What is the portion of energy carried by elecromagnetic field inside the coax versus the energy carried by currents in the conductors. I belive that lowering the frequency the greater part of the energy will be transmited with currents rather than EM field. Any comments?
Please, allow me to disagree, m8t. If you connect a coax to mains power supply (50 Hz) the energy delivered to the matching load will be transfered mainly by currents in inner and outer conductor. If you prowide rf (500MHz) the energy will be delivered to the load mainly by the field. The only difference is the frequency.