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GATE ECE 2007 | Question-64

An air-filled rectangular waveguide has inner dimensions of $3 \mathrm{~cm} \times 2 \mathrm{~cm}$. The wave impedance of the $\mathrm{TE}_{20}$ mode of propagation in the waveguide at a frequency of $30 \; \mathrm{GHz}$ is (free space impedance $\eta_{0}=377 \; \Omega$ )

  1. $308 \; \Omega$
  2. $355 \; \Omega$
  3. $400 \; \Omega$
  4. $461 \; \Omega$
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