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.

Performance Evaluation of Rectangular Microstrip Patch Antennas Loaded with Plastic and Barium-Titanate Substrates at GSM 1800 MHz Band

Abstract: In this paper, the resonance and radiation characteristics of patch antennas fabricated with two different types of dielectric substrates have been investigated and compared at GSM 1800 MHz band At first, the above-stated characteristics of a patch antenna loaded with conventional plastic substrate have been investigated Later a high permittivity dielectric material (barium titanate) has been used as the antenna substrate The main goal here is to reduce the antenna size with a high permittivity dielectric material and then to compare its resonance and radiation performance with the earlier low permittivity substrate loaded prototype It is found that with the use of high permittivity substrate the antenna volume gets smaller (about 6% of the plastic substrate prototype) although the gain decreases by around 25 dB

Hazard estimation from Radiofrequency Radiation in a Nigerian Teaching Hospital from nearby GSM Base-Stations

Abstract: Increasing competition between GSM service providers and several calls for improvement of their quality of service from members of the public has led to proliferation of base station (BTS) masts in Nigeria. Consequently, there is an increase in the risk of radiation hazard due to exposure of the public to radiofrequency radiation from the BTS antennae. This study is aimed at estimating the radiation hazard due to electric field intensity from BTSs.Electric field intensity measurements due to different GSM Operators were taken at thirty sites in the 900MHz and 1800MHz frequency bands. The maximum instantaneous electricfield intensities of 301.05 ± 63.85mV/m and 241.49 ± 57.00mV/m were obtained for GSM900 and GSM1800 respectively. Estimation of the specific energy absorption rate (SAR) yield 39.00μW/kg and 34.80μW/kg for the skin, while that of the brain yield 33.90μW/kg and 32.70μW/kg for GSM 900 and GSM 1800 respectively. The skin penetration depth for the worst case of exposure was obtained as 4.16cm. Exposures in the study area are below the ICNIRP reference level.

Broadband dual-polarized antenna unit and broadband antenna

Abstract: The invention relates to a broadband dual-polarized antenna unit which is arranged on a metal reflective board, and comprises two pairs of polarized dipole radiation units orthogonally arranged, each dipole radiation unit is arranged on the metal reflective board by a balun, and the positions where the dipole radiation units are connected with the balun are in the same one reference plane; each dipole radiation unit comprises two unit arms symmetrically fixedly arranged on the balun, one ends of the unit arms are fixedly connected with the balun, and the other ends of the unit arms are provided with board like pieces perpendicular to the reference plane; and projections of the unit arms on the reference plane enclose a centrosymmetric polygonal or circle. The broadband dual-polarized antenna unit is simple in structure, easy to manufacture, and suitable for batch production, has the advantages of high performance and broadband, and is especially applicable to mobile communication systems of GSM (Global System For Mobile Communication) 800, GSM 900, CDMA (Code Division Multiple Access) 800, LTE (Long Term Evolution) 700 and the like with 600-1000MHz.

Fast, handset-based GSM fingerprints for indoor localization

Abstract: Accurately localizing users in indoor environments remains an important and challenging task. The article presents new results on room-level indoor localization, using cellular Received Signal Strength fingerprints collected with a standard cellular handset programmed to perform fast scans of the 900 and 1800 Megahertz GSM bands as a user explores an indoor environment at a normal walking pace. Support Vector Machines are used to deal with the high dimensionality of the fingerprints. The study demonstrates that an appropriately programmed standard cellular handset can provide a simple, inexpensive solution for accurate room-level indoor localization.

Experimental Investigation of GSM 900 MHz Results Over Northern India with Awas Electromagnetic Code and Other Prediction Models

Abstract: Recent trends in propagation modeling indicate the study of mobile radio propagation modeling with the help of electromagnetic formulations which traditionally has been explained with empirical methods. These empirical methods were preferred by the cellular operators in their radio planning tools due to their ease of implementation and less time consumption. In the present study, AWAS electromagnetic code and conventional prediction methods have been employed to explain the observed results of ten base stations mainly in the near fleld zones of GSM 900MHz band situated in the urban and suburban regions around Delhi in India. The suitability of the above models in terms of prediction errors and standard deviations are presented. Path loss exponents deduced from the observed data have been explained by Sommerfeld's formulations.