A stacked patch antenna is disclosed which includes a first antenna element and a second antenna element for cooperating with the first antenna element. The base station controller includes a memory for storing subscriber data therein. Further, the magnetic flux density of an insulating converter transformer is set lower than a predetermined level, so that secondary side rectification current normally maintains a continuous mode irrespective of a variation of the load or the input voltage. The impeller and the motor are accommodated in the fan frame.