for a wide angular range (up to 40 ∘ ) for the studied design. Consequently, the formulated optimization technique is proven to be a highly effective tool for obtaining accurate and efficient designs of MMAs with perfect absorption characteristics.
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DOI: 10.1088/1402-4896/ae9c75
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