Branching filter having both saw ladder and dual mode...

Details Branching filter having both saw ladder and dual mode... Branching filter having both saw ladder and dual mode...

2006-11-14

2006-11-14

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07135944

ABSTRACT:
A duplexer includes two surface acoustic wave filter having different band center frequencies, and a phase matching circuit that matches the phases of the two surface acoustic wave filters to each other. In this duplexer, one of the two surface acoustic wave filters is a ladder type surface acoustic wave filter, while the other one of the two surface acoustic wave filters includes two or more dual-mode type surface acoustic wave filters that are connected in parallel.

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International Search Report PCT/ISA/210 dated Nov. 26, 2002.

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