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.
Papers published on a yearly basis
Papers
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TL;DR: The aim of this study was to evaluate whether global system for mobile communication (GSM) cellular phones can affect the home monitoring (HM) function implemented in last generation pacemakers (PM).
Abstract: The aim of this study was to evaluate whether global system for mobile communication (GSM) cellular phones can affect the home monitoring (HM) function implemented in last generation pacemakers (PM).
Methods: We performed in vitro and in vivo tests on the BA03 PM (Biotronik GmbH, Berlin, Germany). In vitro we evaluated whether an improper HM procedure or an altered patient-activated HM function occurred. We used two cellular phone models, with a fixed external or internal antenna, positioned close to both the PM and the mobile phone-like device, during handover, ringing, and talking. All the tests were done with the PM in air, at 900 and 1,800 MHz GSM bands, under worst case conditions. A subset of these tests was repeated in 17 patients: the mobile phones were moved both around the PM implant site and the mobile cell phone-like device, during talking.
Results: In vitro, neither the HM procedure nor PM functioning were corrupted by the GSM communications: all the transmissions were correctly received, with a maximum transmission delay of about 110 seconds. In vivo, the rate of successful trasmissions was 93%.
Conclusion: Our data show that HM function does not call for specific restrictions on the use of GSM cellular phones.
39 citations
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01 Dec 2007TL;DR: In this article, a frequency selective surface (FSS) on modern day glass windows is proposed to improve the transmission of wireless/mobile/cellular communication signals through the glass.
Abstract: This paper reports initial work on creating frequency selective surfaces (FSS) on modern day glass windows to improve the transmission of wireless/mobile/cellular communication signals through the glass. The manufacturers of these glass windows apply very thin layers of metallic oxides on one side of glass to provide extra thermal insulation. These coatings block the infrared and ultraviolet waves to provide thermal insulation, but they also attenuate communication signlas such as GSM 900, GSM 1800/1900, UMTS and 3G mobile signals. This creates a major communication problem when buildings are constructed using mostly such type of glass. A bandpass FSS can provide a solution to increase the transmission of useful bands through the coated glass. In order to design an appropriate FSS, the relative permittivity and conductivity of glass should be measured accurately. Moreover, electrical properties of the coated layer must also be known in order to obtain a resonance in the desired band. In this work, we used two different methods of measuring the permittivity and conductivity of glass. Electrical properties of one of the common glass windows (Optithermtrade SN) are presented. Simulations of Optitherm glass shows about 35 dB transmission loss over 900-2200 MHz frequency band.
38 citations
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11 Jun 2000TL;DR: In this article, the authors describe two CMOS resistive ring mixer MMICs for GSM 900 and DCS 1800 base station applications, which have the lowest measured conversion loss (5.5 dB, 5.8 dB) and highest associated input IP3 (19.4 dBm, 19.5dBm).
Abstract: This paper describes two CMOS resistive ring mixer MMICs for GSM 900 and DCS 1800 base station applications. These mixers have the lowest measured conversion loss (5.5 dB, 5.8 dB) and highest associated input IP3 (19.4 dBm, 19.5 dBm) published to date for passive CMOS mixer MMICs in these frequency bands.
38 citations
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02 Jun 2002TL;DR: Measurements of the spectrum for the G SM modulated signal and of the demodulated signal show that the strict demands of the GSM specification can be met.
Abstract: This paper presents a fractional-N modulator architecture that uses the technique of two-point-modulation. This technique allows direct modulation of the VCO within the closed loop of a high resolution PLL based fractional-N frequency synthesizer, without restriction due to loop bandwidth and PLL dynamics. A prototype transmitter was implemented using the GSM standard to verify the superior performance predicted by simulation. The core element of this new modulator architecture is a PLL-based fractional-N frequency synthesizer. This prototype synthesizer consists essentially of a full custom IC for the analog section, and the digital functionality was implemented in a filed programmable gate array (FPGA). The analog circuitry was fabricated in a 25 GHz BiCMOS process with 0.8 /spl mu/m as minimum feature size. Measurements of the spectrum for the GSM modulated signal and of the demodulated signal show that the strict demands of the GSM specification can be met.
38 citations
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23 Dec 2013TL;DR: A complete system architecture of a textile-based rectenna loaded by a novel power management platform able to be autonomously activated by ambient RF energy harvesters, designed by microelectronic technology is introduced.
Abstract: In this paper we introduce a complete system architecture of a textile-based rectenna loaded by a novel power management platform able to be autonomously activated by ambient RF energy harvesters An integral design approach of the system blocks is carried out to provide the actual nonlinear behavior of the rectenna output, which is a function of the operating frequencies and power levels, as the DC-DC converter input The RF properties of the textile rectenna are computed by nonlinear techniques with textile materials and antenna layout numerically characterized by means of EM simulations A novel integrated power converter is adopted It is equipped with a start-up circuit and an energy storage unit and it is designed by microelectronic technology Energy autonomy of the entire system, including a battery-less activation is expected for RF available power levels as low as -15 dBm The system operation is computed with the wearable rectenna recovering RF energy upon user request from GSM 900, GSM 1800 and WiFi sources
37 citations