Ring slot antenna

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The ring slot antenna is a special antenna design for fast fighters. It consists of a λ / 4 radiator with roof capacity, which was set back flush with the aircraft skin.

Creation of a ring slot antenna from a λ / 4 radiator

A λ / 4 radiator is considered as the starting point for the creation of a ring slot antenna. The radiator can be shortened considerably with the same resonance frequency (provided with a roof capacity ). This process can be implemented up to the complete retraction of the emitter length to the aircraft skin. The opening, which is filled with a dielectric, functions as a matching network. This antenna is fed via a coaxial cable.

Although this antenna design has a very small gain, it is aerodynamically more favorable than a λ / 4 radiator at high speeds. The ring slot antenna is therefore used for the transponders of the secondary radar in high-speed aircraft.