A dual band high isolation antenna structure includes a diplexer unit, a 4-port decoupling module, a first frequency band antenna assembly, and a second frequency band antenna assembly. The diplexer unit is operable to frequency domain multiplex between a first frequency band and a second frequency band. The 4-port decoupling module is operably coupled to the diplexer unit and is operable to isolate a first pair of ports from a second pair of ports. The first frequency band antenna assembly is operably coupled to the diplexer unit and is operable to transceive wireless signals in the first frequency band. The second frequency band antenna assembly is operably coupled to a port in each of the first and second pairs of ports and is operable to transceive wireless signals in the second frequency band.