6 research outputs found
A Novel Cellular Handset Design for an Enhanced Antenna Performance and a Reduced SAR in the Human Head
This paper presents a novel cellular handset design with a bottom-mounted
short loaded-whip antenna. This new handset design is modeled and simulated
using a finite difference time-domain (FDTD)-based platform
SEMCAD. The proposed handset is based on a current commercially
available bar-phone type with a curvature shape, keypad positioned above the
screen, and top-mounted antenna. The specific absorption rates (SARs) are
determined computationally in the specific anthropomorphic mannequin
(SAM) and anatomically correct model of a human head when exposed
to the EM-field radiation of the proposed cellular handset and the handset
with top-mounted antenna. The two cellular handsets are simulated to operate at
both GSM standards, 900 MHz as well as 1800 MHz, having different
antenna dimensions and intput power of 0.6 W and 0.125 W,
respectively. The proposed human hand holding the two handset models is
a semirealistic hand model consists of three tissues: skin, muscle, and bone.
The simulations are conducted with handset positions based on the IEEE
standard 1528-2003. The results show that the proposed handset has a
significant improvement of antenna efficiency when it is hand-held close to head,
as compared with the handset of top-mounted antenna. Also, the results show that
a significant reduction of the induced SAR in the human head-tissues can be
achieved with the proposed handset
Anticipated Impact of Hand-Hold Position on the Electromagnetic Interaction of Different Antenna Types/Positions and a Human in Cellular Communications
This paper is intended to investigate intensely the impact of multipossible hand-hold positions
on the electromagnetic (EM) interaction of handset antennas and a human by using a finite-difference
time-domain (FDTD) method. Candy-bar handsets with different external and internal
antenna positions operating in the GSM900, GSM1800/DCS, and UMTS/IMT-2000 bands are
hereby simulated with configuration of the most parts in order to achieve the commercially
available handset model design. Homogeneous and heterogeneous phantoms both are used to
simulate the human head, whereas, a semirealistic model with three different tissues is designed
to simulate a human hand holding a set. Both of the antenna performance including the total
isotropic sensitivity (TIS) and the specific absorption rate (SAR) in tissues are examined for the
different suggested applicable cases, where various positions of antenna, handset and hand are
considered in simulations.
This simulation study determines that both of the antenna performance and the SAR in tissues
significantly alter owing to the positioning of the handset against user's head at different hand
levels; where a maximum alteration is observed due to the exposure of handset with internal
antenna, as compared with the handset having external antenna
Proceedings of First Conference for Engineering Sciences and Technology: Vol. 1
This volume contains contributed articles of Track 1, Track 2 & Track 3, presented in the conference CEST-2018, organized by Faculty of Engineering Garaboulli, and Faculty of Engineering, Al-khoms, Elmergib University (Libya) on 25-27 September 2018.
Track 1: Communication and Information Technology
Track 2: Electrical and Electronics Engineering
Track 3: Oil and Chemical Engineering
Other articles of Track 4, 5 & 6 have been published in volume 2 of the proceedings at this lin