Design of Coplanar Micromachined Microwave Circuits

An approach to the design of microwave and millimeter wave coplanar waveguide (CPW) circuits is here described, stressing the advantages and the drawbacks in using a commercial software package, namely the Hewlett Packard Microwave Design System (HP-MDS). It will be shown that satisfactory results in the modeling of lumped elements and filters can be obtained by using coupled microstrips as an approximation of CPW configurations at least up to 40 GHz.