Two multiple-antenna-port and multiple-user-port antenna tuners

Two multiple-antenna-port and multiple-user-port antenna tuners are studied and compared. The first one is made up of independent and uncoupled single-antenna-port and single-user-port antenna tuners, each having the structure of a π-network. The second one is new. It cannot be separated into independent and uncoupled antenna tuners and it has the structure of a multidimensional π-network. It is shown that, unlike fixed matching and/or decoupling networks and unlike the first antenna tuner, the new antenna tuner is able to provide an ideal match at any frequency in a frequency band of intended operation.