NEC-LIST: Cliff model

Duncan,

The "cliff option" only works on the radiated field by computing the
reflected wave for the ground height and sigma, epsilon at the point
where the specular ray would bounce. No layered ground is taken into
account, and in filling the matrix only the inner medium parameters
are used. It offers limited accuracy, since diffraction at the cliff
edge is not included. There may be discontinuities in the elevation
pattern as the specular point falls off the cliff, but these are often
smoothed by summing over segments. Definitely no help on microstrip
structures though.

Jerry Burke
LLNL

> I have never had the need to use the cliff option for NEC so do not
> know how this works. If the groundplane is treated as running
> continuously underneath the cliff, and the elevated area is treated
> as the dielectric, would this work provided height constraints in
> terms of wavelength are not violated?
>
> Duncan Baker.
Received on Sun Mar 28 1999 - 15:13:00 EST