一、概述在毫米波波段,介质波导更优于金属波导。已经提出许多种波导结构。虽然它们的工作模式都是表面波型,但在弯曲、接头等不均匀区不可避免地产生辐射损耗。最近提出的一种无辐射介质H波导(简称NRD波导),见图1,它可以抑制掉连续谱中的辐射模式,消除了辐射损耗。并且其工作模式是E_(11)~x型波,无金属板纵向电流,金属 I. Overview In the millimeter wave band, dielectric waveguide is better than the metal waveguide. Many kinds of waveguide structures have been proposed. Although their working modes are surface wave modes, radiation losses are inevitably generated in non-uniform regions such as flexures and joints. Recently proposed a non-radiative medium H waveguide (referred to as NRD waveguide), shown in Figure 1, it can suppress the continuous spectrum of radiation patterns, eliminating the radiation loss. And its working mode is E_ (11) ~ x type wave, no metal plate longitudinal current, metal