Topic: Electronics Engineering
Which mode of a circular waveguide will have the lowest attenuation?
- A. $TE_{11}$ Mode
- B. $TM_{0}$ Mode
- C. $TE_{21}$ Mode
- D. $TE_{01}$ Mode
Answer: D. $TE_{01}$ Mode
Explanation: For circular waveguide: $TE\rightarrow\lambda_{c}=\frac{2\pi a}{P_{nm}^{\prime}}$ and $TM\rightarrow\lambda_{c}=\frac{2\pi a}{P_{nm}}$. For lowest attenuation $\lambda_{c}$ should be minimum. The dominant mode for lowest attenuation is the $TE_{01}$ mode.