Duplexer with a ladder filter and a multimode filter on the...

Details Duplexer with a ladder filter and a multimode filter on the... Duplexer with a ladder filter and a multimode filter on the...

2006-04-11

2006-04-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07026890

ABSTRACT:
A duplexer includes a ladder filter and a multimode filter that are formed on the same surface of a predetermined substrate. In this duplexer, a first comb-like electrode of the ladder filter and a second comb-like electrode of the multimode filter have the same layer structure with the same film thickness. The first comb-like electrode and the second comb-like electrode are formed with single-layer films mainly containing aluminum. The relationship among the film thickness h of the first comb-like electrode and the second comb-like electrode, the center frequency f1of the frequency band of the ladder filter, and the center frequency f2of the frequency band of the multimode filter, is expressed as:in-line-formulae description="In-line Formulae" end="lead"?300≦h×f1≦480in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?300≦h×f2≦430.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 5874869 (1999-02-01), Ueda et al.
patent: 2002/0109561 (2002-08-01), Iwamoto et al.
patent: 2003/0214369 (2003-11-01), Kearns
patent: 2004/0075511 (2004-04-01), Inoue et al.
patent: 2004/0155730 (2004-08-01), Iwamoto et al.

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