A probe-fed, rectangular patch antenna on an infinite substrate backed by a ground plane, is modelled. The frequency response is first calculated, using FEKO's adaptive frequency sampling feature. From this result the resonant frequency follows as 2.8 GHz. The antenna is then analysed specifically at its resonant frequency, to obtain the current distribution and the radiation pattern. Below on the left, the input impedance as a function of frequency is displayed in both Cartesian format and Smith-chart format. On the right a POSTFEKO screenshot is shown, where the structure itself, the current distribution and the radiation pattern is being examined at resonance.

A Yagi-Uda wire antenna with one excitation element, three director elements, and one reflector element is considered. On the left, a POSTFEKO screenshot is shown, where the structure is displayed as well as the simulated input impedance response in the range 300 to 500 MHz. As can be observed, the input impedance is almost purely real at 400 MHz. On the right, the calculated current distribution and radiation pattern at 400 MHz is being examined.

A quarter-wavelength monopole mounted on a finite ground plane, of which the circular circumference is 3 wavelengths, is simulated. On the left, the geometry and solution set-up in CADFEKO is shown. On the right, a POSTFEKO screenshot is shown which includes a 2D far-field pattern cut, the current distribution on the structure, and a 3D radiation pattern visualisation.