Filter circuit and transmitter and receiver using the same

Details Filter circuit and transmitter and receiver using the same Filter circuit and transmitter and receiver using the same

2006-03-14

2006-03-14

Cho, James H. (Department: 2819)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S204000

Reexamination Certificate

active

07012479

ABSTRACT:
A filter circuit filters unnecessary frequency components within a signal. The filter circuit includes a first and a second line pattern and a closed loop pattern portion. The first line pattern has two ends and one end thereof is connected to an input terminal and the other is opened or grounded. The second line pattern has two ends and one end thereof is connected to an output terminal and the other being opened or grounded. The closed loop pattern portion, which is interposed between the first and the second line pattern, has two or more closed loop patterns and each of the closed loop patterns has an electromagnetic coupling portion coupled to each of the first and the second line pattern.

REFERENCES:
patent: 5703546 (1997-12-01), Takahashi et al.
patent: 6052495 (2000-04-01), Little et al.
patent: 6108569 (2000-08-01), Shen
patent: 6825742 (2004-11-01), Luque
patent: 03228402 (1991-10-01), None

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