The benefits of receiver antenna diversity in a Universal Mobile Telecommunications System (UMTS) handset were studied. Two different channel models were used, one an extension to the 3GPP multipath fading channels and the other based on 3-D scattering and angular weighting via a practically realisable antenna configuration. Simulated performance benefits arising from the use of a second receiv...

Abstract—In this paper, the interaction of a planar inverted-F antennas array, mounted on a mobile handset, with a human hand-head phantom is investigated in the 1.9GHz band. The hybrid approach involving the particle swarm optimization (PSO) and Nelder-Mead (NM) algorithm is considered to optimize the complex excitations of the adaptive array elements in a mutual coupling environment for diffe...

This paper proposes a multiband handset antenna combining PIFA and novel slots on radiating patch of PIFA for mobile applications. Two slots were introduced in order to embody 900 and 1800 MHz band. Radiation patterns are computed in free space as well as in the presence of head. Specific Absorption Rate (SAR) of slotted PIFA antenna is calculated and is compared with the SAR limits in the safe...

A two-element phased antenna array for a mobile handset is investigated using the Finite Difference Time Domain (FDTD) method. The array is designed to provide a spatial null in the near field zone in the direction of the human head. The optimisation algorithm to obtain the minimum peak specific absorption rate (SAR) is addressed. The dynamic range of the feeding voltages in relation to the red...

Maximum power feed efficiency of MIMO antenna with intensive mutual coupling on handset is achieved not by match or conjugate match source impedance configuration, but by the source impedance that introduces small reflection between the sources and the antenna network to reduce the power transmitted from the one source and absorbed by other sources. A novel model for calculating the absorbed po...

A novel fractal called Fractal Clover Leaf (FCL) is introduced and shown to have well miniaturization capabilities. The proposed patches are fed by L-shape probe to achieve wide bandwidth operation in PCS band. A numerical parametric study on the proposed antenna is presented. It is found that the antenna can attain more than 72% size reduction as well as 17% impedance bandwidth (VSWR<2), in co...

A frequency tunable planar inverted F antenna (PIFA) is presented for use in the following bands: DCS, PCS, and UMTS. Initially, the tuning was achieved by placing a lumped capacitor, with values in the range of 1.5 to 4 pF, along the slot of the radiator. The final tuning circuit uses a varactor diode, and discrete lumped elements are fully integrated with the antenna. The antenna prototype is...

In this paper, we designed and implemented an internal multi-band folded monopole antenna for mobile handset. The proposed antenna covers Global System for Mobile Communications (GSM900: 880~960 MHz), Digital Communications System (DCS: 1710~1880 MHz), USPersonal Communications Service (US-PCS: 1850~1990 MHz), Bluetooth(2400~2484 MHz), WiMAX(3400~3600 MHz), and Wireless Local Area Network (WLAN...

The electromagnetic radiation of a handset antenna to a human head model is rigorously analyzed by a new hybrid approach. In the analysis, human head is modeled by a double layered prolate spheroid with complex permittivity. A hybrid Null Field Method/Method of Moments (NFM/MoM) approach is proposed for the first time. The method is general and capable of dealing with multiple scatterers and ra...