Telecommunications – Carrier wave repeater or relay system
Reexamination Certificate
2006-01-31
2006-01-31
Maung, Nay (Department: 2684)
Telecommunications
Carrier wave repeater or relay system
C455S011100, C455S012100, C370S315000, C370S316000, C330S126000, C330S295000
Reexamination Certificate
active
06993286
ABSTRACT:
The dual band bi-directional amplifier has only one amplifier chain having an uplink amplifier and a downlink amplifier, but can nonetheless amplify signals from two frequency bands in both an uplink and a downlink direction between two antennas. This is possible by using duplexers and circulators to separate signals to and from each antenna into the two bands. In particular, for each frequency band handled by the circuit, the dual band bi-directional amplifier has a duplexer set for separating the signals from one of the bands into the uplink and downlink direction. In the case of a dual band amplifier, there are two sets of duplexers, one for each band. By using duplexers and circulators to differentiate signals in different bands travelling in different directions, there is no need for additional amplifier chains, which increase the manufacturing costs.
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Wills David L.
Zhen Liping
Dean Raymond S.
Maung Nay
Radio Frequency Systems Inc.
Sewell V. Lawrence
Sughrue & Mion, PLLC
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