What is the importance of G/T?

G/T stands for receiver Antenna Gain to Thermal Noise ratio.? It turns out that C/N is directly proportional to G/T for any receiver.? Therefore, the data rate or?throughput?is directly proportional to G/T.

For instance in?SATCOM link, the receiver C/N reference to antenna terminal is directly proportional to G/T.

By carefully looking into the G/T metric, it becomes clear that just optimizing the antenna for its gain does not necessarily yields to a better C/N, as there is a trade-off between antenna gain and its thermal noise.?? Consequently, G/T is the metric to be optimized during antenna design.

Antenna temperature?is function of its physical and brightness temperatures, as well as radiation efficiency.

Appropriate systems and architecture design takes into account the trade-offs and inherent relationships between these metrics to arrive at appropriate link budget and system behavioral model for computing C/N and throughput.

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