A radio frequency antenna structure includes a base station antenna and an auxiliary
antenna mounted within a common antenna assembly. The base station antenna is configured
to transmit or receive signals in a first frequency range and to develop a main
beam that is substantially wider in azimuth than in elevation, and the auxiliary
antenna is configured to transmit or receive signals in a second frequency range
at least partially overlapping the first frequency range and to develop an auxiliary
beam at least partially overlapping the main beam. Means are included for decoupling
the base station and auxiliary antennas to thereby suppress interference between
the main and auxiliary beams, and for suppressing interference between the auxiliary
antenna and any co-located antennas.
