Aiming at microstrip to stripline transition in multilayer designs,a broadband vertical microstrip to stripline transition via electromagnetic coupling is proposed. In this designs, microstrip to stripline transition is formed by two elliptically patches, which are broadside coupled and matched through circular slots,and then realizes the transmission of microwave signal in different layers. The proposed structure is designed by software and the backtoback transition is simulated, fabricated and tested. The measurements of the designed devices exhibit that the return loss in the order of 12 dB or better and the best insert loss is 1.48 dB. The results show that this proposed structure has a good performance, and the structure is simple and the processing is convenient and so on. All this indicates the structure has a good applicable worthiness in microwave circuit designs.