Ring-shaped directional coupler especially for microwave-based distance sensors

摘要

Annular directional coupler with at least three taps, which are each arranged by distances with a wavelength difference of ¼ of a wave guide wavelength to one another, characterized by at least two line branches, a first line branch having the at least three taps and the at least second line branch having no taps and is supplemented by an additional route (505, 515, 650, 665) corresponding to the wave guide wavelength.