| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize an antenna sharing device resulting in contributing to miniaturization of a mobile communication unit. SOLUTION: The antenna sharing device is provided with a package 14 having an antenna terminal 15, transmission/reception terminals 16, 17, and ground terminals 19a-19m, a transmission use surface acoustic wave filter 11 contained in the package 14, a phase substrate 14 connected electrically to the transmission surface acoustic wave filter 11 and a reception surface acoustic wave filter 12 electrically connected to the substrate 13. The transmission/ reception surface acoustic wave filters 11, 12 have a pass band of different frequencies and attenuate the pass band with each other, and the phase substrate 13 has a function of rotating the phase of the transmission band of the reception surface acoustic wave filter 12.
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