techniques of designing a smart antenna system are described . an antenna system includes at least two integrated antenna units arranged with a predefined angular angle therebetween to form a desired antenna pattern without any significant nulls . according to one aspect of the techniques , at least two sets of antenna units are interlaced but polarized differently to form an integrated antenna unit . each of the antenna units is formed with an array of antennas . the antennas in an array or the antenna units in an integrated antenna unit can be selectively energized to form a desired antenna pattern in accordance with a signal determined from radio frequency signals communicated between a device equipped with the antenna system and another device , where the desired antenna pattern provides an optimized antenna pattern to facilitate seamless or qos communication between the two devices .