Measurement of Specific Absorption Rate (SAR) in the Frequency Band of 2.4 GHz
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Abstract
This paper presents the measurement of specific absorption rate (SAR) in the frequency band of 2.4 GHz. This research consists of a receiving antenna, a RF amplifier, a rectifier and an Arduino board. A radiating patch of the antenna is surrounded by an electromagnetic band gap structure, in order to suppress surface wave propagation. Resulting in a narrow half-power beam width (HPBW) of the antenna. As a result, the proposed antenna can provide more accurate positioning for SAR measurements. The proposed antenna structure has dimensions of 202×202 sq.mm, fabricated on an FR-4 substrate with a dielectric constant of 4.3 and thickness of 1.6 mm. In addition, the measured |S11| of -34.17dB at 2.45GHz frequency, the HPBW of 61.8 and 60.9 degrees in XZ and YZ planes, respectively. A signal received from the proposed antenna is fed to the RF amplifier and the rectifier circuits, to amplify the signals and they are converted to voltage. After that, they are fed to the Arduino board, to calculate the SAR values and display they on the LCD screen.
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