Patent ID: 8294622

Claim:
An array antenna apparatus comprising: a first antenna element connected to a first feeding point, the first antenna element resonating at a first frequency; and a second antenna element connected to a second feeding point, the second antenna element resonating at the first frequency, a first connecting line for electrically connecting the first connection point located in the first antenna element with a third connection point located in the second antenna element; and a second connecting line for electrically connecting the second connection point located in the first antenna element with a fourth connection point located in the second antenna element, and wherein an electrical length of each of the first and second antenna elements and an electrical length of each of the first and second connecting lines are set so that a phase difference, between a first high-frequency signal propagating through a first signal path that extends from the second feeding point via the third connection point, the first connecting line and the first connection point to the first feeding point, and a second high-frequency signal propagating through a second signal path that extends from the second feeding point via the fourth connection point, the second connecting line and the second connection point to the first feeding point, becomes substantially 180 degrees at the first feeding point, whereby the array antenna apparatus resonates at a plurality of frequencies including the first frequency and a second frequency higher than the first frequency.