FREQUENCY DEPENDENCE OF AVAILABLE SIGNAL POWER AS ANTENNA PHYSICAL SIZE LIMITATIONS CHANGE WITH FIXED MINIMUM BEAMWIDTH REQUIREMENTS MINIMUM EARTH ANTENNA BEAMWIDTH = 0.1 DEGREE MINIMUM SPACE ANTENNA BEAMWIDTH = 1 DEGREE - DB BELOW ONE WATT 80 80 90 90 EARTH ANTENNA DIAMETER DIAMETER LIMITED TO 1 METER FREQUENCY DEPENDENCE OF AVAILABLE SIGNAL POWER AS MINIMUM BEAMWIDTH VARIES FOR ANTENNAS OF LIMITED PHYSCIAL SIZE |