Patent ID: 8098756

Claim:
A MIMO antenna apparatus comprising: a radiating conductor having a plurality of slits; a plurality of first feed points which are respectively provided on the radiating conductor, and through which the radiating conductor itself is excited as a plurality of different first antennas, respectively; a plurality of second feed points which are respectively provided at the plurality of slits, and through which the plurality of slits are excited as a plurality of second antennas, respectively; a demodulator circuit for demodulating received radio signals by a MIMO (Multi-Input Multi-Output) scheme; a switching circuit including a plurality of switches, each switch connected to one of the first feed points and one of the second feed points, the switching circuit connecting one of two feed points connected to each switch, to the demodulator circuit; and a controller for controlling the switches based on a first and a second signal measurement values of respective received radio signals, wherein, when the first signal measurement value of a radio signal received by an antenna associated with a feed point currently connected to the demodulator circuit by a first switch, which is any one of the switches, is less than or equal to a predetermined threshold value, the controller controls the first switch to change the feed point connected to the demodulator circuit, to the other feed point, and when the second signal measurement value after the change of the feed point has not improved over the second signal measurement value before the change of the feed point, the controller controls the first switch to change again the feed point connected to the demodulator circuit, to the other feed point.