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(Electromagnetics) An AM radio in an automobile cannot receive any signal when the car is inside...

(Electromagnetics) An AM radio in an automobile cannot receive any signal when the car is inside a tunnel. Consider the tunnel a rectangular metallic waveguide of dimensions 6.55 * 4.19 meters.

A) Given the range of frequencies for which only the dominant mode, TE10 will propagate .

B)Explain why AM broadcast band signals (540 - 1600 KHz) cannot be received in the tunnel.

(How far into the tunnel will a 1MHz signal travel before its signal intensity drops by 20 dB

d) Can FM broadcast frequencies (88-108 MHz) be received in the tunnel? why?

engineering   Electrical-Engineering   
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