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 ₒ². 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.
Ashvanth et al. (Tue,) studied this question.