Filter assembly and communication apparatus

Details Filter assembly and communication apparatus Filter assembly and communication apparatus

2005-11-29

2005-11-29

Tokar, Michael (Department: 2819)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S101000, C445S060000, C445S072000, C445S060000, C445S060000

Reexamination Certificate

active

06970056

ABSTRACT:
A filter assembly includes a transmission filter, a reception filter, a change-over switch, and phase circuits. The transmission filter has first and second ends electrically connected to a first antenna terminal and a transmission terminal, respectively. The reception filter has a first end electrically connected to a second antenna terminal via the change-over switch, and a second end electrically connected to a reception terminal. A main antenna is connected to the first antenna terminal, and a diversity antenna is connected to the second antenna terminal. The change-over switch performs switching control to connect the reception filter to one of the first and second antenna terminals. Thus, the filters utilize a fixed number of resonators regardless of switching control of the change-over switch, thereby achieving optimum filter characteristics.

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Copy of The People's Republic of China Office Action dated Mar. 5, 2004 (and English translation of same).

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