The energy would be stored in high voltage capacitors.
Exists >800Mhz RF systems to be used in energy harvesting
Also it can be used diodes and also high frequency power NMOS (up to 1000V) synchronously.
Also it can be used spark gap diodes. I should need to extract >50% of the energy. Spark gaps allows currents up to 10 kiloamps but I do not know the efficiency
It can be based on some hot cathode vacuum diodes
I recall, somewhere in the 1960s there was some work done regarding idea of using low loss circular waveguide for energy transmission using microwaves (as alternative to HV lines and cables). The idea was to use magnetron or similar device at transmitting end and 'inverted' = rectifying magnetron as the receiver.
Thank you, could give me more information?
I remember that magnetrons do not have great efficiency
Another system uses spark gaps, but that was done before internet technology so there is not web information about that for the same reason
Perhaps something can be found in this book
https://www.amazon.com/High-Power-Microwave-Electronics-Kapitza/dp/B000B8YFT8
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