ANALYSIS OF GROOVE NRD WAVE-GUIDE BEND USING THE COUPLED-MODE THEORY

In this paper, the propagation characteristics of the dominant mode in GNRD guide bend are analysed employing the coupled-mode theory. The curves of bending loss vs. the groove depth or width. radius of curvature and frequency are given, which caused by the mode conversion of the operating LSM11x mode to the parasitic LSE11x mode. It is found that the groove depth has a great influence upon the bending loss than the other parameters. According to the theoretical results, appropriate sizes of groove and radius of curvature should be chosen in designing a GNRD bend structure.