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Iron-Cobalt (Fe-Co) ferrite nanocrystalline materials have been widely applied in microwave and radio frequency devices, such as circulators. Magneto-dielectric nanocrystalline were synthesized by mechanosynthesis (high energy mechanical grinding). Samples were taken at different grinding times. Toroidal samples were made by compact method at room temperature. In this work, the effect of mechanosynthesis...
In this paper, we propose a practical study of the microwave characteristics filter based on metamaterials that is characterized by an index of negative refraction. We analyze the reflection and transmission coefficients calculated from transfer matrix simulations on finite lengths of electromagnetic metamaterials, in order to determine the effective refractive index from the effective permittivity...
This paper proposes a new design approach of a hexagonal fractal ring patch antenna for dual-band applications. The proposed antenna operates at two resonant frequency bands to cover 2.45-GHz WiFi and 3.5-GHz WiMax applications. To achieve dual-band operation, a first-iterative fractal-ring radiating patch is printed on a substrate layer coupled with another identical fractal ring printed in the other...
In this article, a magnetically coupled dual-band bandpass filter (DB-BPF) using stepped impedance resonators (SIR) is presented. The obtained passbands have elliptical function response with good stopband rejection levels. In this filter design, both passbands can be controlled independently while keeping the same filter performance. These independency in bandwidth shifting, make the design flexible...
The main goal of this paper is to develop with partial differential equation 3D toolbox under Matlab environment a “FEM3DPIE” calculating code to study and analysis the piezoelectric phenomena of beam bending actuator in harmonic mode. First, all the equations of the mathematical formulation of the piezoelectric coupling effect are detailed, then the numerical solution based on the Finite Element...
This work proposes a novel quad-band microstrip patch antenna for wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), C and X applications. It is composed of a modified rectangular patch antenna and two parasitic elements which are both printed on one side of a FR4 substrate, a ground plane on other side on which a U-shaped slot is etched. The proposed antenna,...
In this work, three-phase single stage grid-connected photovoltaic system using current control inverter is simulated using Matlab/Simulink. To deal with varying irradiance conditions, the incremental conductance MPPT has been used, however in order to improve the power quality a three-level (NPC) inverter based SVM control together with LCL filter has been used. The main result of the project is...
This paper, present the resonant and the radiation characteristics of superconducting rectangular microstrip antenna printed on uniaxailly anisotropic substrate using an electromagnetic approach based on cavity model in conjunction with electromagnetic knowledge. The cavity model combined with London's equations and the Gorter-Casimir two-fluid model has been improved to investigate the resonant characteristics...
In this paper, a novel and low profile CPW-Fed triple-band microstrip antenna for wireless applications is proposed. The proposed antenna is implemented on FR4-Epoxy dielectric substrate with dimensions of 24×40 mm2 and generates three desired resonant frequencies at about 2.44 GHz, 3.56 GHz and 5–6 GHz for WLAN and WiMAX applications. Numerical results for the return loss and 2D radiation patterns...
In this work, a dual band Microstrip patch implantable antenna for biomedical applications has been presented to operate in both Medical Implant Communications Service (MICS) with a range of 402–405 MHz and 2.4–2.5 GHz band chosen among the Industrial Scientific and Medical (ISM). A rectangular antenna has been first simulated to operate in MICS band with dimensions of 179.7 × 228.3 × 1.63 mm, then,...
Passive elements are indispensable in RF systems and are used for matching networks, LC tank circuits, filtering, … etc. Passive elements can be simply classified into distributed elements including transmission lines and waveguides. As the operating frequency moves into the microwave spectrum, the distributed circuits have a higher Q factor, and thus they are usually used for high-frequency applications...
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