Patent ID: 7079030

Claim:
A microwave sensor comprising: transmitting means for transmitting a plurality of microwaves having different frequencies to a detection area; receiving means for receiving reflected waves of the microwaves reflected from the detection area; object detecting means for detecting if an object is present in the detection area based on the reflected waves; and object determining means for determining whether or not the object detected as being present in the detection area is an object to be detected based on a moving direction of the object in the detection area; wherein said object determining means determines that the object present in the detection area is not an object to be detected when movement amounts of the object moving to at least two different directions in the detection area are simultaneously detected, and the movement amounts of the object to the at least two different directions are at least a first predetermined amount that has been previously set; and wherein said object determining means calculates the movement amounts of the object to the at least two different directions by integrating an advance distance in the detection area and a receding distance in the detection area.