A Broadband Transition Between Microstrip: A broadband transition between microstrip and coplanar stripline.PDF

A design for a broadband microstrip-to-coplanarstripline
transition using broadside-coupled strips is proposed in
this letter. Two transitions are designed in back-to-back configuration
and the insertion loss is optimized in X-band(8.2 GHz 12.4
GHz). Both simulation and measurement are in good agreement.
The measured bandwidth for 1 dB insertion loss and 20 db return
loss is from 6.9 GHz to 12.4 GHz.

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