where / and Os denote focal distance and grazing angle of the SPS, respectively. These equations are useful for designing the modified hogline rectenna. Moreover, we may derive the following equation. Since PD/Pin = D/DD, D/Dd given by (3) represents the power concentration by the reflector. The larger D/Dd is, the less the number of CMSAs required. However, too high a power density might damage the rectifying diode. Since the efficiency of the diode depends on the incident power, D/Dd would be determined in such a way that the maximum efficiency is obtained. Fig. 6 shows D/Dd versus Da/A for several values of 0S. We may determine the normalized aperture Da/A corresponding to D/Dd which gives the maximum efficiency
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