DISCONTINUITY OF NRD-GUIDE AND ITS APPLICATION IN MILLIMETER-WAVE CIRCUITS

In this paper, the performances of two typical discontinuous structure s of the NRD-guide, the traverse metallic rod to disturb an incident w ave and the traverse probe to excite required modes, are analyzed and computed by utilizing the theory of modes orthogonality of the NRD-gui de. The moment method is used to evaluate the current distribution on the rod and probe and the affection of some higher-order modes is take n into account simultaneously. On these bases, the multitone exciting steady states of two kinds of important circuits that employ the above discontinuous structures, the NRD-guide crossbar balanced mixer and t he LSM110 -mode oscillator, are simulated by the harmonic balance tech nique based on the multi-dimensional discrete Fourier transformation ( MDFT-HB method).