Abstract

In this paper, we proposed the new rectangular waveguide-NRD waveguide transition in which the transition function about the standard waveguide is built in within the NRD waveguide ifself. The newly proposed rectangular waveguide-NRD waveguide transition was realized use of NRD waveguide input/output side wall thickness and hole width. In the case of the wall thickness, it was nearly identical with the half of the NRD waveguide guide wavelength and the width of an hole was nearly coincide with the length of the long side of the standard waveguide connected with the NRD waveguide. This kind of the principles is applicable to be unrelated with the frequency band. In this paper, it made in 38 GHz band with the rectangular waveguide-NRD waveguide transition and the feasibility was confirmed. In the back-to-back structure, the rectangular waveguide-NRD waveguide transition manufactured in 38 GHz band has the insertion loss less than 0.4 dB and also has the return loss less than 20 dB.

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