Aviation Electronics

The demand for improved performance in modern aircraft has made the preservation of acrodynamically clean surfaces increasingly important. Projecting hf aerials can be eliminated by using, as a radiator, a notch let into part of the aircraft structure, the aero‐dynamic shape being preserved by the use of dielectric material. This notch may then be tuned to the required frequency and matched to the output of the transmitter by an aerial tuning unit.