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...

The tunable characteristics of RF MEMS (Microelectromechanical Systems) components enable their integration with antennas providing numerous advantages such as reconfigurability in polarization, frequency, and radiation pattern [1]. Furthermore, the monolithic fabrication of these components with antennas can reduce parasitic effects, losses and costs. This paper presents two tunable frequency ...

Solar energy represents one of the most important renewable sources contributing to transition process. Considering that observation daily global solar radiation (GSR) is not affordable in some parts globe, there an imperative need develop alternative ways predict it. Therefore, main objective this study evaluate performance different hybrid data-driven techniques predicting GSR semi-arid regio...

Introduction: Miniaturisation of RF devices is very important for development in the next generation of wireless communication systems. The size reduction technique must be applied not only to the RF circuit but also to the antenna. The size of antenna is the most difficult parameter to reduce. The quality of antennas can be evaluated using the quality factor Q. This quantity of practical inter...

Radiative forcing (RF) of black carbon (BC) in the atmosphere is estimated using radiative transfer codes of various complexities. Here we show that the two-stream radiative transfer codes used most in climate models give too strong forward scattering, leading to enhanced absorption at the surface and too weak absorption by BC in the atmosphere. Such calculations are found to underestimate the ...

The tuning and matching conditions of rf circuits, as well as the properties of the transmission lines connecting these to the preamplifier, have direct consequences for NMR probe sensitivity and as for the optimum delivery of rf power to the sample. In addition, tuning/matching conditions influence radiation damping effects, which manifest themselves as fast signal flip-back and line broadenin...

Active mode locking of the far-infrared p-Ge laser has been achieved in the Faraday configuration of electric and magnetic fields applied to the laser crystal. The laser generates 200 ps pulses of 80–110 cm radiation with a laser-cavity roundtrip frequency of 454 MHz. The mechanism of gain modulation by the external rf electric field is based on induced electric-field gradients inside the activ...

Whip type antennas are probably the most commonly used antennas in portable RF systems, such as cordless and cellular phones, RF enabled laptop computers, , and handheld computers. Whip antennas are almost always mounted on the chassis which contains the radio and other electronics. Normally in mobile phone two set of antenna used for receiving different application such as GSM and GPS. In this...

Aiming at increasing the apparent bunchlength and hence the beam life time in electrons storage rings, RF phase modulation near one parametric resonance has been experimentally investigated. Since the eventual benefit of this technique depends greatly on the ring parameters, we studied the effect of such a modulation for different RF parameters on the longitudinal emittance. Theoritical predict...