Efficient Optimization Design Method for Ultra-Wideband Absorber Utilizing Frequency-Dispersive Paper-Composites
This work presents a novel design method for ultra-wideband absorbers using frequency-dispersive materials. In this method, a characterization model for permittivity is constructed and then integrated with a modified genetic algorithm for further optimization. Firstly, a carbon nanotube (CNT) doped...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
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| Series: | IEEE Open Journal of Antennas and Propagation |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10966442/ |
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| Summary: | This work presents a novel design method for ultra-wideband absorbers using frequency-dispersive materials. In this method, a characterization model for permittivity is constructed and then integrated with a modified genetic algorithm for further optimization. Firstly, a carbon nanotube (CNT) doped paper composite (PC) is presented, which exhibits obvious frequency-dependent dielectric loss characteristics. The composite is then incorporated into a periodic-plate array (PPA), thereby enabling flexible adjustment of the effective permittivity. Secondly, a Beta-distribution mathematical model is proposed to characterize the frequency-dependent permittivity of the PC-loaded PPAs. The model is then integrated with a genetic algorithm, offering an efficient approach for determining the optimal permittivity of materials in a multilayer absorber, thus achieving ultra-wideband absorption at a specific thickness. For demonstration, a three-layered absorber is designed and then fabricated using the presented CNT-doped composites with sheet resistances of <inline-formula> <tex-math notation="LaTeX">$100\Omega $ </tex-math></inline-formula>/sq and <inline-formula> <tex-math notation="LaTeX">$150\Omega $ </tex-math></inline-formula>/sq. The designed absorber has an absorption band (RL<−10dB) from 1.56 to 18 GHz (168%) with a thickness of 31mm (<inline-formula> <tex-math notation="LaTeX">$0.16{\lambda }_{\mathrm { L}}$ </tex-math></inline-formula>). The simulated and measured results exhibit good agreement, validating our proposed method. |
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| ISSN: | 2637-6431 |