Patent ID: 8583052

Claim:
A wireless communication apparatus, comprising: a first antenna apparatus that has a plurality of first radiation patterns different from each other; a second antenna apparatus that has a plurality of second radiation patterns different from each other; and a controller that sets radiation patterns of the first and second antenna apparatuses by changing over the radiation patterns of the first and second antenna apparatuses, respectively, wherein, when the controller sets the first and second antenna apparatuses to have predetermined radiation patterns, respectively, the controller measures a first received signal level of a wireless signal received by the first antenna apparatus and a second received signal level of a wireless signal received by the second antenna apparatus, wherein, based on measured first and second received signal levels, the controller sets a detection time interval of received electric field at the wireless communication apparatus so that the detection time interval decreases with an increase in the received electric field and increases with an increase in a time-lapse change in the received electric field, and sets a changeover threshold of each of the radiation patterns so that the changeover threshold decreases with the increase in the received electric field and increases with the increase in the time-lapse change in the received electric field, and wherein the controller calculates a linear combined value of the first and second received signal levels every set detection time interval, and controls the first and second antenna apparatus to have a further radiation pattern combination when the controller successively detects by a set changeover threshold that a calculated linear combined value is equal to or smaller than a predetermined value.