ANTENNA UNIT AND WIRELESS COMMUNICATION APPARATUS

摘要

There are provided a compact and low-cost antenna device in which no interference occurs even when many antenna units corresponding to various systems are mounted close together in a small area, and a wireless communication apparatus including the antenna device. An antenna device 1 includes antenna units 3, 4, and 5 mounted on a single dielectric base 2. The antenna unit 3 having a lowest fundamental frequency is disposed at a left end of a non-ground region 101, the antenna unit 4 having a fundamental frequency closest to a frequency of harmonics in the antenna unit 3 is disposed at a right end of the non-ground region 101, and the antenna unit 5 having a fundamental frequency between those of the antenna unit 3 and antenna unit 4 is disposed between the antenna units 3 and 4. Then, a current-density control coil 6 is connected between a radiation electrode 31 and a power feeder 30 of the antenna unit 3, while a reactance circuit 7 is disposed in the middle of the radiation electrode 31. Preferably, a notch 20 is disposed between the radiation electrode 31 and a radiation electrode 41 and between the radiation electrode 31 and a radiation electrode 51.