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Conductor-backed coplanar waveguide (CBCPW) with lateral sidewalls can support rectangular waveguide modes that couple with the dominant mode and can produce several undesirable results. These modes can be cutoff by reducing the lateral dimensions of the structure but for higher frequency opemtion the available circuit surface area is severely limited. The CBCPW is analyzed with a two-dimensional spectral domain method to demonstmte these coupling effects and the results provide insight to the characteristics of finite length structures.

A time‐delay element associated with the output conductance has been included in the small‐signal GaAs MESFET equivalent circuit to model Gunn domain effects. From experimental data collected to 36 GHz, these effects primarily contribute to decrease of the output conductance (gds) with increasing frequency which significantly affects the magnitude of the S‐parameter S22. © 1992 John Wiley & Sons, Inc.