As the variety and sophistication of data-intensive wireless service grows explosively, bandwidth efficient communication techniques, as polarization diversity and MIMO technology, have gained great interest. Dual-polarized antenna is superior over the mono-polarized one. It can overcome multipath effects and transmit twice more information in wireless communication. Several dual-band dual polarized micro strip antennas are proposed. Multiple-Input Multiple-Output (MIMO) technology, which is the key technology for the Fourth Generation mobile communication system (4G), has potential of increasing capacity without sacrificing additional spectrum.