Transmission circuit, antenna duplexer, and radio-frequency...

Details Transmission circuit, antenna duplexer, and radio-frequency... Transmission circuit, antenna duplexer, and radio-frequency...

2006-02-27

2009-08-25

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S128000, C333S129000

Reexamination Certificate

active

07579929

ABSTRACT:
A small-sized, high-performance transmission circuit is provided which avoids degradation in transmission line characteristics caused by coupling, due to a transmission line and a leader electrode to an external electrode which are oppositely facing, of the electromagnetic field induced by the transmission line and the electromagnetic field induced by the leader electrode. In order to attain the aforementioned object, the present invention comprises a first shield layer which is a first ground electrode, a second shield layer which is a second ground electrode, and a spiral-shaped transmission line facing the first shield layer and the second shield layer which is disposed between the first shield layer and the second shield layer. The spiral portion of the transmission line, when viewed from the top face or the bottom face of the transmission line, is disposed on the inside of the first shield layer and the second shield layer.

REFERENCES:
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patent: 6861923 (2005-03-01), Kolehmainen et al.
patent: 6998938 (2006-02-01), Lin et al.
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patent: 41 19 551 (1992-01-01), None
patent: 5-29819 (1993-02-01), None
patent: 05-029819 (1993-02-01), None
German office Action issued in corresponding German Patent Application No. DE 10 2006 008 500.0-0-35, dated May 30, 2007.

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