ANT10: Aperture AntennasANT10: Aperture AntennasB Prof Gregor D D rginBy Prof. Gregory D. Durgincopyright 2009 – all rights reservedRadiation Plot of a Circular Field Aperture, R=2Uniform Dish Pattern, =2R 10 20 30 40Uniform dish of 2.0 wavelengths-----------------------------------Peak gain: 171.4 (22.3 dBi)Half-power beadwidth: 14.4 degSide-lobe level: 18.4 dBcopyright 2009 – all rights reservedRadiation Plot of a Circular Field Aperture, R=4Uniform Dish Pattern, =4R 10 20 30 4000300Uniform dish of 4.0 wavelengths-----------------------------------Peak gain: 656.4 (28.2 dBi)Half-power beadwidth: 7.2 degSide-lobe level: 17 8 dBcopyright 2009 – all rights reservedSide-lobe level: 17.8 dBRadiation Plot of a Circular Field Aperture, R=10Uniform Dish Pattern, =10R10203040 10 20 30 40Uniform dish of 10.0 wavelengths-----------------------------------Peak gain: 3959.4 (36.0 dBi)Half-power beadwidth: 2.9 degSide-lobe level: 17.7 dBcopyright 2009 – all rights reservedSpot Size of Dish on GroundP D it (dB) 10 0 k 10 0 kPower Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 1 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-3-2-1-5-438-7-6-10-9-8copyright 2009 – all rights reserved -11Multiple Dish Satellites, N=2Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 2 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-5-10-20-15-25copyright 2009 – all rights reserved -30Multiple Dish Satellites, N=3Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 3 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-5-10-20-15-25copyright 2009 – all rights reserved -30Multiple Dish Satellites N=7Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 7 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-515-10-20-15-25copyright 2009 – all rights reserved -30Multiple Dish Satellites, N=11Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 11 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-5-10-20-15-25copyright 2009 – all rights reserved -30Multiple Dish Satellites, N=21Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 21 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-515-10-20-15-25copyright 2009 – all rights reserved -30Multiple Dish Satellites, N=51Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 51 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-515-10-20-15-25copyright 2009 – all rights reserved -30What if the Phases Gets Scrambled?Power Density (dB) across 10.0 km x 10.0 km area5.0 km ring of 51 satellites at 35786 km altitude300.0 m dish diameter, transmit at 5.8 GHz 0-515-10-20-15-25copyright 2009 – all rights reserved
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