16 pages matching downlink antenna in this book
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REQUIREMENTS FOR LAND MOBILE SATELLITE SYSTEM
DEVELOPMENT OF BEAM TOPOLOGY PLAN
5 other sections not shown
achieved allows antenna diameter antenna gain aperture antenna approximately assumed axis bandwidth beam forming network beam topology plan boundary cellular system channels per beam circular polarization compatible component beams configuration contour gain dB beam isolation diplexer distribution downlink antenna dual polarization Eastern time zone EIRP fading margin feed array feed panel four frequency four sub-apertures four-element sub-array frequency band gain contour geometry interfered cell Land Mobile Satellite layout LMSS maximally scanned beam maximum mobile user mounted solar array noise temperature offset fed optics overall aperture paraboloid parasitic sidelobe patches percent polarized radiating elements Population density quad antenna quad aperture resultant C/I S-band antenna S-band base stations S-band beam topology selected seven-element feed cluster shown in figure SIDELOBE CONTROL sidelobe level singlet beam singular polarized radiating solar array implementation spacecraft sub-aperture diameter sub-bands traffic UHF band UHF feed UHF uplink uplink and downlink utilization voice channels