M. I. Hussein

Multivariable Fuzzy Inference with Multi Nearest Neighbour for Indoor WLAN Localization Based on RSS Fingerprint

The power of fuzzy systems was approved in overcoming uncertainties and identifying ambiguities. Localization in wireless environments is found to have many uncertainties. In this paper a multivariable fuzzy inference system is combined with multi-nearest neighbor algorithm to estimate location of an object in an indoor wireless local area network. The proposed combination utilizes from the robustness of fuzzy systems to overcome some of the uncertainties associated with radio wave propagation and small scale signal variation. This work is focusing on the available localization techniques and how fuzzy systems are merged with other techniques to enhance the location estimation then it utilizes from the estimated position parameters and its correlation with the received signal strength, where the augmentation of one more input variable has grabbed non negligible attention in overcoming some of the uncertainties in location estimation especially the ones associated with the small scale variations due to changes in the physical environment.

Planar Ultra-Wideband elliptical antenna for communication applications

This paper introduces new design and implementation of low profile planner antenna for Ultra-Wideband (UWB) applications. This new antenna consists mainly of conducting elliptical patch and the partial conducting ground plane, with fabrication dimensions of 41.95×21.2×1.27 mm, the design was fabricated using Rogers 5880 LZ substrate. The impedance bandwidth of the designed antenna is between 3 GHz to 10.75 GHz and the selected ground length is 10 mm. VSWR and S11 are obtained for the new antenna through HFSS simulation for different ground plane lengths. Antenna group delay, maximum antenna gain and radiation pattern for this new antenna are studied and analyzed. We further take the design one step beyond the simulation and fabricate a prototype for testing. Simulation results and experimental results obtained from the fabrication show an excellent agreement, achieving the desired bandwidth.

Single port bio-sensor design using metamaterial split ring resonator

Metamaterial are artificially made electromagnetic materials consisting of periodically arranged metallic elements which are less than wavelength of incident wave in size. They can exhibit a strong localization and enhancement of fields, which may provide a tool to significantly enhance the sensitivity and resolution of sensors. Slotted Ring Resonator (SRR) is one type of such metamaterial. In this paper we will present the design of a single port double SRR concentric rings. The concept of structure resonance will be applied to the design of the sensor to be used in bio-sensor application. The design is verified using High frequency simulation software HFSS, and different five different biological material samples are tested and placed in the SRR gab. It was observed that a shift in the resonance frequency takes place as different materials are place in the SRR gab.

A study of the surface plasmon enhancement using ARC on thin film Si solar cell performance

Trapping light inside the solar cells can significantly boost their efficiency by minimizing the reflection losses at the front interface as well as the absorption losses in the solar cell by increasing the path length of incoming light. This study focuses on light trapping using antireflection coating (ARC). One of the simplest and most efficient types of ARC is called the quarter-wave transformer. Its great results make it a good and cheaper alternative for using metallic nanoparticles (MNPs). However, using MNPs with appropriate parameters might have a positive effect on the overall enhancement. In this work it was found that placing the NPs on the ARC surface give the best results compared to the other positions, whereas decreasing the overall refractive index of the device improves its behavior.

SRRs effect on circular antenna with elliptical rings for ultra-wide-band

This paper presents a novel microstrip antenna that consists of conducting circular patch with elliptical etched rings and partial conducting ground plane. The fabrication was done using Rogers 5880 LZ substrate, and the dimensions are selected to be 45mm × 31mm × 1.27 mm. Split Ring Resonators (SRRs) will be used to enhance gain performance for wide frequency band. The Split Ring Resonator design is simulated using HFSS (High Frequency Structure Simulator). The final antenna simulation results along with the SRR group delay, maximum antenna gain, radiation pattern, S11 and VSWR are illustrated. The presented antenna achieved the desired BW and the simulated S11 and VSWR are coherent, showing a unique performance.

Quadrotor object tracking using real-time motion sensing

This paper presents a motion sensing platform based autonomous mobile object tracking using Unmanned aerial Vehicle (UAV). The position of the moving object was estimated using VICON motion capture camera system, and the information was processed using locally developed Matlab Simulink code. The UAV was assigned to navigate autonomously along the path of the moving vehicle and track it. The derived data was plotted and the efficiency of the tracking system is analyzed.

Dielectric characterization of breast cancer cell lines using microwaves

This paper is an approach towards the microwave characterization of breast cancer cells. In vitro models of breast cancer were prepared in the laboratory using immortalized cell lines and a standard culture medium. Dielectric properties of these cultured breast cancer cell lines were measured at frequencies from 200 MHz to 13.6 GHz using open-ended coaxial cable technique. Four different types of breast cancer cell lines were examined: MCF7, MDA-MB-231, HS578T and T47D. For all the samples, it was observed that the permittivity decreases and conductivity increases with increase in frequency.

A multiband planar antenna design using hexagonal patch and a resonator slot

In this paper, a hexagonal patch antenna with modified L-shaped slots, used for multiband applications is proposed. FR4 is the substrate used with dielectric constant of 3.85. Modified L-shaped slots are arranged on patch to give resonator effects and are been used to generate multiple bands in the antenna. The proposed antenna offers multiband response at resonant frequencies of 3.5GHz, 5.8 GHz, 8.9 GHz and 10.7 GHz. The simulated results shows good performance with a minimum reflection loss of −23.14 dB and VSWR<2.