周期金属栅加载非辐射介质波导传输特性的分析

Analysis of the Propagation Characteristics of NRD Waveguides Loaded with Periodic Metallic Strips

近年来,非辐射介质波导(NRD)传输特性、衰减特性、耦合特性和不连续性等的研究越来越受到人们的重视,并用之研制了滤波器、定向耦合器、振荡器和漏波天线等许多微波与毫米波元器件。现在人们正在为研制毫米波全NRD波导系统而努力。在研制NRD波导元部件的过程中,当遇到非对称不连续性时,由于LSE_(11)模的存在,元部件的指标将受到严重的影响。为了抑制LSE_(11)模的产生,在文[10]中使用了金属薄片,但是还未看到利用集成在NRD波导上的金属薄片构成微波与毫米波元件的报导。

In this paper the propagation characteristics of NRD waveguides loaded with periodic metallic strips are analyzed in terms of the Floquet's modes expansion technique. Numerical results show that such structures are most suitable for millimeter wave bandstop filters and NRD waveguide beam scanning leakage wave antennas application. This structure is also analyzed by the method of lines, and the results obtained from the two methods are in agreement.