Shared Aperture DAB/FM DAB & DAB Shared Aperture Overview Shared Aperture DAB
Some years ago the BBC approached AlanDick with a request to design an antenna that could be fitted into the space occupied by the existing FM antennas.
We then embarked on a development project to find a way of achieving this without any serious effect on the FM antenna. The antenna had to be easy to install, with minimum downtime for the FM services, minimum impact on the FM antenna radiation pattern, and minimum effect on the return loss of the FM. All this while meeting the specification for the DAB antenna! The FM antennas supplied by AlanDick to the BBC are of two types depending on the structure they are mounted on.