Metamaterial vivaldi antenna array for breast cancer detection

The objective of this work is the design and validation of a directional Vivaldi antenna to detect tumor cells’ electromagnetic waves with a frequency of around 5 GHz. The proposed antenna is 33% smaller than a traditional Vivaldi antenna due to the use of metamaterials in its design. It has an excellent return loss of 25 dB at 5 GHz and adequate radiation characteristics as its gain is 6.2 dB at 5 GHz. The unit cell size of the proposed metamaterial is 0.058λ × 0.054λ at the operation frequency of 5 GHz. The proposed antenna was designed and optimized in CST microwave software, and the measured and simulated results were in good agreement. The experimental study demonstrates that an array composed with the presented antennas can detect the existence of tumors in a liquid breast phantom with positional accuracy through the analysis of the minimum amplitude of Sii.FCT national funds, under the national support to R&D units grant, through the reference project UIDB/04436/2020 and UIDP/04436/202

Design of biomedical passive RFID tag antenna

This work is devoted to the study and design of passive RFID tag antenna, this tag can be used in biomedical applications; Essentially for detection of the patient’s condition in a hospital. This study based on the electromagnetic simulation results, the proposed test is given by Computer Simulation Technology Microwave Studio (CST-MWS) based on finite integration technique (FIT) method. We propose a dipole tag antenna in the 2.4-2.48 GHz Industrial Scientific Medical (ISM) band that’s meant to be incorporated in a wristband of a patient. The wristband antenna in free space has a good results in terms of S11 (-33dB), gain (2.73dB), directivity (2.89dBi), bandwidth (5.3%) and efficiency (97%). In order to study the effect of the human body on the performance of the antenna, this wristband will be placed on a phantom arm. Despite the high losses introduced by the human tissue, the antenna shows a good S11 (-17.8dB), gain (1.31dB), directivity (4.06dBi), bandwidth (5.7%) and efficiency (49%)

Breast cancer detection based on CPW antenna

This work presents the design of CPW antenna for microwave tumor cell detection. The simulation results of the antenna performance in free space using CST-MWS are shown at 4.5 GHz. In order to study, the influence of the antenna movement on its electrical properties during breast cancer diagnosis, the CPW antenna is placed at a distance of 32 mm from the surface of the breast phantom with and without tumor cells by using different positions of the antenna to cover the entire breast surface and with various cross sections of the breast phantom. The tumor is represented by the sphere of diameter equal to 10 mm. In this paper, three interesting antenna parameters are analyzed, the return loss, the radiation pattern and the E-field inside the breast. This study shows good results to can detect the incidence of the tumor at 4 GHz. Comparing these results without and with tumor, it can be said that increasing the angle between the antenna and the breast phantom (from 0° to 60°), the return loss increases from -17 dB to -19.34 dB in 0°, from -15.37 dB to -19.28 dB in 30° and from -12.18 dB to -15.44 dB in 60°. The gain increases from 4.22 dB to 4.26 dB in 0°, from 1.13 dB to 1.2 dB in 30° and from 3.91 dB to 4.06 dB in 60°. In addition, to the increase of the e-field values inside the different cross sections of the breast phantom.(undefined

Electromagnetic study of the breast for biomedical applications

This work presents an electromagnetic test of the breast for biomedical applications. The test is given in the Industrial Scientific Medical (ISM) band where the frequency equal to 2.4 GHz. The simulation results of the electromagnetic aspects of the proposed test are given by Computer Simulation Technology Microwave Studio (CST-MWS) based on finite integration technique (FIT) method. The treated parameter for the immunity test of the breast is the Specific Absorption Rate (SAR). We propose four models of the breast phantom to obtain a comparative study in terms of the size effect and the thickness of different layers. The simulation results show that the immunity of the breast is depends to the Power energy and the breast size