Patent ID: 6993286
Filing Date: 2006-01-31
Classification: H03F,H04B

Abstract:
1. A dual-band bi-directional amplifier for amplifying radio signals in a plurality of frequency bands comprising: a bi-directional amplifier chain for amplifying signals in a downlink direction from a first antenna to a second antenna and in an uplink direction from said second antenna to said first antenna; a first circulator having a plurality of ports, one of said ports connected to the first antenna; a second circulator having a plurality of ports, one of said ports connected to the second antenna; a plurality of sets of duplexers, each of said duplexers separating signals for one of said plurality of frequency bands into the uplink direction and the downlink direction, said duplexers having a plurality of ports corresponding to each of the uplink and downlink directions, wherein a duplexer of the first set of said duplexers is connected to the first circulator, and another duplexer of the first set of said duplexers is connected to the second circulator, and wherein a duplexer of the second set of said duplexers is connected to the first circulator, and another duplexer of the second set of said duplexers is connected to the second circulator; the input of said bi-directional amplifier in the uplink direction being connected to uplink ports of the duplexers connected to the second circulator, and the output of said bi-directional amplifier in the uplink direction being connected to the uplink ports of the duplexers connected to the first circulator; and the input of said bi-directional amplifier in the downlink direction being connected to downlink ports of the duplexers connected to the first circulator, and the output of said bi-directional amplifier in the downlink direction being connected to the downlink ports of the duplexers connected to the second circulator.