초록 ▼

A satellite system includes circuitry for forming at least a first and second set of antenna beams for communication with a respective first and second set of mobile stations. Neighboring beams in the first set intersect at an approximately -4 dB down point relative to the central beam peak, thereby

A satellite system includes circuitry for forming at least a first and second set of antenna beams for communication with a respective first and second set of mobile stations. Neighboring beams in the first set intersect at an approximately -4 dB down point relative to the central beam peak, thereby defining for each beam an approximately -4 dB beam circumference having an approximately -4 dB beam diameter. The second set of antenna beams are displaced from the first set of antenna beams by less than the approximately -4 dB beam diameter.

대표청구항 ▼

A system for communicating between one or more central ground stations and a plurality of mobile or portable stations via at least one orbiting satellite comprising: at least one central ground station having transmitter means to transmit a plurality of signals to a satellite for transponding; at le

A system for communicating between one or more central ground stations and a plurality of mobile or portable stations via at least one orbiting satellite comprising: at least one central ground station having transmitter means to transmit a plurality of signals to a satellite for transponding; at least one satellite having multi-channel transponder means for receiving said plurality of signals, frequency translating, filtering and amplifying said signals and forming weighted combinations of said signals for applying after power amplification to a multiple element antenna such that a first subset of said signals will be radiated using a first set of antenna beams having radiation patterns that touch at approximately a -4 dB down point relative to beam peak, said approximately -4 dB down point defining an approximately -4 dB diameter for each of said beams, and such that at least one other subset of said signals will be radiated by another set of antenna beams displaced from said first set of beams by less than the approximately -4 dB beam diameter.