Patent ID: 8654012

Claim:
A tag antenna comprising: a lower dielectric substrate which is provided at a lower surface thereof with a ground plane and at an upper surface thereof with a microstrip line having an end shorted to the ground plane; and an upper dielectric substrate, which is provided at an upper surface thereof with a plurality of capacitive devices and is stacked on the lower dielectric substrate, wherein the lower dielectric substrate includes two microstrip lines each having an open end, the open ends spaced apart from each other from a middle of the lower dielectric substrate while facing each other to form a radiating slot from which radiation of electromagnetic waves occurs, wherein the upper dielectric substrate includes: a first capacitive device of the plurality of capacitive devices to be stacked on one of the microstrip lines; a second capacitive device and a third capacitive device of the plurality of capacitive devices to be stacked on the other one of the microstrip lines; and a feed terminal which is disposed between the second and the third capacitive devices and used to mount a tag chip.