A wireless charging system comprising: a transmitter coaxial structure comprising a first substrate and a first metallic core formed at a center of the first substrate ; and a receiver coaxial structure comprising a second substrate and a second metallic core formed at a center of the second substrate , wherein: the transmitter coaxial structure is configured to carry a radio frequency, RF, signal present on the first metallic core and generate a coaxial field radiation distributed in an area around the transmitter coaxial structure when the transmitter coaxial structure and the receiver coaxial structure are placed in proximity to each other; the receiver coaxial structure is configured to: receive the RF signal from the transmitter coaxial structure , the RF signal being transferred from the transmitter coaxial structure to the receiver coaxial structure as part of the coaxial field radiation when the transmitter coaxial structure and the receiver-coaxial structure are placed in proximity to each other; and convert the received RF signal into energy to power and/or charge an electronic device coupled to the receiver coaxial structure . a transmitter coaxial structure comprising a first substrate and a first metallic core formed at a center of the first substrate ; and a receiver coaxial structure comprising a second substrate and a second metallic core formed at a center of the second substrate , wherein: the transmitter coaxial structure is configured to carry a radio frequency, RF, signal present on the first metallic core and generate a coaxial field radiation distributed in an area around the transmitter coaxial structure when the transmitter coaxial structure and the receiver coaxial structure are placed in proximity to each other; the receiver coaxial structure is configured to: receive the RF signal from the transmitter coaxial structure , the RF signal being transferred from the transmitter coaxial structure to the receiver coaxial structure as part of the coaxial field radiation when the transmitter coaxial structure and the receiver-coaxial structure are placed in proximity to each other; and convert the received RF signal into energy to power and/or charge an electronic device coupled to the receiver coaxial structure . the transmitter coaxial structure is configured to carry a radio frequency, RF, signal present on the first metallic core and generate a coaxial field radiation distributed in an area around the transmitter coaxial structure when the transmitter coaxial structure and the receiver coaxial structure are placed in proximity to each other; the receiver coaxial structure is configured to: receive the RF signal from the transmitter coaxial structure , the RF signal being transferred from the transmitter coaxial structure to the receiver coaxial structure as part of the coaxial field radiation when the transmitter coaxial structure and the receiver-coaxial structure are placed in proximity to each other; and convert the received RF signal into energy to power and/or charge an electronic device coupled to the receiver coaxial structure . receive the RF signal from the transmitter coaxial structure , the RF signal being transferred from the transmitter coaxial structure to the receiver coaxial structure as part of the coaxial field radiation when the transmitter coaxial structure and the receiver-coaxial structure are placed in proximity to each other; and convert the received RF signal into energy to power and/or charge an electronic device coupled to the receiver coaxial structure . <EOS>