Wide band active antenna system radio

A method for operating an active antenna system, comprising:

• determining an operating radio frequency band, out of at least two radio frequency bands, on which a transmission or reception is to be made;
• providing transmission signals to and/or obtaining reception signals from radio transceiver arrangements of at least two radio chain entities of one of at least two levels of radio chain entities, associated to a frequency range encompassing said operating radio frequency band;
• each of said levels of radio chain entities being associated with a respective frequency range encompassing at least one radio frequency band each;
• wherein at least two radio chain entities of a lower level of radio chain entities are comprised in a radio chain entity of a next higher level of radio chain entities;
• each radio chain entity of said at least two levels of radio chain entities comprising a respective radio transceiver arrangement being connected to a respective one of a number of antenna multiplexers;
• wherein, for all radio chain entities except a lowest level of radio chain entities, said respective radio transceiver arrangement being connected to said respective one of said number of antenna multiplexers via a splitter arrangement;
• and
• providing transmission signals to and/or obtaining reception signals from N1 antenna subarrays of an antenna array via said antenna multiplexers;
• wherein said antenna array comprises N1 combinations of antenna subarrays and available polarizations thereof.