Analysis and modeling of a broad-band CPW to slotline transition in THz frequency

This paper analyzes a brand-band coplanar waveguide (CPW) to slotline transition using slotline ring only in THz band, which is a useful component in uniplanar MMIC applications. Two different types of air bridges were studied, which could suppress the slotline mode in CPW and widen the bandwidth. The paper shows a slotline ring fed by CPW printed in the center conductor of the CPW. Compared with the slotline ring printed in the ground plane, the proposed transitions have additional degrees of freedom, wider bandwidth and reduce the number of air bridges.