Ground segment Rectennas must be located in the relatively limited zone where the SPS is visible at an elevation angle of at least 60 degrees. This is a zone between latitudes of 5.5 degree north and south, or a 1200 km wide equatorial zone for an orbital altitude of 1000 km. Another constraint on site allocation is the minimum distance between two neighboring rectenna sites, which is required to make the power receiving time for each site as long as the beam angle can be controlled. Accordingly, the minimum distance between two rectennas should be 1200 km as well, and the reception time duration is approximately 3 minutes. Since the orbit altitude is nearly proportional to the serviceable zone width of the latitude and the minimum distance between neighboring rectennas, a higher altitude covers more regions. On the other hand, the mass which can be carried by launch vehicle to a higher orbit will be reduced significantly. It will be
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