TE.sub.10 rectangular to TE.sub.01 circular waveguide mode launcher

摘要

The first section of a Marie'-configured TE.sub.10 rectangular mode to TE.sub.01 circular mode waveguide launcher is modified to provide an effectively true linear taper for the injected TE.sub.10 mode wave to the emitted TE.sub.20 mode wave. As a result, the first section is well matched at the low end of the frequency band as well as being resonance free to frequencies above the upper end of the band of interest. According to this modification, rather than have a single taper for the triangular shaped lower portion of the first section, the lower triangular portion has a second taper extending from the intersection at the lower wall of the input to the height of the exit wall at the output. This second taper provides an effective true linear taper for the input section. Thus, not only is there improved performance, in terms of electrical impedance matching and resonance free operation, but the input section is easier to machine, since there is no requirement of the insertion of formation of an internal impedance matching element.