| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna system, such as, metal-adaptive radio tag that has superior performance even if it is small-sized, and to provide an EBG structure sheet that actualizes the system. <P>SOLUTION: Unit cells 220a and 220b of a peripheral part among unit cells of an EBG structure 210, included in the EBG structure sheet, are made different in the structure from unit cells 220c of a center part, and an in-phase reflection frequency of the unit cells 220a and 220b is made lower than that of the unit cell 220c, thereby to enhance the orientation of the reflected waves of the EBG structure 210. <P>COPYRIGHT: (C)2009,JPO&INPIT |
