Patent ID: 7701401

Claim:
An antenna device, provided in a radio apparatus having a printed circuit board and including a first system and a second system which are different from each other, the antenna device comprising: a first antenna element configured to be fed at a first feed portion provided on the printed circuit board, and configured to be grounded at a first short-circuit portion provided on the printed circuit board; and a second antenna element configured to be fed at a second feed portion provided on the printed circuit board, and configured to be grounded at a second short-circuit portion provided on the printed circuit board, wherein: the first feed portion and the second feed portion are connected to the first system and the second system, respectively and separately, the second feed portion is located farther from the first feed portion than from the first short-circuit portion, the second feed portion is located farther than the first short-circuit portion is from the first feed portion, the second feed portion is located farther from the first short-circuit portion than from the second short-circuit portion, and the second feed portion is located farther than the second short-circuit portion is from the first short-circuit portion.