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.

Method and device for dual-mode communication of GSM (global system for mobile communication) and PSTN (public switched telephone network)

Abstract: The invention is applicable to the technical field of communication, and provides a method for dual-mode communication of GSM (global system for mobile communication) and PSTN (public switched telephone network) and device for the dual-mode communication of GSM and PSTN. The method comprises the following steps: obtaining a current working mode; judging the current working mode; if it is a GSM mode, controlling a GSM module and sending a prompt message to an output module; if it is PSTN mode, controlling a PSTN module to send an off-hook instruction to the GSM module, and controlling the GSM module to send the prompt message to the output module; obtaining a user instruction, and connecting with the communication network under the current working mode according to the user instruction. The dual-mode communication of GSM and PSTN is realized; the GSM and the PSTN can be flexibly switched, the PSTN network utilization rate is improved, and cost is reduced.

Printed Antenna Design for LTE Mobile Applications

Abstract: The compact Planar Monopole antenna is proposed for the multiband application. The antenna is constituted of meandered shape which assists to achieve multiband frequency. The antenna is fabricated on dimensions of 118 x70x1.6mm3 using glass epoxy FR4 (er =4.4) substrate. The antenna optimized for GSM 900 MHz, 1800 MHz, LTE 2300 (2.3 GHz to 2.4 GHz) and LTE 2600 (2.6GHz), using Altair FEKO 14.0 EM simulator. The proposed antenna is a compact antenna and furnish space for other RF circuits with respect to other proposed LTE antenna. The proposed antenna depicts good impedance matching, high gain, and radiation efficiency over the desired frequency band of interest.

Design and Construction of Helical Antenna in GSM 900

Abstract: Global System for Mobile Communication (GSM) is the most popular system used for mobile telecommunications especially in Europe and Asia. The critical success factors in GSM depends on the BTS (Base Transceiver Station) coverage, however in certain areas the signal is so weak and the communication can be lost. To solve this problem an additional antenna can be used on the user's side (mobile station) which is able to increase the received signal level. In this research, Helix antenna with variation of turn has implemented to be an aditional antenna in mobile device. The Helical antenna was designed on the 900 MHz which is known as GSM 900. The antenna was measured in order to obtain some parameters such as operating frequency, bandwidth, VSWR, gain, radiation pattern and HPBW. The measured results show that Helix antenna resonates at frequency 900 MHz with VSWR 1.09, bandwidth 50 MHz and HPBW 400. The qualitative test by implementing the Helix antenna directly connected to the GSM modem shows that the received signal level can increase about 6 dB.

Dual Band Monopole Antenna with Concentric Square Electromagnetic Band Gap (EBG) Structure

Abstract: In this Paper, a Dual Band Monopole Antenna has been presented for GSM 900 and Wi-Fi band. To improve the performance parameters of the antenna, concentric square shaped electromagnetic band gap (EBG) structure has been incorporated. FR4 substrate is used and the proposed antenna is fed by line feed technique. The outer cell of $6.8533^{\ast}6.8533\text{mm}^{2}$ has been designed for GSM 900 band and inner cell of $2.557^{\ast}2.557\text{mm}^{2}$ is tuned to Wi-Fi band. The structure without EBG, reported a gain of 6.1928dB and 5.72499dB for GSM 900 band and Wi-Fi band respectively. The return loss of - 16.36116dB and -14.12084dB was obtained for GSM 900 and Wi-Fi band correspondingly. Introducing a concentric square EBG cells, the gain of 6.3391dB and 7.1013dB is obtained for GSM 900 and Wi-Fi bands individually. Return loss of the antenna is also improved for both the bands which makes the proposed antenna suitable for GSM and Wi-Fi applications.

Design Rectangular Microstrip Patch Antenna for GSM 900 and GSM 1800 Base Station

Abstract: In this work the proposed antenna is designed to operate at GSM 900 and GSM1800 base station applications. The construction of the microstrip antenna consists of rectangular patch with rectangular slot putting at the top of the patch. The isolation layer that is used for this design is FR-4 substrate with relative permittivity ($\varepsilon_{r}=4.3$) and thickness is (1.6mm), conduction layer is copper with thickness is (0.035 mm). The effect of changing the parameters of the antenna and choose the best values has been studied by using the CST microwave studio suit version 2014. The proposed antenna operates from 0.94 GHz to 1.9 GHz and offers the gain from 2.11dB to 4dB, with acceptable antenna performances such as radiation patterns and gain.