![]() ![]() In a transmitting antenna, the gain describes how well the antenna converts input power into radio waves headed in a specified direction. “In electromagnetics, an antenna’s power gain or simply gain is a key performance number which combines the antenna‘s directivity and electrical efficiency. ![]() In this case, all parameters must be in dB Definition: Equivalent Isotropic Radiated Power:.The link budget equation is often expressed in the log domain and using the following definitions: Effect of atmosphere and circuit losses:Ĭombining all those expressions, we find the link budget equation:.These values can be combined into intermediate expressions. = receiver antenna gain (unitless, Watts/Watts).= transmission path loss (unitless, Watts/Watts).= transmit antenna gain (unitless, Watts/Watts).= transmitter-to-antenna line loss (unitless, Watts/Watts).Note that this is a single equation linking 9 parameters, so there are multiple possible combinations of values that can satisfy the requirements: What radio frequency should we choose to transmit?.How much noise can we accept on the receiver?. ![]() This section will describe the components of this equation and how to modify the link budget to close. It links together the requirements (data rate, BER) with the main design parameters of both the satellite communications subsystem and the ground segment. The link budget equation is the fundamental relationship driving the design of the communications architecture. An Introduction to Satellite Link Budget – Part 1. ![]()
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