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Broad-band microstrip-to-CPW transition via frequency-dependent electromagnetic coupling

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2 Author(s)
Lei Zhu ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Menzel, W.

An improved broad-band microstrip-to-coplanar-waveguide (CPW) transition is developed on a basis of the frequency-dependence characteristic of an electromagnetic surface-to-surface coupling. A self-calibrated method of moments is extended to model this unbounded two-port discontinuity with the two dissimilar microstrip/CPW feeding lines. Numerical results are provided to demonstrate its frequency response of transmission under varied strip/slot dimensions and further exhibit its attractive ultra-broad-band transmission with low radiation loss. Next, the back-to-back transition circuits with the two different lengths are fabricated and measured to deembed in experiment the S-parameters of two single-transition structures. Predicted and measured results show good agreement with the return loss less than -10dB over the frequency of 3.2-11.2 GHz.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:52 ,  Issue: 5 )