M. Bekhti

• Master of Research
• algerian space agency

Purpose The present work aims to analyze the performance of a newly designed graphene-based patch antenna by varying the chemical potential in graphene sheet, using the CST Microwave Studio ® software. This study mainly seeks to discuss and assess the advantage of using graphene, instead of copper, as the radiating patch. It should be noted that gr...

This paper describes the application of an evolutionary optimization method to design satellite constellation for continuous regional coverage without intersatellite links. This configuration, called mutual coverage, is related to some technical limitations that exist on small satellite technology. The coverage of the north Algerian seismological n...

Since the commissioning of the manufacture facility and qualification of the processes in 2001, Alsat-1 solar panels were the first ones ever to be made and tested in house by SSTL. The solar panels used lightweight solar panel substrates of aluminium honeycomb with aluminium face skins. The front face skin has a polyimide insulation layer ready fo...

Currently in orbit satellite electrical power system demands are doubling every five years, forcing the spacecraft designer to look for options to solve the power availability problem. The need for high performance solar arrays for space applications continues to increase, as the energy budget of satellites becomes ever higher, and power systems be...

This paper focuses on ways in which space is being used to build capacity in science and technology in order to:•Offer increasing support for national and global solutions to current and emerging problems including: how to improve food security; resource management; understanding the impacts of climate change and how to deal with them; improving di...

Alsat-1 is the first small satellite for the Centre of Space Techniques (CTS) – Algeria. It was designed, built, assembled and tested at Surrey Satellite Technology Limited (SSTL) at the University of Surrey, with the participation of 11 Algerian engineers covering all aspects of micro satellite engineering within a technology transfer programme be...

On the 28th November 2002, Algeria's first enhanced micro satellite was launched into a 686km low earth orbit onboard a Cosmos 3M rocket from Plesetsk. The spacecraft was designed, manufactured and launched as a technology transfer programme between the National Centre of Space Techniques (CNTS) Algeria and Surrey Satellite Technology Limited (SSTL...

In this study, our principal objective is the estimation of the parameters of a NiCd battery type by using the artificial neural networks. The idea consists in using a hybrid training based on the evolutionary algorithms and the method of Levenberg-Marquardt. The results of simulation show the good founded of the used technique.

This paper presents an analysis of rectangular microstrip antennas with air substrates. The effect of the substrate thickness on the bandwidth and the efficiency are examined. An additional thin layer supporting the dielectric material is added to the air substrate in order to make the antenna mechanically rigid and easy to manufacture. The effect...

Surrey is currently engaged in launching its first constellation to provide daily global coverage at moderate resolution in three spectral bands, as part of an international initiative to provide global disaster monitoring. The first spacecraft in this disaster monitoring constellation (DMC), AlSAT-1, was launched in November 2002 and is now operat...

Small satellites are becoming increasingly important in the context of capability building in space technology for the developing countries. The use of commercial of the shelf technology "COST" and focus on specific missions can speed up the development process, providing faster as well as cheaper access to space. This paper describes a highly succ...

One of the most important problems in mission planning and satellite command and control is being able to accurately predict orbital motion, because the trajectory of a spacecraft is a fundamental design parameter with major implications for all subsystems. The purpose of this paper is to present, first, the simulation of the satellite orbit analys...

Three different semiconductor processes, based on the use of GaAs, InP, and GaN HEMT devices, were compared for their suitability as microwave switches.

AlSat-1, the first Algerian national satellite of seven microsatellites in the Disaster Monitoring Constellation (DMC), will be launched in September 2002. Micro satellites for Nigeria, United Kingdom, Turkey and Thailand will be launched into the same orbit by the second DMC launch in April 2003, whilst microsatellites for China and Vietnam will b...

The article describes the design of a fifth order low pass filter using microstrip technology. Mathematical expressions are derived for this case (fifth order) and all component values are shown.