CST MICROWAVE STUDIO® (CST MWS) offers the facility to calculate the broadband radar cross-section (RCS) of arbitrary objects. The Time-Domain Solver in CST MWS can deliver the RCS results at arbitrary frequencies defined by the user - a tremendous advantage for RCS simulations. The ability of the time-domain solver to handle electrically large structures is also a major feature. The maximum dimension of the structure is about 10 wavelengths.
The geometry of the Almond is given in figure 1 with a plane wave excitation applied. The angle of incidence of the plane wave, the polarization of the field vector can be fully parameterized. The Almond is approximately 9.936 inches long and is defined as a Perfect Electrical Conductor (PEC). The dimensions of the Almond are given in equation form in References 1 and 2. These equations were used to create the geometry in CST MWS. ...
Figure 2 shows the comparsion between measured and simulated vertical component of RCS at 7 GHz.
Figure 3 shows the comparsion between measured and simulated horizontal component of RCS at 7 GHz.
In a similar manner, the results for the vertical component of RCS at 1.19 GHz are shown in figure 4.
Figures 5 and 6 show various field quatntites that can be extracted at any desired frequency from a single simulation run. In Figure 5, the electric fields on two orthogonal planes are superimposed. The surface current density is plotted in figure 6.
Figure 6: Surface Current distribution at 9.92 GHz
This article demonstrates the application of CST MWS to the broadband extraction of radar cross-section for electrically large structures. Just a single run is necessary for high resolution RCS data.