Patent ID: 7843394
Filing Date: 2010-11-30
Classification: H01Q,H04M

Abstract:
1. A radio antenna unit, comprising: a ground conductor plate that is provided to a casing of a radio device and has a ground potential; a first radio circuit that handles a system in a first frequency band and a second radio circuit that handles a system in a second frequency band lower than the first frequency band, which are provided in the ground conductor plate; a first feeding line that is connected to the first radio circuit, and is a coaxial transmission line having an inner conductor and an outer conductor which are arranged in perpendicular to or in parallel with the ground conductor plate; a dipole antenna comprising a pair of antenna elements that includes a first antenna element and a second antenna element, wherein the first antenna element of said dipole antenna is connected to the inner conductor of the first feeding line and the the second antenna element of said dipole antenna is connected to the outer conductor of the first feeding line; and a second feeding line that connects the second radio circuit and the outer conductor, wherein at least one of the first and second antenna elements is operable to transmit a radio signal input from each of the first and second radio circuits.