Patent ID: 7425921

Claim:
A broadband antenna system comprising: a ground plane; a metal plate which is parallel to the ground plane, and constitutes a capacitance load against the ground plane; and a radiation structure which is connected perpendicularly to the ground plane and the metal plate, the radiation structure comprising: a feed conductor which supplies an electric signal; a short-circuit stub which transfers the supplied electric signal to the ground plane; a conducting bridge which interconnects the feed conductor and the short-circuit stub, and which is separated and electrically isolated from the metal plate; and a first radiating conductor which is connected to the ground plane and the metal plate, and coupled to the supplied electric signal source to thereby radiate electromagnetic waves, wherein the feed conductor, the short-circuit stub and the conducting bridge are formed on a first plane of the radiation structure, and the first radiating conductor is formed on a second plane of the radiation structures; wherein the first plane is parallel to the second plane, and the first plane does not intersect the second plane.