Topic
GSM frequency bands
About: GSM frequency bands is a research topic. Over the lifetime, 559 publications have been published within this topic receiving 5067 citations.
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16 Dec 2015
TL;DR: The results of the SAR (Specific Absorption Rate) measurements for a mobile phone EUT (Equipment under Test) that works on the GSM 900 and 1800 bandwidths are presented to compare these results with current standards and to extract practical conclusions of the way in which the authors must protect ourselves from electromagnetic radiation.
Abstract: The reason for this study is to present the results of the SAR (Specific Absorption Rate) measurements for a mobile phone EUT (Equipment under Test) that works on the GSM 900 and 1800 bandwidths, to compare these results with current standards and to extract practical conclusions of the way in which we must protect ourselves from electromagnetic radiation. In order to accomplish the experiment, special equipment and specific software for these measurements were used. This equipment is meant to simulate human tissue and real conditions for the mobile phone to work.
Patent•
31 May 1999TL;DR: In this article, the interface protocols are arranged in GSM mode interface standards, using a radio interface (1A) and a first layer specifying the code division multiple access transmission and the other layers of the radio interface speifiying the other functions.
Abstract: The interface protocols are arranged in GSM mode interface standards, using a radio interface (1A) and a first layer specifying the code division multiple access transmission and the other layers of the radio interface speifiying the other functions.
03 Dec 2001
TL;DR: In this article, a 4-element array with unequal spacing was studied, where the array elements were fed by an L-probe and the array was resonant at the center frequency 900 MHz, the GSM band.
Abstract: A 4-element array with unequal spacing is studied in this paper. The array elements are fed by an L-probe. The array is resonant at the center frequency 900 MHz, the GSM band. The wideband properties of the L-probe gives the bandwidth of the array within the GSM 900 MHz band (870 MHz /spl sim/ 960 MHz) with the SWR /spl les/ 1.5 from 845 MHz to 980 MHz (14.8%). Due to the unequal spacings of the array elements, an asymmetrical radiation pattern is obtained. The upper sidelobe is suppressed, as required in mobile communication. The back lobe radiation reduces by adding 4 vertical walls on each edge of the ground plane.
07 Sep 2021
TL;DR: In this article, a dual-band metamaterial absorber is proposed for RF energy harvesting in the GSM band, which has very high absorption values (close to 100%) and operates at the 900/1800 MHz frequency bands.
Abstract: A major challenges in today’s low-power electronics for smart environments is given by self-sufficient operation. Most low-power electronic devices, such as sensors and portable devices, operate with long-lasting and non-rechargeable batteries, leading to very high maintenance costs. RF energy harvesting could offer a valid alternative to supply low-power devices, eliminating the need to replace batteries. In this paper, a metamaterial-based harvester is proposed for radio frequency energy harvesting within the GSM band. A dual band metamaterial absorber, having very high absorption values (close to 100%) is designed to operate at the 900/1800 MHz GSM frequency bands. The proposed design is very appealing for future implementations of RF energy harvesting from environmental GSM signals.
19 Sep 2018
TL;DR: In this article, a novel investigatory method for specific absorption rate (SAR) assessment on human tissues such as kidney, heart, lungs, trachea, and nerve was proposed.
Abstract: The human exposure assessment is dependent on the measurement parameter such as Specific Absorption Rate (SAR). SAR investigation highlights the biological impact of human health due to a radiation source. This paper proposes a novel investigatory method for SAR assessment on human tissues such as kidney, heart, lungs, trachea, and nerve. The radiation source is considered is Inverted F Antenna designed to operate at GSM frequency 900 MHz. The tissue structures are designed with equivalent properties. The experimental analysis of exposure on tissues is performed, and SAR is computed. The various response of tissues towards SAR is compared and analyzed with gain and operation characteristics.