Patent ID: 8125390

Claim:
A small-size wide band antenna comprising: a radiating element formed on a dielectric substrate; and a power supply unit for supplying dipole potential to the radiating element, wherein the radiating element includes a ground potential section having a power supply point to which a ground potential is supplied from the power supply unit and an opposite-pole potential section having a power supply point to which a potential forming a pair with the ground potential is supplied from the power supply unit, wherein each of the ground potential section and opposite-pole potential section includes a pair of conductors which are formed in a tapered shape on front and rear surfaces of the dielectric substrate and are mutually capacitively coupled, and the power supply points of the ground potential section and opposite-pole potential section are positioned at tapered apexes of the conductors formed on the same side of the dielectric substrate, wherein the pair of conductors constituting each of the ground potential section and opposite-pole potential section are arranged such that each conductor has substantially a right angle shape in which one of the sides forming the tapered shape is set as the hypotenuse and that the hypotenuse of one conductor crosses that of the other conductor.