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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 | |