Topic: Electromagnetics / Antennas
A $\lambda/4$ monopole antenna radiates 20 W with gain of 3 dBi. What is its Effective Isotropic Radiated Power?
- A. 10 W
- B. 20 W
- C. 40 W
- D. 60 W
Answer: C. 40 W
Explanation: Effective Isotropic Radiated Power (EIRP) is the product of the transmitted power and the antenna gain expressed in linear scale. Gain in linear scale = $10^{(3/10)} \approx 2$. Therefore, EIRP = $20~W \times 2 = 40~W$.