2-1 Typical Calibration Curve 3 5 2-8 Zero Drift on Thermistor Bridge 35 2-9 Transient Response to Transistor Bridge to step function of DC Power Input 3 6 2-10 The DC power output, losses in the microwave diode, and losses in the input filter circuit are shown as a percentage of the microwave power absorbed by the rectenna element as a function of incident microwave power level. The sum of all of these is then compared with the absorbed microwave power. 40 2-11 Simplified Math-Model Schematic Diagram for Interpreting Computer-simulation results presented in Figures 2-12 and 2-13. 44 2-12 Time Behavior of Input Current to Rectenna Element, Diode Current, Microwave Filter Output Current, and Input Current to Rectifier Tank Circuit, as Computed 45 2-13 Time Behavior of Input Voltage to Rectenna Element, Diode Voltage, Diode Junction Voltage, and Voltage Across Output Capacitance Filter, as Computed. 45 2-14 Comparison of Computer Simulation Computations of Efficiency, Diode Losses, and Circuit Losses with those obtained experimentally. 48 3-1 A summary of the efficiencies achieved with various new rectenna and diode configurations as a function of power level, compared with performance of a standard RXCV element. 51 3-2 Rectenna Element Test Vehicle 54 3-3 RXCV Rectenna Element modified to provide higher characteristic impedance of second section of the input filter which serves as a X/4 matching section for higher impedance operation of the rectifier circuit. 56 3-4 Expanded waveguide section modified to permit testing of rectenna element with axis normal to regular position. New orientation corresponds to that in the two-plane rectenna construction format. 56 4-1 Comparison Between Voltage Current Characteristics for GaAs-Pf. 67
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