• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.8
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• pp.701-708
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• 2016

A new design for an ultra-wideband microstrip-to-FGCPW(Finite Ground Coplanar Waveguide) transition is presented. The proposed transition provides the electric field and impedance matching between adjacent transmission lines by ground shaping. The transition is designed on the analytical expressions of whole transitional structure. Conformal mapping is applied to obtain the characteristic impedance of FGCPW with bottom aperture within 3.3 % accuracy as compared with the EM-simulation results. As design example, the fabricated transition in back-to-back configuration provides insertion loss less than 1 dB per transition and return loss better than 10 dB for frequencies from 9 GHz to over 40 GHz.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.7
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• pp.809-818
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• 2007

Generally, carriers on which microwave circuits are mounted are used as building blocks of MIC module for the convenience of MIC assembly and the unit module characterization. However the interconnection of the microstrip-based carriers by wire bonding causes the serious problem of mismatch and results in the higher insertion loss as frequency becomes higher. The gap and the depth between carriers are considered as the main reason of the degradation. The CPW can be the solution to cope with such problem considering its field are dominantly concentrated on the top plane. In this paper, we propose and demonstrate the CBFGCPW to microstrip transition with the low insertion loss that can be applied without causing the MIC carrier interconnection problem.