Abstract
In this paper, the simulation studies of the radiation characteristics of modified dual segment rectangular dielectric resonator antenna (DSRDRA) in free space and in presence of bio-medium alongwith the absorbed power distribution in a homogenous bio-medium (muscle layer) in direct contact with the proposed antenna are reported at different WiMAX band frequencies. The specific absorption rate (SAR) distributions in muscle layer for different antenna-to-muscle layer spacings are also presented at resonant frequency of antenna in WiMAX bands. The results of return loss, input VSWR and radiation characteristics of proposed antenna in bio-medium are also compared with results in free space. The simulation study has been carried out using CST Microwave Studio software.
Highlights
The proliferation of wireless portable devices and greatly increased amount of electromagnetic radiation in the environment from these devices are making the public aware of the possible health risks of wireless portable devices
The simulation studies of the radiation characteristics of modified dual segment rectangular dielectric resonator antenna (DSRDRA) in free space and in presence of bio-medium alongwith the absorbed power distribution in a homogenous bio-medium in direct contact with the proposed antenna are reported at different WiMAX band frequencies
The return loss and input impedance versus frequency characteristics for the proposed antenna in free space and in direct contact with bio-medium has been carried out using CST Microwave Studio software
Summary
The proliferation of wireless portable devices and greatly increased amount of electromagnetic radiation in the environment from these devices are making the public aware of the possible health risks of wireless portable devices. It is of interest to evaluate the power absorbed/specific absorption rate (SAR) distribution in the body tissues due to wireless device antenna radiating electromagnetic waves [2]. As strong interrelation exists among different parameters of dielectric antenna including its size, configuration, dielectric constant, bandwidth, near field distribution and far field pattern; these parameters will affect specific absorption rate (SAR) distribution in a bio-medium located close to the antenna. For wider-band applications, DRAs having lower dielectric constant values are preferred The radiation characteristics of the proposed antenna and the SAR distributions in a homogeneous bio-medium (muscle layer) for different antenna-to-bio-medium separations of 0 cm, 5 cm, 10 cm and 20 cm at resonant frequency of antenna are studied through simulation using CST Microwave Studio software. The results of return loss and radiation patterns of proposed antenna in free space are compared with results of antenna in direct contact with the bio-medium
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