CEM optimization of the HF antennas installations onboard the aircraft

A novel approach is considered for optimal installation of Notch-Fed (NF) and Shunt-Fed (SF) High Frequency (HF) slot-antennas onboard aircraft (a/c). A numerical experiment is employed while the a/c is illuminated by a plane wave incident from the direction of the proposed antenna´s desired radiation. This allows identifying the optimal position of the HF antenna by placing it in the areas of maximal induced current density to obtain desired radiation direction, for given polarization, and frequency. For the highest achievable radiation efficiency, the antenna slot must be positioned perpendicular to the surface current lines. In general, this proposed approach is applicable to all cases when the size of the a/c is comparable to a wavelength.