A rotatable microstrip patch antenna and an array antenna using the same is disclosed. A rotatable microstrip patch antenna, includes: a first substrate layer capable of being predetermined angle rotated toward a predetermined direction for inputting and outputting a transmitting/receiving signal; a second substrate layer arranged bottom of the first substrate layer with a predetermined distance space for transmitting and receiving signals to/from the first substrate layer; and a signal transferring unit for allowing a rotation of the first substrate layer and transferring the signals between the first substrate layer and the second substrate layer.