| 摘要 |
A transponder is provided capable of having desired characteristics by a method for forming a resonance circuit, despite the fact that its cost is low and its structure is simple. An antenna circuit is provided in the transponder and comprises an antenna conductor having a predetermined conductor pattern formed on the front surface of a substrate and a sheet metal disposed on the rear surface of the substrate. A part of the sheet metal is provided with a slit so formed that its start end and terminal end are opened to the area at which the sheet metal does not exist.
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