| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact antenna device that facilitates designing, capable of receiving circularly-polarized wave or elliptically-polarized wave. SOLUTION: The antenna device includes: an antenna element part; a signal branching filter which is electrically connected to the antenna element part; and a signal synthesis part electrically connected to the signal branching filter, wherein the signal branching filter separately takes out two signals in a differential mode and a common mode to be generated in the antenna element part by maintaining high isolation, and the signal synthesis part synthesizes the two taken-out signals by providing desired phase difference. COPYRIGHT: (C)2011,JPO&INPIT
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