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Radio Frequency Identification (RFID) and implantable biomedical devices needefficient power and data transfer with very low profile antennas. We propose alow profile electrically small antenna for near-field wireless power and datatelemetry employing a metamaterial Split Ring Resonator (SRR) antenna. SRRs canbe designed for operation over wide frequencies from RF to visible. However,they are inherently narrowband making them sensitive to component mismatch withrespect to external transmit antenna. Here we propose an embedding of anon-foster impedance circuitry into the metamaterial SRR structure that impartsconjugate negative complex impedance to this resonator antenna therebyincreasing the effective bandwidth and thus overcoming the fundamental limitfor efficient signal coupling. We demonstrate the concept through extensivenumerical simulations and a prototype system at the board level using discreteoff-the-shelf components and printed circuit SRR antenna at 500 MHz. We showthat the power transfer between SRR receive antenna and the external transmitloop antenna is broadened by almost 400 MHz which corresponds to increase in{\Delta}f/fC from 0.49 to 1.65, before and after non-foster circuit activation.

Broadband Energy Harvesting Using a Metamaterial Resonator Embedded With Non-Foster Impedance Circuitry