The groundplane andsubsti-atefinirudes are examined on the propagation characterktics oJplanar interconnections using thefnite element method The observed effects, for both truncations, are quantified and explained for the microshp, coplanar waveguide (CPW and shipline structures.

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A compact 5OOGHz SlS heterodyne radiometer is currently being developed at the Rutherford Appleton Laboratory (RAL), UK. The radiometer will be integrated with a new state-of-the-art balloon borne terahertz and sub-millimetre wave limb sounder (TELIS) and will perform remote sounding of key molecular constituents within the Earth's atmosphere . The paper presents the design concept of the receiver and current status of development.

We describe the inclusion of parametric behavioral macromodels within the Transmission-Line Modelling (TLM) method. The macromodels reproduce the input/output port nonlinear behavior of digital integrated circuit (IC). They are integrated in the 3D electromagnetic full-field code Minisolve either through a current source or conductance of the medium. The numerical results are compared to experimental data.