What are the advantages and disadvantages of physical electromagnetism and microwave communication? What is the reason why the moon is not feasible as a microwave relay station?

△ Advantages and disadvantages of microwave communication:

Advantages: large capacity, one microwave line can open thousands or even tens of thousands of telephone lines;

Disadvantages: relay stations are needed every 50km (satellites can solve this shortcoming), signal attenuation and time delay.

△ The reason why the moon is not feasible as a microwave relay station;

Although the moon can reflect microwaves, it is too far away from the earth (380,000 kilometers), the signal is attenuated and there is a time delay. Only when two communication points see the moon at the same time can the communication between these two points be completed. Therefore, using the moon as a relay station, the signal is not good, and sometimes the signal may not be received.

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