PROJECT TITLE :
Vialess vertical microstrip-to-microstrip transition using open slot-line
A replacement wide-band, low-loss and compact vertical microstrip-to-microstrip transition is presented. The proposed structure consists of two quarter-wavelength open-circuited microstrip lines and a quarter-wavelength open slot-line etched on the common ground plane. The theoretical analysis primarily based on equivalent-circuit model reveals that the proposed transition exhibits ultra-wide passband with three transmission poles. To effectively enhance the bandwidth, the optimised parameters are obtained by the transmission poles separations. Finally, a transition having a good fractional bandwidth of 114% is achieved with the compact size of eight.75 mm × four.2 mm. Predictions are well verified by measurements over a large frequency vary.
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