| 摘要 |
An antenna device comprises an antenna section and a filter section which are formed in an integrated manner in a dielectric substrate, wherein the antenna section and the filter section are coupled to one another via a capacitance. Further, 0.3xLr<=Lt<=1.2xLr is satisfied provided that an antenna length of the antenna section is Lt, and an antenna length measured for a single antenna is Lr. Accordingly, it is possible to realize a small size of the antenna device while avoiding the decrease in gain and the disadvantage of narrow band.
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