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In this paper, broadband transitions from substrate integrated coaxial line (SICL) to a conductor-backed coplanar waveguide (CBCPW) are proposed and designed. Measurement results show that the insertion loss and return loss are better than i0:5dB and i10dB, respectively from 0 to 13GHz. Then, for verifying the performance of SICL and the validity of SICL transition design, a 3dB SICL rat-race coupler operating at 2.3GHz is designed, fabricated, and measured. Compared with the conventional microstrip line coupler, this SICL coupler maintains good performance but with a remarkable 24% reduction in size. At last, a 10dB dual-band coupled SICL coupler operating at 2.4/5.8GHz is proposed, and the measured results agree well with the schematic and electromagnetic simulated results. The measured results demonstrate that the fabricated bandwidths are 30% and 12.8%, the jS31j are i10:1dB and i10:3dB, the directivities are 18dB and 20dB at the low (2.4GHz) and high (5.8GHz) operating frequencies, respectively. Compare with the dual-band coupled microstrip line coupler, performance of the dual-band coupled SICL coupler is enhanced.

BROADBAND SUBSTRATE INTEGRATED COAXIAL LINE TO CBCPW TRANSITION FOR RAT-RACE COUPLERS AND DUAL-BAND COUPLERS DESIGN