A new passive isolation component using slot-coupled microstrip lines for simultaneously transmitting and receiving applications

In this paper, three sets of diamond-shape slot-coupled microstrip lines are integrated into a passive isolation component with the phase combination and cancellation properties for simultaneously transmitting and receiving applications. Since the slot-coupled microstrip can provide a wideband and accurate quadrature phase difference, the developed passive isolation component can effectively improve the isolation level and bandwidth between transmitting and receiving ports. The developed isolation component has a 30 dB isolation of 44.9 %.