Antenna technology for frequency reuse satellite communications

Abstract

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.

Mitigation of rain and ice particle cross polarization at RF for dual circularly polarized waves

“…Papers have been published describing various methods of reducing the adverse cross-polarizing effects caused by rain [2], [14], [15]. Some methods achieve this objective by modifying the RF portion at the input of the receiver.…”

“…This will degrade the net G/T of the receiver, but this degradation can be mitigated by amplifying the incoming signals prior to the restoration circuit at RF. A cross polarization cancellation method has been described that utilizes dual cross-coupling circuits between the two "orthogonally" polarized output channels [2], [14], [15].…”

A Novel Meander Line Microstrip Log-Periodic Dipole Antenna for Dual-Polarized Radar Systems

“…For implementing frequency reuse, the basic requirement is to have good isolation between the two ports providing the polarization diversity, else it may lead to inter-channel interference [9]. In such systems, maximum performance occurs when the two polarizations are orthogonal and the antenna features high isolation between the two polarization [10].…”

Satellite Communication Technology-Challenges for the 1980s

“…With the increasing demands placed on the available frequency bands, consideration was given to reuse of the frequency bands. 18 A measure of the increasing reuse is the equivalent bandwidth being derived from the 500 MHz bands in the 6/4 satellite bands, see Table 2.…”