Bilal A. Khawaja

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This paper presents a study of millimeter-wave optoelectronic downconversion using the self-oscillating mixer concept. Baseband data are transmitted using a 40-GHz electrical carrier; however, detection only requires a much lower speed photodiode. Both homodyne and heterodyne configurations are presented with the former requiring injection locking which can(More)
In this paper, the design, Optimization and simulation of a dual-band coaxial-fed 2×2 rectangular U-Slot microstrippatch antenna array for wireless sensor network applications is presented. It operates on 2.1GHz and 3.5GHz bands. A MIMO antenna is proposed for high speed WSNs based communication standards that operates in 1-5GHz frequency range.(More)
Aerial Adhoc Networks are the new class of wireless adhoc networks, where node motion is not restricted in 2D plane as in (VANETs) but rather a 3D plane as these wireless nodes may be mounted on board Unmanned Aerial Vehicles (UAV). Current research literature argues that since flights occur at high altitudes, Line of Sight (LoS) propagation models suffice(More)
In this paper, the design and simulation study of a compact 8-element MIMO antenna system for next generation IEEE 802.11ac Wi-Fi application is presented. The IEEE 802.11ac is an emerging WLAN standard which operates at 5GHz band. The real challenges for IEEE 802.11ac are to meet the recent functional demands and the extensive wireless market growth(More)
In this paper, a microstrip patch antenna and its 1×2, 1×4 and 2×4 arrays are proposed for Flying Ad-hoc Network (FANET) communication in multi-UAV systems. The antennas and arrays resonate in the 5GHz band and have been optimized for high bandwidth and gain. The antennas and arrays are proposed and designed using Rogers RT/duroid(More)
This article presents a characterization study of a state-of-the-art 40 GHz mode-locked laser using a hybrid integrated microstrip patch antenna and bias-T circuit. A passive mode-locking range of 300 MHz is measured using this technique by tuning the gain and saturable absorber bias values for a maximum wireless distance of 15 cm. The passive mode-locking(More)
In this paper, a quad-band H-slot microstrip patch antenna for WiMAX application is presented. The radiation performance such as VSWR, return loss, radiation pattern and gain of the antenna are simulated using Ansoft HFSS and presented. Radiating patch lies on the FR4_epoxy substrate which is having dielectric constant 4. 1 and height 1. 5mm. Coaxial(More)
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