Affiliations: [a] Space Science Centre, University Kebangsaan Malaysia, Bangi, Selangor, Malaysia | [b] Department of Electrical, Electronic and Systems Engineering, University Kebangsaan Malaysia, Bangi, Selangor, Malaysia | [c] Faculty of Information Science and Technology, University Kebangsaan Malaysia, Bangi, Selangor, Malaysia
Correspondence:
[*]
Corresponding author: M.I. Hossain, Space Science Centre, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor D.E., Malaysia. E-mail:[email protected]
Abstract: A new design and analysis of cellular
phone casing based on shielding technique is presented in this study to
reduce the EM absorption in the human head. A dual band PIFA is designed to
operate at 900 MHz and 1900 MHz GSM frequency bands as an internal handset
antenna. The specific absorption rate (SAR) in the human head and total
absorbed power by the cell phone user are calculated along with antenna
performances. It is found that the SAR in the head is reduced due to the
proposed casing considerably for both the lower and upper frequency bands.
The new mobile casing provides 48.2% reduction in the SAR at 900 MHz and
44.8% reduction at 1900 MHz. In addition, the mobile casing improves the
radiation efficiency for 6% and 7% in comparison with without casing
configuration at the lower and upper GSM frequency bands respectively.
Keywords: Antenna, EM absorption, mobile casing, head model, hand model, SAR
