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.

Multiband monopole S patch antenna used for GSM, WiMAX and other wireless applications

Abstract: In this letter, the proposed antenna has four frequency bands centered at 0.98, 2.8, 3.7, 4.7 GHz and has very a compact size of 30*40*1.57mm3 including the ground plane and the above patch. Array of I slots are cut into ground plane of different lengths and S shape is cut into patch. Proposed antenna has-10dB impedance bandwidth of 1006 MHz (0.87–1.93GHz), 600MHz (2.54–3.14GHz), 300MHz(3.6–3.9GHz), 300 MHz(4.5–4.8GHz) which covers GSM bands, WiMAX and other wireless application. Fabricated prototype is also presented which has return loss of 8.42 dB at 1.70 GHz, 11.80dB at 4.247 GHz and 24.90 dB at 5.108 GHz. E plane and H plane radiation pattern are shown.

INTERNATIONAL JOURNA L OF ENGINEERING SCI ENCES & RESEARCH TECHNOLOGY Analysis of Automatic Aircraft Landing Using G SM Transmitter and Receiver

Abstract: Correct aircraft operation, depends upon the proper functioning of airport lighting circuits. The failure of even a single lamp, may well imply, the loss of the visual aid for the pilot and it can result in sabo tages while landing. This project deals with the individual det ection of any open circuit between two successive f ittings. This i achieved by placing a simple non contact AC voltage detector over the insulated 5kV line and transmitt ing the output logic to the control room through GSM technology. The voltage detector picks up the hum of AC v oltage, decade counter. During open circuit, absence of lin e voltage makes the last count to be stable, which is picked up by a microcontroll er, which in turn activates GSM transmitter to tran smit the desired message to the control room GSM receiver. This system h as a major advantage that it needs no extra under l ying of cables near runway and GSM frequency which doesn't affect RADAR and other communication frequencies and also independent of distance. Also it requires no p hysical connection between CCR and also to And over all, it is the most cost efficient system introduced so far.

The Number Continuity Service: Part II – GSM CDMA Seamless Technology Change

Abstract: Even with the predominance of the GSM technology, there are instances when the only coverage for a GSM outbound subscriber is from a CDMA (IS-41) network (that includes many fixed networks in the USA and the CDMA based Globalstar satphone services). Symmetrically a CDMA subscriber roaming in a GSM network after changing for a GSM handset, will need the number continuity service to receive his calls and SMS. Roaming Hubs able to convert the two signalling systems are required. We explain the differences into the mobility protocols (MAP GSM and MAP IS-41), the TCAP protocol (ANSI and ITU) and the network layers (14 bits ITU and 24 bits ANSI Point Codes). The eight possible combinations are handled by a multi-standard Roaming Hub architecture. Detailed protocol traces are included.

Dual GSM/enhanced GSM mode radio telephone station having selection mechanism recognizing received signal radio type and selecting mode.

Abstract: The radio telephone station communicates with two mobile radio modes There is a mode selection mechanism (6) which recognizes the type of radio signal received and selects that mode (66)

Multiband antenna arrangement for different frequency ranges has two antennae, one is for GSM frequency band and other for WLAN frequency band whereby second antenna has frequency filter and its length is compatible with GSM frequency band

Abstract: The arrangement (14), which is mechanically supported by a carrier (17), has one antenna (1) for GSM frequency band and second antenna (2) for WLAN frequency band. Second antenna has a both-way open slot (7) as frequency filter (6) which separates it into two antenna parts (4,5) and its length is compatible with GSM frequency band. An independent claim is also included for a send-receive-unit particularly a PC-card.