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.

Hand-over testing method and testing apparatus

Abstract: PROBLEM TO BE SOLVED: To implement a hand-over test in a GSM (global system for mobile) communication system. SOLUTION: In the hand-over testing method for implementing the hand-over test between GSM base stations by sending a GSM test signal in which a frequency of each slot is changed to a mobile terminal which communicates with a GSM base station by using the GSM communication system, in response to a GSM frequency change request designating the frequency of a slot in the GSM test signal, within a frame to which the GSM frequency change request is inputted, set frequency data for obtaining the designated frequency and set attenuation quantity data for obtaining a predetermined output signal level are calculated. Afterwards, synchronously with the slots in a frame next to the frame to which the GSM frequency change request is inputted, the calculated set frequency data and set attenuation quantity data of the relevant slot are set to a carrier generating circuit and an attenuator in a test signal generating part. COPYRIGHT: (C)2004,JPO

Coupled-fed PIFA with a loop feed for 8-band internal LTE/WWAN laptop computer antenna

Abstract: Owing to the LTE (long term evolution) which can provide much higher data rate than the existing GSM and UMTS mobile networks, the internal antenna that can cover LTE/WWAN operating bands is preferred for the modern mobile communication device. All the 8-band LTE/WWAN operating bands include: three LTE bands in the LTE700 (698~787 MHz), LTE2300 (2300~2400 MHz) and LTE2500 (2500~2690 MHz), four GSM bands in the GSM850 (824~894 MHz), GSM900 (880~960 MHz), GSM1800 (1710~1880 MHz) and GSM1900 (1850~1990 MHz), and one UMTS band (1920~2170 MHz). Although there are some small-size 5-band WWAN laptop computer antennas published [1]-[5], they generally cannot satisfy the 8-band LTE/WWAN operation. In this paper, we present a promising internal laptop computer antenna with an acceptable size of 80 × 10 × 4 mm3 for practical applications. The proposed antenna is a coupled-fed PIFA with a loop feed; it can generate two wide resonant modes in the lower and upper bands to cover the desired 8-band LTW/WWAN operation.

Indoor to outdoor propagation model improvement for GSM900/GSM1800/CDMA-2100

Abstract: This paper presents a modified indoor to outdoor propagation model based on empirical techniques. The proposed model improves the accuracy of the COST 231 model [8] and valid for GSM 900, GSM 1800 and CDMA 2100. While generated model deviates from measurements by at most 8dB, theory and measurements are in good track. Generated model includes building structures as well as frequency dependence.

A Compact Tri-Band PIFA with Multiple-Folded Parasitic Elements

Abstract: The application of the multiple folded structure to a compact tri-band PlFA (planar inverted-F antenna) composed of three resonant frequencies, GSM (880-960 MHz) / DCS1800 (1710-1880 MHz) / Satellite DMB (2605-2655 MHz), are treated with the optimized parameter values. The proposed antenna has been designed and analyzed by using commercially available software, CST MWS based on the FDTD algorithm and a simple resonant equation, respectively. In addition, the return loss has been measured and compared between measured and simulated data under the criterion of VSWR less than 3.

On -vehicle receiving antenna of big dipper GPS

Abstract: The utility model discloses an on -vehicle receiving antenna of big dipper GPSGSM, including antenna main part, antenna array, signal transmission line, the coaxial symmetry of antenna array sets up in the casing both sides of antenna main part, and the line length between the both ends in the antenna array outside is the fourth of GSM frequency wavelength, signal transmission line perpendicular to antenna array axial sets up, and wherein, antenna array includes copper post, spring, and the one end of copper post sets up draw -in groove and back -off, and the spring is fixed through the back -off in emboliaing the draw -in groove, the GSM antenna includes antenna array, signal transmission line, and antenna array symmetry sets up in antenna shell's both sides, and signal transmission line and antenna array are connected. The problem of two antennas increase the space -occupying volume, lead to the wiring construction complicated is solved, eliminated and come fixed drawback with the welding between copper post and the spring, and can exert the effect of big dipper GPS antenna and GSM antenna simultaneously, reduced space and mould utility.