Patent ID: 11030507

Abstract:
[Problem] To provide an antenna for an RF tag and an RF tag with which a communication distance between reading devices can be extended. [Solution] This antenna for an RF tag is provided with: an insulation member 40; a waveguide element 20 provided on one side of the insulation member 40; a waveguide element 30 disposed so as to face the waveguide element 20 and provided on the other side of the insulation member 40; a power supply unit 50 having one end electrically connected to the waveguide element 30; and a short-circuit unit 60 having one end electrically connected to the wave guide element 20 and the other end electrically connected to the waveguide element 30, wherein the permittivity of an insulation region A1 on the waveguide element 20 side among regions sandwiched between the waveguide element 20 and the waveguide element 30 is different from the permittivity of an insulation region A2 on the waveguide element 30 side among said regions.