Near-Field Wireless Transfer to Embedded Smart Sensor Antennas in Concrete
Keywords:
Concrete, embedded, near-field, sensor, wireless powerAbstract
Wireless power transfer to embedded smart sensor antennas using near-field coupled loop antennas is experimentally studied. Multi-turn loop antennas designed for operation at around 10 MHz show that they can attain fairly high efficiency when properly matched and operated in close proximity to each other whether in free-space or within dry concrete. When one loop is embedded inside 2, 4, and 6 cm of concrete while the other resides over it, it is shown that the embedded loop can receive about 1.9, 1.6, and 1.3 watts of power respectively when the transmit power is 5 watts. Thus, even with an external transmitter with only 1 watt of power (30 dBm) will allow the received power to be 380 mw, 360 mw, and 260 mw for 2, 4, and 6 cm of concrete respectively. It is expected that the use of an even larger loop, magnetic material loading, and or the use of a flux concentrator will increase the efficiency further.
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