Numerical studies of EBG structures printed on CPW lines

One of the current topics in computational electromagnetics is the study of electromagnetic band-gap (EBG) structures using planar printed transmission lines. In fact, structures using microstrip-line circuits have been comprehensively applied in recent years. However, studies involving transmission lines using the coplanar waveguide (CPW) have not been commonly conducted. In this paper, a number of EBG structures constructed on the CPWs are studied by using a well-known numerical method, the finite difference time domain (FDTD) method. Results show the band-stop filter behavior of these structures, and the computed results match generally well with the ones published in literature through solver validation. The proposed CPW EBG structures may be considered as alternatives to the conventional microstrip-line typed EBGs.