SLIDE 7 BEAMED RF POWER TECHNOLOGY 8x8 SLOTTED WAVEGUIDE SUBARRAY FUNDAMENTAL (2.45 GHz) AND HARMONIC PATTERNS THE E AND H-PLANE, CROSS-POLARIZED AND HARMONIC PATTERNS ARE SHOWN FOR A 6 WAVELENGTH SQUARE SUBARRAY ANTENNA. THE SLOTTED WAVEGUIDE RADIATOR CONSISTS OF EIGHT WAVEGUIDE STICKS HAVING EIGHT SLOTS EACH. THE SECOND THROUGH FIFTH HARMONICS ARE BOUNDED BY AN APPROXIMATELY COSh4e ENVELOPE. THE AVERAGE HARMONIC GAIN LEVEL BELOW THE PEAK FUNDAMENTAL SIGNAL GAIN LEVEL FOR THE SUBARRAY IS ABOUT 30 dB LOWER THAN THE CORRESPONDING LEVEL FOR A SINGLE, EIGHT SLOT STICK OF WAVEGUIDE. THUS, FOR THE HARMONICS, THE FEED GUIDE - ARRAY OF WAVEGUIDE STICKS, NET LOSS IS ABOUT 30dB. THE CROSS-POLARIZED GAIN LEVEL OF THE FUNDAMENTAL IS ABOUT 50dB BELOW THE DESIRED POLARIZATION. THESE RESULTS MUST BE EXTRAPOLATED TO THE PROPOSED LARGER SUBARRAY ANTENNAS OF THE SPS. ADDITIONAL WAVEGUIDE JUNCTIONS MAY FURTHER REDUCE THE HARMONIC PATTERN GAIN LEVELS.
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