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Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Proceedings of the 2012 International Conference on Communications, Devices and Intelligent Systems, CODIS 2012 | Year: 2012

Segmented Finite Difference in Time Domain (SFDTD) method has been applied to carry out investigation at the frequency range from 500 MHz to 3.5 GHz on a pair of half wave resonant dipole antennas of each having length equal to 14.5 cm and separated by a distance of 20.0 cm placed in free space. One of the antennas is acting as a Transmitter (Tx) while the other as a Receiver (Rx). The objective of this study is to obtain scattering parameters S11 and S21 of Tx-Rx pair using SFDTD method and compared that with FDTD and IE3D methods. Comparison shows a good agreement of the results obtained by SFDTD method with that of FDTD and IE3D methods. © 2012 IEEE. Source


Ali Md.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
2012 National Conference on Communications, NCC 2012 | Year: 2012

Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to calculate Specific Absorption Rate (SAR) induced in the head and hand for a handheld mobile phone. Both the head and hand are modeled using Digital Imaging and Communication in Medicine (DICOM) based anthropomorphic phantom voxel data considering the electrical parameters of different anatomical internal structures of the human head and hand. SAR values obtained using DICOM based voxel model are compared with that obtained using Zubal phantom based model to verify the suitability of the proposed method. The proposed method can be used for person specific real time simulation of SAR. © 2012 IEEE. Source


Ali M.F.,Nazrul Centenary Polytechnic | Belamgi S.B.,Jadavpur University | Ray S.,Jadavpur University
Microwave Review | Year: 2015

Now-a-days researchers are very much concerned to evaluate Specific Absorption Rate (SAR) at different human organs due to the Electromagnetic (EM) wave radiation coming from cell phone antennas or other wireless communication devices at radiofrequency (RF). But, the time has come to change the vision slightly toward the effect of RF on agricultural field and plant kingdom. The purpose of this paper is to study the effects of RF radiation coming from Base Station Antennas (BSAs) on a Money plant. In this work, the radiation coming from a 2.4 GHz base station at the occupational and general public exposure levels prescribed by ICNIRP have been taken into consideration and then SAR induced inside a Money plant has been calculated. Shielding effectiveness (SE) provided by the Money plant has been experimentally measured and calculated in the frequency range of 2.35 GHz to 3.0 GHz. Maximum value of Local Point SAR at 2.4 GHz induced inside the Money plant for occupational and general public exposure levels are found to be 9.50 W/kg and 1.88 W/kg respectively. Whereas, Maximum value of SE obtained by the simulation and measurement are found to be 9.48 dB and 9.01 dB respectively. Source


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Progress In Electromagnetics Research C | Year: 2014

Electromagnetic (EM) wave absorption characteristics for a Bonsai tree are investigated at GSM-900 band. Finite Difference in Time Domain (FDTD) method is hybridized with Friis transmission equation to carry out all the required EM simulations. The tree has been modelled using CT scan based 3D dataset considering different electrical parameters. Maximum local electric (E) field, magnetic (H) field, Specific Absorption Rate (SAR) and Shielding Effectiveness (SE) have been calculated for the tree placing at distance of 5m away from a radiating Base Station Antenna (BSA) with 20W input power. The maximum local E field, H field, 1-g SAR and SE obtained by the simulation are found to be 70.1 V/m, 0.09 A/m, 0.135 W/kg and 13.18 dB, respectively. Plants are found to be good natural electromagnetic radiation shield. Source


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Progress In Electromagnetics Research M | Year: 2014

Electromagnetic wave absorption inside a human body is investigated. The human body has been modeled using 3D voxel based dataset considering different electrical parameters. At GSM 900 band, Specific Absorption Rate (SAR) induced inside the human body model exposed to a radiating base station antenna (BSA) has been calculated for multiple number of carrier frequencies and input power of 20 W/carrier. Distance (R) of human body from BSA is varied in the range of 0.5m to 5.0 m. Values of whole-body average SAR obtained by hybrid FDTD method closely match with that obtained by SFDTD method. For number of carrier frequency equal to five and R = 0:5 m, maximum value of whole-body average SAR obtained by both hybrid FDTD and SFDTD method is found to be 0.69 W/kg which decreases either with increase of R or decrease of number of carrier frequencies. Safety distance for general public is found to be 1.5m for number of carrier frequencies equal to five. Summary of performance comparison shows that hybrid FDTD method is faster and requires less memory than SFDTD method. © 2014, Electromagnetics Academy. All rights reserved. Source

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