Analytical Studies of Earth Station Antenna/DTH Using Cohen's Empirical Formulas in Matlab

Satellite communication is buzzword of todays shift changing competitive world. Earth station antenna are the ground segment infrastructure which interacts with satellites antenna for transmit & receive purpose of the signals. DTH is the miniature version of the Earth station antenna which works on the same principle that of Earth station antenna, So DTH antenna of specific size has been picked up and detailed calculation have been carried out to predict Cl, Cd, Cp & Cm from Cohens empirical curves. From the comparative studies of these coefficients, values of maximum Lift (L), Drag (D), Moment (M) & Pressure distribution for specific azimuth & Elevation angles have been calculated. Earth station antenna/DTH are subjected to wind gamut of forces viz. wind loads, gravity loads, acceleration loads, temperature loads & earthquake loads but the calculation of wind load have been emphasized in present work as it is the major & governing contributing factor in the design. These calculations of above parameters have been performed in MATLAB (version R2011b) by developing the original code by digitizing the co-ordinates and coding the formulae using the Edward Cohens paper. Graphical & Pictorial representation of the standard curves for the L, D, M along with the resultant pressure co-efficient Cp have been carried out & calculations have been done for different Wind speed both for ESA & DTH antenna in order to capture the holistic behavior the structural analysis has been carried out by using multi-physics ANSYS for Reflector, Mount as well as the complete antenna system. The results have been tabulated for wide gamut of iterations of analysis in the domain of stress, strain & displacement, Structural analysis is carried out on the whole system for critical values of lift, drag and moment.