1.

In a co axial line with inner and outer diameters of 0.0645 and 0.0215 inches and a Teflon di electric with ‚ààr=2.2. The highest usable frequency before the TE11 waveguide mode starts to propagate is:$

A. 16.8 GHz
B. 117.7 GHz
C. 15.3 GHz
D. 8.4 GHz
Answer» B. 117.7 GHz


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