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• W852582 abstract "The big proliferation of mobile communication systems has caused an increased concern about the interaction between the human body and the antennas of mobile handsets. In order to study the problem, a multiband antenna was designed, fabricated and measured to operate over two frequency sub bands 900 and 1800MHz. After that, we simulated the same antenna, but now, in the presence of a human head model to analyze the head's in∞uence. First, the in∞uence of the human head on the radiation e-ciency of the antenna has been investigated as a function of the distance between the head and the antenna and with the inclination of the antenna. Furthermore, the relative amount of the electromagnetic power absorbed in the head has been obtained. In this study the electromagnetic analysis has been performed via FDTD (Finite Difierence Time Domain). 1. INTRODUCTION The cellular phone market has increased substantially during the last decade. The global com- mercial success of GSM has driven a great variety of cellular mobile radio systems. Along with market growth the possible risks related to the use of cellular phones have become an issue. A lot of research studies have been carried out based on this interaction (1{3), dealing generally with two aspects. The flrst aspect is the mobile phone antenna in∞uence on the human body in particular on the head. In fact, when a cellular phone works, the transmitting antenna is placed much closed to the user's head where a substantial part of radiated power is absorbed. It's important to characterize and quantify the distribution of the electromagnetic flelds and the energy levels absorbed by the human tissues. In order to characterize the absorbed radiation by the human body, we use the Speciflc Absorption Rate (SAR) that represents the levels which is absorbed by a mass unit of tissue. The second aspect is the in∞uence of the user's body on radiation properties of the mobile phone, which is signiflcant from the antenna design point of view. Antenna characteristics that are mostly afiected by the presence of the human body are radiation pattern, input impedance and radiation e-ciency (4). The presence of the human body (and more speciflcally of the head) close to the handset causes generally degradation of its performance in comparison with the operation of the handset alone. The measure of this performance is the radiation e-ciency of its antenna. 2. ANTENNA FOR GSM 900/1800 In this work, numerical simulations and measurements of a multi band antenna is presented for GSM 900/1800MHz. The antenna was designed and simulated with the FDTD (6,7), and a prototype of the flnal version was fabricated and measured. To obtain an antenna with two resonances we used a single U slot patch antenna (5) with two short pins, as shown in Figure 1. In the same flgure, the radiation pattern of the antenna for 1800MHz is presented. 3. INFLUENCE OF THE HUMAN HEAD IN THE RADIATION PROPRIETIES OF THE ANTENNA" @default.
• W852582 created "2016-06-24" @default.
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• W852582 date "2009-01-01" @default.
• W852582 modified "2023-09-23" @default.
• W852582 title "Influence of the Human Head in the Radiation of a Mobile Antenna" @default.
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