The emergence of mobile terminals operating at millimeter-wave frequencies necessitates the ability to evaluate effect environment, and in particular, users have on their radiation properties. Some studies evaluated shadowing effects a hand or an entire body for simple antenna configurations. This letter proposes method reliably predicting performance different array geometries presence when th...

This paper described the analysis and design of a square spiral Microstrip. The spiral is formed by introducing slot in a square patch. This spiral design is introduced to use a single structure for dual band/frequency operations by adding tuning elements. The design parameters for a rectangular patch antenna have been calculated from the transmission line model and using MATLAB. The simulation...

The development of a small electrical antenna plays an important role in the rapidly growing mobile communication market. This paper presents the design of a novel small and wideband planar inverted F-antenna that simultaneously covers the GSM900/GPS/ DCS1800/DCS1900/IMT2000/WLAN/DMB service bands. A very wide impedance-bandwidth characteristic was achieved by optimizing both the distance betwe...

This paper presents a new methodology of the over-theair (OTA) assessment for vertically arranged multiple-input multiple-output (MIMO) array antennas. Particular emphasis is placed on how well handset MIMO antennas with a vertically arranged structure are characterized using the limited number of scatterers implemented in a fading emulator. First we studied the mechanism of the arrangement of ...

This paper presents a cluster-based feature transformation technique for telephone-based speaker verification when labels of the handset types are not available during the training phase. The technique combines a cluster selector with cluster-dependent feature transformations to reduce the acoustic mismatches among different handsets. Specifically, a GMM-based cluster selector is trained to ide...

This paper assesses radio frequency exposure of a mobile handset user in the context of a new class of cellular base station: the femtocell. Traditional cellular network construction relies on using a single base station to cover a large area and serve dozens to hundreds of users. The femtocell (named after the minuscule size of the coverage area) provides a low-power in-home cellular connectio...

A method is described for designing speaker recognition features that are robust to telephone handset distortion. The approach transforms features such as mel-cepstral features, log spectrum, and prosody-based features with a non-linear arti®cial neural network. The neural network is discriminatively trained to maximize speaker recognition performance speci®cally in the setting of telephone han...

This paper proposes remote vehicle diagnostic system with handset, which has same functionality of conventional scanner, automobile diagnosis device. It consists of remote server, mobile handset application and a connecting device. Remote server has vehicle diagnosis database. Mobile handset application relays automobile signals and controls the flow of data packets. Using connecting device, us...

The performance of a cellular phone commercial helical antenna at 900 MHz band, both in free space and in the presence of a human head phantom was studied. Numerical simulation of the phone model for the latter case has been performed giving 3D radiation diagrams. The effect of the phantom head on radiation diagrams is presented. The relative amount of the EM power absorbed in the head was obta...