Efficient wireless powering of sensors embedded in concrete via magnetic resonance

Wireless power propagation via Strongly Coupled Magnetic Resonance (SCMR) by helical resonators through a non-homogenous interface, such as, air-concrete, is analyzed here. The power transfer mechanism consists of two self-resonant coils and two single loops in contrast to the two resonant loops traditionally used in RFID systems. The efficiency of wireless power transmission from a source in air to a sensor embedded in concrete via strongly coupled magnetic resonance is simulated as well as measured. The concrete material is modeled for various humidity levels using the extended Debye´s model. The efficiency of the SCMR is also analyzed for different depths inside the concrete.