Antenna device and communications terminal device

摘要

Disclosed are an antenna device and a communications terminal device with great freedom of radiation plate shape, no requirement for high positioning precision in the positional relationship between radiation plates and coil conductors, and little susceptibility to influence from metal items in the vicinity, wherein: a current (i10) is induced to a first booster conductor (41) by a current (i0) that flows to a coil conductor in a power-feed antenna (30) and said current (i10) flows around the first booster conductor (41); a current (i2) is induced to a second booster conductor (42) by the current (i0) that flows to the coil conductor in the power-feed antenna (30) and said current (i2) flows around the second booster conductor (42); and a current (i12) is induced to the first booster conductor (41) by the current (i2) that flows to the second booster conductor (42) and said current (i12) flows around the first booster conductor (41).