Browsing by Author "Tutuncu, B."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Conference Object
    Metamaterial Biosensor for Ism Band Biomedical Applications
    (Institute of Electrical and Electronics Engineers Inc., 2020) Tutuncu, B.
    A metamaterial based microwave biosensor is presented for ISM band biomedical applications. Modeling and simulations are carried out in CST Microwave Studio. Initially a metamaterial resonator consisting of a microstrip meandered line with a middle gap and three separate microstrip lines is designed and optimized to operate at 2.45 GHz ISM band. In the first stage considering that there is air on the sensor surface, return / insertion loss curves are obtained, and then four different dielectric materials with four different permittivity; Taconic TLP-5 (ϵr = 2.2), Rogers RO4533 (ϵr = 3.4), Arlon AD450 (ϵr = 4.6), Preperm L570 (ϵr = 5.8) are applied respectively to the sensor surface. While there is a 1.2 change in the dielectric coefficient, a 100 MHz change is observed in the central resonance frequency at each step. This proved that this proposed structure can be used as a biosensor in detection studies of biomaterials such as cancer tissues and malignant cells whose permittivities has been determined by previous studies and is a good candidate for biomedical diagnosis.. © 2020 IEEE.
  • Thumbnail Image
    Conference Object
    High-Efficiency Dual Band Metamaterial Absorber for Ism Band Biosensor Applications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Tutuncu, B.; Altintas, Y.; Karahan, S.
    Metamaterials are not found directly in nature and exhibit extraordinary electromagnetic properties such as focusing. Thanks to this excellent focusing ability, they can increase the absorption rate and are therefore very good candidates for electromagnetic biosensor applications. For this purpose, in this study, a metamaterial absorber was developed in four stages. Different geometric structures were examined step by step and the effect of the capacity of the structure on the absorption rate for each step was investigated for two frequency values of the ISM band. According to the simulation results, the proposed metamaterial can absorb 99% and 90% of incoming signals at 2.38 GHz and 5.81 GHz, respectively. © 2022 IEEE.