Horn and Parabolic Antenna

Model

In this example a parabolic dish is positioned in front of the horn antenna. A thin metal coating is applied to the surface of the dish, different material parameters are applied to the sheet and the effects are recorded.

Simulation

Two different simulations are run to illustrate the effect of using different Thin Resistive Sheet coatings on the parabolic dish. In the first simulation, PEC coating for the parabolic dish is used. In the second simulation, the coating with 50 % transmission is applied. The Thin Resistive Sheet Calculation Tool can be used to estimate the reflection and transmission coefficients for a thin sheet. 

Results

To calculate the difference between the two field distributions, the Field Combiner Evaluation tool is used. The difference of the two distributions is clearly highest around the surface of the dish due to the difference in reflection properties of the two simulations. Also the difference is high behind the dish since for the PEC coating all the fields are reflected by the dish. The far-field radiation pattern for both simulations are also extracted.