Lutfi Albasha

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Based upon a unique junction pseudomorphic high electron-mobility transistor (J-pHEMT) device, a novel method of providing high-efficiency power amplifier (PA) power control for variable envelope modulation schemes is demonstrated for enhanced data rates for global system for mobile communications evolution and wide-band code division multiple access. This(More)
The system specifications of RF energy harvesting are outlined, indicating the general guideline of low power circuit and system design as well as the frequency set to be used in the system. Four frequency bands representing five wireless standards were chosen namely, GSM, DTV, Wi-Fi, Bluetooth and road tolling system. A harvesting system has been designed(More)
This paper presents a physical model and experimental validation for the breakdown process in HEMTs and MESFETs. The model is integrated into a fast quasi-two-dimensional physical simulation. The model takes account of the tunnelling effects in the region of the gate metallization. A new thermal model monitors the channel temperature and controls the(More)
In this paper, a novel miniaturized printed elliptical antenna is presented. The presented antenna exhibits a multiband frequency response, which makes it suitable for variety of applications such as radio frequency energy harvesting. The achieved multiband antenna response helps in compacting the overall size of such systems by having a single antenna unit(More)
In order to increase system capacity and improve UE peak throughput, 3GPP has introduced Multi Carrier operation for HSPA by aggregating 2 adjacent carriers in Release 8 and further enhancements in Release 9 by aggregating upto 4 non adjacent carriers. Similar operation was adopted in 3GPP Release 10 for LTE allowing it to aggregate upto 5 carriers. Many(More)
In this paper we present an optimised design of diodes for operation in energy harvesting cells. The work was based on analysing which of the diode extended model mostly affected the conversion efficiency of the rectifier. A physical device model was then constructed, modelled and optimised to reduce dissipated energy through the rectifier.
This paper introduces another methodology of charging lithium-ion batteries for portable devices such as laptops and tablets. The presented low-cost charger circuit which is developed to be easily designed follows the constant-current and constant-voltage scheme, CC-CV. Also, this charger circuit will continuously and automatically charge and discharge the(More)