Question

A parallel plate waveguide has plate separation d = 1 cm is filled with a dielectric material $({\epsilon }_r=2.1)$. The maximum operating frequency such that only TEM mode will propogate is

• A. 1.035 GHz
• B. 15 GHz
• C. 10.35 GHz
• D. 1.5 GHz

Answer 1

The correct option is C 10.35 GHz

$f\le f_{C_1}=\frac{1}{2d\sqrt{{\epsilon }_r}}\times c=\frac{3\times {10}^8}{2\times {10}^{-2}\sqrt{2.1}}=10.35GHz$