Event Details
Modeling of Dual-Band Handset Antennas in the Proximity of User's Head
Presenter: MD. Mizanur Rahman
Supervisor:
Date: Wed, April 25, 2001
Time: 11:00:00 - 12:00:00
Place: EOW 230
ABSTRACT
Abstract:
Due to the enormous growth of the cellular communications over the past decade efficient utilization of the frequency spectrum has become necessary. The frequency bands allocated for personal communication in North America are: 824-894 MHz and 1850-1990 MHz. Hence a dual-frequency antenna is needed for hand-held telephones. In this seminar two dual-band antennas for handsets are presented. The antennas are sleeve-monopole and dual meander-sleeve. First, a description of the antennas are given. Next, antenna performances in free space and in presence of the user's head are presented and explained. Performance of the antennas is evaluated in terms of impedance bandwidths, and far-field radiation patterns. The talk also addresses the issue regarding the radio frequency (RF) fields absorbed in the user's head and compliance of the hand-held devices with existing safety standards. The data regarding the specific absorption rate (SAR) of radiated energy within the user's head from the designed antennas are presented and compared with the recommended safety standards.