The present invention relates to an antenna having an complex internal structure, and more particularly to an antenna having an complex internal structure which increases antenna design convenience through an extension at an available area of the antenna and can easily form a customized antenna structure with respect to a multi-band by composing the antenna with only a conductive metal body and providing the antenna which can freely design an antenna structure so as to assure optimum reception sensitivity according to band characteristics. The present invention can assure design autonomy according to the band characteristics and can largely improve a bandwidth control characteristic by arbitrarily controlling intensity and characteristics according to an increase of a contact area between a radiator disposed perpendicularly to a printed circuit board and a dielectric used for fixing the radiator.
