Figure 5-11. Input admittance to the foreplane rectenna element measured at the junction of the half-wave dipole to the low-pass filter section. Input admittance is a function of the input microwave power level and the DC load resistance. Data were obtained using the expanded waveguide test fixture and one of the elements in the foreplane construction. The rectenna element tested was connected in the intended manner to the adjacent rectenna elements. The susceptance component can be varied by resetting the position of the movable short near the diode rectifier. By adjusting this setting and the DC load, it is possible to obtain a zero power reflection for a wide range of incident power. The 5-watt input level was placed at the center of the Smith Chart because this is the intended power level of operation when the foreplane structure is put into the 199-element rectenna for test.
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