Abdel-Aziz T. Shalaby

D4. Monte Carlo simulation of single electronics based on orthodox theory

In this paper, we present a detailed algorithm to compute the current-voltage characteristics of the single electron circuits by Monte Carlo method. Our simulator is designed to solve capacitance systems that contain tunnel junctions. The simulation process is based on orthodox theory. Single electron box, single electron transistor, electron pump and inverter circuits have been investigated, and the results are compared with the previous relevant literature.

Complex Envelope Second-Order Statistics in High-Altitude Platforms Communication Channels

High-altitude platforms are one of the most promising alternative infrastructures for realizing next generation high data rate wireless networks. This paper presents a three-dimensional (3-D) scattering model for land mobile stratospheric multipath-fading channel with its complex faded envelope. From the scattering model and the complex envelope second-order statistics are derived for a 3-D non-isotropic scattering environment. When we discuss on the second-order statistics we refer to the level crossing rate and the average fade duration, whichare two main parameters in describing the fading severity over time and are very important in assess system characteristics such as hand off, velocities of the transmitter and receiver and fading rate. Numerical calculations have been carried out to demonstrate theoretical derivations and the utility of the proposed model.

Realization of metamaterial zeroth-order resonators based on MIM capacitor

A metamaterial Zeroth-Order Resonator (ZOR), based on Metal-Insulator-Metal (MIM) capacitor, constructed by two-layers substrate is presented. Compared to monolayer structure, the proposed structure achieves lower transmission frequency, compact dimensions and more freedom in the design process. The structure has been designed, fabricated and tested. The measured return loss, at 2 GHz operating frequency, is -22 dB and the unloaded Q factor is around 250.

Design of UWB notch filter using CRLH metamaterials

In this paper, we propose a stop-band notch filter, which rejects the narrow frequency band of the Wi-MAX 802.16d (3.4 GHz to 3.6 GHz) and keeps the remaining UWB spectrum (3.1-3.4 and 3.6-3.9 GHz) unchanged. The proposed filter has been realized using the metamaterial technology based on the CRLH metamaterial structures. The selected center operating frequency is 3.5 GHz, which is the mid-band frequency for the Wi-MAX. The obtained results have shown that the 3-dB notch bandwidth is about 200 MHz frequency band which extends from 3.4 to 3.6 GHz. The filter has been designed, simulated, optimized and fabricated using conventional MICs technologies. The simulation and the measurement results have been compared. The insertion loss shows -29 dB at the frequency of interest. The comparison reveals good agreement between the simulated and the measured results.

THIN FILM FERROELECTRIC TUNABLE ZEROTH-ORDER RESONATOR BASED ON CRLH METAMATERIALS

In this paper, we propose a tunable CRLH ZOR based on the latest resurgent of ferroelectric materials. It is known that for most resonant structures, attainment of optimal performance requires some level of additional tuning through either mechanical means (i.e., with tuning screws) or other coupling mechanisms. Therefore, incorporation of electronic tuning into high temperature superconductor (HTS) material components without degradation of performance is very attractive. The result will be low-loss microwave components that could be fine-tuned for optimal performance, with the additional attribute of being tunable over a broadband frequency range. The dielectric properties of the ferroelectric thin film, and the thickness of the ferroelectric film, play a fundamental role in the frequency or phase tunability and the overall insertion loss of the circuit. The main driving force toward using the ferroelectric is the potential for substantial miniaturization of microwave components and systems and the pote...

Tunable and adaptive LHM ZOR using a nonlinear dielectric thin film of STO

In this paper, we propose a tunable CRLH ZOR based on the latest resurgent of ferroelectric materials. It is known that for most resonant structures, attainment of optimal performance requires some level of additional tuning through either mechanical means or other coupling mechanisms. Therefore, incorporation of electronic tuning into HTS components without degradation of performance is very attractive. The result will be low-loss microwave components that could be fine-tuned for optimal performance, with the additional attribute of being tunable over a broadband frequency range. The dielectric properties of the ferroelectric thin film, and the thickness of the ferroelectric film, play a fundamental role in the frequency or phase tunability and the overall insertion loss of the circuit. The ZOR is designed, and simulated by the full-wave analysis software. The response shows a variation of electromagnetic characteristics with the applied electric field, ferroelectric thickness and the operating temperature.

CRLH ZOR metametrial, design, simulation and fabrication

In this article, a survey about ZOR is illustrated and its characteristics are investigated in a detailed manner. The fabrication process has been presented to focus on the practical limitations of metamaterials. An application based on ZOR like a notch filter is presented. The notch filter is used in UWB applications. Later, a tunable mechanism based on the nonlinear dielectric of ferroelectric has been proposed. The model is only simulated due to technology limitations. All different configurations were designed with both HFSS and CST, what resolve the electromagnetic fields in all the structure that is going to be analyzed.