With the rapid development of wireless communication，mobile subscribers have

increasing requirements of the system capacity and communication quality．Therewith，

the design of the base station antenna，which is a vital component of a wireless system，

should take jnto account many factors．In the next generation of wireless

communication，the application of MIMO technologies increases the system capacity

linearly with the minimum number of transmit and receive antennas．As the M1M0

system implies multiple antennas in both transmit and receive sides，the design of

multiple antennas becomes very important in the next generation of wireless

communication．