Patent ID: 6762728
Filing Date: 2004-07-13
Classification: G04G,G04R,H01Q

Abstract:
An antenna device for a high frequency radio apparatus comprising:a multilayer circuit board having a curved periphery; an antenna element formed as a pattern on a layer of the multilayer circuit board following along the periphery of the multilayer circuit board, and having a near-arc shape when viewed from above; and a ground pattern connected with the antenna element and formed in almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area that the antenna element occupies; and wherein a first line and a second line form an angle less than or equal to 180 degrees, the first line passing through the center of a circle formed in part by the near arc shape and a point where the antenna element is connected with the ground pattern, the second line passing through the center of the circle and a tip of the antenna element.