Patent ID: 9099768
Filing Date: 2015-08-04
Classification: H01Q

Abstract:
1. An antenna device comprising: a feeding rod unit connected to a feeding unit, in which a radio signal is sent and received to the feeding unit; an end rod unit, disposed at the end of the antenna device, and spaced apart from the feeding rod unit; at least one intermediate rod unit, interposed between the feeding rod unit and the end rod unit; a first helical unit, interposed between the feeding rod unit and the at least one intermediate rod unit; and a second helical unit, interposed between the intermediate rod unit and the end rod unit, wherein cross-section diameters of each rod shape included in the feeding rod unit, the at least one intermediate rod unit, and the end rod unit are the same, wherein each of the first and second helical units comprises a bobbin and a coil, surrounding the bobbin, wherein the bobbin is formed of a mixture of a magnetic material and plastic, the magnetic material having a relative permeability equal to or more than 4, and a permeability loss equal to or less than 0.5 at a frequency equal to or higher than 2 GHz, and wherein when a central wavelength of the radio signal to be sent and received is λ, an entire length of the antenna device is about λ/16.