more restrictive beam geometry is required. However, the safe level of exposure is currently unknown. The dashed lines in Fig. 2 show beam power densities at 2.45 GHz for assumed maximum power densities limited at the edge of the receiver to be 1, 0.1, and 0.01 mW/cm2 (P2, P^, and P4, respectively), with values of r0 = 2.82 km and Er = 5.7 GW, r0 = 2.14 km and ET = 3.3 GW, and r0 = 1.8 km and ET = 2.3 GW, respectively. Decreasing the maximum value of power density at the receiver edge also rapidly decreases the exposure levels in surrounding areas outside of the rectenna, but also rapidly decreases the total raidated beam power. The curve designated at P^ with r0 = 3.72 km radiates 10 GW of total power, with 3.9 mW/cm2 at the edge of the rectenna. V. RESULTS It is assumed that 10 GW of continuous microwave power, with a beam radius of 5
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