A design method of an ultra-wideband transition from double-sided parallel stripline (DSPSL) to coplanar waveguide (CPW) is\r\nproposed based on analytical expressions of characteristic impedance. ?e conformal mapping is used to obtain the characteristic\r\nimpedance for each section of the transition within 3.7% accuracy as compared with the EM simulation results. An efficient and\r\nclear guideline for the design of the transition is proposed. ?e implemented transition performs less than 0.6 dB insertion loss per\r\ntransition for frequencies from 40 MHz to 12 GHz and less than 1.2 dB insertion loss to 27 GHz, which well exceeds the previous\r\nresults in the literature
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