ANTENNA AND RADIO TAG

摘要

There are provided an antenna and a radio tag whose size can be reduced while maintaining the impedance compliance and communication characteristics. The antenna includes: a feed meander line unit (72) formed by a meander-shaped linear conductor using a connection portion to an IC circuit unit (54) as a feeding unit (ES); and a parasitic meander line unit (74) formed by a meander-shaped linear conductor having no feeding unit for the IC circuit unit (54) and arranged at a position affecting the input impedance of the feeding meander line unit (72). By arranging the parasitic meander line unit (74) at an appropriate position, it is possible to set the input impedance of the feeding meander line unit (72) near the input impedance of the IC circuit unit (54), thereby suppressing the compliance loss when reducing the size of the radio tag (12) to which the antenna (52) is employed without lowering sensitivity or characteristics such as a communication distance.