Browsing by Author "Ertugrul, Mehmet"

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Designing Graphene-Based Antenna for Terahertz Wave Ablation (Twa) System
(2022) Ertugrul, Mehmet; Geyikoğlu, Miraç Dilruba; Polat, Hilal Koc; Cavusoglu, Bulent; Abbasian, Karim
Cancer is one of the most feared health problems today. Studies on cancer diagnosis and treatment are carried out intensively. In this study, a graphene-based antenna is proposed for cancer diagnosis and treatment with THz radiation therapy, which is a relatively new radiation technique. A graphene-based two-layer monopole antenna is designed for 1.65THz operation frequency. To change the bandwidth and radiation pattern without changing the operating frequency, a graphene ring is placed on the SiO2 substrate (2nd layer).Antenna performance is analyzed for reflection coefficient, realized gain, E-Field. The proposed antenna is obtained approximately %4 bandwidth. A peak gain of 8.52 dB is achieved at 1.65THz within the bandwidth. Antenna design is done in Computer Simulation Technology Studio Suite. It is expected that the results of the THz antenna will make a significant contribution to healthcare applications. The cancer treatment with THz is cheap, easy, and can be used without causing discomfort in patients.
Investigation of the Effects of Terahertz Ablation Treatment on Different Cancers
(Taylor & Francis Inc, 2025) Geyikoglu, M. Dilruba; Polat, Hilal Koc; Cavusoglu, Bulent; Ertugrul, Mehmet
Terahertz (THz) waves can overcome the side effects of traditional cancer treatment methods with their high absorption by water molecules and provide a new opportunity for the development of cancer treatment. In this study, the effect of a THz ablation system operating at 1.65 THz, recommended for use in cancer treatment, in the treatment of various cancers has been investigated. The proposed system includes three components to ensure high treatment achievement drive and electromagnetic compatibility. The first is a high-performance antenna that will generate radiation at 1.65 THz; the second is a rectangular waveguide that will direct the antenna radiation without loss; and the third is a compact pyramid-structure beam focusing apparatus that will increase focus. In silico studies were carried out for the treatment effects of the proposed system on breast, colon, and skin cancers. For terahertz ablation, treatment effects were examined using voxel data from eight people. Achievement drive parameters such as electric field, magnetic field, specific absorption rate, temperature, and tissue damage rate on healthy and diseased tissues were examined in detail. Our findings show that treatment temperature values have been reached with the THz ablation system depending on the exposure time and cancerous tissue location, and it has been determined that a high rate of tissue damage occurred. No unwanted secondary hotspots have been encountered during the treatment. Consequently, the therapeutic potential of the proposed THz wave ablation system on different cancers encourages further studies to determine the sensitivity and specificity of the system.
Reconfigurable Multifunctional Graphene-Based Antenna for Cancer Therapy with THz Wave Ablation
(Springer, 2023) Geyikoglu, M. Dilruba; Polat, Hilal Koc; Cavusoglu, Buelent; Ertugrul, Mehmet
In this article, a multifunctional THz antenna with reconfigurable frequency, polarization, and radiation pattern has been presented for use in cancer therapy. The antenna has been designed over a silicon dioxide (SiO2) substrate in which the E-shaped parasitic element is used symmetrically to control the current distribution, which determines the frequency range. The multilayer structure, non-radiating graphene ring, and graphene loads have been used for multifunctional reconfigurability. The graphene loads have been used for the creation of an electrostatic field effect by switching between metal and graphene on the main patch. In addition, the antenna performance parameters with increased Q factor have been strengthened by controlling the surface current of the antenna with graphene loads. The final antenna is 122.5% bandwidth in the range of 1.2-5 THz, and multi-polarization which is linear, circular, and elliptic polarization. The final antenna gain is increased up to 20.1 dBi, making it more attractive for therapy. Since radiation pattern orientation, high bandwidth, and circular polarization affect the treatment success rate in cancer treatment, a solution has been produced with an antenna with multifunctional reconfigurable properties. This antenna is aimed to be used in the treatment of cancerous tissue in the THz spectrum.