You can use a pair of small loop antennas (D<=0.1*lambda) to charge the circuit. they have poor radiation resistance, but their magnetic flux is tightly bound near the circumference of the loop., the field strength drops off as 1/r squared. but within close prximity you should get maximum coupling.
at my ast job, we had a technology symposium, and one phillipino engineer used the strategy of coils and loops to light up a bulb. not really efficient means of power transfer though.*