Coplanar waveguide filters: new design data and case studies

The use of coplanar waveguide (CPW) has been limited by the availability of design data, especially for discontinuities and other special structures such as interdigital capacitors. Such data must be in a form simple enough to incorporate in CAD packages, which analyze designs purely in circuit terms. Accurate models of this kind are particularly important in filter design, an application for which experience with CPW elements is very limited. This paper presents some case studies of a variety of CWP filters designed using extensive design data for the discontinuities