Magnetic antenna system, patented by G. Wennerberg, is efficiently used as direction finding antenna. This magnetic system is an improved flush type magnetic antenna, suitable for mounting on an aircraft (it employs no moving parts).
The DFA actually consist of 2 coils wrapped around the magnetic material, but the two coils are winded in the orthogonal direction. The coupling between the two coils is especially important for the operation of the antenna.
MoM codes have been often challenged when the device under test is electrically moderate or small. The state-of-the-art MoM WIPL-D code can be used for electrically small structure efficiently, with extremely accurate and fast simulation. The smallest mesh element (0.2 mm large)represents approximately 1/8,000,000 fraction of lambda. No expensive hardware is needed, the simulation can be carried out at regular desktop PC or laptop. The simulation accuracy is extraordinary, showing the -60 dB levels for coupling between the two antenna ports.