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.