Topic: Electromagnetics
The value of axial ratio of a $45^{\circ}$ linearly polarized EM wave in dB is
- A. infinite
- B. 0
- C. 1
- D. 2
Answer: A. infinite
Explanation: Axial ratio is defined as the ratio of maximum to minimum electric field ($E_{max}/E_{min}$). For any linearly polarized EM wave, the minimum electric field component in the polarization ellipse is 0. So, Axial ratio = $E_{max}/0 = \infty$. In dB, it remains infinite.