|7135944||Branching filter having both saw ladder and dual mode filters, and electronic apparatus using the branching filter|
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...
An antenna duplexer (14′) comprises a transmission (TX) filter (16) having an input and an output. The TX filter input is arranged to connect to a TX port of a mobile telecommunications handset and the TX filter output is arranged to connect to an an...