Table 10.3.4 Frequency Trade-Off Analysis 1 c o /ic nu / T Power Flux Density In order to allow the power to be received (i.e higher than thermal noise for instance) and efficiently converted back to DC, this density has to be higher than a certain threshold per rectenna converting element. This threshold is assumed to be 100 mW, which should be achievable within ten years. In our case, the power flux density ranges from a few tens of mW to a few mW per square meter ; this means that the power shall be concentrated prior to the rectification. This can be achieved with parabolic dishes. Then, as the satellite passes over the rectenna with high velocity and with different azimuths from one orbit to the other, the concentrating dishes shall track the satellite. Conclusion The system power budget is given on the Table 10.3.5. The power flux density constraint appears to be a very limiting factor which reduces the extent of the demonstration to experimental purposes only, as significant amount of power will also be needed to move the concentrating dishes. Given these conditions, the location of the rectenna in Antarctica is questionable. A suitable location would be near the equator or even in a high latitude (but accessible) area in order to take advantage of more visibility periods. Table 10.3.5 System Power Budget_______________
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