ANTENNA DEVICE AND COMMUNICATION DEVICE USING THE ANTENNA DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an antenna device which can improve its gain and also can reduce characteristic changes caused by an external environment such as the case that the antenna device is placed adjacent to the ground conductor. SOLUTION: A surface mount antenna 5 and a monopole antenna 23 are power-fed from the same power feeding point and at the same time, the direction of an open end 11a set on the basis of the round end of a radiation electrode 11 of the antenna 5 and the direction of an open end 23b set on the basis of the power feeding end 23a of the antenna 23 are arranged oppositely to each other. Thereby, a change in the characteristic is minimized regardless of the external environment for the antenna device.