ANTENNA STRUCTURE AND WIRELESS COMMUNICATION UNIT HAVING THE SAME

摘要

In an antenna structure 1 in which a feed radiation electrode 7 provided on a dielectric base member 6 performs an antenna operation in a fundamental mode and an antenna operation in a higher-order mode with a resonant frequency higher than that in the fundamental mode, one end of the feed radiation electrode 7 defines a feed end 7A connected to a circuit for radio communication, and the other end 7B of the feed radiation electrode defines an open end. The position of a capacitance-loading portion a is set in advance between the feed end 7A and the open end 7B of the feed radiation electrode 7. A capacitance-loading conductor 12 is connected to one or both of the feed end 7A and the capacitance-loading portion ± of the feed radiation electrode 7. The capacitance-loading conductor 12 forms a capacitance for adjusting a resonant frequency in the fundamental mode between the feed end 7A and the capacitance-loading portion ±.