| 摘要 |
PURPOSE: A duplexer circuit is provided to improve a characteristic of an LTCC(Low-Temperature Co-fired Ceramic) module by mounting an inductor or a capacitor on a surface of the LTCC module. CONSTITUTION: A diplexer(200) performs a filtering function for transmitting and receiving two frequency band signals. A first transmitting terminal is used for transmitting a high frequency band signal. A second transmitting terminal is used for transmitting a low frequency band signal. A first filter(201a) is serially connected to the first transmitting terminal. A second filter(201b) is serially connected to the second transmitting terminal. A first phase shifter(203a) is serially connected to a first receiving terminal. A second phase shifter(203b) is serially connected to a second receiving terminal. First and second tuning parts(205a,205b) are connected to both sides of the first and second phase shifters.
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