How can I transmit RF signal, make it bounce from a surface and detect the bouncing signals?
Answer:
yeah radar. send the RF as a very short duty cycle pulse, then switch the antenna to the receiver to catch the echoes. repeat as needed. antennas for doing this are generally more efficient at higher frequencies, such as microwaves.
You will need an RF receiver. Ham radio operators do this all the time. I suggest using VHF/UHF/microwave bands so that the distance traveled is short enough for you to measure easily.
Invent radar.
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