SLIDE 14 BEAMED RF POWER TECHNOLOGY RECTENNA RESCATTER AND EMISSIONS THE ANTENNA PATTERNS FOR THE SCATTERED FUNDAMENTAL AND SECOND THROUGH FOURTH HARMONICS OF THE RECTENNA SUBARRAY ARE SHOWN AND COMPARED TO CALCULATED THEORETICAL VALUES AND "IN-WAVEGUIDE" TEST FIXTURE MEASUREMENTS OF A SINGLE DI POLE ELEMENT. AS EXPECTED, THE SECOND HARMONIC HAS A NULL ON AXIS DUE TO THE DIPOLE RADIATOR CHARACTERISTICS. THE RESCATTERED FUNDAMENTAL IS BOUNDED BY AN APPROXIMATELY COS ^ENVELOPE SIMILAR TO THE MEASURED DC-OUTPUT POINTING RESPONSE PATTERN. CLEAN GRATING LOBES AT THE HARMONICS ARE NOT PRESENT, INDICATING A LACK OF PHASE COHERENCE IN THE EMITTED HARMONICS. THE ILLUMINATION IS NOTAS UNIFORM OR INTENSE AS DESIRED DUE TO EQUIPMENT LIMITATIONS. HOWEVER, THE RESULTS ARE BELIEVED TO BE 'TYPICAL" OF THE OPEN-DIPOLE STYLE OF RECTENNA (i.e., NO COMMON, SHIELDED QUARTER-WAVE STUBBED BUSS STRUCTURE IN THE FOREPLANE OF THE REFLECTOR, WHICH WOULD TEND TO FURTHER SUPPRESS THE EVEN HARMONICS).
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