Question

A rectangular waveguide has dimensions 1cm $\times$ 0.5 cm. its cut-off frequency is

• A. 5 GHz
• B. 15 GHz
• C. 10 GHz
• D. 12 GHz

Answer 1

The correct option is B 15 GHz

Ans : (c)

${\lambda }_c=2a$

(For $T{E}_{10}$ dominant mode)

= 2 $\times$ 1cm = $2\times {10}^{-2}$ m

$f_c=\frac{c}{{\lambda }_c}=\frac{3\times {10}^8}{2\times {10}^{-2}}=15GHz$