Comparative studies of three types of coplanar waveguide structures for millimeter-wave applications

Abstract

Three types of coplanar waveguide (CPW) structures with shielding grooves for suppressing surface wave leakage are characterized by using a full-wave mode-matching analysis. Influence of the geometrical dimensions of the groove on their phase constants, characteristic impedances, and single mode frequency bands are investigated. The results reveal that the inverted microshield CPW is particularly attractive for realizing wide band and low dispersion millimeter wave transmission lines and circuits.