Patent ID: 7158086
Filing Date: 2007-01-02
Classification: H01Q

Abstract:
1. A monopole antenna comprising: a ground plane; a flat conductor faced to the ground plane and separated from the ground plane by a predetermined clearance, the flat conductor having an inner conductor and an outer conductor that is disposed around the inner conductor and separated from the inner conductor by another predetermined clearance; a linear conductor coupled to the flat conductor, the linear conductor extending on a ground plane side in an insulated state from the ground plane and being coupled to a feeding point; and at least one coupling conductor at a region of the another predetermined clearance for inter-coupling an outer edge of the inner conductor and an inner edge of the outer conductor, wherein the outer conductor includes a first outer conductor disposed at an outer periphery of the inner conductor with the another predetermined clearance therebetween and a second outer conductor disposed at an outer periphery of the first outer conductor with a predetermined interval therebetween, the coupling conductor is a plurality of coupling conductors respectively disposed in between the inner conductor and the first outer conductor and in between the first outer conductor and the second outer conductor, and each of the coupling conductors coupling the inner conductor to the first outer conductor and the first outer conductor to the second outer conductor is formed with a set angle and each resonates with different set frequency.