Development Of Digital Band Pass Filter And Antenna Design For C Band Small Satellite Uplink Model

摘要

Abstract: The paper deals with band pass filter which is located between up converter and modulator of uplink model for C band small satellite communication system that work digitally. In this paper, FIR equiripple method is used.The selection of FIR equiripple filter depends on the nature of the problem and specifications of the desired frequency response. The main theme of designing a digital FIR filter is to provide the better settlement solution, to improve an efficiency of the desired signal of the system and to allow adjustment of the compromise between the over shoot reduction and transition region width for practical application of the small satellite uplink system. The realization structure of this filter with a specific and symmetric filter coefficient is analysed and the symmetric coefficients of the filter structure is that this filter is stable, it is also linear and it has a constant group delay. And then the magnitude response and phase response of this filter are analysed and the simulation results are also described using FDA tool that is one of the Computer Aided Design tool available with MATLAB which enables design of the digital filter blocks faster and more accurate.With the performance evaluation of the equiripple filter design, the output results are completely suitable for the proposed small satellite uplink model and so Equiripple filter design is found to be the most suitable and optimized method to meet the desired specification. The second part of the paper is to analyze the antenna deign analysis. A multiple-feed system or a beam former is used to generate several beams from this common aperture. This results in a geometry, which has the typical advantages of a spacecraft-borne antenna i.e. a high order of functionality with a compact and lightweight structure. In this paper, the single offset parabolic multi beam reflector antenna is designed and implemented. Basic geometries for MBA are designed and implemented. Reflector antenna radiation analysis method will be used in the design of MBA.