Question

The same feed is used with a 1 megawatt transmitter at 2.3GHz for planetary radar. What is the on-axis power gain Gmax of this radar system?

Answer 1

Answer on Question 55057, Physics / Astronomy | Astrophysics

Question:

The same feed is used with a 1 megawatt transmitter at $2.3\mathrm{GHz}$ for planetary radar. What is the on-axis power gain Gmax of this radar system?

Answer:

$$G \max = \frac {4 \pi A e}{\lambda^ {2}}$$

With $\lambda = \frac{c}{v} = 13\mathrm{cm}$, and $\mathrm{Ae} = 2.47\times 10^{8}\mathrm{cm}^{-2}$ from the table:

$$G \max = \frac {4 \pi \times 2 . 4 7 \times 1 0 ^ {7}}{1 3 ^ {2}} = 1. 8 \times 1 0 ^ {7}$$

Answer: $\mathbf{G}_{\mathrm{max}} = 1.3\times 10^{7}$

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