Patent ID: 6987485

Claim:
A built-in antenna for a radio communication terminal, comprising: a grounded conductor, incorporated in a package of the radio communication terminal, that forms a tabular plane; a dipole antenna provided with an antenna element connected to said grounded conductor; and balance-to-unbalance transforming means for matching impedance between said dipole antenna and said grounded conductor and transforming an unbalanced signal to a balanced signal or vice versa, wherein: said dipole antenna comprises a bar-shaped antenna element and a rectangular-wave-shaped antenna element, said bar-shaped antenna element is provided outside said package in such a way that the axial direction thereof is parallel to the longitudinal direction of said tabular plane of said grounded conductor, and said rectangular-wave-shaped antenna element is provided inside said package in such a way that the longitudinal direction thereof is parallel to the longitudinal direction of said tabular plane of said grounded conductor.