| 摘要 |
<p>A MIMO antenna apparatus is provided with: an upper housing (11) having slits 11a, 11b); first feed points through which the upper housing (11) itself is excited as antennas (1a, 1b); second feed points through which the slits (11a, 11b) are excited as antennas (2a, 2b); switch circuits (4a, 4b), each of which is connected to one of the first feed points and one of the second feed points, and connects one of the two feed points to an A/D converter circuit (5); a signal level detector circuit (7) detecting signal levels of received radio signals; and a controller (8) that controls the switches (4a, 4b) to change a feed point connected to the A/D converter circuit (5), when the detected signal level is less than or equal to a predetermined threshold value. The slits (11a, 11b) are located between the antennas (1a, 1b).</p> |
