ANTENNA FOR HIGH-FREQUENCY RADIO, HIGH-FREQUENCY RADIO DEVICE AND HIGH-FREQUENCY RADIO DEVICE OF WATCH TYPE

摘要

An antenna for high frequency radio comprises antenna elements so arranged on the surface of a circuit board as to have a curved part, when viewed from above, along the periphery of the circuit board having a curved part along the periphery, and a ground pattern for grounding the antenna elements. The ground pattern may be arranged with a constant distance to the antenna elements in the surface direction of the board. Furthermore, the ground pattern may be formed on the surface of the circuit board almost over the entire region thereof except the part where the antenna elements are provided. The circuit board is a multilayer circuit board and the ground pattern may be formed in any one inner layer substantially over the entire region thereof except a region corresponding to the part where the antenna elements are provided.