Compact microstrip decoupling and matching network for two symmetric antennas

A novel and compact decoupling and matching network (DMN) is proposed for two symmetric antennas. The DMN is designed and analysis by the lumped-element circuit and the even/odd mode analysis proved the feasibility of the network for a two-element closely spaced array. Then the network is fulfilled by a microstrip line. The measurement results (both with the advanced design system and the high frequency structure simulator) agree quiet well with the simulation ones. High antenna isolation and good matching are achieved simultaneously. The design concept, formulation and experimental results are introduced.