What do you know about "wave guide"? Where and when and why it's used?

Thank you very much for your question

Wave Guides are the connecting the high power RF microwave transmitter and the antenna. They are the most efficient way to transfer electromagnetic energy. They are essentially coaxial line without conductors. They are constructed from conductive material and may be rectangular, circular, or elliptical. They are used in all (high power) micro wave applications (radar, satellites,…). Main advantage greatly reduces COPPER LOSSES.

Best regard