| A new way of power supply which is more effective than making use of the implanted battery is attractive for implanted system operation. Among all the solutions, electro-magnetic coupling is proved to be feasible and suitable for transmitting power wirelessly to implanted devices especially when their power consumption is large. However, of this solution the coupling coefficient is small, and the power attenuation is significant enough. Therefore, various methods to improve the efficiency of inductive coupling system are studied in this paper, so that the optimized operation frequency can be figured out and a stable and continuous power supply can be provided to the implanted system.In this paper, experiments which based on wireless power delivery theory are done to measure the coupling effect of RF MEMS coils, at the same time we build a model of transmitter and receiver coils. The experiment station includes four parts:a network analyzer, a few transmitter and receiver coils, a clamp stand and some SBF liquid. Before the experiment, we should fix transmitter and receiver coils on the clamp stand according to the model. The measuring frequency is from 1MHz to 200MHz. Based on the experiment station, RF power attenuation versus lateral distance, vertical distance in air, SBF were measured. We should do the experiment many times to get more accurate measure results. And from the data of experiment, we draw the S parameters defining attenuation equation to study the coupling effect of RF MEMS coils. The power is found to decay exponentially with the transmission distance increases at lower frequencies in our experiment.
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