Antenna loop configuration for more efficiently surrounding the high intensity area of the magnetic field produced by an IC card

Abstract

A communication device including a device-side antenna 30 for wireless communication with an IC card 10 including a card-side antenna 11 wound in a rectangular form. The antenna 30 is formed in one or multiple loops. During the wireless communication with the IC card 10 having an inner perimeter with a long dimension of 69 mm and a short dimension of 38 mm at a distance of 25 mm, an inner perimeter of the antenna 30 is formed at a position at which intensity H of a magnetic field produced by the card-side antenna 11 in a direction perpendicular to a surface on which the antenna 30 is disposed is in a range expressed by inequation (1): 0.037I/4Π<H<0.063I/4Π  (1) where I is a current of the card-side antenna [A] and Π is pi.

Dependencies are inferred from the claim text.