ANTENNA DUPLEXER, METHOD FOR DESIGNING ANTENNA DUPLEXER, METHOD FOR PRODUCING ANTENNA DUPLEXER, AND COMMUNICATION APPARATUS USING IT

摘要

PROBLEM TO BE SOLVED: To solve a problem with an occurrence of a signal loss in a pass band of a filter.

SOLUTION: The antenna duplexer comprises a transmission filter 1101, a reception filter 1102, phase circuits 103,104 for adjusting a phase characteristic on a transmission side and a reception side, and a connection point 1106 for connecting with an antenna 1105. An absolute valueθ1 of a difference between a first phase at a specified frequency of the pass band of the transmission filter and a second phase at a specified frequency when the reception filter side is viewed from the connection point and an absolute valueθ2 of a difference between a third phase at a specified frequency of the pass band of the reception filter and a fourth phase at a specified frequency when the transmission filter side is viewed from the connection point are set in a range of 100 degrees or more to 170 degrees or less.

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