satellite systems hrs become h i t e d by the avWk bandwidth One Abrrract-In the past few years, the aprcity of c o m m u a i a h method of o v a c o m i n g this limit.tion is to rewe the bandwidth by employmgsp~y~htedmtennrbe;rmrmd/~ortbogolrrlpol * .. Thir papa surveys the required a a t e n n r k d m o A o g y . The xuuttipkbcrm sp.cecnft mtenru pzobkm is a d -, and the current dm@ statas is sumrmri zed. The eyth temmd rntennr f a 8 d d p o h i z e d system is discused rlarg with pohrivtion measurement kclmiqua P W , circuits for compensating the depohription realthg from prec@%.tion on the proprgrtion path are presented.
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