Parasitic elements based decoupling technique for monopole four square array antenna

An alternative approach to port decoupling for the monopole four square array antenna is proposed. In contrast to the decoupling of the monopole four square array antenna based on eigenmodes theory, port decoupling over wider frequency band is obtained by a proper choice of parasitic elements dimensions and positions for a given array elements spacing without extending the overall area. The decoupled ports of the array may then be matched by using conventional matching circuits.