In this paper a waveguide to stripline transition structure for Kaband is proposed. In this designs, waveguide to stripline transition are realized in multilayer circuit board, which are coupled and matched through elliptical slots and two elliptical metal patches . The proposed structure is designed by software and the backtoback transition is simulated, fabricated and tested. The measurements of the designs exhibit that the input and output return loss less than -10 dB and the insert loss less than 1.2 dB between 32.3 and 38.3 GHz. The results show that this proposed structure has a good performance , 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.