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Utilization of geometry inspired array absorbers for electromagnetic device testing
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DOI：10.1007/s40089-023-00394-4.png)
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Abstract
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Performance of a microwave absorbing material can be increased by moulding it into a resonator structure. These tuned structures made up of lossy materials like dielectric cavities trapped the electromagnetic waves and dissipate them. However, resonator structures are narrowband, and to make them wideband absorbers, a technique has been proposed here. In the presented work, an array of dielectric cavity resonators has been proposed having cavities of different physical dimensions. Due to change in physical dimensions, all cavities have unique resonating peaks. Arranging these cavities into two-dimensional array leads to overlapping of all the resonating peaks, and accordingly, a broadband dielectric cavity resonator (DCR) array absorber is designed. Proposed array structure has - 22.6 dB reflection coefficient and 8 GHz (6 to 14 GHz) absorption bandwidth makes it a broadband absorber which can be utilized to build an anechoic chamber for testing the electromagnetic devices.
Keywords:
Electromagnetic absorber
Cavity structure
Reflection coefficient
Absorption bandwidth
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