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In this paper, a review is given of present state of the art about the concept of wireless power transmission i.e., transmitting power as microwaves from one place to another in order to reduce losses during the transmission and distribution of electrical power or also to deliver energy in location where conventional wires are expensive, inconvenient or(More)
The purpose of this paper is to design a microstrip rectangular antenna in Advance Design System Momentum (ADS). The resonant frequency of antenna is 4.1GHz. The reflection coefficient is less than -10dB for a frequency range of 3.1GHz to 5.1 GHz. The proposed rectangular patch antenna has been devise using Glass Epoxy substrate (FR4) with dielectric(More)
Biological tissues are seen as multilayer structures. We will use in this article a model with three layers: skin, fat and muscle. This structure may be related to a pattern of cascaded lines where each tissue has its own characteristic impedance, permittivity and conductivity. This structure allows us to solve the problem of the surface impedance. Each(More)
This work studies the spread of a UWB pulse in biological tissue, which forms the propagation media to the electromagnetic waves to detect a heartbeat. This tissue is multiple Modeled as semi-infinite lossy and dispersive media. The study focused on the deformations at the interfaces between two successive layers. The FDTD method is an approach for solving(More)
Most state of the art automatic speech recognition (ASR) systems are typically based on continuous Hidden Markov Models (HMMs) as acoustic modeling technique. It has been shown that the performance of HMM speech recognizers may be affected by a bad choice of the type of acoustic feature parameters in the acoustic front end module. For these reasons, we(More)
This paper describes the design and the optimization of a rectenna in ISM band, dedicated to wirelessly supplying RFID's sensors, to replace or recharge existing batteries. The circuit is based on a double voltage rectifier designed and optimized at 2.45GHz with ADS software. We detail a new methodology to design and optimize a rectenna circuit. As a(More)
Among the identified implantable electronic systems, there is a pacemaker, urinary implants, visual implants and auditory cochlear implants. This system is composed of an implant and a control unit. The implant is designed to work efficiently and autonomously for long periods. It is placed under the skin of the user. The main tasks of the implant are the(More)
In this paper, an Ultra-Wide-Band (UWB) RF power amplifier (PA) which provides some great features such as high and flat gain, low power, small group delay variation and a greater stability across the entire spectrum from 3.1GHz to 10.6 GHz is proposed. The UWB PA that it is implemented in 0.18μm CMOS technology employs stagger tuning technique which(More)