Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1997-04-17
1998-09-29
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 455 82, 330101, 330103, 330126, 330134, 370277, 370480, H04B 144
Patent
active
058158049
ABSTRACT:
A dual band filter network for a radio communication apparatus is provided. The network has an antenna (212) for receiving and transmitting signals from a first frequency band and a second frequency band. The network has a first duplex pair (202) including a first transmit filter (204) including a first passband and stopband. The first duplex pair (202) also includes a second receive filter (206). The first filter (204) presents a consistent phase in the second passband due to the wide frequency separation between the first filter (204) and the second filter (206). The network has a second duplex pair (202') with similar characteristics as the first duplex pair (202). The network also has a switching circuitry (210) controlled by a switch control voltage (214) for selecting the appropriate filter circuitry. The network can be provided in a small sized, low cost package that also offers improved insertion loss performance.
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Newell Michael A.
Vangala Reddy Ramachandra
Vlahos Constantine
Armstrong Darnell R.
Cunningham Gary J.
Motorola
Raufer Colin M.
Vo Nguyen
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