Patent ID: 9337547
Filing Date: 2016-05-10
CPC Classification: H01Q

Claim Text:
1. An internal antenna having a wideband characteristic, comprising: a printed circuit board; a first antenna unit fed with electricity from a feeding unit of the printed circuit board; and a second antenna unit spaced apart from the first antenna unit by a predetermined distance and indirectly fed with electricity by means of coupling to the first antenna unit, wherein the second antenna unit is indirectly fed with electricity with a phase difference from the first antenna unit due to an electric distance from a feeding point of the first antenna unit, wherein the first antenna unit and the second antenna unit are located at one end of the printed circuit board, wherein the internal antenna further comprises a third antenna unit provided at the other end of the printed circuit board and fed with electricity from a feeding unit other than the first antenna unit, wherein the first and second antenna units and the third antenna unit are located on the same side with the printed circuit board being interposed therebetween, wherein the second antenna unit includes: an indirect feeding line of which one end is connected to a ground unit of a common ground of the printed circuit board and indirectly fed with electricity by being spaced apart from the first antenna unit by a predetermined distance; and a second antenna pattern extending from the other end of the indirect feeding line, emitting an electromagnetic wave, which has a resonance frequency different from that of the first antenna unit, outwards, and being disposed on a different plane from the first antenna unit, and wherein the one end of the indirect feeding line is spaced apart from the feeding point of the first antenna unit as much as an electric distance equal to ¼ of a wavelength λ which corresponds to a central frequency of a operating frequency band of the first antenna unit.