A broadband microstrip to coplanar waveguide (CPW) transition is proposed. The design is based on vertical resonant coupling between the microstrip and CPW. The transition does not require via holes, wire bonds, or air bridges. The design of the transitions on C band shows good agreement with return loss better than –15 dB over 2.8–7.5 GHz. The new transition has the advantages of broad bandwidth and easy fabrication.
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T. H. Lin (2001) studied this question.
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