Rundstrahlantenne und Verfahren zu deren Herstellung

摘要

An omnidirectional antenna for the microwave range, in particular the millimetric wave range, contains a mode transformer in its feed and/or discharge line made up of rectangular and circular waveguides. The mode transformer transforms the basic mode in the rectangular waveguide of the feed and/or discharge line into a rotationally symmetrical mode for a first circular waveguide. In order to achieve a design as compact as possible, a second circular waveguide whose longitudinal axis coincides with that of the first circular waveguide is connected to the mode transformer. The second circular waveguide has several slots distributed around its outer surface for broadcasting and/or receiving electromagnetic waves. The end of the second circular waveguide away from the first circular waveguide is short-circuited.