Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

At frequencies below the cut off value the wave progresses across the waveguide after total reflections
Waveguides can handle large power at UHF and microwaves
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
At waveguide can be coupled to a coaxial cable

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Electromagnetic Field Theory
In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include

Antenna replacement and feed correction
Amplitude timing and phase correction
Polarization shifting and code diversity
Path diversity and frequency diversity

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