3.2.3 Other Approaches to Efficient Operation at Lower Power Levels 58 3.3 Initial Effort in Integration of Rectenna Element into a Two Plane Structure 58 3.4 The Reduction of Second and Third Harmonic Radiation with the use of Stub Lines 59 3.5 Reduction in radiated harmonic power by metallic shielding 60 3.6 Improvement in the efficiency and in the consistency of efficiency measurements by refinements in the construction of the RXCV rectenna element 60 4.0 SCHOTTKY BARRIER DIODE DEVELOPMENT 64 4. 1 The Diode Design and Construction Matrix 68 4. 2 Life Test on Rectenna Elements and Diodes 69 5. 0 INTEGRATION OF IMPROVED DIODES AND CIRCUITS INTO A DESIGN COMPATIBLE WITH THE LONGER RANGE OBJECTIVE OF A LOW-COST RECTENNA SUITABLE FOR SSPS DEPLOYMENT 75 5. 1 Introduction 75 5.2 Outline of a Production Process for the SSPS Rectenna 77 5.3 Interrelationships Between the Losses in DC Bussing, the Cross Section of the DC Busses, the DC Power Collected by Each Element, the Density of the Rectenna Elements, and the Required DC Output Voltage Level 82 5.4 The Design and Construction of the 5-element Foreplane 84 5.4 . 1 Considerations in the Design of the Outer Metallic Shield 85 5.4 .2 Considerations in the Design of the Core Assembly 88 5. 5 Tests of the Separate Rectenna Elements in the Foreplane Structure with the use of the Expanded Waveguide Fixture 89 5.6 Smith Chart Presentation of Reflection Data 89 5. 7 Test of the 5-element Foreplane as an Integrated Part of a Larger Array 92 6 .0 SUMMARY OF RESULTS 102 7 .0 CONCLUDING REMARKS AND RECOMMENDATIONS HO Appendix A Appendix B
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