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A metamaterial absorber covering S, C, X, Ku, K bands applications and its miniaturized counterpart conduct biomedical sensing

Published online by Cambridge University Press:  16 September 2025

Balu Ashvanth Open the ORCID record for Balu Ashvanth [Opens in a new window] ,
Bactavatchalame Partibane Open the ORCID record for Bactavatchalame Partibane [Opens in a new window]  and
M Sankar
Balu Ashvanth*
Affiliation:
Department of ECE, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, India
Bactavatchalame Partibane
Affiliation:
Department of ECE, Sri Sivasubramaniya Nadar College of Engineering, Chennai, India
M Sankar
Affiliation:
Department of ECE, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, India
*
Corresponding author: Balu Ashvanth; Email: ashvanthece@gmail.com
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Abstract

A metamaterial absorber is proposed that features multiple absorption peaks ranging from 2 to 20 GHz, tailored for multiband radar applications. It employs low-cost FR4 dielectric as the substrate material and has a compact footprint of 0.0068$\lambda _o^2$. The multiband absorption properties of this absorber are crucial at microwave frequencies for radar applications, particularly for reducing radar cross-section and providing electromagnetic interference shielding. The miniaturized version of this absorber acting as a biosensor at THz range features multiple absorption bands, surpassing the count of comparable biosensors. This enhancement increases the sensing resolution and provides greater resistance to false peak shifts. The proposed biosensor exhibits a remarkable sensitivity of 4.64 THz/RIU, enabling the detection of even slight variations in refractive index, thereby enhancing cancer detection compared to recent studies. The analysis indicates that it achieves an impressive absorption rate of over 90% across all operating frequencies, with a peak Q-factor of 90.71, enhancing the interaction between THz waves and biomolecules, thereby ensuring precise detection. This absorber shows a stable response across various polarization angles and reaches optimal absorption for incident angles from 0° to 60° for both transverse electric and transverse magnetic waves. This works facilitates the detection of cancer among humans at the earlier stage with a portable and cost-effective sensing device.

Keywords

absorberbiomedicalmetamaterialpolarizationsensor

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 15
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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