Wideband coplanar stripline to double-sided parallel-strip line transition

A novel wideband transition between the coplanar stripline and the double-sided parallel-strip line is presented. The simple transition consists of two tapered lines, one located on the top layer and one tapered line on the bottom layer. Through the proposed transition, horizontally distributed electric fields of the coplanar stripline become rotated by 90deg to match the vertically distributed fields of the double-sided parallel-strip line. Simulated and measured results of a back-to-back transition show good agreement.